Virtual excitation source reconstruction-based noise prediction method

Abstract

The invention provides a virtual excitation source reconstruction-based noise prediction method. The method comprises steps: a statistical energy analysis model is constructed and a subsystem is divided; a to-be-tested structure is subjected to vibration response test; an energy transfer function is constructed; the energy transfer function and cabin vibration test data are used to construct an objective function of the virtual excitation source, virtual excitation source reconstruction is developed, the virtual excitation source energy is used to replace the original input energy, and noiseprediction is completed. Highly dependence on accurate modeling of the structure is reduced, the prediction efficiency is greatly improved, the practical engineering problem that the excitation sourceis difficult to accurately obtain is solved, the engineering applicability of the method is ensured, the prediction precision is improved obviously in comparison with the traditional statistical energy prediction method, the existing statistical energy prediction method is optimized, quick and efficient prediction is realized, and highly operability is achieved.

Description

technical field [0001] The invention relates to the technical field of noise prediction, in particular to a noise prediction method based on virtual excitation source reconstruction. Background technique [0002] Mechanical noise source is one of the main noise sources of underwater equipment systems such as ships and aircrafts, which directly affects the practicability and reliability of underwater equipment systems. For this reason, both at home and abroad attach great importance to the research and development of vibration and noise reduction technology for underwater equipment systems. Noise prediction technology is the theoretical basis and important basis for quantitative acoustic design, vibration and noise reduction design, etc. Accurate noise prediction can provide clear control directions and precise quantitative indicators for the research and development of various vibration and noise reduction technologies. Therefore, it is extremely necessary to carry out rese...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problems that the existing forecasting methods are limited by precise modeling, accurate acquisition of excitation sources, limited number of measuring points, etc., and low forecasting accuracy and efficiency.

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