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A dynamic fault diagnosis method for mechanical assembly of vehicle products

A fault diagnosis and dynamic technology, which is applied in the direction of vehicle testing, machine/structural component testing, measuring devices, etc., can solve the problems that there is no complete set of dynamic detection and diagnosis technical specifications and standard requirements, and achieve the level of mechanical assembly quality assurance , Intuitive assembly cause and position discrimination, quantification of the effect of dynamic characteristic indicators

Inactive Publication Date: 2015-12-09
JINAN UNIVERSITY +1
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

For the dynamic quality of each assembly link of the finished vehicle and its dynamic "force excitation-vibration and acoustic response" transmission path-dynamic faults, there is currently no suitable set of technical specifications and standard requirements for dynamic detection and diagnosis

Method used

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  • A dynamic fault diagnosis method for mechanical assembly of vehicle products
  • A dynamic fault diagnosis method for mechanical assembly of vehicle products
  • A dynamic fault diagnosis method for mechanical assembly of vehicle products

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Embodiment Construction

[0035] Such as figure 1 , 2 , 3, a dynamic fault diagnosis method for mechanical assembly of vehicle products, comprising steps in the following order:

[0036] (1) Define M dynamic response points oa on the component A to be assembled of the vehicle product m (m=1,2,3,...,M), N external dynamic force excitation points ib on component B to be assembled n (n=1, 2, 3,..., N) and J mechanical assembly coupling points ca between parts A and B j 、cb j (j=1,2,3,...,J);

[0037] According to the structural design of this type of vehicle product, it is assumed that the "secondary assembly parts" concerned are the body (A part) and the chassis (B part), and a series of mechanical assembly (welding, bolting, riveting or bonding ), where the number of key assembly coupling points is J=8 (4 on the left and right sides); select and mark the test locations of “dynamic force excitation” and “vibration response” and their number (j=1,2,...,8), they should be as close as possible to the ...

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Abstract

The invention discloses a dynamic fault-diagnosis method for mechanical assembling of a vehicle product. The method includes: defining vehicle assembling parts and J assembling coupling junction points among the vehicle assembling parts; before and after the assembling parts are assembled, carrying out vibration tests respectively on a series of dynamic motivation-response FRF (frequency response function) spectrums and calculating path contributions of assembling transmission steps and SRSS values of paths; and through comparing a difference value between an SRSS0 of an excellent dynamic quality sample vehicle and an SRSS of secondary assembling parts which are focus points of a vehicle product to be diagnosed and judging a dynamic quality of assembling coupling junction positions of the secondary assembling parts of the vehicle according to an absolute value Delta of the difference value and the vehicle with a small overall Delta value is judged to be excellent and inferior otherwise. After the dynamic quality of all the assembling coupling junction positions are judged, the assembling dynamic faults of the secondary parts designated for the vehicle product can be diagnosed effectively. The dynamic fault-diagnosis method for the mechanical assembling of the vehicle product is capable of detecting directly and diagnosing the dynamic faults of the mechanical assembling itself of the vehicle product so that a novel effective technical approach for dynamic QA (quality assurance) of the whole vehicle is developed.

Description

technical field [0001] The invention relates to the field of quality control and assurance (QC / QA) of vehicle product assembly, in particular to a dynamic fault diagnosis method for vehicle product mechanical assembly. Background technique [0002] Vehicle products are assembled by a series of electromechanical components. The assembly quality of these components affects the overall static quality and dynamic quality of the product. The dynamic quality of each mechanical assembly link is particularly critical, directly affecting the dynamic quality of the product ( Vehicle Vibration, Noise and Handling Stability - NVH) level. [0003] At present, the existing quality control and assurance (QC / QA) work related to vehicle mechanical assembly is mainly to conduct a series of static tests and relatively simple vibration, noise and handling stability tests and inspections according to the automotive industry standards of the People's Republic of China, such as "Automobile produc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01M17/007G01M7/02
Inventor 吕广庆罗治辉蒋俊钢周斌庞冬梅
Owner JINAN UNIVERSITY
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