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Dynamic quality detection method for whole assembly of automobile products

A quality inspection method and vehicle assembly technology, applied in vehicle testing, machine/structural component testing, measuring devices, etc., can solve problems such as inability to dynamically control and guarantee quality

Inactive Publication Date: 2013-08-14
JINAN UNIVERSITY
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Problems solved by technology

[0005] In order to overcome the lack of complete and applicable detection technology and standard methods for direct detection and evaluation of the mechanical assembly of automobile products when a series of "static" and limited "dynamic" quality inspections are carried out on the mechanical assembly of automobiles according to the relevant standards of the automobile industry in the existing technology The dynamic quality of itself, thus can not carry out this defect of dynamic quality control and assurance (QC / QA) in the vehicle assembly stage, the object of the present invention is to provide a kind of dynamic quality inspection method of vehicle product assembly

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[0029] The present invention is as a kind of dynamic quality detection method of automobile product vehicle assembly, and its evaluation index, standard detection point, evaluation index calculation formula and evaluation index benchmark are respectively specifically as follows:

[0030] (1) Evaluation index: The "dynamic stiffness (Kd)" of the assembly coupling interface between the chassis part and the body part of the automobile is used as the evaluation index of the dynamic quality of the assembly.

[0031] Dynamic stiffness Kd=K+j(2πfC), where K is the static stiffness of the coupling interface (Newton / meter, N / m), C is the damping coefficient of the coupling interface (Newton s / meter, Ns / m), f is the dynamic force excitation frequency (Hz), is an imaginary unit. Dynamic stiffness has been proved by the theory of mechanical structure dynamics that it can be used to accurately and comprehensively describe the dynamic characteristic index of coupling stiffness (resistance...

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Abstract

The invention relates to a dynamic quality detection method for whole assembly of automobile products. The method comprises the following steps: N assembly welding or bolt junction points between the chassis component and the automobile body component of the automobile product are selected as standard detection points, and the dynamic rigidity of the assembly coupling junction interface where the N detection points are located form a complex matrix (Kd); excitation test is performed on the positions of the standard detection points, the matrix element of a frequency response function of test signals is recorded, and a standard value (Kd)0 is calculated; excitation test is performed on the automobile products of the same model number, the evaluation index value (Kd)n of the nth detected automobile product is calculated, the absolute value of difference value between the evaluation index value (Kd)n and the standard value (Kd)0 is calculated according to the formula that delta = |(Kd)n - (Kd)0 |; and if the ith diagonal entry magnitude of the absolute value is smaller than a reference value, the dynamic quality of the ith welding of the automobile product is regarded as excellent, otherwise, the dynamic quality of the ith welding of the automobile product is regarded as poor or moderate-level. Through the dynamic quality detection method, the dynamic quality of the machine assembly of the automobile products can be directly detected and evaluated.

Description

technical field [0001] The invention relates to the technical field of quality control and quality assurance (QC / QA) of automobile products, in particular to a dynamic quality detection method for vehicle assembly of automobile products. Background technique [0002] Automobile products are assembled from a series of components. The assembly quality of these components affects the overall mechanical properties of the product (including static quality and dynamic quality). The quality of the final mechanical assembly is particularly critical, which directly affects the dynamic quality of the product. (Interior Vibration, Noise and Driving Stability—NVH) level. [0003] At present, the existing quality control and assurance (QC / QA) work related to automobile 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 automobile industry standards of the People's Republic ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01M7/00G01M17/007
Inventor 吕广庆蒋俊钢王雷周斌庞冬梅吕新广
Owner JINAN UNIVERSITY
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