Method and system for optimizing automobile body damping distribution

Abstract

The invention provides a method for optimizing automobile body damping distribution. The method comprises the following steps: a finite element model of a composite damping plate is constructed, an automobile body is taken as a flexible panel of the composite damping plate, and a layer of conode bias shell elements for simulating a damping material is arranged on the flexible panel; values of assigned frequencies in a noise transfer function are solved in a preset frequency range, sound pressure amplitudes of the assigned frequencies are obtained, and corresponding target sound pressure values are set for the assigned frequencies; a target function is determined, and a topological optimization model is established with the relative thickness of a damping unit as a design variable and the mass of the damping unit as a constraint condition; modal analysis is performed on all the shell elements on the composite damping plate according to the finite element model, the topological optimization model of each shell element is solved, and an automobile body damping distribution nephogram and a noise transfer function curve are obtained. With implementation of the method, damping distribution is designed, global optimization processing of all modals in a certain frequency range is realized, and the inhibition action of damping distribution on noise radiation can be improved obviously.

Description

technical field [0001] The invention relates to the technical field of automobile detection, in particular to a method and system for optimizing damping distribution of a vehicle body. Background technique [0002] Since the damping material can be pasted on the surface of the metal structure to increase the damping characteristics of the overall metal structure, it can achieve better characteristics of vibration and noise reduction performance, so that the damping material is more and more widely used in the field of automobile industry, but the body The problem of damping distribution optimization has been plagued by major OEMs and damping suppliers. The main reason for this problem lies in the rationality of the damping distribution position and area, which will directly affect the performance of damping vibration and noise reduction. Usually, unreasonable body damping distribution not only fails to achieve the purpose of vibration reduction and noise reduction, but also ...

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Problems solved by technology

[0002] Since the damping material can be pasted on the surface of the metal structure to increase the damping characteristics of the overall metal structure, it can achieve better characteristics of vibration and noise reduction performance, so that the damping material is more and more widely used in the field of automobile industry, but the body The problem of damping distribution optimization has been plagued by major OEMs and damping suppliers. The main reason for this problem lies in the rationality of the damping distribution position and area, which will directly affect the performance of damping vibration and noise reduction.

[0004] However, the inventors have found that both of the above two types of optimization methods have deficiencies. The disadvantages are: in the first method, it is time-consuming and labor-intensive, and the quality of the optimization results is related to the experience of engineers. Although it can improve certain The damping characteristics at one mode, but there is no global optimization for all modes in a certain frequency range; in the second method, no optimization is done for other modes of the structure, let alone for a certain mode All modes in a frequency range give a global optimization process

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