Method for determining bonding position of a loss factor frequency-dependent unconstrained damping layer on white car body

Abstract

The invention relates to a method for determining the bonding position of a loss factor frequency-dependent unconstrained damping layer on a white car body and belongs to the vehicle engineering technical field. According to an existing method, the frequency dependence of a damping material when the bonding position of an unconstrained damping layer on a white car body structure is not considered, and a proper unconstrained damping layer material cannot be selected out in the characteristic frequency range of the vibration of a car body plate, and the damping vibration reduction efficiency of the unconstrained damping layer material cannot be utilized maximally, while, with the method of the invention adopted, the above problems can be solved. According to the method, finite element modeling and modal analysis are performed on a car body structure, so that the magnitude and distribution of modal strain energy at each order of the car body structure are obtained, and the strain energy is superposed, so that the comprehensive modal strain energy of the car body structure can be obtained, and positions where the comprehensive modal strain energy is higher than a threshold value are extracted and are subjected to damping treatment, and the sum of modal strain energy of various units of various plates of the car body is calculated, wherein the various units of the various plates of the car body are subjected to unconstrained damping layer treatment under modal frequency at each order in the frequency range of damping vibration reduction, and a loss factor frequency-dependent unconstrained damping layer material can be selected, so that an optimal vibration reduction effect can be realized.

Description

technical field [0001] The invention relates to the technical field of vehicle engineering, in particular to a method for determining the sticking position of a loss factor frequency-varying free damping layer on a body in white. Background technique [0002] Pasting damping materials on thin-walled automotive body-in-white is a widely used method for controlling the vibration of body structures. According to the structure of the damping material, it can be divided into two types: free damping layer treatment and constrained damping layer treatment. Free damping treatment is to paste the sheet damping layer material directly on the surface of the metal structure, and consume the vibration energy through the friction between the molecular chains of the damping layer material when the structure bends and vibrates. The free damping layer processing method is widely used in the field of vehicle engineering because of its simple structure and easy implementation on the body stru...

AI Technical Summary

Problems solved by technology

[0007] The present invention solves the problem that the frequency variation of the damping material is not considered when determining the position of the free damping layer pasted on the body-in-white structure in the existing method, and thus cannot select a suitable free damping layer material within the characteristic frequency range of vibration of the body panel, and cannot maximize the To maximize the use of the damping and vibration reduction efficiency of the free damping layer material, a method for determining the position of the loss factor frequency-dependent free damping layer on the body-in-white is provided.

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