Nonlinear multi-target range robust optimization based automobile noise reduction method

Abstract

A nonlinear multi-target range robust optimization based automobile noise reduction method comprises the steps of 1, conducting mathematical modeling for performance indexes, determining design variables of an automobile structure, determining a noise index at an observation point according to finite element calculation results, and establishing a multi-target optimization model; 2, describing all uncertain parameters of a system with ranges; 3, on the basis of range order relations and sensitivity analyses, conducting robustness processing of objective functions on the noise index; 4, on the basis of range possibility degrees, conducting feasible robustness conversion on constraint conditions; 5, converting a two-layer nesting optimization problem into a conventional single-layer optimization problem with an improved Taylor expansion method; and 6, solving the converted certainty multi-target optimization problem, and determining design values of all components of an automobile to achieve the optimal noise reduction effect. By the aid of the method, the automobile noise reduction problem containing range parameters can be solved systematically, the insensitivity to parameter fluctuations is improved, and the usage safety of the automobile structure and the stability of the noise reduction performance are improved.

Description

technical field [0001] The invention relates to the field of vehicle structure optimization design methods for the purpose of noise reduction, in particular to a vehicle noise reduction method based on nonlinear multi-objective interval robust optimization. Background technique [0002] With the rapid development of my country's aerospace, automobile, ship and other technology-intensive industries, as well as the improvement of people's requirements for comfort and safety, the problems of vibration and noise have become more prominent. Among them, the noise in the cabin of the car will not only damage the health of the passengers, but also cause the fatigue of the driver, which will indirectly affect the driving safety; the structural vibration caused by excessive noise will accelerate the aging of auto parts and shorten the service life of the car. . How to accurately analyze the noise characteristics of large and complex structures such as automobiles, optimize the design...

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Problems solved by technology

[0005] The technology of the present invention solves the problem: overcomes the deficiencies in the structure optimization related to the noise reduction of automobiles in the prior art, provides a method for noise reduction of automobiles based on nonlinear multi-objective interval robust optimization, and introduces the concept of robust optimization into In the actual problem of vehicle structure optimization with interval uncertain parameters, a robust design scheme of vehicle structure is obtained to reduce cabin noise level

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