Multi-scale noise simulation analysis method

Abstract

The invention discloses a multi-scale noise simulation analysis method, which comprises the following steps of: respectively carrying out dimension analysis, progressive analysis, statistical analysisand correlation analysis on noise under a specific coordinate system through a Ffowcs Williams / Hawking equation to obtain a noise expression; performing Fourier transform on the noise expression, andrewriting the noise expression in combination with a Green function to obtain a rewritten noise expression; based on the rewritten noise expression and the physical process of the noise, performing physical modeling of the noise to obtain a modeling model; and analyzing each parameter in the modeling model, and calculating a spectrum function of the far-field noise based on the modeling model.

Description

Technical field [0001] The invention relates to the technical field of noise simulation analysis, in particular to a multi-scale noise simulation analysis method. Background technique [0002] At present, noise simulation analysis technology mainly adopts two methods: empirical formula and numerical simulation. Especially in the last ten years, the popular domestic commercial acoustics software is used to perform numerical simulations at a macro scale. Numerical simulation algorithms such as finite element and boundary element methods are used for mid- and low-frequency bands, and statistical energy methods are used for mid- and high-frequency simulations. The numerical calculation methods used by the existing general-purpose commercial software have been able to solve part of the component-level noise simulation problems, but the noise problem at the micro-scale is not considered, and it is difficult to perform system-level noise simulation analysis for large and complex equipme...

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Problems solved by technology

[0003] 1) Frequency range limitation

The numerical methods adopted by traditional commercial software can only perform simulation analysis on acoustic problems within a specific frequency range, and the frequency range is limited; however, for system-level acoustic simulation problems, due to the different structures, materials, and scales of each component, the noise frequency range is often limited. The span is very large, and it is difficult to perform simulation analysis through traditional noise software

[0004] 2) Changes in physical quantities such as medium stratification and temperature and density cannot be considered

Traditional noise commercial software often only simulates specific physical phenomena, and the physical model used is relatively simple, which cannot fully consider the influence of medium layering and changes in physical quantities such as temperature and density on noise analysis.

[0005] 3) The correlation between sound source and sound propagation cannot be considered

Traditional noise commercial software often processes and analyzes sound source and sound propagation as two independent processes, which cannot fully consider the correlation between sound source and sound propagation, further weakening the reliability of simulation results

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