Method for recognizing torsion mode and bending mode in mode test

A technology of torsional mode and bending mode, which is applied in the identification of modal parameters of body-in-white, the identification of torsional mode and bending mode in modal tests, and can solve the problem that the first-order torsional and bending modes are difficult to accurately identify, etc. problem, to achieve the effect of improving the accuracy of judgment and the efficiency of detection

Inactive Publication Date: 2015-01-07
BRILLIANCE AUTO
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for identifying the torsional mode and the bending mode in the modal test, which fundamentally solves the problem that the first-order torsional and bending modes in the existing TB modal test are difficult to solve in many mode shapes. Accurately identified issues

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  • Method for recognizing torsion mode and bending mode in mode test
  • Method for recognizing torsion mode and bending mode in mode test
  • Method for recognizing torsion mode and bending mode in mode test

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Embodiment Construction

[0018] The following combination Figure 1~3 , the content of the present invention will be described in detail through specific embodiments.

[0019] 1) Point selection position:

[0020] like figure 1 As shown, 12 contour points representing the body structure are symmetrically selected on the left and right sides of the car TB. These points should be at the positions where the frame structure of the body is more rigid. The corresponding body structure is as follows figure 2 shown. For ease of viewing, only the schematic diagram of points taken under the state of body-in-white and door cover system is shown. Take points 1 and 2 at the front end of the vehicle body, point 1 is the junction of the front longitudinal beam 21 of the vehicle body and the right column 22 of the water tank, and point 2 is the upper end of the right column 22 of the water tank; Point 5 and point 3 are the joints of the front end of the roof 24, the upper end of the front windshield 25 and the o...

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Abstract

The invention relates to a method for recognizing a torsion mode and a bending mode in a mode test. The method is characterized by comprising the following steps that (1) a plurality of contour points are symmetrically arranged at the positions, with relatively high vehicle body frame structure rigidity, on the left side and the right side of a vehicle TB needing to be tested; (2) excitation is applied to the position, with large rigidity, of the lower end, at the combined part of the right side of the vehicle body and a firewall, of a front longitudinal beam through a multi-point excitation and multi-point response method, a frequency and acceleration Z-direction amplitude curve is obtained, and a mode shape result is obtained; (3) the curve is processed, the acceleration amplitude mean curves on the left side and the right side are added or subtracted, averaging is conducted, and thus a resultant acceleration mean value curve and a difference value acceleration mean value curve are obtained; (4) the mode shape result is combined, and corresponding modes are recognized when peak values simultaneously appear in the resultant acceleration mean value curve and the difference value acceleration mean value curve. The problem that the torsion mode and the bending mode in numerous mode shapes are difficult to recognize in existing TB mode tests is solved. The efficiency and the accuracy of mode judgment are improved.

Description

technical field [0001] The invention relates to the field of Trimmed Body parameter detection, in particular to a method for identifying modal parameters of a body in white, in particular to a method for identifying torsional modalities and bending modalities in modal tests. Background technique [0002] NVH is the English abbreviation for Noise, Vibration, Harshness. It is a comprehensive question to measure the quality of car manufacturing, and it gives car users the most direct and superficial feeling. At present, people pay more and more attention to the comfort and safety of automobiles, and the control of automobile NVH performance is becoming more and more important in the process of vehicle development. Improving the NVH performance of automobiles can improve the market competitiveness of products. Modal analysis is the basis of NVH performance. Body modal analysis is currently divided into several levels: component modal, body-in-white modal, Trimmed Body (h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M17/007
Inventor 蓝浩伦李飞乔鑫孔繁华邓坤张晓维
Owner BRILLIANCE AUTO
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