CN116502342A - Virtual simulation-based automobile engine hood fatigue endurance life prediction method and system - Google Patents
Virtual simulation-based automobile engine hood fatigue endurance life prediction method and system Download PDFInfo
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Abstract
The invention relates to the technical field of automobile simulation tests, and particularly discloses an automobile engine hood fatigue endurance life prediction method and system based on virtual simulation; the method comprises the steps of building a bonnet, cutting off a decorative car body and a crushing type buffer block model, matching the models to obtain a bonnet opening and closing analysis display dynamics model, building welding joints among sheet metal parts of the bonnet model, normalizing the welding joints, carrying out refined modeling on welding cores, carrying out normalization processing on the welding cores in welding spot endurance fatigue analysis, adopting the normalized welding cores to have toughness, preventing unit shearing and locking phenomena from occurring, enabling the welding cores to bear stretching, bending and shearing actions, simultaneously obtaining all load steps of the bonnet in the longest vibration period of the bonnet, and finally carrying out sheet metal and welding spot fatigue endurance analysis to realize the endurance life prediction of accumulated opening and closing of the bonnet.
Description
Technical Field
The invention relates to the technical field of automobile simulation tests, in particular to an automobile engine hood fatigue endurance life prediction method and system based on virtual simulation.
Background
With the popularization of new energy automobiles, the arrangement of the front engine room is different from that of a traditional fuel oil type automobile, and the design and arrangement of the front storage box of the new energy automobile are introduced, so that the opening and closing frequency of an automobile engine cover is greatly improved. In addition, in order to achieve the impact protection performance on pedestrians, the adoption of a buffer structure design on an automobile engine cover is a common practice for automobile manufacturers at home and abroad. However, the cumulative impact of hood closure service will affect the endurance life of the hood. At present, a physical experiment method is mainly adopted for predicting the durability of the engine hood of the pedestrian protection system of the automobile, and the method is particularly easy to cause the damage of a buffer structure on the engine hood, so that the cost is increased. In order to meet the design target requirements in advance in the design stage, the endurance life of the engine hood of the pedestrian protection system of the automobile needs to be predicted, so that the damage of a physical test to a buffer structure can be reduced, and the aims of reducing cost and enhancing efficiency can be achieved; at present, a reliable and effective method for predicting the durability life of an automobile engine hood in the design and development stage is not available.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides a virtual simulation-based automobile engine hood fatigue endurance life prediction method and system.
According to an embodiment of the first aspect of the present invention, a method for predicting fatigue durability of an automobile engine hood based on virtual simulation is characterized by comprising:
step S1: establishing an engine cover data model, and performing finite element mesh division on the engine cover data model to obtain a meshed engine cover model;
step S2: establishing welding spot joints between the gridding engine cover model sheet metal parts, and carrying out normalization treatment on the welding spot joints;
step S3: establishing a crushing type buffer block model grid-connected meshing, endowing mechanical property attributes to the crushing type buffer block model, assembling the crushing type buffer block model to the surface of the inner plate of the meshing type engine cover model to obtain an assembled engine cover model, and inputting mechanical property parameters meeting model constraint conditions to the assembled engine cover model;
step S4: establishing a cut-off decoration vehicle body model grid connection meshing, and assembling the assembled engine cover model to the cut-off decoration vehicle body model to obtain an analysis dynamics model;
step S5: setting and debugging boundary conditions and mechanical parameter output of the analysis dynamics model, performing intensity analysis calculation on the debugged analysis dynamics model, and obtaining an energy change value and a longest oscillation period of an engine cover according to the intensity analysis calculation;
step S6: and determining a load data value according to all load steps in the longest oscillation period of the engine cover, and respectively carrying out sheet metal fatigue durability analysis and welding spot fatigue durability analysis on the analysis dynamics model according to the load data value to obtain the fatigue durability service life of the engine cover.
According to some embodiments of the present invention, the establishing a solder joint between the gridding engine cover model sheet metal parts, and normalizing the solder joint, includes:
three layers of hexahedral units are arranged on the welding spot joint, and the joint of the upper layer and the lower layer of the welding spot joint and the sheet metal unit is arranged in a surface contact manner;
and (3) grid re-matching is carried out on the sheet metal units connected with the two ends of the welding joint, so that the units of the upper sheet metal and the lower sheet metal at the welding joint are consistent.
According to some embodiments of the present invention, the establishing a grid-connected meshing of the crush buffer module, imparting mechanical performance properties to the crush buffer module, and assembling the crush buffer module to the surface of the inner plate of the meshing engine cover module to obtain an assembled engine cover module, and outputting mechanical property parameters meeting model constraint conditions to the assembled engine cover module, including:
establishing the crushing type buffer block model in a mechanical property equivalent modeling mode;
obtaining a curve of displacement and compression load force according to an actual compression test of the crushing type buffer block, and endowing the crushing type buffer block model with mechanical property attribute according to the curve of the displacement and the compression load force;
and (3) restraining the rotational freedom degree of the upper end node and the lower end node of the crushing type buffer block model, and reserving the freedom degree in the central axis direction.
According to some embodiments of the invention, after the establishing the truncated decorative body model for grid-connection and assembling the assembling engine cover model to the truncated decorative body model to obtain the analysis dynamics model, the method further comprises:
acquiring a change value of a barycenter coordinate of opening and closing of the engine cover in the analysis dynamics model, and calculating to obtain initial energy of closing the engine cover and angular speed of initial rotation impact of the engine cover according to the change value of the barycenter coordinate;
according to the initial energy of the engine cover closing and the angular speed of the engine cover initial rotation impact, endowing the engine cover with initial potential energy of the engine cover closing and the angular speed of the initial rotation impact;
according to some embodiments of the invention, the obtaining the change value of the barycenter coordinates of the opening and closing of the engine cover in the analysis dynamics model, and calculating the initial energy of the engine cover closing and the angular velocity of the initial rotation impact of the engine cover according to the change value of the barycenter coordinates, includes:
obtaining the height of the change of the opening and closing gravity center of the engine cover according to the change value of the opening and closing gravity center coordinates of the engine cover in the analysis dynamics model;
according to the structure adopted by the engine cover mounting hinge, determining the position of an engine cover rotating shaft, and determining the vertical distance between the gravity center position of the engine cover and the engine cover rotating shaft according to the position of the engine cover rotating shaft;
calculating initial energy of closing the engine cover and angular speed of initial rotation impact of the engine cover according to the height of the opening and closing gravity center change of the engine cover and the vertical distance between the gravity center position of the engine cover and the rotating shaft of the engine cover;
according to some embodiments of the invention, the calculating the initial energy of the closing of the engine cover and the angular velocity of the initial rotation impact of the engine cover according to the height of the change of the center of gravity of the opening and closing of the engine cover and the vertical distance between the center of gravity of the engine cover and the rotating shaft of the engine cover comprises:
the initial energy of the engine cover closing and the angular velocity calculation formula of the engine cover initial rotation impact are as follows:
in the method, in the process of the invention,the height of the engine cover from a preset opening angle to a closing state gravity center change according to design requirements; />The engine cover rotates at an angular speed in a slightly opened state; />Is the mass of the hood; />Is the gravitational field acceleration;
is the rotational inertia of the bonnet about the bonnet axis of rotation; />Is the vertical distance between the center of gravity of the engine cover and the rotating shaft of the engine cover in the slightly opened state of the engine cover;
according to some embodiments of the present invention, the setting and debugging of boundary conditions and mechanical parameter outputs of the analytical dynamics model, performing intensity analysis calculation on the debugged analytical dynamics model, and obtaining an energy change curve and a longest oscillation period of an engine cover according to a result of the intensity analysis calculation, includes:
performing parameter setting on the analysis dynamics model, wherein the parameter setting comprises the following steps: the engine cover node gives initial acceleration, applies a gravity field to the analysis dynamics model, adds freedom degree constraint to a model cut-off position, and performs energy, stress, node force and displacement related output setting on the analysis dynamics model;
debugging according to the analysis dynamics model with the set parameters, and performing intensity analysis calculation on the adjusted analysis dynamics model;
and obtaining an energy variation curve, a longest oscillation period of the engine cover and a time history curve of acting force and compression amount when the crushing buffer block is compressed according to the result of the intensity analysis and calculation.
According to a second aspect of the present invention, an automobile hood fatigue durability life prediction system based on virtual simulation includes:
the first modeling module is used for creating a dynamic model for the engine hood, the truncated decorative vehicle body and the crushing type buffer block;
the second modeling module is used for establishing a welding spot joint model between the sheet metal parts of the engine hood dynamics model;
the grid division module is configured to carry out finite element grid division on the models created by the first modeling module and the second modeling module;
the normalization processing module is configured to normalize the welding spot joint model established by the second modeling module and normalize welding cores in the welding spot endurance fatigue analysis;
the first assignment module is configured to assign materials, dimensions and mechanical properties to the models created by the first modeling module and the second modeling module;
the second assignment module is configured to assign the gravity field, the freedom degree constraint and the contact surface parameter to the model created by the first modeling module and the second modeling module;
the simulation calculation module is configured to calculate the established finite element mesh divided model through finite element simulation, and finally predicts sheet metal fatigue durability analysis and welding spot fatigue durability analysis data on the engine cover in the simulation so as to obtain the accumulated service life of the engine cover opening and closing.
According to a third aspect of the present invention, a computer readable storage medium, on which a computer program is stored, is characterized in that the computer program is executed after being read by a processor to perform the steps of the virtual simulation based method for predicting fatigue durability life of an automobile hood according to the first aspect of the present invention.
A computer device according to an embodiment of the fourth aspect of the present invention comprises a storage medium, a processor and a computer program, the computer program being stored on the storage medium, characterized in that the processor executes the computer program after reading the computer program from the storage medium to perform the steps of the virtual simulation based method for predicting the fatigue durability of an automotive hood according to the embodiment of the first aspect of the present invention.
The technical scheme provided by the embodiment of the invention at least comprises the following beneficial effects:
constructing a truncated decorative vehicle body model and a bonnet model in three-dimensional software, meshing and assembling the models to obtain an analysis display dynamics model, establishing connection of welding joints and endowment of related attributes between bonnet model sheet metal parts, carrying out normalization treatment on the welding joints, carrying out fine modeling on welding cores, and simultaneously determining the longest oscillation period time of a bonnet of an automobile pedestrian protection system, so that impact load can be accurately obtained for predicting fatigue endurance life;
normalizing the sizes of the welding joint and the welding core, and carrying out fine modeling on the welding core, so that the contact effect of the metal plate surface of the joint is fully considered; the weld nugget has better toughness and can bear the functions of stretching, bending and shearing; and acquiring more force and torque information around the welding point joint, so as to improve the accuracy and reliability of the endurance fatigue of the welding point.
The modeling difficulty of the crushing type buffer blocks is simplified by the model processing of the crushing type buffer blocks of the engine hood of the pedestrian protection system of the automobile, and the modeling efficiency is improved. The equivalent treatment of the mechanical properties of the crushing type buffer blocks of the engine hood of the pedestrian protection system guarantees the mechanical properties of the crushing type buffer blocks when in action, and ensures the coincidence with the actual action;
the method for predicting the endurance life of the engine cover of the pedestrian protection system of the automobile based on the virtual simulation digital technology in the design and research stage is provided, the endurance life of the accumulated opening and closing of the engine cover of the pedestrian protection system of the automobile is predicted on the premise of ensuring that the pedestrian protection system is not started, the damage of a physical test to a buffer structure can be reduced, and the aims of reducing cost and enhancing efficiency can be achieved.
Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a method for predicting fatigue durability life of an automobile hood based on virtual simulation according to an embodiment of the invention;
FIG. 2 is a graph of compression displacement versus compression load capacity for a crush pad in accordance with an embodiment of the present invention;
FIG. 3 is a block diagram of an automotive hood fatigue durability life prediction system based on virtual simulation in accordance with an embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is exemplary, with reference to the accompanying drawings, it being understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit the application.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Example 1
Referring to fig. 1 to 2, the present embodiment provides a method for predicting fatigue endurance life of an automobile engine hood based on virtual simulation, including:
in step S1, a hood data model is established, and finite element mesh division is carried out on the hood data model to obtain a meshed hood model;
it should be noted that, the steps of the method in this embodiment are completed based on three-dimensional modeling software and finite element analysis software, and the process of describing the steps of the method is described based on three-dimensional modeling software and finite element analysis software interfaces and functions, and in this step, the engine hood data model may be exemplarily established through the Catia modeling software, and the engine hood Catia data model is imported into the Hypermesh Abaqus Explict module for finite element mesh model establishment, and it should be understood that, in this step, the engine hood model size is equivalent to the actual engine hood size, and meanwhile, the material attribute setting of the engine hood is the same as the actual vehicle engine hood material attribute;
in step S2, a welding joint is established between the gridding engine cover model sheet metal parts, and normalization treatment is carried out on the welding joint;
in this step, a welding joint is established between the meshed engine cover model sheet metal parts, the number of the welding joints can be set according to actual requirements, the welding joint is normalized at a Hypermesh Abaqus Explict module, the normalization process is that the welding joint adopts a surface contact method (ACM, area contact methods) before and after the welding joint normalization process, welding cores adopt hexahedral units C3D8I, and the diameter of the welding cores can be set to be 6mm; the welding cores are all connected with the joint sheet metal through the DCOUP3D unit.
Illustratively, before the normalization treatment of the welding joint, the sheet metal units of the welding joint are free and have insufficient consistency, so that the DCOUP3D units are connected in a scattered manner, and the node force and the torque of the welding joint DCOUP3D units are greatly influenced by the shape and the size of the sheet metal units of the joint. In order to solve the consistency of the sheet metal units of the welding joint, the welding joints are connected by adopting Bar or Beam units, and the sheet metal units connected by the Bar or Beam units are subjected to grid re-matching, so that the units of the upper sheet metal and the lower sheet metal at the welding joints are consistent. And finally, re-realizing the welding joint by adopting an ACM method, so as to obtain a normalized welding joint, wherein the normalizing treatment process of the welding joint is carried out in Hypermesh software, and the normalized welding joint is treated by a spot function under a connector panel.
The welding spot has a certain tenability, only one hexahedral unit C3D8I is utilized, the rigidity is overlarge, the welding core unit can not bear bending and shearing actions and can only bear stretching actions, three layers of hexahedral units are adopted, 36 welding cores are used for carrying out fine modeling, the upper and lower layers of connecting piece joint metal plates are connected by DCOUP3D units, the number of the DCOUP3D units after normalization processing is more than that before normalization processing, the uniformity is better, more force and torque information around the welding spot joint can be acquired more accurately, and the accuracy and reliability of durable fatigue of the welding spot are further improved.
It should be noted that, the weld core after normalization treatment has toughness, and can prevent the phenomenon of unit shearing locking in calculation, so that the weld core can bear stretching, bending and shearing actions, and meanwhile, the weld joint normalization treatment has the advantages that: the advantage that the Bar or Beam unit is used as a welding spot to enable the joint sheet metal unit to keep consistency is inherited; the contact effect of the metal plate surfaces of the joints is considered; the weld nugget has better toughness and can bear the functions of stretching, bending and shearing; the DCOUP3D unit obtains force and torque information around more welding joints, so that accuracy and reliability of durable fatigue of welding joints are improved.
In step S3, establishing a crushing type buffer block model grid-connected grid, endowing mechanical property attributes to the crushing type buffer block model, assembling the crushing type buffer block model to the surface of the grid type engine cover model inner plate to obtain an assembled engine cover model, and inputting mechanical property parameters meeting model constraint conditions to the assembled engine cover model;
in the step, as the model of the crushing type buffer block is complex, the equivalent modeling of mechanical properties is adopted for the crushing type buffer block model. The hood inner panel establishes an interaction with the crush boxes, the compression of which is determined by deformation of the Beam unit, and in order to prevent rotation of the Beam unit, rotational degrees of freedom are constrained to the nodes of the head and tail of the unit, preserving axial degrees of freedom.
As shown in fig. 2, the mechanical performance curve of the crushing type buffer block is given to the Beam unit by the attribute by using the compression displacement and force curve obtained by the test, and the crushing type buffer block gradually goes through the rubber compression stage, the action state stage of the crushing device, the crushing state stage of the crushing device and the complete failure state stage of the crushing device in the compression test process.
In some embodiments, after obtaining the results of the intensity analysis data of the dynamic analysis of the bonnet slamming display of the pedestrian protection system, it is necessary to extract the time course curve of the force and the compression amount when the crushing type buffer block interacts with the bonnet, and obtain the state stage that can be reached by the compression of the crushing type buffer block. And judging the rationality of the design of the engine cover according to the state stage which can be reached by compressing the crushing type buffer blocks. If the crushing type buffer block is compressed to enter a crushing state, the engine cover is unreasonable in design and is fed back and redesigned.
In step S4, establishing a truncated decorative vehicle body model grid-connected grid, and assembling the assembled engine cover model to the truncated decorative vehicle body model to obtain an analysis dynamics model;
in the step, after an engine cover analysis dynamics model is obtained, an engine cover opening and closing barycenter coordinate change value in the analysis dynamics model is obtained, and initial energy of engine cover closing and angular speed of engine cover initial rotation impact are obtained through calculation according to the barycenter coordinate change value; according to the initial energy of the engine cover closing and the angular speed of the engine cover initial rotation impact, endowing the engine cover with initial potential energy of the engine cover closing and the angular speed of the initial rotation impact;
the method includes the steps of (1) rotating a bonnet to a preset opening angle according to design specification requirements to obtain barycenter coordinates G1 (X1, Y1, Z1) of the bonnet in a preset opening angle state, rotating the bonnet to a closed state again to obtain barycenter G0 (X0, Y0, Z0) of the bonnet in the closed state, and calculating initial slamming energy and angular speed of initial rotational impact of the bonnet according to a formula; if the engine cover mounting hinge adopts a four-bar structure, the intersection point formed by the mutual intersection of the connecting lines of the rotation centers of the two connecting bars is the rotating shaft of the engine cover in a slightly opened state;
the calculation formula of the initial energy of the engine cover closing and the angular speed of the engine cover initial rotation impact is as follows:
in the method, in the process of the invention,the height of the engine cover from a preset opening angle to a closing state gravity center change according to design requirements; />The engine cover rotates at an angular speed in a slightly opened state; />Is the mass of the hood; />Is the gravitational field acceleration;is the rotational inertia of the bonnet about the bonnet axis of rotation; />Is the vertical distance between the center of gravity of the engine cover and the rotating shaft of the engine cover in the slightly opened state of the engine cover;
in step S5, setting and debugging the boundary conditions and mechanical parameters of the analysis dynamics model, performing intensity analysis calculation on the debugged analysis dynamics model, and obtaining an energy variation value and a longest oscillation period of the engine cover according to the intensity analysis calculation;
in the step, the engine cover in the analysis dynamics model is rotated to a slight-opening state, the lock mechanism is in an opening state, and initial acceleration is given to all nodes on the engine cover; the whole engine cover strong-closure analysis shows that the dynamic model applies a gravity field; adding all degree of freedom constraints at the cut-off position of the model, and establishing a hinge unit at the rotation connection position of the engine cover and the lock structure; the display calculation time can be preset to be 0.1s, and the setting of quality scaling and contact correlation is properly completed; finishing related boundary condition setting, and performing related output setting such as energy, stress, node force, displacement and the like; and debugging the model and submitting the model for calculation of intensity analysis.
Further, importing analysis result data into the hyperview, running a closing action animation and outputting an energy curve to obtain the longest oscillation period of the engine cover; the time history curve of the force and the compression amount when the crushing type buffer block interacts with the engine cover is required to be extracted. If the working state of the crushing type buffer block does not enter the stage of the crushing state, the crushing type engine cover is indicated to accord with the design expectation; if the working state of the crushing type buffer block enters the crushing state stage, the crushing type engine cover is not satisfied with the design expectation.
It should be noted that in this step, it is necessary to ensure whether the hood lock catch can be locked by the locking structure during the whole process of closing the impact rebound; second, it is also necessary to see the energy change to ensure that the internal energy is positive, the hourglass energy is less than 10% of the maximum peak of the internal energy, and the ratio of total energy to initial energy is close to 1. And finally, acquiring a Z-displacement curve of a plurality of points of front and rear corner points of the outer plate of the engine cover, acquiring the longest oscillation period of the engine cover, and defining the time of 3 times of the Z-displacement curve passing through the 0-axis bottom as the longest oscillation period, namely comprising one impact and rebound.
In step S6, determining a load data value according to all load steps in the longest oscillation period of the engine cover, and respectively performing sheet metal fatigue durability analysis and welding spot fatigue durability analysis on the analysis dynamics model according to the load data value to obtain the fatigue durability service life of the engine cover.
In the step, the correct analysis result data is imported into Ncode software to respectively carry out sheet metal fatigue durability analysis and welding spot fatigue durability analysis; fatigue durability load data is derived from all load steps during the longest hood oscillation period. The fatigue durability analysis of the metal plate needs to input all S-N fatigue life curves of the inspected metal plate, and the fatigue durability analysis of the welding spots needs to input the S-N fatigue life curves of the metal plate of the welding core welding spot joint; in addition, because the modeling mode of ACM is adopted, the actual size of the welding core is determined by the force and torque equivalent to the welding core of the DCOUP3D unit connected with the welding core, and the software calculates the difference between the size of the welding core and the size of the actual welding core. Therefore, the size of the welding core is normalized and unified.
Illustratively, an advanced edit operation interface is opened under the welding spot analysis module, the diameter of welds is modified to be 6mm, and the normalization of the size of the welding core is completed. And finally, respectively submitting analysis and calculation of the fatigue endurance life of the metal plate and the welding spot, and outputting the respective fatigue life. If the fatigue life of the metal plate and the welding spot meets the expected design requirement, data archiving treatment is carried out; if the fatigue life of the metal plate and the welding point is not satisfied, or one of the metal plate and the welding point does not satisfy the expected design requirement, an optimization scheme needs to be provided and fed back to the forward design.
In the method, a truncated decorative vehicle body model and a bonnet model are built in three-dimensional software, finite element gridding and assembling are carried out on the models, an analysis display dynamics model is obtained, connection of welding joints and endowment of relevant attributes are established between bonnet model sheet metal parts, normalization treatment is carried out on the welding joints, refined modeling is carried out on welding cores, meanwhile, the longest oscillation period time of a bonnet of an automobile pedestrian protection system is determined, and impact load can be accurately obtained for predicting fatigue endurance life; normalizing the sizes of the welding joint and the welding core, and carrying out fine modeling on the welding core, so that the contact effect of the metal plate surface of the joint is fully considered; the weld nugget has better toughness and can bear the functions of stretching, bending and shearing; and acquiring more force and torque information around the welding point joint, so as to improve the accuracy and reliability of the endurance fatigue of the welding point.
The modeling difficulty of the crushing type buffer blocks is simplified by the model processing of the crushing type buffer blocks of the engine hood of the pedestrian protection system of the automobile, and the modeling efficiency is improved. The equivalent treatment of the mechanical properties of the crushing type buffer blocks of the engine hood of the pedestrian protection system guarantees the mechanical properties of the crushing type buffer blocks when in action, and ensures the coincidence with the actual action; the method for predicting the endurance life of the engine cover of the pedestrian protection system of the automobile based on the virtual simulation digital technology in the design and research stage is provided, the endurance life of the accumulated opening and closing of the engine cover of the pedestrian protection system of the automobile is predicted on the premise of ensuring that the pedestrian protection system is not started, the damage of a physical test to a buffer structure can be reduced, and the aims of reducing cost and enhancing efficiency can be achieved.
Example 2
Referring to fig. 3, the present embodiment provides a virtual simulation-based automobile hood fatigue durability life prediction system, and the virtual simulation-based automobile hood fatigue durability life prediction system 200 includes:
the first modeling module 210 is configured to perform dynamic model creation on the engine hood, the truncated decorative vehicle body and the crushing type buffer block;
the second modeling module 220 is configured to establish a solder joint model between the bonnet dynamics model sheet metal parts;
a meshing module 230 configured to perform finite element meshing on the models created by the first modeling module and the second modeling module;
a normalization processing module 240 configured to normalize the second modeling module to create a weld joint model and normalize the weld nugget in performing a weld endurance fatigue analysis
A first assignment module 250 configured to assign materials, dimensions, and mechanical properties to the models created by the first modeling module and the second modeling module;
a second assignment module 260 configured to assign gravity fields, degree of freedom constraints and contact surface parameters to the models created by the first and second modeling modules;
the simulation calculation module 270 is configured to calculate the established finite element mesh-divided model through finite element simulation, and finally predict the sheet metal fatigue endurance analysis and welding spot fatigue endurance analysis data on the engine cover in the simulation so as to obtain the accumulated service life of the engine cover opening and closing.
Example 3
The present embodiment provides a computer readable storage medium, on which a computer program is stored, which is read by a processor and then run to execute the steps of the virtual simulation-based method for predicting fatigue durability life of an automobile hood according to embodiment 1 of the present invention.
Example 4
The present embodiment provides a computer device including a storage medium, a processor and a computer program, where the computer program is stored on the storage medium, and the processor executes the computer program after reading the computer program from the storage medium to perform the steps of the virtual simulation-based method for predicting fatigue endurance life of an automobile hood according to embodiment 1 of the present invention.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In one typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include volatile memory in a computer-readable medium, random Access Memory (RAM) and/or nonvolatile memory, etc., such as Read Only Memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.
Computer readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of storage media for a computer include, but are not limited to, phase change memory (PRAM), static Random Access Memory (SRAM), dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), read Only Memory (ROM), electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), digital Versatile Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves. It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises an element.
In the description of the present specification, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples.
It will be apparent that the described embodiments are only some, but not all, of the embodiments of the present application. 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 application for the embodiment. 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 understand that the embodiments described herein may be combined with other embodiments. 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.
While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: many changes, modifications, substitutions and variations may be made to the embodiments without departing from the spirit and principles of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A fatigue endurance life prediction method of an automobile engine cover based on virtual simulation is characterized by comprising the following steps:
step S1: establishing an engine cover data model, and performing finite element mesh division on the engine cover data model to obtain a meshed engine cover model;
step S2: establishing welding spot joints between sheet metal parts of the gridding engine hood model, and carrying out normalization treatment on the welding spot joints;
step S3: establishing a crushing type buffer block model grid-connected meshing, endowing mechanical property attributes to the crushing type buffer block model, assembling the crushing type buffer block model to the surface of the inner plate of the meshing type engine cover model to obtain an assembled engine cover model, and inputting mechanical property parameters meeting model constraint conditions to the assembled engine cover model;
step S4: establishing a cut-off decoration vehicle body model grid connection meshing, and assembling the assembled engine cover model to the cut-off decoration vehicle body model to obtain an analysis dynamics model;
step S5: setting and debugging boundary conditions and mechanical parameter output of the analysis dynamics model, performing intensity analysis calculation on the debugged analysis dynamics model, and obtaining an energy change value and a longest oscillation period of an engine cover according to the intensity analysis calculation;
step S6: and determining a load data value according to all load steps in the longest oscillation period of the engine cover, and respectively carrying out sheet metal fatigue durability analysis and welding spot fatigue durability analysis on the analysis dynamics model according to the load data value to obtain the fatigue durability service life of the engine cover.
2. The virtual simulation-based automobile bonnet fatigue durability life prediction method according to claim 1, wherein the step of establishing a welding joint between the meshed bonnet model sheet metal parts and performing normalization processing on the welding joint comprises the steps of:
three layers of hexahedral units are arranged on the welding spot joint, and the joint of the upper layer and the lower layer of the welding spot joint and the sheet metal unit is arranged in a surface contact manner;
and (3) grid re-matching is carried out on the sheet metal units connected with the two ends of the welding joint, so that the units of the upper sheet metal and the lower sheet metal at the welding joint are consistent.
3. The virtual simulation-based method for predicting fatigue durability of an automobile bonnet according to claim 1, wherein the establishing a grid-connected meshing of a crush buffer model, assigning mechanical performance attributes to the crush buffer model, and assembling the crush buffer model to the surface of the inner plate of the meshing bonnet model to obtain an assembled bonnet model, and outputting mechanical attribute parameters satisfying model constraint conditions to the assembled bonnet model comprises:
establishing the crushing type buffer block model in a mechanical property equivalent modeling mode;
obtaining a curve of displacement and compression load force according to an actual compression test of the crushing type buffer block, and endowing the crushing type buffer block model with mechanical property attribute according to the curve of the displacement and the compression load force;
and (3) restraining the rotational freedom degree of the upper end node and the lower end node of the crushing type buffer block model, and reserving the freedom degree in the central axis direction.
4. The virtual simulation-based method for predicting fatigue life of an automobile bonnet, as set forth in claim 1, wherein after the establishing a truncated decorative body model is grid-connected, the assembling bonnet model to the truncated decorative body model to obtain an analysis dynamics model, further includes:
acquiring a change value of a barycenter coordinate of opening and closing of the engine cover in the analysis dynamics model, and calculating to obtain initial energy of closing the engine cover and angular speed of initial rotation impact of the engine cover according to the change value of the barycenter coordinate;
and according to the initial energy of the engine cover closing and the angular speed of the engine cover initial rotation impact, giving the engine cover closing initial potential energy and the angular speed of the initial rotation impact.
5. The method for predicting fatigue endurance life of an automobile engine cover based on virtual simulation according to claim 4, wherein the obtaining the change value of the barycenter coordinates of the engine cover opening and closing in the analysis dynamics model, and calculating the initial energy of engine cover closing and the angular velocity of the initial rotational impact of the engine cover according to the change value of the barycenter coordinates, comprises:
obtaining the height of the change of the opening and closing gravity center of the engine cover according to the change value of the opening and closing gravity center coordinates of the engine cover in the analysis dynamics model;
according to the structure adopted by the engine cover mounting hinge, determining the position of an engine cover rotating shaft, and determining the vertical distance between the gravity center position of the engine cover and the engine cover rotating shaft according to the position of the engine cover rotating shaft;
and calculating initial energy of closing the engine cover and angular speed of initial rotation impact of the engine cover according to the height of the change of the opening and closing gravity center of the engine cover and the vertical distance between the gravity center position of the engine cover and the rotating shaft of the engine cover.
6. The method for predicting fatigue life of an automobile hood based on virtual simulation according to claim 5, wherein the calculating the initial energy of hood closing and the angular velocity of initial rotational impact of the hood according to the height of the hood opening and closing gravity center change and the vertical distance between the position of the center of gravity of the hood and the rotational axis of the hood comprises:
the initial energy of the engine cover closing and the angular velocity calculation formula of the engine cover initial rotation impact are as follows:
in the method, in the process of the invention,is a height of the center of gravity of the hood from a preset opening angle to a closed state according to design requirements,/->Is the rotational angular velocity of the engine cover in the slightly opened state, < > of the engine cover>Is the mass of the hood, < >>Is the acceleration of the gravitational field,
is the moment of inertia of the hood around the hood axis of rotation, < >>Is the center of gravity position of the engine cover and the rotating shaft of the engine cover in the slightly opened state of the engine coverIs a vertical distance of (c).
7. The virtual simulation-based method for predicting fatigue endurance life of an automobile engine hood according to claim 1, wherein the performing boundary conditions and mechanical parameter output setting on the analytical dynamics model and debugging, performing intensity analysis calculation on the debugged analytical dynamics model, and obtaining an energy variation curve and an engine hood longest oscillation period according to the result of the intensity analysis calculation, comprises:
performing parameter setting on the analysis dynamics model, wherein the parameter setting comprises the following steps: the engine cover node gives initial acceleration, applies a gravity field to the analysis dynamics model, adds freedom degree constraint to a model cut-off position, and performs energy, stress, node force and displacement related output setting on the analysis dynamics model;
debugging according to the analysis dynamics model with the set parameters, and performing intensity analysis calculation on the adjusted analysis dynamics model;
and obtaining an energy change curve, a longest vibration period of the engine cover and a time history curve of acting force and compression amount when the crushing type buffer block is compressed according to the result of the strength analysis and calculation.
8. A virtual simulation-based automotive hood fatigue durability life prediction system, comprising:
the first modeling module is used for creating a dynamic model for the engine hood, the truncated decorative vehicle body and the crushing type buffer block;
the second modeling module is used for establishing a welding spot joint model between the sheet metal parts of the engine hood dynamics model;
the grid division module is configured to carry out finite element grid division on the models created by the first modeling module and the second modeling module;
the normalization processing module is configured to normalize the welding spot joint model established by the second modeling module and normalize welding cores in the welding spot endurance fatigue analysis;
the first assignment module is configured to assign materials, dimensions and mechanical properties to the models created by the first modeling module and the second modeling module;
the second assignment module is configured to assign the gravity field, the freedom degree constraint and the contact surface parameter to the model created by the first modeling module and the second modeling module;
the simulation calculation module is configured to calculate the established finite element mesh divided model through finite element simulation, and finally predicts sheet metal fatigue durability analysis and welding spot fatigue durability analysis data on the engine cover in the simulation so as to obtain the accumulated service life of the engine cover opening and closing.
9. A computer-readable storage medium, on which a computer program is stored, characterized in that the computer program is run after being read by a processor to perform the virtual simulation-based method for predicting the fatigue durability life of an automobile hood according to any one of claims 1 to 7.
10. A computer device comprising a storage medium, a processor and a computer program, the computer program being stored on the storage medium, characterized in that the processor, after reading the computer program from the storage medium, runs the computer program to perform the virtual simulation based method for predicting the fatigue life of an automotive hood according to any one of claims 1 to 7.
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