CN115718954A - CATIA software-based method and system for simulating side-tipping working condition of rear axle with leaf spring and storage - Google Patents
CATIA software-based method and system for simulating side-tipping working condition of rear axle with leaf spring and storage Download PDFInfo
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- CN115718954A CN115718954A CN202211459830.1A CN202211459830A CN115718954A CN 115718954 A CN115718954 A CN 115718954A CN 202211459830 A CN202211459830 A CN 202211459830A CN 115718954 A CN115718954 A CN 115718954A
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Abstract
The invention discloses a method, a system and storage for simulating a side-tipping working condition of a rear axle with a plate spring based on CATIA software, and mainly relates to the field of motion simulation of the rear axle with the plate spring of a light vehicle. The method comprises the following steps: inputting vehicle type parameters and a roll degree value; applying size and formula constraints to related parameters by using a CATIA sketch and outputting a leaf spring center point trajectory line; building a simulation model of a side-tipping working condition; determining an input angle of a side-tipping working condition; outputting the tire envelope and the rod system envelope through the model; and performing DMU gap checking according to the obtained model and the envelope. The invention has the beneficial effects that: the simulation of the side-tipping working condition of the rear axle is realized, and the simulation of various side-tipping angles can be carried out.
Description
Technical Field
The invention relates to the field of motion simulation of a light vehicle rear axle with a plate spring, in particular to a method, a system and storage for simulating a side-tipping working condition of the rear axle with the plate spring based on CATIA software.
Background
Suspension is a generic term for devices that provide a resilient connection between a wheel (or axle) and a vehicle frame (or body) and that are capable of transferring loads, dampening shocks, damping vibrations, and adjusting the position of the vehicle body. The suspension has the main functions of transmitting all forces and moments acting between wheels and a frame, relieving the impact of an uneven road on a vehicle body, attenuating the vibration of a bearing system caused by the impact and ensuring the running smoothness of the vehicle.
Under the development trend of light weight and material saving of automobiles, in a plate spring suspension commonly adopted on a light automobile, a plurality of novel plate springs with variable cross sections, gradually-changed rigidity and the like gradually replace a plurality of common plate springs, and are widely applied due to excellent performance.
In the process of developing a light vehicle leaf spring configuration suspension with an integral rear axle, for the motion simulation of the rear axle, only the motion simulation of flat jump is needed in the past, the building of a simulation model of a side-tipping working condition is lacked, the side-tipping working condition of the rear axle needs to be manually placed when the tire envelope and the rod system envelope are output, and the work is complicated.
Disclosure of Invention
In order to solve the problems, the invention provides a simulation method and a system for the roll working condition of a rear axle with a leaf spring based on CATIA software, and a simulation model for the roll working condition is realized by storage without manual input position.
In order to achieve the purpose, the invention is realized by the following technical scheme: the method comprises the following steps: inputting vehicle type parameters and a roll degree value; applying formula constraint and constraint pairs of sizes to related data by using a CATIA sketch and outputting a leaf spring center point trajectory line; building a side-tipping working condition simulation model of the rear axle with the plate spring; determining the input angle of the heeling working condition of the rear axle with the plate spring; outputting the tire envelope and the rod system envelope through the model; and performing DMU gap checking according to the obtained model and the envelope.
Preferably, the vehicle model parameter values comprise hard points of a benchmark vehicle model or a design vehicle model, leaf spring eye diameters and lifting lug length values.
Preferably, the data includes a hard point, a line segment, a lifting lug, a rolling lug, a main leaf spring, and a central point track of a main leaf spring, the data application size includes a hard point fixing constraint, a clamping length and lifting lug length constraint, and a rolling lug and main leaf tangent constraint, and the formula constraint includes: angle = arc length/radius.
Preferably, the track of the central point of the main leaf spring is specifically a track of the central point of the main leaf spring, wherein the track of the central point of the main leaf spring is obtained by constraining and driving the circular arc of the main leaf by the curvature radius to jump.
Preferably, the constraint pair comprises: the plate spring, the middle plane and the plate spring trajectory line are fixed parts and adopt fixed constraint pairs; a point-on-surface constraint pair is adopted by a point of a Y-direction stretching surface of a track line, wherein the center point of the rear axle is coincident with the middle plane, and the left side of the rear axle is coincident with the center point of the plate spring; the first auxiliary part is connected with the rear axle by a rotating pair; the second auxiliary part and the first auxiliary part adopt rhombic constraint and set values of an upward-jumping stroke and a downward-jumping stroke of the suspension; the second auxiliary part and the fixed part plate spring are restrained in a plane combination manner; the upper part and the lower part of the shock absorber are constrained in a rhombic shape; the upper part of the shock absorber and the leaf spring of the fixed part are constrained by a spherical surface; the lower part of the shock absorber and the rear axle with wheels are subjected to universal combination constraint; the constraint pair addition on the right side is the same as on the left side.
Preferably, the input angle for the roll condition is 5 degrees.
Preferably, the tire envelope and the rod system envelope output by the model are specifically tire envelopes and rod system envelopes under the working conditions of flat jump, side inclination, braking and the like output by the model.
Preferably, the DMU gap checking specifically includes adjusting coordinate values of hard points, and repeating the above steps until the gap arrangement requirement of the component is met, and the hard points are locked and issued.
A simulation system for the rolling working condition of a rear axle with a leaf spring based on CATIA software comprises a data acquisition module, a data processing module and a data output module, wherein the data acquisition module is used for acquiring and inputting vehicle type parameters and rolling degree values, the data processing module is used for processing the acquired vehicle type parameters and rolling degree values, and the data output module is used for outputting a simulation model for the rolling working condition of the rear axle with the leaf spring after data processing.
A storage medium for simulating a roll condition of a rear axle with a leaf spring based on CATIA software, the storage medium storing one or more programs, the one or more programs being executable by one or more processors to implement the method for simulating a roll condition of a rear axle with a leaf spring based on CATIA software according to any one of claims 1 to 8.
Compared with the prior art, the invention has the beneficial effects that:
on the basis of the conventional simulation practice, the method is based on a CATIA software simulation module, and simulation freedom degree conversion is carried out by adding auxiliary parts, so that the simulation of the side-tipping working condition of the rear axle is realized, various side-tipping angles can be simulated, position envelopes including the flat jump working condition and various side-tipping working conditions are output, and a design basis is provided for DMU clearance checking of series of vehicle types.
Drawings
Fig. 1 is a skeleton diagram of a leaf spring motion model of the present invention.
FIG. 2 is a simulated model diagram of the rear axle roll condition of the present invention.
FIG. 3 is a map of the auto-swept output tire envelope of the present invention.
Fig. 4 is a graph plotting the trace of the center point of the leaf spring of the present invention.
FIG. 5 is a drawing of the constraint pair of the components of the present invention.
FIG. 6 is a diagram of the tire envelope and damper envelope of the present invention.
FIG. 7 is a roll condition angle determination diagram of the present invention.
FIG. 8 is a parameter entry map of the present invention.
Reference numerals shown in the drawings:
1. a wheel; 2. a plate spring; 3. a shock absorber; 4. a second auxiliary part; 5. a first auxiliary part; 6. a rear axle; 7. a lug plate; 8. a central track point of the plate spring; 9. an upper limit; 10. no load; 11. a rear axle midpoint; 12. height constraint of the left wheel; 13. height constraint of the right wheel; 14. a midplane; 15. enveloping the left wheel; 16. right round envelope; 17. the shock absorber envelopes.
Detailed Description
The invention will be further illustrated with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
Example (b):
1. inputting parameters such as a leaf spring installation hard point, a lug plate hard point, a leaf spring eye diameter and the like of a post vehicle type or a design vehicle type as shown in FIG. 8;
2. as shown in fig. 3-4, the CATIA sketch is utilized to apply constraint to hard points, line segments, lifting lugs, rolling lugs and main leaf springs in the sketch so as to ensure that the arc length of the leaf spring is kept unchanged, and the curvature radius is used for constraining and driving to obtain the track of the central point of the main leaf of the leaf spring;
3. as shown in fig. 1-2 and 5, auxiliary parts are added to realize the conversion of the degree of freedom, height constraints are added to the two sides of the left wheel and the right wheel, and a roll condition model simulation model is realized, wherein the constraint pair is as follows:
(1) The plate spring, the middle plane and the plate spring track line are fixed parts, and a fixed constraint pair is adopted;
(2) A point-on-surface constraint pair is adopted by a point of a Y-direction stretching surface of a track line, wherein the center point of the rear axle is coincident with the middle plane, and the left side of the rear axle is coincident with the center point of the plate spring;
(3) The first auxiliary part is connected with the rear axle by adopting a revolute pair and used for converting the height freedom degree change of wheels at the left side and the right side;
(4) The second auxiliary part and the first auxiliary part adopt rhombic constraint to convert the height driving freedom degree of the left wheel and the right wheel;
(5) The second auxiliary part and the fixed part plate spring are subjected to plane combination constraint and are used for limiting the rotation of the rear axle;
(6) The upper part and the lower part of the shock absorber are constrained in a rhombic shape;
(7) The upper part of the shock absorber and the leaf spring of the fixed part are constrained by a spherical surface;
(8) The lower part of the shock absorber and the rear axle with wheels are subjected to universal combination constraint;
(9) The constraint pair addition on the right side is the same as that on the left side, and the values of the up-jump stroke and the down-jump stroke of the suspension are set in the diamond constraint in the step (4) (the up-jump is 112mm, and the down-jump is 70mm in the present case).
And the simulation model is built, and the model contains height constraint commands of wheels at the left side and the right side, so that the rolling simulation of the rear axle at any angle in a set stroke range can be realized.
4. Determining an input angle of a side-tipping working condition;
as shown in fig. 7, according to the practice of subjective evaluation and objective test, the maximum empirical angle of the roll condition is generally 5 degrees, and the present case is designed according to 5 degrees (at this time, the height of the left wheel center in the Z direction is 112mm, and the right wheel center jumps according to 2.5 mm).
5. As shown in fig. 6, the tire envelope and the rod system envelope under the working conditions of flat jump, roll, braking, etc. are output through the model.
6. And (4) performing DMU gap checking according to the obtained model and envelope, and if the DMU gap checking is not feasible, adjusting the hard point in time until the requirements are met.
Corresponding to the above method embodiment, the application provides a rolling condition simulation system of a rear axle with a leaf spring based on CATIA software, which comprises a data acquisition module, a data processing module and a data output module, wherein the data acquisition module is used for acquiring and inputting the vehicle model parameters and the rolling degree values, the data processing module is used for processing the acquired vehicle model parameters and the rolling degree values, and the data output module is used for outputting a rolling condition simulation model of the rear axle with the leaf spring after processing the data.
Corresponding to the above method embodiment, the present application further provides a storage medium for simulating the roll condition of the rear axle with leaf spring based on the CATIA software, where the storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the above method for externally connecting the storage medium.
The principle and the implementation of the present application are explained by applying specific examples in the present embodiment, and the above description of the embodiments is only used to help understanding the technical solution and the core idea of the present application. It should be noted that, for those skilled in the art, it is possible to make several improvements and modifications to the present application without departing from the principle of the present application, and such improvements and modifications also fall within the scope of the claims of the present application.
Claims (10)
1. A CATIA software-based method for simulating the side-tipping working condition of a rear axle with a leaf spring is characterized by comprising the following steps:
s1, inputting vehicle type parameters and a roll degree value;
s2, applying formula constraint and constraint pairs of the size to the data by using a CATIA sketch and outputting a leaf spring center point trajectory line;
s3, building a simulation model of the side-tipping working condition of the rear axle with the plate spring;
s4, determining the input angle of the side-tipping working condition of the rear axle with the plate spring;
s5, outputting tire envelopes and rod system envelopes through the model;
and S6, performing DMU gap checking according to the obtained model and the envelope.
2. The CATIA software-based simulation method for the roll condition of the rear axle with the leaf spring as recited in claim 1, wherein the vehicle model parameter values comprise hard points, leaf spring eye diameters and lifting lug length values of a benchmark vehicle model or a design vehicle model.
3. The CATIA software-based method for simulating the roll condition of the rear axle with the leaf spring as recited in claim 1, wherein the data includes a hard point, a line segment, a lifting lug, a rolling lug, a leaf spring, and a track of a central point of a leaf spring main piece, the data is subjected to a size including a hard point fixing constraint, a clamping length and lifting lug length constraint, and a rolling lug and main piece tangent constraint, and the formula constraint includes: angle = arc length/radius.
4. The CATIA software-based simulation method for the roll condition of the rear axle with the leaf spring as recited in claim 3, wherein the trajectory of the central point of the main leaf of the leaf spring is specifically a trajectory obtained by constraining and driving an arc of the main leaf to bounce by a curvature radius.
5. The method for simulating the roll condition of the rear axle with the leaf spring based on the CATIA software of claim 1, wherein the constraint pair comprises:
the plate spring, the middle plane and the plate spring trajectory line are fixed parts and adopt fixed constraint pairs;
the point of the center point of the rear axle and the middle plane, the point of the left side of the rear axle coinciding with the center point of the plate spring and the Y-direction stretching surface of the track line adopt point-on-surface constraint pairs;
the first auxiliary part is connected with the rear axle by a rotating pair;
the second auxiliary part and the first auxiliary part adopt rhombic constraint and set values of an upward-jumping stroke and a downward-jumping stroke of the suspension;
the second auxiliary part and the fixed part plate spring are restrained in a plane combination manner;
the upper part and the lower part of the shock absorber are constrained in a rhombic shape;
the upper part of the shock absorber and the leaf spring of the fixed part are constrained by a spherical surface;
the lower part of the shock absorber and the rear axle with wheels are subjected to universal combination constraint;
the constraint pair addition on the right side is the same as on the left side.
6. The CATIA software-based method for simulating the roll condition of the rear axle with the leaf spring according to claim 1, wherein the input angle of the roll condition is 5 degrees.
7. The method for simulating the rolling condition of the rear axle with the leaf spring based on the CATIA software as claimed in claim 1, wherein the outputting the tire envelope and the rod system envelope through the model is specifically outputting the tire envelope and the rod system envelope under the conditions of flat jump, rolling and braking through the model.
8. The CATIA software-based method for simulating the roll condition of the rear axle with the leaf spring according to claim 1, wherein the DMU clearance check is specifically performed by adjusting the coordinate value of the hard point, and the steps S1 to S5 are repeated until the clearance arrangement requirement of the parts is met, and the hard point is locked and issued.
9. A rolling condition simulation system of a rear axle with a leaf spring based on CATIA software is characterized by comprising a data acquisition module, a data processing module and a data output module, wherein the data acquisition module is used for acquiring and inputting vehicle type parameters and rolling degree values, the data processing module is used for processing the acquired vehicle type parameters and rolling degree values, and the data output module is used for outputting a rolling condition simulation model of the rear axle with the leaf spring after data processing.
10. A storage medium for simulating a roll condition of a rear axle with a leaf spring based on CATIA software, wherein one or more programs are stored, and the one or more programs are executable by one or more processors to implement the method for simulating a roll condition of a rear axle with a leaf spring based on CATIA software according to any one of claims 1 to 8.
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| CN202211459830.1A CN115718954A (en) | 2022-11-16 | 2022-11-16 | CATIA software-based method and system for simulating side-tipping working condition of rear axle with leaf spring and storage |
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| CN202211459830.1A CN115718954A (en) | 2022-11-16 | 2022-11-16 | CATIA software-based method and system for simulating side-tipping working condition of rear axle with leaf spring and storage |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116383973A (en) * | 2023-06-05 | 2023-07-04 | 江铃汽车股份有限公司 | CATIA-based light truck wheel single-side runout checking method and system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116383973A (en) * | 2023-06-05 | 2023-07-04 | 江铃汽车股份有限公司 | CATIA-based light truck wheel single-side runout checking method and system |
| CN116383973B (en) * | 2023-06-05 | 2023-09-01 | 江铃汽车股份有限公司 | CATIA-based light truck wheel single-side runout checking method and system |
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