CN117574707A - Method, system, electronic equipment and medium for accelerating jitter analysis of exhaust system - Google Patents
Method, system, electronic equipment and medium for accelerating jitter analysis of exhaust system Download PDFInfo
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Abstract
The invention relates to an acceleration jitter analysis method, a system, electronic equipment and a medium of an exhaust system, which are characterized in that a target finite element model established based on the target exhaust system is firstly obtained, then preset acceleration excitation data is obtained, excitation is applied to the target finite element model based on the preset acceleration excitation data, forced vibration analysis is carried out on the target finite element model after the excitation is applied to obtain an acceleration response result, and finally the acceleration response result is analyzed to obtain the acceleration jitter analysis result of the target exhaust system. Compared with the prior art, the method and the device construct the target finite element model through the target exhaust system model, the power train model and the BIP car body model, so that the subsequent analysis can simulate the real situation most, and after simulation excitation, the acceleration shaking state of the abstract exhaust system is represented through a specific acceleration response result, and the analysis of the acceleration shaking of the exhaust system is perfectly and accurately realized.
Description
Technical Field
The invention relates to the technical field of vehicle system analysis, in particular to an exhaust system acceleration shake analysis method, an exhaust system acceleration shake analysis system, electronic equipment and a medium.
Background
In vehicle design and manufacture, jitter analysis is important because it can discover and solve potential problems ahead of time, reducing damage and malfunctions that may occur in a vehicle in service. Especially for vehicles traveling at high speeds, the problem of shake is more likely to cause safety hazards.
The existing technology adopts a modal analysis method to analyze the exhaust system, and the method mainly avoids the idling frequency of the engine through the natural frequency to solve the problem of shaking, but the method has poor effect on the problem of accelerating shaking of the exhaust system, and cannot effectively solve the problem.
The acceleration jitter analysis of the vehicle exhaust system can provide more accurate data support for automobile manufacturers, help to improve design and manufacturing processes, and can also improve vehicle performance and driving experience, thereby providing safer and more reliable vehicles for consumers. Therefore, a method of analyzing acceleration jitter of an exhaust system is needed.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an exhaust system acceleration jitter analysis method, system, electronic device and medium for solving the problem of how to analyze the exhaust system acceleration jitter.
In order to achieve the technical purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides an exhaust system acceleration shake analysis method, including:
acquiring a target finite element model established based on a target exhaust system, wherein the target finite element model comprises a target exhaust system model corresponding to the target exhaust system, and a power train model and a BIP vehicle body model which are assembled and connected with the target exhaust system model;
acquiring preset acceleration excitation data;
applying excitation to the target finite element model based on the preset acceleration excitation data, and performing forced vibration analysis on the target finite element model subjected to the excitation to obtain an acceleration response result;
and analyzing the acceleration response result to obtain an acceleration shaking analysis result of the target exhaust system.
Further, the preset acceleration excitation data includes engine excitation data; the acquiring the preset acceleration excitation data comprises the following steps:
acquiring engine cylinder pressure test data, engine rotating speed test data, cylinder vibration acceleration test data and engine test parameter data corresponding to an engine in the power assembly system model;
and obtaining the engine excitation data according to the engine cylinder pressure test data, the engine rotating speed test data, the cylinder vibration acceleration test data and the engine test parameter data.
Further, the preset acceleration excitation data further comprises exhaust gas flow excitation data; the acquiring the preset acceleration excitation data further comprises:
acquiring the target exhaust system model, and defining finite element grid attributes based on the target exhaust system model based on preset attribute parameters;
defining a vibration boundary condition of an inlet end of the target exhaust system model and a sound absorption attribute of an outlet end of the target exhaust system model based on a preset inlet end parameter and a preset outlet end parameter;
and carrying out sound field distribution calculation on the target exhaust system model based on the finite element grid attribute, the vibration boundary condition and the sound absorption attribute to obtain the exhaust airflow excitation data.
Further, the step of applying excitation to the target finite element model based on the preset acceleration excitation data, and performing forced vibration analysis on the target finite element model after the excitation is applied to obtain an acceleration response result, includes:
setting an engine excitation point in the powertrain model and an exhaust excitation point in the target exhaust system model;
applying excitation to the powertrain model according to the engine excitation data based on the engine excitation point, applying excitation to the target exhaust system model according to the exhaust gas flow excitation data based on the exhaust excitation point;
setting a response point in the target finite element model, and setting a response frequency and a modal solving frequency;
and based on the response frequency and the modal solving frequency, carrying out forced vibration analysis on the target finite element model after excitation is applied to obtain acceleration response data of the response point, and obtaining the acceleration response result according to the acceleration response data.
Further, the engine excitation data includes a reciprocating inertial force excitation profile and a torque excitation profile; the target exhaust system model comprises an exhaust hook model, and the response point is a connection point of the exhaust hook model and the BIP car body model; the modal solution frequency is at least 1.5 times the response frequency.
Further, the acceleration response result is a numerical value characterizing a statistical feature of the acceleration response data; the step of analyzing the acceleration response result to obtain an acceleration shake analysis result of the target exhaust system includes:
comparing the acceleration response result with a preset threshold value;
if the acceleration response result is greater than or equal to a preset threshold value, an acceleration jitter analysis result that the target exhaust system has jitter risk in an acceleration state is obtained;
and if the acceleration response result is smaller than a preset threshold value, obtaining an acceleration jitter analysis result that the target exhaust system does not have jitter risk in an acceleration state.
Further, the target finite element model adopts a second order tetrahedron unit as an entity unit; the target exhaust system model comprises an exhaust lifting lug model, wherein the exhaust lifting lug model is simulated by a CBUSH spring unit and is endowed with actually measured six-directional rigidity, and the exhaust lifting lug model is assembled and connected with the BIP car body model; the power train model comprises an engine model and an engine suspension model, wherein the engine model is simulated by adopting a concentrated mass CONM2 unit and is connected with the engine suspension model through an RBE2 rigid unit, the engine suspension model is simulated by adopting a CBUSH spring unit and is endowed with the six-direction rigidity of actual measurement, one end of the engine suspension model is connected with the engine model, and the other end of the engine suspension model is connected with the BIP car body model in an assembling way.
In a second aspect, the present invention also provides an exhaust system acceleration shake analysis system, including:
the model input module is used for acquiring a target finite element model established based on a target exhaust system, wherein the target finite element model comprises a target exhaust system model corresponding to the target exhaust system, and a power assembly system model and a BIP vehicle body model which are assembled and connected with the target exhaust system model;
the excitation input module is used for acquiring preset acceleration excitation data;
the excitation simulation module is used for applying excitation to the target finite element model based on the preset acceleration excitation data, and carrying out forced vibration analysis on the target finite element model after the excitation is applied to obtain an acceleration response result;
and the response analysis module is used for analyzing the acceleration response result to obtain an acceleration jitter analysis result of the target exhaust system.
In a third aspect, the invention also provides an electronic device comprising a memory and a processor, wherein,
a memory for storing a program;
and a processor coupled to the memory for executing the program stored in the memory to implement the steps in the exhaust system acceleration shake analysis method in any one of the implementations described above.
In a fourth aspect, the present invention further provides a computer readable storage medium storing a computer readable program or instructions, which when executed by a processor, enable implementation of the steps in the exhaust system acceleration shake analysis method in any one of the above implementations.
The invention provides an acceleration jitter analysis method, a system, electronic equipment and a medium of an exhaust system, which are characterized in that a target finite element model established based on the target exhaust system is firstly obtained, then preset acceleration excitation data is obtained, excitation is applied to the target finite element model based on the preset acceleration excitation data, forced vibration analysis is carried out on the target finite element model after the excitation is applied to obtain an acceleration response result, and finally the acceleration response result is analyzed to obtain the acceleration jitter analysis result of the target exhaust system. Compared with the prior art, the method and the device construct the target finite element model through the target exhaust system model, the power train model and the BIP car body model, so that the subsequent analysis can simulate the real situation most, and after simulation excitation, the acceleration shaking state of the abstract exhaust system is represented through the specific acceleration response result, and the analysis of the acceleration shaking of the exhaust system is perfectly and accurately realized.
Drawings
FIG. 1 is a flow chart of an embodiment of an analysis method for accelerating jitter of an exhaust system according to the present invention;
FIG. 2 is a schematic diagram of an embodiment of an exhaust system acceleration jitter analysis system according to the present invention;
fig. 3 is a schematic structural diagram of an embodiment of an electronic device according to the present invention.
Detailed Description
Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form a part hereof, and together with the description serve to explain the principles of the invention, and are not intended to limit the scope of the invention.
Acceleration dithering: when the engine is in an acceleration working state, the NVH phenomenon of the system caused by the exciting force of the engine and the exciting force of exhaust gas flow represents the most basic NVH characteristic of the automobile. The explosion pressure, unbalanced inertia force and exhaust gas flow of the engine cause vibration of the exhaust system, and the vibration is transmitted to the vehicle body through the exhaust hook, and the caused vibration of the vehicle body is called acceleration shake.
It is to be understood that technical terms, acronyms, and the like appearing hereinafter are prior art and those skilled in the art are able to understand their meanings based on context and are not described here too much for reasons of brevity.
In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the invention. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The invention provides an exhaust system acceleration jitter analysis method, an exhaust system acceleration jitter analysis device, exhaust system acceleration jitter analysis equipment and a storage medium, which are respectively described below.
Referring to fig. 1, in one embodiment of the present invention, an exhaust system acceleration jitter analysis method is disclosed, including:
s101, acquiring a target finite element model established based on a target exhaust system, wherein the target finite element model comprises a target exhaust system model corresponding to the target exhaust system, and a power train model and a BIP vehicle body model which are assembled and connected with the target exhaust system model;
s102, acquiring preset acceleration excitation data;
s103, applying excitation to the target finite element model based on the preset acceleration excitation data, and performing forced vibration analysis on the target finite element model subjected to the excitation to obtain an acceleration response result;
s104, analyzing the acceleration response result to obtain an acceleration jitter analysis result of the target exhaust system.
Compared with the prior art, the method and the device construct the target finite element model through the target exhaust system model, the power train model and the BIP car body model, so that the subsequent analysis can simulate the real situation most, and after simulation excitation, the acceleration shaking state of the abstract exhaust system is represented through the specific acceleration response result, and the analysis of the acceleration shaking of the exhaust system is perfectly and accurately realized.
Specifically, in a preferred embodiment, the target finite element model in step S101 employs a second order tetrahedral unit as a solid unit; the target exhaust system model comprises an exhaust lifting lug model, wherein the exhaust lifting lug model is simulated by a CBUSH spring unit and is endowed with actually measured six-directional rigidity, and the exhaust lifting lug model is assembled and connected with the BIP car body model; the power train model comprises an engine model and an engine suspension model, wherein the engine model is simulated by adopting a concentrated mass CONM2 unit and is connected with the engine suspension model through an RBE2 rigid unit, the engine suspension model is simulated by adopting a CBUSH spring unit and is endowed with the six-direction rigidity of actual measurement, one end of the engine suspension model is connected with the engine model, and the other end of the engine suspension model is connected with the BIP car body model in an assembling way.
In the embodiment, the second order tetrahedron unit is used as the entity unit, so that the target finite element model can be more accurately simulated, and the accuracy and reliability of the model are improved. The exhaust lifting lug model and the engine suspension model are simulated by using CBUSH spring units and are endowed with the six-way rigidity which is actually measured. The simulation method considers the stiffness characteristics of the system in multiple directions, and can more accurately simulate and predict the dynamic response and vibration characteristics of the exhaust system and the engine in the running process. The exhaust lifting lug model, the engine suspension model and the BIP car body model are assembled and connected, and the RBE2 rigid unit and the CBUSH spring unit are adopted for connection, so that the rigid connection between the models can be ensured, the possibility of vibration and instability is reduced, and the simulation accuracy is improved.
Further, in a preferred embodiment, the preset acceleration excitation data includes engine excitation data for simulating an excitation force of the engine. In this embodiment, step S102, the acquiring the preset acceleration excitation data specifically includes:
acquiring engine cylinder pressure test data, engine rotating speed test data, cylinder vibration acceleration test data and engine test parameter data corresponding to an engine in the power assembly system model;
and obtaining the engine excitation data according to the engine cylinder pressure test data, the engine rotating speed test data, the cylinder vibration acceleration test data and the engine test parameter data.
The engine cylinder pressure test data, the engine rotating speed test data, the cylinder vibration acceleration test data and the engine test parameter data in the process can be obtained by testing the engine and are input into a main body running the method, so that the accuracy of engine excitation simulation is improved, and the simulation is more scientific and reasonable. The engine cylinder pressure test data representing the engine combustion cylinder pressure is one of main inputs for carrying out engine load simulation, the actual engine working combustion cylinder pressure reflects the characteristics of the engine in actual working, and the periodic and random working load of the engine can be obtained through conversion and can be used for finite element calculation, evaluation and optimization.
Specifically, in a preferred embodiment, the process of acquiring the test data may be:
1. before an engine is assembled, a cylinder pressure sensor is required to be installed and perforated on an engine cylinder cover;
2. arranging an engine crankshaft rotating speed sensor, and connecting an output signal of the engine crankshaft rotating speed sensor to a data acquisition device to obtain engine rotating speed test data;
3. the CAN line signal is connected with the data acquisition device and is used for acquiring engine test parameter data, such as message information of vehicle speed, gear, torque and the like;
4. the acceleration sensor is stuck on the cylinder body, and the signal output data is led into the data collector for obtaining rigid body vibration acceleration test data;
5. the cylinder pressure sensor is connected with the combustion analyzer, and then voltage data formed after being processed by the combustion analyzer is output to the data acquisition device so as to acquire engine cylinder pressure test data, and simultaneously, the cylinder pressure and the rotating speed are consistent with the time axis of the CAN signal;
6. setting a corresponding measuring range, sensor sensitivity and a measuring range;
7. selecting an angle domain of test data acquisition for testing;
8. the engine calibration is adjusted to enable the first cylinder to be deactivated (a certain cylinder of the engine does not spray oil, other cylinders spray oil normally, pistons in the cylinder without spraying oil move up and down according to the inertia of a crankshaft, and the air pressure in the cylinder is highest when the piston is at a top dead center after default cylinder deactivation), and engine speed signals and cylinder pressure during stable operation of the engine after cylinder deactivation are measured. The method is used for judging the accuracy of the test result;
9. and recovering the normal operation of the first cylinder, carrying out normal measurement, and obtaining finally required engine cylinder pressure test data, engine rotating speed test data, cylinder vibration acceleration test data and engine test parameter data.
The data is then input into the body in which the method is to be run, and the corresponding engine excitation data, such as a reciprocating inertial force excitation curve and a torque excitation curve, can be generated by means of, for example, load extraction software. The inertia force and the torque are integrated through a finite element simulation software card and then loaded on a power train model, so that the simulation of engine excitation can be realized.
Further, in a preferred embodiment, the preset acceleration excitation data further includes exhaust gas flow excitation data; step S102, acquiring preset acceleration excitation data, and further comprising:
acquiring the target exhaust system model, and defining finite element grid attributes based on the target exhaust system model based on preset attribute parameters;
defining a vibration boundary condition of an inlet end of the target exhaust system model and a sound absorption attribute of an outlet end of the target exhaust system model based on a preset inlet end parameter and a preset outlet end parameter;
and carrying out sound field distribution calculation on the target exhaust system model based on the finite element grid attribute, the vibration boundary condition and the sound absorption attribute to obtain the exhaust airflow excitation data.
The aim of the embodiment is to load the extracted engine cylinder pressure information through acoustic finite element analysis, calculate the sound pressure distribution of the exhaust pipe and further obtain the excitation data of the exhaust gas flow.
Specifically, in a preferred embodiment, the above process may be implemented by the following steps:
1. entering an acoustic finite element analysis module, and importing a target exhaust system model with an exhaust system finite element grid;
2. the finite element grid attribute, which is the type of the grid defined according to preset attribute parameters, and the grid type in the embodiment comprises a structural grid and an acoustic grid.
3. And defining finite element grid attributes such as materials and attributes of the structural grid and the fluid grid according to preset attribute parameters. The material of the structural grid is the density, the elastic modulus and the poisson ratio of the material to be defined, and the material of the fluid grid is the density of the material and the propagation speed of sound in the material to be defined only. The materials are respectively assigned to the corresponding attributes.
4. And defining an inlet end and an outlet end of the target exhaust system model based on the preset inlet end parameter and the preset outlet end parameter.
Specifically, vibration boundary conditions are defined at the inlet end and sound absorption properties are defined at the outlet end. The extracted engine cylinder pressure excitation is typically applied at the inlet end of the exhaust system, defining a boundary condition of full sound absorption at the outlet end of the exhaust system. The outlet of the exhaust system is directly connected with the atmosphere, sound is directly transmitted to the atmosphere through the outlet, and because the acoustic finite element grid is a solid grid, if the wall surface of the acoustic finite element grid is not treated, the sound is totally reflected after being transmitted to the interface of the outlet. To simulate the effect of sound without reflection at the outlet, a fully sound absorbing property may be defined at the outlet.
5. And continuing to calculate sound field distribution according to the defined finite element grid attribute, the vibration boundary condition of the inlet end and the sound absorption attribute of the outlet end, specifically calculating sound pressure distribution in the exhaust system caused by cylinder pressure excitation of the inlet of the exhaust system, and further obtaining exhaust gas flow excitation data.
Further, in a preferred embodiment, the step S103 is performed to apply excitation to the target finite element model based on the preset acceleration excitation data, and perform forced vibration analysis on the target finite element model after the excitation is applied, so as to obtain an acceleration response result, and specifically includes:
setting an engine excitation point in the powertrain model and an exhaust excitation point in the target exhaust system model;
applying excitation to the powertrain model according to the engine excitation data based on the engine excitation point, applying excitation to the target exhaust system model according to the exhaust gas flow excitation data based on the exhaust excitation point;
setting a response point in the target finite element model, and setting a response frequency and a modal solving frequency;
and based on the response frequency and the modal solving frequency, carrying out forced vibration analysis on the target finite element model after excitation is applied to obtain acceleration response data of the response point, and obtaining the acceleration response result according to the acceleration response data.
The above process establishes excitation of the powertrain model and excitation of the target exhaust system based on the engine excitation data and the exhaust gas flow excitation data, respectively, to obtain accurate and objective simulation results.
Specifically, in a preferred embodiment, the engine excitation data includes a reciprocating inertial force excitation profile and a torque excitation profile; the target exhaust system model comprises an exhaust hook model, and the response point is a connection point of the exhaust hook model and the BIP car body model; the modal solution frequency is at least 1.5 times the response frequency. The above limitations can further improve the accuracy of the simulation and analysis.
In this embodiment, acceleration response data of the response points (for example, acceleration of the response points in the target finite element model under excitation) is used as data for evaluating the jitter condition, and the acceleration response data is a specific and computable physical quantity, can visually represent the characteristic of the jitter, and can scientifically reflect the jitter state. For example, the degree of shaking and the shaking variation of the exhaust system can be expressed by statistical characteristics such as the distribution condition and the fluctuation condition of acceleration response data at a plurality of different times. Specifically, the acceleration vibration can be evaluated by taking the weighted acceleration root mean square value as the acceleration response result, when the weighted acceleration root mean square value is too high, the acceleration response value of the response point is proved to change drastically, and the vibration of the exhaust system is obviously represented to be drastic at the moment, so that the comfort of passengers is reduced, and the same is true.
Thus, further, in a preferred embodiment, the acceleration response result is a numerical value characterizing a statistical characteristic of the acceleration response data; step S104, analyzing the acceleration response result to obtain an acceleration jitter analysis result of the target exhaust system, which specifically includes:
comparing the acceleration response result with a preset threshold value;
if the acceleration response result is greater than or equal to a preset threshold value, an acceleration jitter analysis result that the target exhaust system has jitter risk in an acceleration state is obtained;
and if the acceleration response result is smaller than a preset threshold value, obtaining an acceleration jitter analysis result that the target exhaust system does not have jitter risk in an acceleration state.
The present invention also provides a more detailed embodiment for more clearly describing the above steps S101 to S104:
(1) And carrying out finite element modeling on the target exhaust system, a power train where the target exhaust system is positioned and the BIP car body to obtain a target exhaust system model, a power train model and a BIP car body model.
When finite element modeling is carried out, the average size of a shell unit is 12mm, the average size of a solid unit is 10mm, the unit size of a part with complex geometric characteristics can be properly reduced, and the solid unit is generally a second-order 4-surface unit, and the minimum size is 6mm. The engine model in the power train model is simulated by a concentrated mass CONM2 unit, actual mass, rotational inertia and other parameters are applied, and the engine model is connected with the engine suspension model in the power train model through an RBE2 rigid unit.
(2) And performing finite element assembly connection on the target exhaust system model, the power train model and the BIP vehicle body model to obtain a target finite element model.
The engine suspension model is simulated by a CBUSH spring unit, the actually measured six-directional rigidity is endowed, one end of the engine suspension model of the CBUSH unit is connected with the engine model, and the other end of the engine suspension model of the CBUSH unit is connected with the BIP car body model. The exhaust lifting lug model in the target exhaust system is simulated by a CBUSH spring unit, and the actual measurement six-direction rigidity is endowed to be connected with the BIP car body model.
(3) And (3) applying engine excitation force to the power train model (based on engine excitation data), applying exhaust gas flow excitation force to the target exhaust system model (based on exhaust gas flow excitation data), and performing forced vibration analysis on the whole target finite element model after excitation.
In the process of forced vibration analysis, care needs to be taken:
1. the excitation points for applying excitation comprise an engine excitation point and an exhaust excitation point which are respectively positioned in the two models;
2. establishing an acceleration list according to preset acceleration excitation data, copying the frequency and corresponding acceleration data according to the preset acceleration excitation data into a table (copy and paste according to columns) in a finite element system, and copying the frequency and corresponding phase angle into a new load set by adopting the same form according to corresponding phase information;
3. when excitation information is established, forced acceleration in three directions is required to be loaded X, Y, Z independently for each excitation point. The forced acceleration needs to define a forced loading card, and the forced loading card can define displacement, speed and acceleration and is identified by software as the load type of the force boundary condition;
4. the defined response point is the connection point of the exhaust hook and the BIP car body model in the target exhaust system model. The defined response frequency is the frequency range in which the calculation result is set. When defining the modal solving frequency, the modal solving parameters are required because the modal frequency response calculation is a frequency response function obtained by linearly superposing the modes in the modal space. The modal solution frequency range is at least 1.5 times the response frequency range.
(4) And extracting the acceleration response of the response point, and obtaining an acceleration response result.
(5) If the acceleration response result of the target exhaust system does not reach the standard (i.e. is higher than the preset threshold), the target exhaust system is indicated to have a shaking risk in an acceleration state, and structures and positions of the exhaust hooks and the like need to be optimized.
(6) If the acceleration response result of the target exhaust system meets the standard (i.e. is lower than the preset threshold value), the target exhaust system is indicated to have no acceleration shake risk.
In order to better implement the method for analyzing acceleration shake of an exhaust system according to the embodiment of the present invention, referring to fig. 2, fig. 2 is a schematic structural diagram of an embodiment of an acceleration shake analysis system of an exhaust system according to the present invention, where the embodiment of the present invention provides an acceleration shake analysis system 200 of an exhaust system, including:
the model input module 210 is configured to obtain a target finite element model established based on a target exhaust system, where the target finite element model includes a target exhaust system model corresponding to the target exhaust system, and a powertrain system model and a BIP vehicle body model that are assembled and connected with the target exhaust system model;
the excitation input module 220 is configured to acquire preset acceleration excitation data;
the excitation simulation module 230 is configured to apply excitation to the target finite element model based on the preset acceleration excitation data, and perform forced vibration analysis on the target finite element model after the excitation is applied, so as to obtain an acceleration response result;
and the response analysis module 240 is configured to analyze the acceleration response result to obtain an acceleration jitter analysis result of the target exhaust system.
What needs to be explained here is: the corresponding system 200 provided in the foregoing embodiments may implement the technical solutions described in the foregoing method embodiments, and the specific implementation principles of the foregoing modules or units may be referred to the corresponding content in the foregoing method embodiments, which is not repeated herein.
Referring to fig. 3, fig. 3 is a schematic structural diagram of an electronic device according to an embodiment of the invention. Based on the above-mentioned method for analyzing the accelerated jitter of the exhaust system, the present invention further provides an apparatus 300 for analyzing the accelerated jitter of the exhaust system, that is, the above-mentioned electronic apparatus, where the apparatus 300 for analyzing the accelerated jitter of the exhaust system may be a computing apparatus such as a mobile terminal, a desktop computer, a notebook computer, a palm computer, and a server. The exhaust system acceleration shake analysis apparatus 300 includes a processor 310, a memory 320, and a display 330. Fig. 3 shows only some of the components of the exhaust system acceleration shake analysis apparatus, but it should be understood that not all of the illustrated components are required to be implemented, and more or fewer components may alternatively be implemented.
The memory 320 may be an internal storage unit of the exhaust system acceleration shake analysis apparatus 300 in some embodiments, such as a hard disk or a memory of the exhaust system acceleration shake analysis apparatus 300. The memory 320 may also be an external storage device of the exhaust system acceleration shake analysis apparatus 300 in other embodiments, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash Card (Flash Card) or the like, which are provided on the exhaust system acceleration shake analysis apparatus 300. Further, the memory 320 may also include both internal and external memory devices of the exhaust system acceleration shake analysis apparatus 300. The memory 320 is used for storing application software installed in the exhaust system acceleration shake analysis apparatus 300 and various data, such as program codes for installing the exhaust system acceleration shake analysis apparatus 300. The memory 320 may also be used to temporarily store data that has been output or is to be output. In one embodiment, the memory 320 stores an exhaust system acceleration shake analysis program 340, and the exhaust system acceleration shake analysis program 340 is executable by the processor 310 to implement the exhaust system acceleration shake analysis method according to embodiments of the present application.
The processor 310 may in some embodiments be a central processing unit (Central Processing Unit, CPU), microprocessor or other data processing chip for executing program code or processing data stored in the memory 320, such as performing exhaust system acceleration shake analysis methods, etc.
The display 330 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, an OLED (Organic Light-Emitting Diode) touch, or the like in some embodiments. The display 330 is used to display information at the exhaust system acceleration shake analysis apparatus 300 and to display a visual user interface. The components 310-330 of the exhaust system acceleration shake analysis apparatus 300 communicate with each other via a system bus.
In one embodiment, the steps in the exhaust system acceleration shake analysis method as described above are implemented when the processor 310 executes the exhaust system acceleration shake analysis program 340 in the memory 320.
The present embodiment also provides a computer-readable storage medium having stored thereon an exhaust system acceleration shake analysis program which, when executed by a processor, implements the steps of the above embodiments.
The invention provides an acceleration jitter analysis method, a system, electronic equipment and a medium of an exhaust system, which are characterized in that a target finite element model established based on the target exhaust system is firstly obtained, then preset acceleration excitation data is obtained, excitation is applied to the target finite element model based on the preset acceleration excitation data, forced vibration analysis is carried out on the target finite element model after the excitation is applied to obtain an acceleration response result, and finally the acceleration response result is analyzed to obtain the acceleration jitter analysis result of the target exhaust system. Compared with the prior art, the method and the device construct the target finite element model through the target exhaust system model, the power train model and the BIP car body model, so that the subsequent analysis can simulate the real situation most, and after simulation excitation, the acceleration shaking state of the abstract exhaust system is represented through the specific acceleration response result, and the analysis of the acceleration shaking of the exhaust system is perfectly and accurately realized.
The present invention is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present invention are intended to be included in the scope of the present invention.
Claims (10)
1. An exhaust system acceleration shake analysis method, comprising:
acquiring a target finite element model established based on a target exhaust system, wherein the target finite element model comprises a target exhaust system model corresponding to the target exhaust system, and a power train model and a BIP vehicle body model which are assembled and connected with the target exhaust system model;
acquiring preset acceleration excitation data;
applying excitation to the target finite element model based on the preset acceleration excitation data, and performing forced vibration analysis on the target finite element model subjected to the excitation to obtain an acceleration response result;
and analyzing the acceleration response result to obtain an acceleration shaking analysis result of the target exhaust system.
2. The exhaust system acceleration shake analysis method according to claim 1, characterized in that the preset acceleration excitation data includes engine excitation data; the acquiring the preset acceleration excitation data comprises the following steps:
acquiring engine cylinder pressure test data, engine rotating speed test data, cylinder vibration acceleration test data and engine test parameter data corresponding to an engine in the power assembly system model;
and obtaining the engine excitation data according to the engine cylinder pressure test data, the engine rotating speed test data, the cylinder vibration acceleration test data and the engine test parameter data.
3. The exhaust system acceleration shake analysis method according to claim 2, characterized in that the preset acceleration excitation data further includes exhaust gas flow excitation data; the acquiring the preset acceleration excitation data further comprises:
acquiring the target exhaust system model, and defining finite element grid attributes based on the target exhaust system model based on preset attribute parameters;
defining a vibration boundary condition of an inlet end of the target exhaust system model and a sound absorption attribute of an outlet end of the target exhaust system model based on a preset inlet end parameter and a preset outlet end parameter;
and carrying out sound field distribution calculation on the target exhaust system model based on the finite element grid attribute, the vibration boundary condition and the sound absorption attribute to obtain the exhaust airflow excitation data.
4. The method for analyzing acceleration shake of an exhaust system according to claim 3, wherein the step of applying excitation to the target finite element model based on the preset acceleration excitation data, and performing forced vibration analysis on the target finite element model after the excitation is applied, to obtain an acceleration response result, includes:
setting an engine excitation point in the powertrain model and an exhaust excitation point in the target exhaust system model;
applying excitation to the powertrain model according to the engine excitation data based on the engine excitation point, applying excitation to the target exhaust system model according to the exhaust gas flow excitation data based on the exhaust excitation point;
setting a response point in the target finite element model, and setting a response frequency and a modal solving frequency;
and based on the response frequency and the modal solving frequency, carrying out forced vibration analysis on the target finite element model after excitation is applied to obtain acceleration response data of the response point, and obtaining the acceleration response result according to the acceleration response data.
5. The exhaust system acceleration shake analysis method according to claim 4, wherein the engine excitation data includes a reciprocating inertial force excitation curve and a torque excitation curve; the target exhaust system model comprises an exhaust hook model, and the response point is a connection point of the exhaust hook model and the BIP car body model; the modal solution frequency is at least 1.5 times the response frequency.
6. The exhaust system acceleration vibration analysis method according to claim 5, characterized in, that the acceleration response result is a numerical value characterizing a statistical feature of the acceleration response data; the step of analyzing the acceleration response result to obtain an acceleration shake analysis result of the target exhaust system includes:
comparing the acceleration response result with a preset threshold value;
if the acceleration response result is greater than or equal to a preset threshold value, an acceleration jitter analysis result that the target exhaust system has jitter risk in an acceleration state is obtained;
and if the acceleration response result is smaller than a preset threshold value, obtaining an acceleration jitter analysis result that the target exhaust system does not have jitter risk in an acceleration state.
7. The exhaust system acceleration shake analysis method according to claim 1, characterized in that the target finite element model adopts a second order tetrahedral unit as a solid unit; the target exhaust system model comprises an exhaust lifting lug model, wherein the exhaust lifting lug model is simulated by a CBUSH spring unit and is endowed with actually measured six-directional rigidity, and the exhaust lifting lug model is assembled and connected with the BIP car body model; the power train model comprises an engine model and an engine suspension model, wherein the engine model is simulated by adopting a concentrated mass CONM2 unit and is connected with the engine suspension model through an RBE2 rigid unit, the engine suspension model is simulated by adopting a CBUSH spring unit and is endowed with the six-direction rigidity of actual measurement, one end of the engine suspension model is connected with the engine model, and the other end of the engine suspension model is connected with the BIP car body model in an assembling way.
8. An exhaust system acceleration shake analysis system, comprising:
the model input module is used for acquiring a target finite element model established based on a target exhaust system, wherein the target finite element model comprises a target exhaust system model corresponding to the target exhaust system, and a power assembly system model and a BIP vehicle body model which are assembled and connected with the target exhaust system model;
the excitation input module is used for acquiring preset acceleration excitation data;
the excitation simulation module is used for applying excitation to the target finite element model based on the preset acceleration excitation data, and carrying out forced vibration analysis on the target finite element model after the excitation is applied to obtain an acceleration response result;
and the response analysis module is used for analyzing the acceleration response result to obtain an acceleration jitter analysis result of the target exhaust system.
9. An electronic device comprising a memory and a processor, wherein,
the memory is used for storing programs;
the processor, coupled to the memory, for executing the program stored in the memory to implement the steps in the exhaust system acceleration shake analysis method of any one of the preceding claims 1 to 7.
10. A computer readable storage medium storing a computer readable program or instructions which, when executed by a processor, is capable of carrying out the steps of the exhaust system acceleration shake analysis method of any one of the preceding claims 1 to 7.
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