CN104019998B - Stiffness variable virtual body stiffness distribution method - Google Patents
Stiffness variable virtual body stiffness distribution method Download PDFInfo
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- CN104019998B CN104019998B CN201410272501.5A CN201410272501A CN104019998B CN 104019998 B CN104019998 B CN 104019998B CN 201410272501 A CN201410272501 A CN 201410272501A CN 104019998 B CN104019998 B CN 104019998B
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Abstract
The present invention relates to a kind of stiffness variable virtual body stiffness distribution method, the steps include: 1, collect data and determine body torsional rigdity and offset frequency ratio；2, Line stiffness is obtained according to classical body torsional rigdity measuring method；3, virtual vehicle body Line stiffness is determined: 4, select suitable variation rigidity flexible member.Utilize this method, car load body stiffness can be distributed to 1/4th vehicle bodies, and obtain virtual vehicle body Line stiffness.And by selecting suitable flexible member to realize the variable rigidity of virtual vehicle body.Include that simulating the flexible suspension testing stand of vehicle body provides technical support for setting up.
Description
Technical field
The present invention relates to a kind of rigidity distribution method being allocated by car load body stiffness to part vehicle body, especially one
Plant for 1/4th vehicle bodies, and the rigidity distribution method that can extend to 1/2nd vehicle bodies.
Background technology
Existing suspension testing stand focuses mostly in suspension system close beta, and there is not yet can simulated suspension mount point vehicle body
The assay device of rigidity, rigidly fixes junction point on suspension with test-bed mostly, does not consider the flexibility of vehicle body, this and suspension
Truth during use is not inconsistent, thus causes shock loading in process of the test excessive, stand mates index good
It is suspended in performance on real vehicle to differ farther out with requirement, and then limits parts and car load synchronous development.Should build under Rational Condition
A vertical suspension testing stand that can simulate different body stiffness, tries hard to enable bench test to simulate real vehicle examination the most accurately
Test.
In order to simulate the flexibility of vehicle body, suspension should be installed on preferable rigid support by specific flexible member,
Reconciling the rigidity that flexible member reaches to specify before testing, the rigidity of this flexible member is exactly the rigidity of virtual vehicle body.Examine
Considering to this testing stand is generally 1/4th suspension testing stands, and this relates to set up one by car load body stiffness to part car
The method that status is joined.
Summary of the invention
The invention aims to determine the rigidity of virtual vehicle body, and a kind of stiffness variable virtual body stiffness distribution is provided
Method.
The technical scheme is that a kind of stiffness variable virtual body stiffness distribution method, it is characterised in that specifically walk
Suddenly it is:
The first, collect data and determine body torsional rigdity and offset frequency ratio；
The second, Line stiffness is obtained according to classical body torsional rigdity measuring method；
3rd, virtual vehicle body Line stiffness is determined；
4th, suitable variation rigidity flexible member is selected.
Above-mentioned obtain Line stiffness according to classical body torsional rigdity measuring method:
The computing formula of body torsional rigdity that will obtain based on the test of typical body torsional rigdity:
(1)
It is deformed into the form of power and the ratio of displacement, i.e. Line stiffness:
(2)
In formula, W is body torsional rigdity, the power that F is applied by augmentor, and L1 is the distance at front suspension junction point,
Difference in height for front suspension left and right junction point；
Use Line stiffnessCharacterize body torsional rigdity, and measurement data calculates during utilizing torsional rigidity test of vehicular
Arrive.
Above-mentioned determine virtual vehicle body Line stiffness:
Its allocation step is: body torsional rigdity is distributed by (1) to 1/4th vehicle bodies, obtains 1/4th vehicle bodies and reverses
Rigidity；(2) 1/4th body torsional rigdities are converted into the Line stiffness at 1/4th vehicle bodies, and assume: (1) vehicle body reverses
Rigidity tandem, left and right is in parallel；(2) before and after, torsional rigidity is allocated with reference to the ratio of forward and backward suspension offset frequency, it is assumed herein that
Under the conditions of, body torsional rigdity is assigned at 1/4th vehicle bodies, obtains the Line stiffness of virtual vehicle body at this.
Above-mentioned selection suitable variation rigidity flexible member: when determining classification and the model of flexible member, selects to cover not
Variation rigidity flexible member with body stiffness, it is achieved 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 car
Body torsional rigidity distribution method, and determine virtual body stiffness, include that simulating the flexible suspension testing stand of vehicle body provides for setting up
Technical support.In use, in order to adapt to the needs of different body stiffness, classification and the model of flexible member are being determined
Time, select to cover the variation rigidity flexible member of different body stiffness, i.e. achieve 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 analyze sketch.
Detailed description of the invention
The present invention is further illustrated with instantiation example below in conjunction with the accompanying drawings.
A kind of rigidity distribution method that car load body stiffness is allocated to part vehicle body:
Collect data and determine that body torsional rigdity and offset frequency compare:
2, Line stiffness is obtained according to classical body torsional rigdity measuring method:
Test based on typical body torsional rigdity, as it is shown in figure 1, obtain the computational methods of body torsional rigdity:
(1)
In formula, W is body torsional rigdity, the power that F is applied by augmentor, and L1 is the distance at front suspension junction point,
Difference in height for front suspension left and right junction point.
Formula (1) is deformed, is rewritten as the form of power and the ratio of displacement, obtains:
(2)
Define a kind of new rigidity, i.e. Line stiffness。
3, virtual vehicle body Line stiffness is determined:
Considering to determine the Line stiffness at 1/4th vehicle bodies, 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 stiffness at 1/4th vehicle bodies.
As shown in Figure 1, 2, body torsional rigdity W is assigned as front 1/2nd body torsional rigdity X, rear 1/2nd cars
Body torsional rigidity Y, left front 1/4th body torsional rigdities, right front 1/4th body torsional rigdities, left back 1/4th
Body torsional rigdityWith 1/4th body torsional rigdity behind the right side.Following two vacations are proposed for body torsional rigdity distribution
If:
1) body torsional rigdity tandem, left and right is in parallel；
2) before and after, torsional rigidity is allocated with reference to the ratio of forward and backward suspension offset frequency.
Based on above-mentioned two it is assumed that can obtain:
(3)
(4)
(5)
(6)
Obtain left back 1/4th body torsional rigdities:。
Left back 1/4th vehicle bodies are analyzed, as in figure 2 it is shown, combine aforementioned result, obtain left back 1/4th cars
The Line stiffness of body:
(7)
Replace parameter corresponding in formula (7) by the parameter of left front 1/4th vehicle bodies, obtain left front 1/4th vehicle bodies
Line stiffness:
(8)
The Line stiffness of the most virtual vehicle body of Line stiffness obtained by formula (7) and formula (8), the i.e. body stiffness of aforesaid method distributes
Method.
4, suitable variation rigidity flexible member is selected.
When determining classification and the model of flexible member, select to cover the variation rigidity elasticity unit of different body stiffness
Part, i.e. achieves the virtual vehicle body of stiffness variable.
Claims (3)
1. a stiffness variable virtual body stiffness distribution method, it is characterised in that concretely comprise the following steps:
The first, collect data and determine body torsional rigdity and offset frequency ratio；
The second, Line stiffness is obtained according to classical body torsional rigdity measuring method；
3rd, virtual vehicle body Line stiffness is determined: its allocation step is: body torsional rigdity is distributed by (1) to 1/4th vehicle bodies,
Obtain 1/4th body torsional rigdities；(2) line being converted at 1/4th vehicle bodies by 1/4th body torsional rigdities is firm
Degree；And assume: 1) body torsional rigdity tandem, left and right is in parallel；2) before and after, torsional rigidity is with reference to the ratio of forward and backward suspension offset frequency
Value is allocated, it is assumed herein that under the conditions of, body torsional rigdity is assigned at 1/4th vehicle bodies, obtains virtual vehicle body at this
Line stiffness；
4th, suitable variation rigidity flexible member is selected.
Stiffness variable the most according to claim 1 virtual body stiffness distribution method, it is characterised in that: described according to classics
Body torsional rigdity measuring method obtain Line stiffness: will reverse just based on the vehicle body that the test of typical body torsional rigdity obtains
The computing formula of degree:
(1)
It is deformed into the form of power and the ratio of displacement, i.e. Line stiffness:
(2)
In formula, W is body torsional rigdity, the power that F is applied by augmentor, L1For the distance at front suspension junction point,For front
The difference in height of suspension left and right junction point；
Use Line stiffnessCharacterize body torsional rigdity, and measurement data is calculated during utilizing torsional rigidity test of vehicular.
Stiffness variable the most according to claim 1 virtual body stiffness distribution method, it is characterised in that: described selection is suitable
Variation rigidity flexible member: when determining classification and the model of flexible member, select to cover the variation rigidity bullet of different body stiffness
Property element, it is achieved the virtual vehicle body of stiffness variable.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US10713400B2 (en) | 2017-04-23 | 2020-07-14 | Cmlabs Simulations Inc. | System and method for executing a simulation of a constrained multi-body system |
| 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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| JPH0943109A (en) * | 1995-05-25 | 1997-02-14 | Hitachi Ltd | Device and method for testing vehicle |
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| 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 |
| CN201983936U (en) * | 2010-12-21 | 2011-09-21 | 上海工程技术大学 | Performance test rack for automobile suspension |
| CN201993240U (en) * | 2010-12-28 | 2011-09-28 | 中国第一汽车集团公司 | Novel test fixture of car suspension system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009038849B4 (en) * | 2009-08-26 | 2011-07-21 | Horiba Europe GmbH, 64293 | Test bench with vibration absorber |
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Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101354319B (en) * | 2008-09-10 | 2011-01-26 | 奇瑞汽车股份有限公司 | Simple tool for measuring automobile suspension elastic characteristic and measuring method thereof |
| CN201983936U (en) * | 2010-12-21 | 2011-09-21 | 上海工程技术大学 | Performance test rack for automobile suspension |
| CN201993240U (en) * | 2010-12-28 | 2011-09-28 | 中国第一汽车集团公司 | Novel test fixture of car suspension system |
Non-Patent Citations (1)
| Title |
|---|
| 某越野车刚柔耦合建模及动力学仿真;洪超;《中国优秀硕士学位论文全文数据库 工程科技Ⅱ辑》;20130615(第6期);C035-141 * |
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