CN114943123A - Method for improving simulation analysis precision of control arm under spring - Google Patents
Method for improving simulation analysis precision of control arm under spring Download PDFInfo
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Abstract
The invention discloses a method for improving simulation analysis precision of a control arm under a spring, belonging to the technical field of CAE (computer aided engineering) simulation and comprising the steps of building a suspension system model; carrying out solid grid division on the lower control arm, the spring and the spring pad; leading the divided three-dimensional entity grids into a built suspension system model; defining the assembly and contact relationship of the control arm and the suspension system; defining equivalent stiffness, bushing preload and material properties of the damper channel; defining a preliminary constraint; performing assembly simulation of the spring and the spring pad; performing compression simulation of the spring in a design state; checking the result of the balance state; simulating the strength working condition; results post-treatment and evaluation. According to the method, the calculation accuracy of the position of the matching surface of the lower control arm spring can be improved by improving the modeling method and the simulation process near the hard point of the control arm spring, so that the strength and the durability of the lower control arm spring can be more accurately judged.
Description
Technical Field
The invention belongs to the technical field of CAE simulation, and particularly relates to a method for improving simulation analysis precision of a control arm under a spring.
Background
In a suspension structural member, a lower control arm carrying a spring/damper is commonly used for an E-type multi-link suspension system, and a common structure is shown in fig. 1, wherein a control arm hard point comprises a lower control arm outer point 1, a damper lower point 2, a spring lower point 3, a stabilizer link lower point 4 and a lower control arm inner point 5;
the analysis method for the lower control arm of the spring/damper mostly adopts single-piece analysis and establishes a suspension system model, and comprises the following steps:
firstly, single piece analysis, namely firstly carrying out load decomposition in multi-body dynamics software, then analyzing in a finite element by using an inertial release algorithm, establishing an RBE2, an RBE3 or a beam unit at 5 hard points, and adding decomposition load to an RBE2 main point, an RBE3 slave point or a node of the beam unit;
and secondly, establishing a suspension system model, namely introducing a control arm single piece and 5 RBE2, RBE3 or beam units at hard points together, establishing spring-like units such as connectors on RBE2 main points, RBE3 slave points or beam unit nodes, and connecting the spring-like units with the system model.
In the two analysis methods, the RBE3 unit is generally adopted for connection at the position near the lower point of the spring, and the stress result calculated by the algorithm has a certain difference compared with the actual state of the part, so that the precision is lower.
Disclosure of Invention
Aiming at the problems that the calculated stress result is different from the actual state of a part to a certain extent due to the fact that the positions near the hard point of the spring are mostly connected by adopting an RBE3 unit, the accuracy is low and the like in the prior art, the invention provides a method for improving the simulation analysis accuracy of a lower control arm.
The invention is realized by the following technical scheme:
a method for improving simulation analysis precision of a control arm under a spring specifically comprises the following steps:
the method comprises the following steps: building a suspension system model;
step two: carrying out solid grid division on the lower control arm, the spring and the spring pad, wherein the spring and the spring pad both use a geometric model in a free state;
step three: leading the divided three-dimensional entity grids into the suspension system model built in the step one;
step four: defining the assembly and contact relationship of the control arm and the suspension system;
step five: defining equivalent stiffness, bushing preload and material properties of the damper channel;
step six: defining a preliminary constraint: restraining front and rear points of the auxiliary frame, a front point of the trailing arm, an upper point of the shock absorber, an upper point of the spring and a wheel center;
step seven: performing assembly simulation of the spring and the spring pad, observing whether the deformation and the contact force of the result are reasonable or not, and returning to check the model definition if the deformation and the contact force are unreasonable;
step eight: performing compression simulation of the spring in a design state;
step nine: checking the result of the balance state;
step ten: simulating the strength working condition;
step eleven: and (5) carrying out post-treatment and evaluation on the result, and extracting stress or strain for evaluation according to the evaluation type of the working condition.
Further, the suspension system is built through a beam unit and a connector unit or through a spring unit with six degrees of freedom of rigidity;
the beam unit is used for simulating parts such as an auxiliary frame, a steering knuckle, a control arm and the like; the connector unit is used for simulating a rubber bushing, a spherical hinge or a spherical pin and a vibration damper.
Further, the fourth step is as follows:
(1) coupling joint points on a solid unit at the position of a control arm interface together by using RBE2, RBE3 or a beam unit at an inner point of a lower control arm, an outer point of the lower control arm, a stabilizer bar connecting point and a lower point of a shock absorber, and then connecting an RBE2 main point, an RBE3 slave point, a beam unit node and a connector unit of a simulation bush;
(2) and at the lower point of the spring, adopting a real spring pad and a real spring model, establishing a contact relation between the lower control arm and the spring channel, and finally coupling and connecting the upper side of the upper spring pad with the surface in contact with the vehicle body by using an RBE2 unit, wherein the upper point of the spring is not the position of the upper point of the spring in the system but the position of the free state of the spring.
And step four, the assembly relationship comprises the connection of the outer point of the lower control arm and the steering knuckle, the connection of the inner point of the lower control arm and the auxiliary frame, the connection of the lower point of the lower control arm shock absorber and the shock absorber, the connection of the lower point of the lower control arm stabilizer bar and the stabilizer bar, and the connection of the lower control arm and the spring channel.
Furthermore, the contact relationship between the lower control arm and the spring channel specifically comprises the contact between the surface of the lower control arm and the bottom surface of the lower spring pad, the contact between the lower end of the spring and the upper side of the lower spring pad, and the contact between the upper end of the spring and the lower side of the upper spring pad.
Further, the step five is as follows: the damper channel is simulated by a connector unit, and a corrected unit stiffness curve is determined by a buffer block stiffness curve, a suspension stiffness curve on the damper and a connection mode of the buffer block stiffness curve and the suspension stiffness curve; correcting a rigidity curve of the bushing to simulate preload at positions with the preload of the bushing, such as a front point of the auxiliary frame, a rear point of the auxiliary frame, a front point of the trailing arm and the like; when defining the material property of each component, all the simplified beam units and the spring bodies can be endowed with simple linear elastic material property, the lower control arm is endowed with linear elastic or elastic plastic material property according to the strength evaluation requirement, and the spring pad is endowed with special material property according to the characteristics of the material.
Further, step eight is specifically as follows: through the independent calculation and analysis of the spring, the displacement of the upper point of the spring relative to the lower point in 3 translation directions and the rotation angles in 3 rotation directions are measured, the 6 data are set as the displacement boundary conditions of 6 degrees of freedom of the RBE2 unit main point on the upper side of the upper spring pad, and calculation is submitted to obtain the system analysis results of the pre-compression and the suspension of the spring in the design state.
Further, the ninth step is as follows: checking whether the calculation results of the preload forces of the shock absorber channel, the spring channel and the bush are normal, whether the deformation of the spring channel is normal, whether the contact force of each contact surface is normal, whether the forces and the moments of all the bushes in all directions are normal, and returning to the setting of the checking model if the data are abnormal until all the checking items are normal.
Further, the step ten is specifically as follows: releasing the wheel center constraint, applying a strength working condition load at the wheel center, and submitting calculation for strength simulation; and (4) checking results after the calculation is finished, wherein the results comprise deformation, the forces of all channels and interfaces and contact forces, particularly paying attention to checking whether the distribution of the shock absorber channel and the spring channel to the vertical load is normal or not, and returning to the setting of checking parameters if the results are abnormal.
Compared with the prior art, the invention has the following advantages:
according to the method for improving the simulation analysis precision of the lower control arm spring, the calculation precision of the position of the matching surface of the lower control arm spring can be improved by improving the modeling method and the simulation process near the hard point of the control arm spring, so that the strength and the durability of the lower control arm spring can be judged more accurately.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings used in the detailed description or the prior art description will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
FIG. 1 is a schematic view of a lower control arm;
FIG. 2 is a schematic flow chart illustrating a method for improving the accuracy of simulation analysis of the unsprung control arm according to the present invention;
FIG. 3 is a schematic diagram of a model for constructing a suspension system;
FIG. 4 is a schematic diagram of spring channel modeling.
In the figure: the device comprises a lower control arm outer point 1, a shock absorber lower point 2, a spring lower point 3, a stabilizer bar connecting rod lower point 4 and a lower control arm inner point 5.
Detailed Description
For clearly and completely describing the technical scheme and the specific working process thereof, the specific implementation mode of the invention is as follows by combining the drawings in the specification:
in the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean 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, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Moreover, various embodiments or examples and features of various embodiments or examples described in this specification can be combined and combined by one skilled in the art without being mutually inconsistent.
A method for improving simulation analysis precision of a control arm under a spring specifically comprises the following steps:
the method comprises the following steps: building a suspension system model;
step two: carrying out solid grid division on the lower control arm, the spring and the spring pad, wherein the spring and the spring pad use a geometric model in a free state;
step three: leading the divided three-dimensional entity grids into the suspension system model built in the step one;
step four: defining the assembly and contact relationship of the control arm and the suspension system;
step five: defining equivalent stiffness, bushing preload and material properties of the damper channel;
step six: defining a preliminary constraint: restraining front and rear points of the auxiliary frame, a front point of the trailing arm, an upper point of the shock absorber, an upper point of the spring and a wheel center;
step seven: performing assembly simulation of the spring and the spring pad, observing whether the deformation and the contact force of the result are reasonable or not, and returning to check the model definition if the deformation and the contact force are unreasonable;
step eight: performing compression simulation of the spring in a design state;
step nine: checking the balance state result;
step ten: simulating the strength working condition;
step eleven: and (5) carrying out post-treatment and evaluation on the result, and extracting stress or strain for evaluation according to the evaluation type of the working condition.
Further, the suspension system is built through a beam unit and a connector unit or through a spring unit with six degrees of freedom;
the beam unit is used for simulating parts such as an auxiliary frame, a steering knuckle, a control arm and the like; the connector unit is used for simulating a rubber bushing, a spherical hinge or a spherical pin and a vibration damper.
Further, the fourth step is as follows:
(1) coupling joint points on a solid unit at the position of a control arm interface together by using RBE2, RBE3 or a beam unit at an inner point of a lower control arm, an outer point of the lower control arm, a stabilizer bar connecting point and a lower point of a shock absorber, and then connecting an RBE2 main point, an RBE3 slave point, a beam unit node and a connector unit of a simulation bush;
(2) and at the lower point of the spring, adopting a real spring pad and a real spring model, establishing a contact relation between the lower control arm and the spring channel, and finally coupling and connecting the upper side of the upper spring pad with the surface in contact with the vehicle body by using an RBE2 unit, wherein the upper point of the spring is not the position of the upper point of the spring in the system but the position of the free state of the spring.
And step four, the assembly relationship comprises the connection of the outer point of the lower control arm and the steering knuckle, the connection of the inner point of the lower control arm and the auxiliary frame, the connection of the lower point of the lower control arm shock absorber and the shock absorber, the connection of the lower point of the lower control arm stabilizer bar and the stabilizer bar, and the connection of the lower control arm and the spring channel.
Furthermore, the contact relationship between the lower control arm and the spring channel specifically comprises the contact between the surface of the lower control arm and the bottom surface of the lower spring pad, the contact between the lower end of the spring and the upper side of the lower spring pad, and the contact between the upper end of the spring and the lower side of the upper spring pad.
Further, the step five is as follows: the damper channel is simulated by a connector unit, and a corrected unit stiffness curve is determined by a buffer block stiffness curve, a suspension stiffness curve on the damper and a connection mode of the buffer block stiffness curve and the suspension stiffness curve; correcting a rigidity curve of the bushing to simulate preload at positions with the preload of the bushing, such as a front point of the auxiliary frame, a rear point of the auxiliary frame, a front point of the trailing arm and the like; when defining the material property of each component, all the simplified beam units and the spring bodies can be endowed with simple linear elastic material property, the lower control arm is endowed with linear elastic or elastic plastic material property according to the strength evaluation requirement, and the spring pad is endowed with special material property according to the characteristics of the material.
Further, step eight is specifically as follows: through the independent calculation and analysis of the spring, the displacement of the upper point of the spring relative to the lower point in 3 translation directions and the rotation angles in 3 rotation directions are measured, the 6 data are set as the displacement boundary conditions of 6 degrees of freedom of the RBE2 unit main point on the upper side of the upper spring pad, and calculation is submitted to obtain the system analysis results of the pre-compression and the suspension of the spring in the design state.
Further, the ninth step is as follows: checking whether the calculation results of the preload force of the shock absorber channel, the spring channel and the bush are normal, whether the deformation of the spring channel is normal, whether the contact force of each contact surface is normal, whether the forces and the moments of all the directions of the bush are normal, and returning to the setting of the checking model if the data are abnormal until all the checking items are normal.
Further, the step ten is specifically as follows: releasing the wheel center constraint, applying a strength working condition load at the wheel center, and submitting calculation for strength simulation; and (4) checking results after the calculation is finished, wherein the results comprise deformation, the forces of all channels and interfaces and contact forces, particularly paying attention to checking whether the distribution of the shock absorber channel and the spring channel to the vertical load is normal or not, and returning to the setting of checking parameters if the results are abnormal.
Example 1
As shown in fig. 2, which is a flowchart of a method for improving accuracy of simulation analysis of a control arm under a spring according to this embodiment, the method specifically includes the following steps:
step 1: as shown in fig. 3, a simplified suspension system is built by using a beam unit and a connector unit or a spring type unit capable of defining the rigidity of 6 degrees of freedom;
the beam unit is used for simulating parts such as an auxiliary frame, a steering knuckle and a control arm, and the connector is used for simulating a rubber bushing, a spherical hinge or a spherical pin and a shock absorber;
step 2: dividing a solid grid of a lower control arm, a spring and a spring pad, wherein the spring and the spring pad use a geometric model in a free state;
and 3, step 3: leading the divided three-dimensional entity grids into a built simplified suspension system model;
and 4, step 4: defining the assembly and contact relation between a control arm and a suspension system, wherein the connection relation comprises the connection of a lower control arm outer point and a steering knuckle, the connection of a lower control arm inner point and an auxiliary frame, the connection of a lower control arm shock absorber lower point and a shock absorber, the connection of a lower control arm stabilizer bar and a stabilizer bar, and the connection of the lower control arm and a spring channel;
the specific operation is as follows: (1) coupling joint points on a solid unit at the position of a control arm interface together by using an RBE2, an RBE3 or a beam unit at an inner point of a lower control arm, an outer point of the lower control arm, a stabilizer bar connecting point and a lower point of a shock absorber, and then connecting an RBE2 main point, an RBE3 slave point, a beam unit node and a connector unit of a simulation bush; (2) at the point below the spring, a real spring cushion and a spring model are used instead of a traditional RBE3 unit, and a contact relation between the lower control arm and the spring channel is established, specifically, the contact between the surface of the lower control arm and the bottom surface of the lower spring cushion, the contact between the lower end of the spring and the upper side of the lower spring cushion, the contact between the upper end of the spring and the lower side of the upper spring cushion are included, and finally, the surface of the upper spring cushion, which is contacted with the vehicle body, is coupled and connected by an RBE2 unit, as shown in FIG. 4; the spring upper point is not the position of the spring upper point in the system at this time, but the position of the spring in a free state.
And 5, step 5: defining equivalent stiffness, bushing preload and material properties of the damper channel;
the damper channel is simulated by using a connector unit, and a corrected unit stiffness curve is determined by a buffer block stiffness curve, a suspension stiffness curve on the damper and a connection mode of the buffer block stiffness curve and the suspension stiffness curve. The method comprises the following steps that positions with bushing preloading are arranged at a front point of an auxiliary frame, a rear point of the auxiliary frame, a front point of a trailing arm and the like, and a rigidity curve of a bushing is corrected to simulate preloading; when defining the material attribute of each component, all the simplified beam units and the spring entity can endow simple linear elastic material attribute, the lower control arm endows linear elastic or elastic plastic material attribute according to the strength evaluation requirement, and the spring pad endows special material attribute according to the characteristics of the material;
and 6, step 6: defining a preliminary constraint: restraining front and rear points of the auxiliary frame, a front point of the trailing arm, an upper point of the shock absorber, an upper point of the spring and a wheel center;
and 7, step 7: performing assembly simulation of the spring and the spring pad, observing whether the deformation and the contact force of the result are reasonable or not, and returning to check the definition of the model if the deformation and the contact force are unreasonable;
and 8, step 8: performing compression simulation of the spring in a design state: firstly, through independent calculation and analysis of the spring, the displacement of the upper point of the spring relative to the lower point in 3 translation directions and the rotation angle in 3 rotation directions are measured, the 6 data are set as the displacement boundary conditions of 6 degrees of freedom of the main point of the RBE2 unit on the upper side of the upper spring pad, and calculation is submitted to obtain the system analysis result of precompression and suspension of the spring in the design state;
step 9: checking the balance state result: checking whether the calculation results of the preload forces of the shock absorber channel, the spring channel and the bush are normal, whether the deformation of the spring channel is normal, whether the contact force of each contact surface is normal, whether the forces and the moments of all the bushes in all directions are normal or not, and returning to the setting of the checking model if the data are abnormal until all the checking items are normal;
step 10: simulation of strength working conditions: releasing the wheel center constraint, applying a strength working condition load at the wheel center, and submitting calculation for strength simulation; after the calculation is finished, result checking is carried out, wherein the result checking comprises deformation, forces of all channels and interfaces and contact forces, whether the distribution of the shock absorber channel and the spring channel to the vertical load is normal or not is checked by special attention, and if the result is abnormal, checking parameter setting is returned;
and 11, step 11: and (5) carrying out post-treatment and evaluation on the result, and extracting stress or strain for evaluation according to the evaluation type of the working condition.
Through the steps, the process of improving the simulation analysis precision of the lower control arm of the spring is completed, and the calculation precision of the position of the spring matching surface of the lower control arm is improved, so that the strength and the durability of the lower control arm are judged more accurately.
The principle of the method for improving the simulation analysis precision of the under-spring control arm of the embodiment is as follows:
and (3) stress calculation accuracy: the stress distribution below the spring pad is mainly influenced by two factors, 1, the load of the spring channel; 2, structural stiffness distribution near the spring pad in contact with the control arm. In the method, the system modeling, the absorber stiffness parameter correction, the bushing preload stiffness parameter correction, the spring assembly simulation and the design compression preload simulation can be carried out, so that the load of the spring channel can be obtained more accurately. The spring channel does not use simplified units, and uses a solid grid instead, so that the problem that the rigidity of a structure near a spring pad cannot be accurately described by using a common RBE3 unit can be avoided, and a more accurate stress result can be obtained. In one example, the stress difference between the algorithm and the traditional RBE3 inertia release algorithm is between 50MPa and 150 MPa.
Fatigue life calculation accuracy: the fatigue damage and the stress are in an exponential relationship, the change of the stress with smaller amplitude can cause the change of the fatigue life with larger amplitude, and the calculation precision of the stress is improved, namely the calculation precision of the fatigue is improved.
The preferred embodiments of the present invention have been described in detail with reference to the accompanying drawings, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications can be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.
It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.
In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.
Claims (9)
1. A method for improving simulation analysis precision of a control arm under a spring is characterized by comprising the following steps:
the method comprises the following steps: building a suspension system model;
step two: carrying out solid grid division on the lower control arm, the spring and the spring pad, wherein the spring and the spring pad use a geometric model in a free state;
step three: leading the divided three-dimensional entity grids into the suspension system model built in the step one;
step four: defining the assembly and contact relationship of the control arm and the suspension system;
step five: defining equivalent stiffness, bushing preload and material properties of the damper channel;
step six: defining a preliminary constraint: restraining front and rear points of the auxiliary frame, a front point of the trailing arm, an upper point of the shock absorber, an upper point of the spring and a wheel center;
step seven: performing assembly simulation of the spring and the spring pad, observing whether the deformation and the contact force of the result are reasonable or not, and returning to check the model definition if the deformation and the contact force are unreasonable;
step eight: performing compression simulation of the spring in a design state;
step nine: checking the result of the balance state;
step ten: simulating the strength working condition;
step eleven: and (5) carrying out post-treatment and evaluation on the result, and extracting stress or strain for evaluation according to the evaluation type of the working condition.
2. The method for improving the simulation analysis precision of the unsprung control arm according to claim 1, wherein the suspension system is constructed through a beam unit and a connector unit or through a spring type unit with six degrees of freedom stiffness in the first step;
the beam unit is used for simulating an auxiliary frame, a steering knuckle and a control arm part; the connector unit is used for simulating a rubber bushing, a spherical hinge or a spherical pin and a vibration damper.
3. The method for improving the simulation analysis accuracy of the under-spring control arm according to claim 1, wherein the fourth step is as follows:
(1) coupling joint points on an entity unit at the position of a control arm interface together by using RBE2, RBE3 or a beam unit at an inner point of a lower control arm, an outer point of the lower control arm, a stabilizer bar connecting point and a lower point of a vibration damper, and then connecting an RBE2 main point, an RBE3 slave point, a beam unit node and a connector unit of a simulation bush;
(2) and at the lower point of the spring, adopting a real spring cushion set spring model, establishing a contact relation between the lower control arm and the spring channel, and finally coupling and connecting the upper side of the upper spring cushion with the surface of the vehicle body by using an RBE2 unit, wherein the upper point of the spring is not the position of the upper point of the spring in the system but the position of the spring in a free state.
4. The method of claim 1, wherein the assembling relationship of step four includes connecting the outer point of the lower control arm to the knuckle, connecting the inner point of the lower control arm to the subframe, connecting the lower point of the lower control arm damper to the damper, connecting the lower point of the lower control arm stabilizer bar to the stabilizer bar, and connecting the lower control arm to the spring channel.
5. The method as claimed in claim 1, wherein the contact relationship between the lower control arm and the spring channel includes a contact between the surface of the lower control arm and the bottom surface of the lower spring pad, a contact between the lower end of the spring and the upper side of the lower spring pad, and a contact between the upper end of the spring and the lower side of the upper spring pad.
6. The method for improving the simulation analysis accuracy of the unsprung control arm according to claim 1, wherein the step five is as follows: the damper channel is simulated by a connector unit, and a corrected unit stiffness curve is determined by a buffer block stiffness curve, a suspension stiffness curve on the damper and a connection mode of the buffer block stiffness curve and the suspension stiffness curve; at the front point of the auxiliary frame and the rear point of the auxiliary frame, the front point of the trailing arm has the position of the pre-load of the bush, and the stiffness curve of the bush is corrected to simulate the pre-load; when defining the material property of each component, all the simplified beam units and the spring bodies can be endowed with simple linear elastic material property, the lower control arm is endowed with linear elastic or elastic plastic material property according to the strength evaluation requirement, and the spring pad is endowed with special material property according to the characteristics of the material.
7. The method for improving the simulation analysis accuracy of the unsprung control arm according to claim 1, wherein the eighth step is as follows: through the independent calculation and analysis of the spring, the displacement of the upper point of the spring relative to the lower point in 3 translation directions and the rotation angles in 3 rotation directions are measured, the 6 data are set as the displacement boundary conditions of 6 degrees of freedom of the RBE2 unit main point on the upper side of the upper spring pad, and calculation is submitted to obtain the system analysis results of the pre-compression and the suspension of the spring in the design state.
8. The method for improving the simulation analysis accuracy of the under-spring control arm according to claim 1, wherein the nine steps are as follows: checking whether the calculation results of the preload forces of the shock absorber channel, the spring channel and the bush are normal, whether the deformation of the spring channel is normal, whether the contact force of each contact surface is normal, whether the forces and the moments of all the bushes in all directions are normal, and returning to the setting of the checking model if the data are abnormal until all the checking items are normal.
9. The method for improving the simulation analysis accuracy of the under-spring control arm according to claim 1, wherein the steps are as follows: releasing the wheel center constraint, applying a strength working condition load at the wheel center, and submitting calculation for strength simulation; and (4) checking results after the calculation is finished, wherein the results comprise deformation, forces of all channels and interfaces and contact force, particularly, checking whether the distribution of the vibration absorber channel and the spring channel to the vertical load is normal or not, and returning to the setting of checking parameters if the results are abnormal.
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| CN202210473720.4A Pending CN114943123A (en) | 2022-04-29 | 2022-04-29 | Method for improving simulation analysis precision of control arm under spring |
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