A Reliability Optimization Method for Structure-borne Noise Based on Dimensional Analysis Strategy

Abstract

The invention discloses a method for optimizing reliability of structural noise based on a dimension-by-dimension analysis strategy. The method comprises following steps: firstly, establishing a structural noise optimizing model based on an interval reliability analysis model by using a quantitative structure for a model of interval value and environment and other uncertainties, determining orders and gauss integral points based on least-squares approximation responding to interval parameters by utilizing structural acoustics to response to nonlinearity degree related to interval parameters; secondly, utilizing gauss integral points and a quantitative model for interval numbers to sample parameter vectors of intervals, calculating response vector value at interval parameter sample points, establishing the best square approximation in order to determine the max-minimum point matrix such that response interval vectors can be calculated; and finally, utilizing response interval vectors and safety requirement to calculate reliability in intervals and finishing structural optimization under drive of the optimizing algorithm. The method for optimizing reliability of structural noise based on the dimension-by-dimension analysis strategy has following beneficial effects: by replacing classic safety factor with interval reliability, the method echoes the fine development trend of optimizing structural noise; conservativeness of a conventional optimizing method is effectively avoided; and the method has a broad application prospect.

Description

technical field [0001] The invention relates to the technical field of equipment noise measurement, in particular to a noise optimization method in a closed structure space, which is suitable for noise optimization in the interior space of equipment with closed cabin structures such as passenger planes, automobiles and submarines. Background technique [0002] Closed structural forms (such as the passenger plane fuselage or submarine cabin enclosed by a cylindrical thin-walled structure, and the interior space of a car enclosed by a rectangular parallelepiped thin-walled structure) are very common in the engineering field. Under the action of excitation, the vibration radiates noise to the inner space of the closed structure. High-level noise not only seriously affects the physical and mental health and comfort experience of the occupants in the cabin, but also has great harm to the comprehensive performance of the equipment or the functions of key equipment components. Acou...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to overcome the limitation of large sample capacity requirements for design parameter test data in random optimization of structural noise, and to overcome the limitation of interval perturbation analysis method in structural noise analysis to the fluctuation of design parameters between small areas, and to provide a Method of structural noise analysis and reliability optimization with interval parameters

Images