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Drop test single-degree-of-freedom vehicle model-based vehicle parameter identification method

A vehicle model and vehicle parameter technology, applied in the field of vehicle parameter identification, can solve the problems of high cost, expensive four-channel system test bench, and affecting ride comfort

Active Publication Date: 2013-05-01
常州万安汽车部件科技有限公司
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Problems solved by technology

[0004] The three modal parameters are very important, because the modal parameters are the basis for identifying the physical parameters. In addition, the modal parameters can also be directly used to evaluate the car’s ride comfort and other performances. If its vertical natural frequency and human If their own natural frequency is very close, it will seriously affect the ride comfort
The disadvantage of this method is that the four-channel system test bench is very expensive, only a few large companies, research institutes or schools have this kind of equipment, and the cost of a single experiment is also very expensive

Method used

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  • Drop test single-degree-of-freedom vehicle model-based vehicle parameter identification method

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Embodiment Construction

[0032] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to define the protection scope of the present invention more clearly.

[0033] see figure 1 , the embodiment of the present invention includes:

[0034] A vehicle parameter identification method based on a drop test single-degree-of-freedom vehicle model, comprising the following steps:

[0035] 1) Set at least 6 measuring points on the vehicle, the first measuring point and the second measuring point are respectively set at the maximum distance from both sides of the body center of mass, and the third measuring point is set at the distance between the longitudinal centerline of the body and the front axle of the body At the intersection, the fourth measuring point is set at the tail of the longitudinal centerline of ...

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Abstract

The invention discloses a drop test single-degree-of-freedom vehicle model-based vehicle parameter identification method, which comprises the following steps of: setting measurement points on a vehicle; identifying intrinsic frequencies of the vehicle under a no-load condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency by using a plurality of drop tests; adding mass onto a vehicle body, performing the drop tests respectively, and identifying intrinsic frequencies of the vehicle under a loading condition and a damping ratio and a vibration mode, which correspond to each intrinsic frequency; calculating the vertical stiffness of the vehicle body, the sprung weight of the vehicle body, pitching stiffness, pitching rotating inertia, side-tipping stiffness and side-tipping rotating inertia; calculating the stiffness Ksf of a front suspension and the stiffness Ksr of a rear suspension; calculating tire stiffness which is consistent with an actual stiffness result; and performing method accuracy verification. In such a way, requirements on test equipment are low, the tests are high in operability, the cost of a single test is lower, the accuracy is high, and a physical parameter calculation method is simpler.

Description

technical field [0001] The invention relates to the field of vehicle parameter identification, in particular to a vehicle parameter identification method based on a drop test single-degree-of-freedom vehicle model. Background technique [0002] Vehicle parameters include modal parameters and physical parameters. Modal parameters mainly refer to: natural frequency, damping ratio, mode shape. The physical parameters have practical physical meanings, among which the more important parameters are the suspension stiffness, damping, sprung mass, unsprung mass, roll moment of inertia, pitch moment of inertia, tire stiffness and related geometric parameters and other parameters. [0003] Why identify modal parameters: [0004] The three modal parameters are very important, because the modal parameters are the basis for identifying the physical parameters. In addition, the modal parameters can also be directly used to evaluate the car’s ride comfort and other performances. If its v...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007G01M17/02G01M17/04G01M7/08
Inventor 张农王立夫郑敏毅
Owner 常州万安汽车部件科技有限公司
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