Irrelevant multisource frequency domain load identification method based on COMI-PSO (comprehensive improved particle swarm optimization) algorithm

Abstract

The invention discloses an irrelevant multisource frequency domain load identification method based on a COMI-PSO (comprehensive improved particle swarm optimization) algorithm. The method includes the steps: firstly, decoupling a dynamical equation of load identification according to irrelevance of a plurality of load sources; secondly, identifying loads by the aid of a transfer function based on a unary linear regression model and the least square solution; thirdly, searching a feasible load solution and minimizing the maximum relative error of measured response; finally, performing search by the aid of the COMI-PSO algorithm to solve a simple target optimization problem, and identifying a plurality of irrelevant load sources. According to response signals of a plurality of measuring points, a plurality of irrelevant frequency domain load sources can be simultaneously identified, the problem of difficulty in obtaining the transfer function can be thoroughly solved, occurring ill-posed problems are solved by matrix inversion at resonant frequency, precision of multi-element load excitation identified by the method and sensitivity to measuring noise are superior to those of a traditional method, and 3db engineering precision requirements can be basically met.

Description

technical field [0001] The invention relates to an uncorrelated multi-source frequency domain load identification method based on COMI-PSO algorithm. Background technique [0002] Load identification is a method to obtain the excitation of the structure by measuring the dynamic response of the structure and the characteristics of the system, which belongs to the second type of inverse problem in the vibration problem. The excitation source is the main cause of the vibration of the system structure, but in actual engineering, such as missiles flying in the air, trains running on tracks, and large buildings such as ocean platforms and bridges are subject to random excitations such as wind and waves, it is difficult to Direct measurement or calculation of the external load acting on the structure, even sometimes because the load application point is not accessible, making this dynamic load unmeasurable. Load identification technology provides an effective method to identify dy...

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Problems solved by technology

[0005] The purpose of the present invention is to propose an uncorrelated multi-source frequency-domain load identification method based on the COMI-PSO algorithm, which overcomes the difficulty in obtaining the matrix inversion load transfer function in the traditional load identification method, and the matrix singularity will appear in direct inversion and pathological conditions, complex optimization process, low time efficiency, and identification accuracy cannot be guaranteed, effectively improving the load identification accuracy

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