A test device for joint application of acoustic and vibration loads and its load identification method

Abstract

The invention relates to a test apparatus and method for uncorrelated sound vibration load combination application and uncorrelated multisource frequency domain load identification, and three methods for performing uncorrelated multisource frequency domain load identification in a complicated sound vibration simulation environment by utilizing the apparatus. The three methods are a general-reversion-of-least-square method, an improved regularization method and a multi-input multi-output support vector regression method respectively. The three methods are all capable of identifying the values of a plurality of uncorrelated frequency domain load sources at the same time according to vibration responses of a plurality of test points. The general-reversion-of-least-square method does not need to measure a phase of a transfer function; each frequency corresponding to the improved regularization method has an optimal regularization parameter; and the multi-input multi-output support vector regression method is capable of effectively avoiding the over-learning phenomenon.

Description

technical field [0001] The invention relates to a test device for joint application of acoustic-vibration loads, and three methods for identifying irrelevant multi-source frequency-domain loads using the device in a complex acoustic-vibration simulation environment, which are the least squares generalized inverse method, improved The regularization method and the multi-input multi-output support vector regression machine method, the three methods can simultaneously identify the size of multiple irrelevant frequency domain load sources according to the vibration responses of multiple measurement points on the system. Background technique [0002] In actual engineering, it is difficult to directly measure or calculate the external load acting on the structure when missiles are flying in the air, large buildings such as ocean platforms are stimulated by wind, waves and traffic, and sometimes even the point of action of the load cannot be reached. , making this dynamic load unme...

AI Technical Summary

Problems solved by technology

Among them, the frequency domain method was proposed earlier, and it is mainly realized by inverting the frequency response function between the excitation and the response. However, the matrix inversion method usually needs to solve the generalized inverse when it is applied, and it often encounters ill-conditioned problems and singularity of the coefficient matrix. value decomposition problem

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