CN117634265A - Cylinder cover unloading groove parameter determination method and related device - Google Patents
Cylinder cover unloading groove parameter determination method and related device Download PDFInfo
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Abstract
The application provides a cylinder cover unloading groove parameter determining method and a related device, wherein the method comprises the following steps: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove; and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements. According to the method, the target response surface calculation model is set, calculation is performed based on the size of the target area capable of being provided with the unloading groove in the cylinder cover, the target unloading groove parameters can be rapidly determined, and the research and development speed is improved.
Description
Technical Field
The application relates to the field of engines, in particular to a cylinder cover unloading groove parameter determining method and a related device.
Background
The cylinder cover of the engine is in a high-temperature and high-pressure working environment, so that cracks are easily generated due to fatigue damage, and faults such as water leakage, cylinder pulling and the like are caused, so that serious loss is caused. In order to improve the structural strength of the cylinder cover, an unloading groove is processed between two cylinders of the engine, so that the thermal stress of a bottom plate of the cylinder cover can be released to two sides, and the service life of the cylinder cover is prolonged.
In the prior art, although a technical personnel proposes a scheme for arranging the unloading groove, a specific design method of the unloading groove is not proposed. The size of the relief groove, including the length width and depth of the relief groove, is empirically set by the skilled artisan. If the dimensional design is not reasonable, the fatigue strength of the cylinder cover may not meet the product requirements. Or the dimension design can not reach the optimal level, so that the fatigue life of the cylinder cover is lower, and the crack risk is higher.
Disclosure of Invention
In view of the above, the application provides a cylinder cover unloading groove parameter determining method, a cylinder cover unloading groove parameter determining device and electronic equipment, wherein the method comprises the following steps:
a cylinder cover unloading groove parameter determining method comprises the following steps:
obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove;
and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements.
Optionally, in the above method, before determining the target unloading slot parameter according to the size parameter of the target area and the target response surface calculation model, the method further includes:
obtaining an initial response surface calculation model;
Determining the number of test parameter groups according to the initial response surface calculation model;
determining a test parameter set according to the size parameter of the target area and the test parameter set, wherein the test parameter set comprises at least four groups of test parameters, and any two groups of test parameters comprise different sizes of unloading grooves;
controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set, wherein the number of the simulation fatigue frequency in the simulation fatigue frequency set corresponds to the number of the test parameter sets in the test parameter set;
and determining a target response surface calculation model according to the simulation fatigue frequency set and the test parameter set.
Optionally, in the above method, the controlling the preset simulation model simulates the test parameters of the test parameter set, including:
setting cylinder cover simulation environment information, wherein the cylinder cover simulation environment information represents that the cylinder cover environment reaches boundary conditions;
and based on the cylinder cover simulation environment information, controlling the preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set.
Optionally, in the above method, the number of groups of test parameters in the test parameter set is greater than or equal to the number of undetermined coefficients, and determining the target response surface calculation model according to the simulated fatigue frequency set and the test parameter set includes:
According to a preset convergence rule, respectively calculating with an initial response surface calculation model according to test parameters in the test parameter set and the corresponding simulation fatigue frequency set to obtain a target coefficient;
and obtaining a target response surface calculation model according to the target coefficient and the initial response surface calculation model.
Optionally, the method further comprises:
controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
if the target simulation fatigue frequency is smaller than a preset threshold value and/or the target simulation fatigue frequency is smaller than any simulation fatigue frequency in the simulation fatigue frequency set, increasing the test parameter set, and returning to execute the step of determining the test parameter set according to the size parameter of the target area and the test parameter set.
Optionally, the method further comprises:
controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
if the target simulation fatigue times are smaller than a preset threshold value and/or the target simulation fatigue times are smaller than any simulation fatigue times in the simulation fatigue times set, updating an initial response surface calculation model, wherein the updated initial response surface calculation model is larger than the initial response surface calculation model before updating, and returning to execute the step of determining the test parameter set according to the initial response surface calculation model.
Optionally, in the above method, the obtaining the size parameter of the target area in the cylinder cover includes:
obtaining a first distance based on the first target bolt and the second target bolt positions, the first distance corresponding to the length of the unloading slot;
based on the positions of the sealing bands of the two cylinders on the cylinder cover gasket, obtaining a second distance, wherein the second distance corresponds to the width of the unloading groove;
based on the head thickness, a third distance is obtained, which corresponds to the depth dependence of the relief groove.
A cylinder head unloading groove parameter determination device, comprising:
the acquisition module is used for acquiring the size parameter of a target area in the cylinder cover, wherein the target area is an area capable of being provided with an unloading groove;
the determining module is used for determining a target unloading groove parameter according to the size parameter of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameter meet the preset requirement.
An electronic device, comprising:
a memory, a processor;
wherein the memory stores a processing program;
the processor is used for loading and executing the processing program stored in the memory so as to realize the steps of the cylinder cover unloading groove parameter determining method.
A readable storage medium having stored thereon a computer program which is invoked and executed by a processor to implement the steps of the cylinder head relief groove parameter determination method as set forth in any one of the preceding claims.
In summary, the present application provides a method for determining cylinder head unloading slot parameters and a related device, where the method includes: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove; and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements. In the embodiment, a target response surface calculation model is set, calculation is performed based on the size of a target area in the cylinder cover, in which the unloading groove can be arranged, the target unloading groove parameters can be rapidly determined, and the research and development speed is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present application, and that other drawings may be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of an embodiment 1 of a method for determining cylinder head unloading groove parameters;
fig. 2 is a flowchart of an embodiment 2 of a method for determining cylinder head unloading groove parameters;
FIG. 3 is a flowchart of an embodiment 3 of a method for determining cylinder head unloading groove parameters;
fig. 4 is a flowchart of an embodiment 4 of a method for determining cylinder head unloading groove parameters provided in the present application;
FIG. 5 is a flowchart of an embodiment 5 of a method for determining cylinder head unloading groove parameters;
FIG. 6 is a flowchart of an embodiment 6 of a method for determining cylinder head unloading groove parameters;
fig. 7 is a schematic diagram of a cylinder head in embodiment 6 of a method for determining parameters of a cylinder head unloading groove;
FIG. 8 is a schematic cross-sectional view of a cylinder head in example 6 of a method for determining cylinder head unloading groove parameters;
fig. 9 is a schematic structural diagram of an embodiment of a cylinder head unloading groove parameter determining device provided in the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
As shown in fig. 1, a flowchart of an embodiment 1 of a method for determining cylinder head unloading groove parameters is provided, and the method is applied to an electronic device, and includes the following steps:
step S101: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove;
wherein, the target area in the cylinder cover can be provided with an unloading groove.
And obtaining the size parameter of the target area in the cylinder cover.
Specifically, the target area is an area range in which unloading grooves are arranged in the cylinder cover and reasonable wall thickness is reserved between the unloading grooves and other structures of the cylinder cover.
For example, the depth of the target area needs to ensure that the relief groove and the internal water jacket, oil passage, etc. of the cylinder head are left with reasonable wall thickness.
The size parameters of the obtained target area will be described in detail in the following embodiments, which are not described in detail in this embodiment.
Step S102: and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements.
The electronic equipment is preset with a target response surface calculation model.
Wherein the size of the target area is an upper limit value of the length, width and height of the relief groove.
Correspondingly, based on the size parameter of the target area and the target response surface calculation model, analyzing and calculating to obtain the target unloading groove parameter based on the calculation model.
The fatigue times corresponding to the target unloading groove parameters meet preset requirements, and the preset requirements are specifically the maximum fatigue times determined by the target response surface calculation model.
The target response surface calculation model is a calculation formula model, analysis and calculation are carried out by adopting the calculation formula model, and a large number of tests can be rapidly carried out based on the size parameters of the target area.
Specifically, the response surface calculation model is determined by a selected proper optimization algorithm, specifically, optimization calculation is performed based on the optimization algorithm, the size parameter of the target area is taken as a boundary, iterative calculation is performed with the maximum fatigue frequency obtained by the response surface model as a target, and the required fatigue frequency meets the preset requirement.
Alternatively, the optimization algorithm may use a genetic algorithm.
And when the maximum fatigue times are determined, the corresponding target unloading groove parameters are the current optimal setting parameters.
Because the calculation process of the calculation formula model is fast relative to the speed of simulation, the target unloading groove parameter can be rapidly determined.
In summary, the method for determining the cylinder cover unloading groove parameters provided in the embodiment includes: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove; and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements. In the embodiment, a target response surface calculation model is set, calculation is performed based on the size of a target area in the cylinder cover, in which the unloading groove can be arranged, the target unloading groove parameters can be rapidly determined, and the research and development speed is improved.
As shown in fig. 2, a flowchart of an embodiment 2 of a method for determining cylinder head unloading groove parameters is provided, and the method includes the following steps:
step S201: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove;
step S201 is identical to the corresponding steps in embodiment 1, and is not described in detail in this embodiment.
Step S202: obtaining an initial response surface calculation model;
wherein, the technician selects an initial response surface calculation model according to actual conditions.
Wherein the initial response surface calculation model may be selected to be first order, or second order.
The process of obtaining the target response surface calculation model according to the determined parameters is described in this embodiment.
The initial response surface calculation model is designed by taking the length, the width and the depth of the unloading groove as factors and taking the fatigue strength of the cylinder cover as a target.
For example, the first order initial response surface calculation model is as follows:
wherein lambda represents fatigue strength of the cylinder cover, beta is a coefficient to be determined, K i Three factors, length L width W and height H, are shown, respectively.
Wherein, in the model, there are four undetermined coefficients, beta 0 、β 1 、β 2 And beta 3 。
Step S203: determining the number of test parameter groups according to the initial response surface calculation model;
and determining the number of the test parameter groups according to the number of the undetermined coefficients in the initial response surface calculation model.
In order to solve the undetermined coefficients in the initial response surface calculation model, a plurality of test parameters are required to be set.
For example, the pending coefficients are 4, at least 4 sets of test parameters need to be set.
Step S204: determining a test parameter set according to the size parameter of the target area and the test parameter set number;
the test parameter set comprises at least four groups of test parameters, and any two groups of test parameters comprise different sizes of unloading grooves.
Wherein, a set of test parameters includes three values of length, width and height of the relief groove.
The size parameter of the target area is an upper limit value of the length, the width and the height of the unloading groove in the set test parameters, and a plurality of groups of test parameters are selected within the upper limit value range.
And determining the test parameters of the corresponding groups within the size parameter range of the target area according to the test parameter groups determined in the previous steps, wherein the sizes of unloading grooves in each group of test parameters are different.
Step S205: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulated fatigue frequency set;
the number of the simulated fatigue times in the simulated fatigue times set corresponds to the number of the test parameter sets in the test parameter set.
The preset simulation model is a cylinder cover finite element model built in advance, and simulation of test parameters is achieved through the preset simulation model.
Specifically, the preset simulation model is controlled to simulate each group of test parameters to obtain the simulation fatigue times, and each simulation fatigue time combination is used for obtaining a simulation fatigue time set.
Wherein one simulated fatigue number corresponds to a set of test parameters.
Specifically, the step S205 includes:
step S2051: setting cylinder cover simulation environment information, wherein the cylinder cover simulation environment information represents that the cylinder cover environment reaches boundary conditions;
wherein the simulated environment information is an environment simulating the cylinder head when the engine is running.
Specifically, the actual running path spectrum of the transmitter is referred to and is brought into the boundary condition when the temperature of the cylinder cover is highest, wherein the boundary condition is the harsh working condition of the engine operation, and under the working condition, the thermal stress of the cylinder cover is the largest and the low cycle fatigue frequency is the smallest.
Step S2052: and based on the cylinder cover simulation environment information, controlling the preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set.
Based on the cylinder cover simulation environment, the simulation model is controlled to simulate all groups of test parameters in the test parameter set, so that the simulation under the severe working condition is realized.
Step S206: determining a target response surface calculation model according to the simulation fatigue frequency set and the test parameter set;
and based on the simulation fatigue frequency set obtained by simulation and the test parameter set, the two groups of data are brought into an initial response surface calculation model to obtain model coefficients, and a target response surface calculation model is determined.
If the number of the test parameter groups in the test parameter set is the same as the number of the model coefficients, the values of the coefficients can be directly calculated, and the coefficients are brought into the initial response surface calculation model to obtain the target response surface calculation model.
If the number of test parameter sets in the test parameter set is greater than the number of model coefficients, further processing is required to obtain a target response surface calculation model, which is described in detail in the following embodiment, and not described in detail in this embodiment.
Step S207: and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements.
Step S207 corresponds to the corresponding steps in embodiment 1, and is not described in detail in this embodiment.
In summary, the method for determining the cylinder cover unloading groove parameter provided in the embodiment further includes: obtaining an initial response surface calculation model; determining the number of test parameter groups according to the initial response surface calculation model; determining a test parameter set according to the size parameter of the target area and the test parameter set, wherein the test parameter set comprises at least four groups of test parameters, and any two groups of test parameters comprise different sizes of unloading grooves; controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set, wherein the number of the simulation fatigue frequency in the simulation fatigue frequency set corresponds to the number of the test parameter sets in the test parameter set; and determining a target response surface calculation model according to the simulation fatigue frequency set and the test parameter set. In this embodiment, based on the finite number of simulations performed on the test parameters, a simulated fatigue number set is obtained, and further, based on the simulated fatigue number set and the test parameter set, a target response surface calculation model can be determined by performing calculation, so that a process of determining the target response surface calculation model is clarified.
As shown in fig. 3, a flowchart of an embodiment 3 of a method for determining cylinder head unloading groove parameters is provided, and the method includes the following steps:
step S301: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove;
step S302: obtaining an initial response surface calculation model;
step S303: determining the number of test parameter groups according to the initial response surface calculation model;
step S304: determining a test parameter set according to the size parameter of the target area and the test parameter set number;
step S305: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulated fatigue frequency set;
steps S301-305 are identical to the corresponding steps in embodiment 2, and are not described in detail in this embodiment.
Step S306: according to a preset fitting rule, respectively calculating with an initial response surface calculation model according to test parameters in the test parameter set and the corresponding simulation fatigue frequency set to obtain a target coefficient;
the number of groups of test parameters in the test parameter set is greater than or equal to the number of undetermined coefficients in the initial response surface calculation model.
And substituting the test parameters serving as input values and corresponding simulation fatigue times serving as output values into the initial response surface calculation model to obtain a plurality of formulas containing the undetermined coefficients if the number of the groups of the test parameters is equal to the number of undetermined coefficients in the initial response surface calculation model, and calculating based on the formulas to obtain the values of the undetermined coefficients.
The number of the test parameters in the test parameter set is larger than the number of the undetermined coefficients in the initial response surface calculation model, a fitting rule is needed, a group of values of the undetermined coefficients are determined by combining the test parameters, the corresponding fatigue simulation times and the initial response surface calculation model, the values of the undetermined coefficients can enable the square sum of errors between the predicted fatigue times corresponding to each group of test parameters and the corresponding simulation fatigue times to be minimum, and the values of the undetermined coefficients are used as target coefficients.
For example, the initial response surface calculation model adopts a first-order formula, the test parameters are the length L, the width W and the height H of the unloading groove respectively, the corresponding simulation fatigue frequency is lambda, the data are brought into the initial response surface calculation model to obtain a plurality of groups of equations, and the plurality of groups of equations are solved to obtain the undetermined coefficient beta 0 、β 1 、β 2 And beta 3 Is a value of (a).
Step S307: obtaining a target response surface calculation model according to the target coefficient and the initial response surface calculation model;
and replacing the undetermined coefficient in the initial response surface calculation model with the target coefficient with the determined value to obtain a target response surface calculation model.
The predicted result of the target response surface calculation model can be close to the simulation result of the preset simulation model as much as possible, so that the predicted result of the target response surface calculation model is almost consistent with the simulation result, but the time required for calculation by adopting the target response surface calculation model is far less than the simulation time, and the time for determining the target unloading groove parameters is reduced.
Step S308: and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements.
Step S308 is identical to the corresponding steps in embodiment 2, and is not described in detail in this embodiment.
In summary, the method for determining the cylinder cover unloading groove parameters provided in the embodiment, where the number of groups of test parameters in the test parameter set is greater than or equal to the number of undetermined coefficients, includes: according to a preset convergence rule, respectively calculating with an initial response surface calculation model according to test parameters in the test parameter set and the corresponding simulation fatigue frequency set to obtain a target coefficient; and obtaining a target response surface calculation model according to the target coefficient and the initial response surface calculation model. In the embodiment, the target response surface calculation model can be obtained based on mathematical calculation, and the process is simple and easy to implement.
As shown in fig. 4, a flowchart of an embodiment 4 of a method for determining cylinder head unloading groove parameters is provided, and the method includes the following steps:
step S401: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove;
step S402: obtaining an initial response surface calculation model;
step S403: determining the number of test parameter groups according to the initial response surface calculation model;
step S404: determining a test parameter set according to the size parameter of the target area and the test parameter set number;
step S405: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulated fatigue frequency set;
step S406: determining a target response surface calculation model according to the simulation fatigue frequency set and the test parameter set;
step S407: determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model;
steps S401 to 407 are identical to the corresponding steps in embodiment 2, and are not described in detail in this embodiment.
Step S408: controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
After determining the target unloading slot parameter, because the prediction result of the target response surface calculation model may have a gap with the simulation result of the preset simulation model, in this embodiment, whether the target unloading slot parameter is the optimal parameter is further determined based on the preset simulation model.
Specifically, a preset simulation model is controlled to simulate the target unloading groove parameters, so that target simulation fatigue times are obtained.
The preset threshold value may be an empirical value, specifically, a set empirical fatigue frequency may be a lower limit of fatigue frequency of the cylinder head.
And comparing the target simulation fatigue times with a preset threshold value, wherein if the target simulation fatigue times are larger than the preset threshold value, the fatigue times which can be achieved by setting the target unloading groove parameters of the cylinder cover are larger than the lower limit of the fatigue times.
And comparing the target fatigue simulation times with each fatigue simulation times in the fatigue simulation times set in the previous step, and if the target fatigue simulation times are all larger than each fatigue simulation times in the fatigue simulation times set, determining that the target unloading groove parameters are currently optimal parameters.
Step S409: if the target simulation fatigue frequency is smaller than a preset threshold value and/or the target simulation fatigue frequency is smaller than any simulation fatigue frequency in the simulation fatigue frequency set, increasing the test parameter set;
And returns to step S404.
And if the target simulation fatigue times are smaller than the preset threshold value, characterizing that the fatigue times reached by setting the unloading groove parameters of the cylinder cover are smaller than the lower limit of the fatigue times, and characterizing that the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.
If the target fatigue simulation times are smaller than any fatigue simulation times in the fatigue simulation times set, the fatigue times which are achieved by setting the unloading groove parameters of the cylinder cover are represented to be not maximum, and the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.
Specifically, if the target unloading slot parameter calculated by the target response surface calculation model is not the optimal parameter, the error of the target response surface calculation model is larger, and the target response surface calculation model needs to be further optimized.
Specifically, the number of test parameter sets is increased so as to reduce the error between the target response surface calculation model and the preset simulation model.
Specifically, reference may be made to the process in the foregoing embodiment 4 to reduce the error between the target response surface calculation model and the preset simulation model, which is not described in detail in this embodiment.
In summary, the method for determining the cylinder cover unloading groove parameter provided in the embodiment further includes: controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times; if the target simulation fatigue frequency is smaller than a preset threshold value and/or the target simulation fatigue frequency is smaller than any simulation fatigue frequency in the simulation fatigue frequency set, increasing the test parameter set, and returning to execute the step of determining the test parameter set according to the size parameter of the target area and the test parameter set. In this embodiment, the target unloading slot parameter is further controlled to be simulated by the preset simulation model, the prediction accuracy of the target response surface calculation model is determined, if the target simulation fatigue frequency of the target unloading slot parameter is smaller than a preset threshold value and/or smaller than any fatigue frequency in the simulation fatigue frequency set, the prediction accuracy of the target response surface calculation model is determined to be lower, the target unloading slot parameter is not the optimal position, and the parameter optimization is performed on the target response surface calculation model, so that the target unloading slot parameter is determined based on the optimized target response surface calculation model, and the accuracy of the prediction result is improved.
As shown in fig. 5, a flowchart of an embodiment 5 of a method for determining cylinder head unloading groove parameters is provided, and the method includes the following steps:
step S501: obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove;
step S502: obtaining an initial response surface calculation model;
step S503: determining the number of test parameter groups according to the initial response surface calculation model;
step S504: determining a test parameter set according to the size parameter of the target area and the test parameter set number;
step S505: controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulated fatigue frequency set;
step S506: determining a target response surface calculation model according to the simulation fatigue frequency set and the test parameter set;
step S507: determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model;
steps S501-507 are identical to the corresponding steps in embodiment 2, and are not described in detail in this embodiment.
Step S508: controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
For the explanation of step S508, please refer to the corresponding steps in embodiment 4, which is not described in detail in this embodiment.
Step S509: if the target simulation fatigue times are smaller than a preset threshold value and/or the target simulation fatigue times are smaller than any simulation fatigue times in the simulation fatigue times set, updating the initial response surface calculation model, wherein the order of the updated initial response surface calculation model is larger than that of the initial response surface calculation model before updating;
and returns to step S503.
And if the target simulation fatigue times are smaller than the preset threshold value, characterizing that the fatigue times reached by setting the unloading groove parameters of the cylinder cover are smaller than the lower limit of the fatigue times, and characterizing that the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.
If the target fatigue simulation times are smaller than any fatigue simulation times in the fatigue simulation times set, the fatigue times which are achieved by setting the unloading groove parameters of the cylinder cover are represented to be not maximum, and the target unloading groove parameters calculated by the target response surface calculation model are not optimal parameters.
Specifically, if the target unloading slot parameter calculated by the target response surface calculation model is not the optimal parameter, the error of the target response surface calculation model is larger, and the target response surface calculation model needs to be further optimized.
Specifically, the initial response surface calculation model is updated, the order of the calculation model is increased, and therefore errors between the target response surface calculation model and a preset simulation model are reduced.
The higher the order of the calculation model, the more the coefficient to be determined is involved, so that the more the required test parameter groups are, the more the simulation times are correspondingly, the more the calculation times are, and the more the response surface calculation model is accurate.
For example, the first order initial response surface calculation model is updated to the second order initial response surface calculation model.
The second order initial response surface calculation model is as follows:
wherein lambda represents fatigue strength of the cylinder cover, beta is a coefficient to be determined, K i And K j Three factors, length L width W and height H, are shown, respectively.
Wherein, in the model, there are 10 undetermined coefficients, respectively beta 0 、β 1 、β 2 、β 3 、β 11 、β 12 、β 13 、β 22 、β 23 、β 33 。
After determining the high-order initial response surface calculation model, the method returns to step S602 to determine the coefficient of the high-order initial response surface calculation model, and further determine a new target response surface calculation model, so as to reduce the error between the target response surface calculation model and a preset simulation model.
In summary, the method for determining the cylinder cover unloading groove parameter provided in the embodiment further includes: controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times; if the target simulation fatigue times are smaller than a preset threshold value and/or the target simulation fatigue times are smaller than any simulation fatigue times in the simulation fatigue times set, updating an initial response surface calculation model, wherein the updated initial response surface calculation model is larger than the initial response surface calculation model before updating, and returning to execute the step of determining the test parameter set according to the initial response surface calculation model. In this embodiment, the target unloading slot parameter is further controlled to simulate a preset simulation model, the prediction accuracy of the target response surface calculation model is determined, if the target simulation fatigue frequency of the target unloading slot parameter is smaller than a preset threshold value and/or smaller than any fatigue frequency in a simulation fatigue frequency set, the prediction accuracy of the target response surface calculation model is determined to be lower, the target unloading slot parameter is not the optimal position, a higher-order initial response surface model is selected, and the parameters of the initial response surface model are redetermined, so that the response surface model is optimized, and the target unloading slot parameter is determined based on the optimized response surface model, so that the accuracy of a prediction result is improved.
As shown in fig. 6, a flowchart of an embodiment 6 of a method for determining cylinder head unloading groove parameters is provided, and the method includes the following steps:
step S601: obtaining a first distance based on the first target bolt and the second target bolt positions, the first distance corresponding to the length of the unloading slot;
the size parameters of the target area of the cylinder cover are determined based on the sizes of all structures on the cylinder cover.
Wherein, be provided with two bolts respectively in the inlet opening position and the apopore position inboard of cylinder cap, first target bolt and second target bolt.
In particular, based on the positions of the first target bolt and the second target bolt, a first distance is obtained, which is in particular the distance between the two target bolts, from which the necessary reasonable wall thickness is removed.
Wherein the first distance corresponds to an unloading slot length, and the test unloading slot length is selected within the first distance range when the test parameters are subsequently determined.
Specifically, a plurality of values of the length of the relief groove may be sequentially selected according to a set first gradient.
Step S602: based on the positions of the sealing bands of the two cylinders on the cylinder cover gasket, obtaining a second distance, wherein the second distance corresponds to the width of the unloading groove;
Wherein a second distance is obtained between the two cylinder sealing bands on the head gasket, which second distance is in particular a distance between the two cylinder sealing bands on the head gasket, from which a necessary reasonable wall thickness is removed.
Wherein the second distance corresponds to an off-take slot width, and the test off-take slot width is selected within the second distance range when the test parameters are subsequently determined.
Specifically, a plurality of relief groove width values may be sequentially selected according to the set second gradient.
Step S603: obtaining a third distance based on the cylinder head thickness, the third distance corresponding to a depth dependence of the relief groove;
wherein, the cylinder cover thickness is the upper limit of the unloading groove depth, and the unloading groove depth can not exceed the cylinder cover thickness.
Specifically, the depth of the unloading groove is related to the processing technology, and the larger the width is, the larger the processing depth is, and the deepest unloading groove and the inner water jacket, oil duct and the like of the cylinder cover are ensured to be provided with reasonable wall thickness.
Fig. 7 is a bottom view of the cylinder head, fig. 8 is a cross-sectional view taken along section A-A of fig. 7, and fig. 7 and 8 are combined, the cylinder head comprising: the cylinder cover 1, the cylinder cover bottom surface 2, the exhaust valve hole 3, the intake valve hole 4, the spark plug hole 5, the cylinder cover bolt hole 6, the nose bridge area 7, the cylinder cover water inlet hole 8, the cylinder cover water outlet hole 9, the cylinder cover oil return hole 10 and the inter-cylinder unloading groove 11. Wherein L represents the length of the unloading groove, W represents the width of the unloading groove, and H represents the depth of the unloading groove.
The cylinder cover 1, the engine body and the piston form a combustion chamber of the engine, and high-temperature and high-pressure gas is generated by gas combustion in the combustion chamber and acts on the bottom surface 2 of the cylinder cover, so that larger thermal stress is generated on the bottom surface of the cylinder cover. The bottom surface 2 of the cylinder cover is provided with an exhaust valve hole 3 and an intake valve hole 4 which are respectively connected with an exhaust passage and an air inlet passage of the cylinder cover. A spark plug hole 5 is provided in the middle of the exhaust valve hole 3 and the intake valve hole 4 for mounting a spark plug. The existence of the exhaust valve hole 3, the intake valve hole 4 and the spark plug hole 5 makes the rigidity of each part of the bottom surface of the cylinder cover different. When the head bottom surface 2 is deformed by heat, stress concentration is easily generated at the middle connecting position of each valve hole, that is, the nose bridge region 7. If the stress is not released effectively, fatigue cracks are liable to occur. The outside of each valve hole has a plurality of cylinder cap bolt holes 6, and cylinder cap bolts pass cylinder cap bolt holes 6 and connect cylinder cap 1 with the organism. In order to reduce the temperature of the bottom surface 2 of the cylinder cover, a cylinder cover water inlet hole 8 and a cylinder cover water outlet hole 9 are also arranged on the cylinder cover 1, and cooling water flows in the cylinder cover 1 through the water holes to cool the cylinder cover. The outside of the cylinder cover is also provided with a cylinder cover oil return hole 10, and engine oil in the cylinder cover flows back to an engine oil pan through the cylinder cover oil return hole 10. An inter-cylinder unloading groove 11 is arranged in the middle connecting area of each cylinder of the cylinder cover, and the thermal stress of the nose bridge area 7 is released through deformation of the inter-cylinder unloading groove 11, so that the risk of cylinder cover cracking is reduced.
Step S604: and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements.
Step S704 is identical to the corresponding steps in embodiment 1, and will not be described in detail in this embodiment.
In summary, the method for determining the cylinder cover unloading groove parameters provided in the embodiment includes: obtaining a first distance based on the first target bolt and the second target bolt positions, the first distance corresponding to the length of the unloading slot; based on the positions of the sealing bands of the two cylinders on the cylinder cover gasket, obtaining a second distance, wherein the second distance corresponds to the width of the unloading groove; based on the head thickness, a third distance is obtained, which corresponds to the depth dependence of the relief groove. In the embodiment, the target area parameter in the cylinder cover is determined according to the specific structure of the cylinder cover, and a basis is provided for calculating the target unloading groove parameter by a subsequent target response surface calculation model.
Corresponding to the embodiment of the method for determining the cylinder cover unloading groove parameters provided by the application, the application also provides an embodiment of a device applying the method for determining the cylinder cover unloading groove parameters.
Fig. 9 is a schematic structural diagram of an embodiment of a cylinder head unloading groove parameter determining device provided in the present application, where the device includes the following structures: an acquisition module 901 and a determination module 902;
the obtaining module 901 is configured to obtain a size parameter of a target area in the cylinder head, where the target area is an area where an unloading groove can be set;
the determining module 902 is configured to determine a target unloading groove parameter according to the size parameter of the target area and the target response surface calculation model, where the fatigue number corresponding to the target unloading groove parameter meets a preset requirement.
Optionally, before the target unloading groove parameter is obtained according to the size parameter of the target area and the preset response surface calculation model, the method further includes:
the model obtaining module is used for obtaining an initial response surface calculation model;
the group number determining module is used for determining the number of test parameter groups according to the initial response surface calculation model;
the test parameter determining module is used for determining a test parameter set according to the size parameter of the target area and the test parameter set, wherein the test parameter set comprises at least four groups of test parameters, and any two groups of test parameters comprise different sizes of unloading grooves;
The control module is used for controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set, and the number of the simulation fatigue frequency in the simulation fatigue frequency set corresponds to the number of the test parameter sets in the test parameter set;
and the model determining module is used for determining a target response surface calculation model according to the simulation fatigue frequency set and the test parameter set.
Optionally, the control module is specifically configured to:
setting cylinder cover simulation environment information, wherein the cylinder cover simulation environment information represents that the cylinder cover environment reaches boundary conditions;
and based on the cylinder cover simulation environment information, controlling the preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set.
Optionally, the model determining module is configured to:
obtaining a first coefficient according to the simulation fatigue frequency set, the test parameter set and the initial response surface calculation model;
and obtaining a target response surface calculation model according to the first coefficient and the initial response surface calculation model.
Optionally, the model determining module is further configured to:
based on the number of groups of test parameters in the test parameter set being greater than the number of first coefficients, obtaining a predicted fatigue frequency set according to the test parameters in the test parameter set and the target response surface calculation model;
Obtaining a second coefficient according to the predicted fatigue frequency set and the simulated fatigue frequency set;
updating a first coefficient of the target response surface calculation model based on the second coefficient.
Optionally, the control module is further configured to:
controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
if the target simulation fatigue frequency is smaller than a preset threshold value and/or the target simulation fatigue frequency is smaller than any simulation fatigue frequency in the simulation fatigue frequency set, increasing the test parameter set number, and returning to the trigger test parameter determining module.
Optionally, the control module is further configured to:
controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
if the target simulation fatigue times are smaller than a preset threshold value and/or the target simulation fatigue times are smaller than any simulation fatigue times in the simulation fatigue times set, updating the initial response surface calculation model, wherein the updated initial response surface calculation model is larger than the initial response surface calculation model before updating, and returning to the trigger group number determining module.
Optionally, the obtaining module is specifically configured to:
Obtaining a first distance based on the first target bolt and the second target bolt positions, the first distance corresponding to the length of the unloading slot;
based on the positions of the sealing bands of the two cylinders on the cylinder cover gasket, obtaining a second distance, wherein the second distance corresponds to the width of the unloading groove;
based on the head thickness, a third distance is obtained, which corresponds to the depth dependence of the relief groove.
It should be noted that, for the functional explanation of each component structure in the embodiment of the cylinder head unloading groove parameter determining device provided in the present embodiment, reference is made to the explanation in the foregoing method embodiment, and details are not repeated in the present embodiment.
To sum up, the cylinder cover unloading groove parameter determining device provided in this embodiment includes: the acquisition module is used for acquiring the size parameter of a target area in the cylinder cover, wherein the target area is an area capable of being provided with an unloading groove; the determining module is used for determining a target unloading groove parameter according to the size parameter of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameter meet the preset requirement. In the embodiment, a target response surface calculation model is set, calculation is performed based on the size of a target area in the cylinder cover, in which the unloading groove can be arranged, the target unloading groove parameters can be rapidly determined, and the research and development speed is improved.
Corresponding to the embodiment of the cylinder cover unloading groove parameter determining method provided by the application, the application also provides electronic equipment and a readable storage medium corresponding to the cylinder cover unloading groove parameter determining method.
Wherein, this electronic equipment includes: a memory, a processor;
wherein the memory stores a processing program;
the processor is used for loading and executing the processing program stored in the memory so as to realize the steps of the cylinder cover unloading groove parameter determining method.
The method for determining the cylinder cover unloading groove parameters of the electronic equipment is achieved by referring to the embodiment of the method for determining the cylinder cover unloading groove parameters.
Wherein the readable storage medium has stored thereon a computer program, which is invoked and executed by a processor, to implement the steps of the cylinder head unloading groove parameter determination method as set forth in any one of the above.
The method for determining the cylinder cover unloading groove parameters is implemented by executing a computer program stored in the readable storage medium, and the embodiment of the method for determining the cylinder cover unloading groove parameters is referred to.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. The device provided in the embodiment corresponds to the method provided in the embodiment, so that the description is simpler, and the relevant points refer to the description of the method.
The previous description of the provided embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features provided herein.
Claims (10)
1. The cylinder cover unloading groove parameter determining method is characterized by comprising the following steps of:
obtaining a size parameter of a target area in a cylinder cover, wherein the target area is an area capable of setting an unloading groove;
and determining a target unloading groove parameter according to the size parameter of the target area and a target response surface calculation model, wherein the fatigue times corresponding to the target unloading groove parameter meet preset requirements.
2. The method for determining the cylinder head unloading groove parameter according to claim 1, wherein before determining the target unloading groove parameter according to the size parameter of the target area and the target response surface calculation model, further comprises:
Obtaining an initial response surface calculation model;
determining the number of test parameter groups according to the initial response surface calculation model;
determining a test parameter set according to the size parameter of the target area and the test parameter set, wherein the test parameter set comprises at least four groups of test parameters, and any two groups of test parameters comprise different sizes of unloading grooves;
controlling a preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set, wherein the number of the simulation fatigue frequency in the simulation fatigue frequency set corresponds to the number of the test parameter sets in the test parameter set;
and determining a target response surface calculation model according to the simulation fatigue frequency set and the test parameter set.
3. The cylinder head unloading groove parameter determining method according to claim 2, wherein the controlling the preset simulation model simulates the test parameters of the test parameter set, including:
setting cylinder cover simulation environment information, wherein the cylinder cover simulation environment information represents that the cylinder cover environment reaches boundary conditions;
and based on the cylinder cover simulation environment information, controlling the preset simulation model to simulate the test parameters of the test parameter set to obtain a simulation fatigue frequency set.
4. The method for determining cylinder head unloading groove parameters according to claim 2, wherein the number of groups of test parameters in the test parameter set is greater than or equal to the number of coefficients to be determined, and determining the target response surface calculation model according to the simulated fatigue frequency set and the test parameter set comprises:
according to a preset fitting rule, respectively calculating with an initial response surface calculation model according to test parameters in the test parameter set and the corresponding simulation fatigue frequency set to obtain a target coefficient;
and obtaining a target response surface calculation model according to the target coefficient and the initial response surface calculation model.
5. The cylinder head unloading groove parameter determination method according to claim 2, further comprising:
controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
if the target simulation fatigue frequency is smaller than a preset threshold value and/or the target simulation fatigue frequency is smaller than any simulation fatigue frequency in the simulation fatigue frequency set, increasing the test parameter set, and returning to execute the step of determining the test parameter set according to the size parameter of the target area and the test parameter set.
6. The cylinder head unloading groove parameter determination method according to claim 2, further comprising:
controlling a preset simulation model to simulate the target unloading groove parameters to obtain target simulation fatigue times;
if the target simulation fatigue times are smaller than a preset threshold value and/or the target simulation fatigue times are smaller than any simulation fatigue times in the simulation fatigue times set, updating an initial response surface calculation model, wherein the updated initial response surface calculation model is larger than the initial response surface calculation model before updating, and returning to execute the step of determining the test parameter set according to the initial response surface calculation model.
7. The cylinder head unloading groove parameter determination method according to claim 1, wherein the obtaining the size parameter of the target area in the cylinder head includes:
obtaining a first distance based on the first target bolt and the second target bolt positions, the first distance corresponding to the length of the unloading slot;
based on the positions of the sealing bands of the two cylinders on the cylinder cover gasket, obtaining a second distance, wherein the second distance corresponds to the width of the unloading groove;
based on the head thickness, a third distance is obtained, which corresponds to the depth dependence of the relief groove.
8. The cylinder cover unloading groove parameter determining device is characterized by comprising:
the acquisition module is used for acquiring the size parameter of a target area in the cylinder cover, wherein the target area is an area capable of being provided with an unloading groove;
the determining module is used for determining a target unloading groove parameter according to the size parameter of the target area and the target response surface calculation model, and the fatigue times corresponding to the target unloading groove parameter meet the preset requirement.
9. An electronic device, comprising:
a memory, a processor;
wherein the memory stores a processing program;
the processor is configured to load and execute the processing program stored in the memory, so as to implement the steps of the cylinder head unloading groove parameter determining method according to any one of claims 1 to 7.
10. A readable storage medium, having stored thereon a computer program, the computer program being invoked and executed by a processor, implementing the steps of the cylinder head relief groove parameter determination method according to any one of claims 1-7.
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