CN104019998A - Variable-rigidity virtual car body rigidity distribution method - Google Patents
Variable-rigidity virtual car body rigidity distribution method Download PDFInfo
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- CN104019998A CN104019998A CN201410272501.5A CN201410272501A CN104019998A CN 104019998 A CN104019998 A CN 104019998A CN 201410272501 A CN201410272501 A CN 201410272501A CN 104019998 A CN104019998 A CN 104019998A
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Abstract
The invention relates to a variable-rigidity virtual car body rigidity distribution method. The variable-rigidity virtual car body rigidity distribution method comprises the steps first, data are collected to determine the torsional rigidity and the offset frequency of a car body; second, the linear rigidity is obtained according to a classic car body torsional rigidity measuring method; third, the linear rigidity of a virtual car body is determined; fourth, an appropriate variable-rigidity elastic component is selected. Through the variable-rigidity virtual car body rigidity distribution method, the car body rigidity of the finished automobile body can be distributed to a quarter of the car body to obtain the linear rigidity of the virtual car body. The purpose that the rigidity of the virtual car body is variable can be achieved by selecting the appropriate elastic component. Technical support is provided for building of a suspension test bed used for simulating car body flexibility and the like.
Description
Technical field
The present invention relates to a kind of rigidity distribution method that car load body stiffness is distributed to part vehicle body, especially a kind of for 1/4th vehicle bodies, and the rigidity distribution method that can extend to 1/2nd vehicle bodies.
Background technology
Existing suspension testing table focuses mostly in suspension system close beta, there is not yet can simulated suspension mounting points body stiffness test unit, mostly tie point on suspension and test-bed are rigidly fixed, do not consider the flexibility of vehicle body, truth in this and suspension use procedure is not inconsistent, thereby cause in process of the test shock load excessive, on stand, mate index good be suspended in performance and requirement on real vehicle and differ far away, and then limited parts and synchronize and develop with car load.Under Rational Condition, should set up the suspension testing table that can simulate different body stiffness, try hard to make bench test can simulate more accurately real train test.
In order to simulate the flexibility of vehicle body, suspension should be installed on desirable rigid support by specific flexible member, before testing, reconcile the rigidity that flexible member reaches appointment, the rigidity of this flexible member is exactly the rigidity of virtual vehicle body.Consider that this testing table is for being generally 1/4th suspension testing tables, this just relates to a kind of method that car load body stiffness is distributed to part vehicle body of setting up.
Summary of the invention
The present invention seeks in order to determine the rigidity of virtual vehicle body, and provide a kind of stiffness variable virtual body stiffness distribution method.
Technical scheme of the present invention is: the virtual body stiffness distribution method of a kind of stiffness variable, it is characterized in that, and concrete steps are:
The first, collect data and determine body torsional rigdity and offset frequency ratio;
The second, according to classical body torsional rigdity measuring method, obtain line rigidity;
Three, determine virtual body line rigidity;
Four, select suitable change rigidity flexible member.
Above-mentionedly according to classical body torsional rigdity measuring method, obtain line rigidity:
To based on typical body torsional rigdity, test the computing formula of the body torsional rigdity obtaining:
（1）
Be deformed into the form of the ratio of power and displacement, i.e. line rigidity
:
(2)
In formula, W is body torsional rigdity, and F is augmentor applied force, and L1 is the distance at front suspension tie point place,
difference in height for front suspension left and right tie point;
Use line rigidity
characterize body torsional rigdity, and utilize measurement data in used for torsional rigidity test of vehicular process to calculate.
Above-mentioned definite virtual body line rigidity:
Its allocation step is: (1) is distributed body torsional rigdity to 1/4th vehicle bodies, obtains 1/4th body torsional rigdities; (2) 1/4th body torsional rigdities are converted into the line rigidity at 1/4th vehicle body places, and hypothesis: series connection before and after (1) body torsional rigdity, left and right is in parallel; (2) before and after, torsional rigidity is distributed with reference to the ratio of forward and backward suspension offset frequency, under this assumed condition, body torsional rigdity is assigned to 1/4th vehicle body places, obtains the line rigidity that this locates virtual vehicle body.
The change rigidity flexible member that above-mentioned selection is suitable: when determining the classification of flexible member and model, select to cover the change rigidity flexible member of different body stiffness, realize the virtual vehicle body of stiffness variable.
The invention has the beneficial effects as follows: the present invention, from classical body torsional rigdity measuring method, sets up a kind of body torsional rigdity distribution method, and determine virtual body stiffness, for setting up, comprise that the suspension testing table of simulation vehicle body flexibility provides technical support.In use, in order to adapt to the needs of different body stiffness, when determining the classification of flexible member and model, selection can cover the change rigidity flexible member of different body stiffness, has realized the virtual vehicle body of stiffness variable.
Accompanying drawing explanation
Fig. 1 is body torsional rigdity analysis of experiments sketch;
Fig. 2 is that left back 1/4th vehicle bodies are analyzed sketch.
Embodiment
Below in conjunction with accompanying drawing and instantiation example, the present invention is further illustrated.
A kind of rigidity distribution method that car load body stiffness is distributed to part vehicle body:
Collect data and determine body torsional rigdity and offset frequency ratio:
2, according to classical body torsional rigdity measuring method, obtain line rigidity:
Based on typical body torsional rigdity test, as shown in Figure 1, obtain the computing method of body torsional rigdity:
（1）
In formula, W is body torsional rigdity, and F is augmentor applied force, and L1 is the distance at front suspension tie point place,
difference in height for front suspension left and right tie point.
To formula (1) distortion, be rewritten as the form of the ratio of power and displacement, obtain:
(2)
Define a kind of new rigidity, i.e. line rigidity
.
3, determine virtual body line rigidity:
The line rigidity of considering to determine 1/4th vehicle body places, its analytical procedure is as follows:
(1) body torsional rigdity is distributed to 1/4th vehicle bodies, obtain 1/4th body torsional rigdities;
(2) 1/4th body torsional rigdities are converted into the line rigidity at 1/4th vehicle body places.
As shown in Figure 1, 2, by body torsional rigdity W be assigned as the first two/a body torsional rigdity X, rear 1/2nd body torsional rigdity Y, left front 1/4th body torsional rigdities
, right front 1/4th body torsional rigdities
, left back 1/4th body torsional rigdities
with right back 1/4th body torsional rigdities
.For body torsional rigdity, distribute and propose following two hypothesis:
1) series connection before and after body torsional rigdity, left and right is in parallel;
2) before and after, torsional rigidity is distributed with reference to the ratio of forward and backward suspension offset frequency.
Based on above-mentioned two hypothesis, can obtain:
（3）
（4）
（5）
（6）
Obtain left back 1/4th body torsional rigdities:
.
Left back 1/4th vehicle bodies are analyzed, as shown in Figure 2, in conjunction with aforementioned result, are obtained the line rigidity of left back 1/4th vehicle bodies:
（7）
By parameter corresponding in the parameter substitution formula (7) of left front 1/4th vehicle bodies, obtain the line rigidity of left front 1/4th vehicle bodies:
（8）
The line rigidity that formula (7) and the resulting line rigidity of formula (8) are virtual vehicle body, aforesaid method is body stiffness apportion design.
4, select suitable change rigidity flexible member.
When determining the classification of flexible member and model, selection can cover the change rigidity flexible member of different body stiffness, has realized the virtual vehicle body of stiffness variable.
Claims (4)
1. the virtual body stiffness distribution method of stiffness variable, is characterized in that, concrete steps are:
The first, collect data and determine body torsional rigdity and offset frequency ratio;
The second, according to classical body torsional rigdity measuring method, obtain line rigidity;
Three, determine virtual body line rigidity;
Four, select suitable change rigidity flexible member.
2. the virtual body stiffness distribution method of stiffness variable according to claim 1, is characterized in that: describedly according to classical body torsional rigdity measuring method, obtain line rigidity: the computing formula of the body torsional rigdity that will obtain based on typical body torsional rigdity test:
（1）
Be deformed into the form of the ratio of power and displacement, i.e. line rigidity
:
(2)
In formula, W is body torsional rigdity, and F is augmentor applied force, and L1 is the distance at front suspension tie point place,
difference in height for front suspension left and right tie point;
Use line rigidity
characterize body torsional rigdity, and utilize measurement data in used for torsional rigidity test of vehicular process to calculate.
3. the virtual body stiffness distribution method of stiffness variable according to claim 1, it is characterized in that: described definite virtual body line rigidity: its allocation step is: (1) is distributed body torsional rigdity to 1/4th vehicle bodies, obtains 1/4th body torsional rigdities; (2) 1/4th body torsional rigdities are converted into the line rigidity at 1/4th vehicle body places, and hypothesis: series connection before and after (1) body torsional rigdity, left and right is in parallel; (2) before and after, torsional rigidity is distributed with reference to the ratio of forward and backward suspension offset frequency, under this assumed condition, body torsional rigdity is assigned to 1/4th vehicle body places, obtains the line rigidity that this locates virtual vehicle body.
4. the virtual body stiffness distribution method of stiffness variable according to claim 1, it is characterized in that: the change rigidity flexible member that described selection is suitable: when determining the classification of flexible member and model, select to cover the change rigidity flexible member of different body stiffness, realize the virtual vehicle body of stiffness variable.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111159906A (en) * | 2019-12-31 | 2020-05-15 | 上海理工大学 | ADAMS secondary development-based automobile suspension dynamic model building method |
| US10713400B2 (en) | 2017-04-23 | 2020-07-14 | Cmlabs Simulations Inc. | System and method for executing a simulation of a constrained multi-body system |
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| JPH0943109A (en) * | 1995-05-25 | 1997-02-14 | Hitachi Ltd | Device and method for testing vehicle |
| US5942673A (en) * | 1996-05-24 | 1999-08-24 | Hitachi, Ltd. | Vehicle testing system and testing method |
| CN101354319A (en) * | 2008-09-10 | 2009-01-28 | 奇瑞汽车股份有限公司 | Simple tool for measuring automobile suspension elastic characteristic and measuring method thereof |
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| US20120260725A1 (en) * | 2009-08-26 | 2012-10-18 | Joon-Kyu Lee | Test Stand Having a Vibration Damper |
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| 洪超: "某越野车刚柔耦合建模及动力学仿真", 《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》, no. 6, 15 June 2013 (2013-06-15), pages 035 - 141 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10713400B2 (en) | 2017-04-23 | 2020-07-14 | Cmlabs Simulations Inc. | System and method for executing a simulation of a constrained multi-body system |
| CN111159906A (en) * | 2019-12-31 | 2020-05-15 | 上海理工大学 | ADAMS secondary development-based automobile suspension dynamic model building method |
| CN111159906B (en) * | 2019-12-31 | 2023-06-16 | 上海理工大学 | ADAMS secondary development-based automobile suspension dynamic model building method |
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