Equivalent statistical energy analysis modeling method for multi-subsystem variable-thickness flat plate

Abstract

The invention provides an equivalent statistical energy analysis modeling method for a multi-subsystem variable-thickness flat plate, which belongs to the technical field of radiation noise and comprises the following steps of: establishing subsystem models with different thicknesses; calculating a lower limit frequency required by each subsystem with different thicknesses to meet statistical energy analysis; extracting modal densities of subsystems with different thicknesses; performing numerical addition on the modal densities of all the subsystems to obtain the modal density of the equivalent model; obtaining the lower limit frequency of the equivalent model through the modal density of the equivalent model; obtaining an equivalent model thickness through an equivalent model thickness determination formula and the equivalent model lower limit frequency; calculating dynamic characteristics of the two models before and after equivalence under the same excitation, and comparing simulation results; obtaining quivalent model volume attributes and material attributes, and establishing an equivalent model. According to the method, a multi-subsystem variable-thickness flat plate structure is equivalent to a single subsystem, and the lower limit frequency of statistical energy analysis is greatly reduced by utilizing a method of carrying out numerical superposition on modal density.

Description

technical field [0001] The invention belongs to the technical field of radiation noise, and in particular relates to an equivalent statistical energy analysis and modeling method for multi-subsystem variable-thickness plates. Background technique [0002] With the development of the machinery industry, mechanical parts will produce a certain impact during the working stage, resulting in the generation of radiation noise, which not only greatly reduces the service life of mechanical parts, but also makes the noise problem more and more serious. The problem of vibration and noise reduction of mechanical parts It has become a very important research topic at present, so the ability to accurately predict noise becomes the key to vibration and noise reduction. [0003] In recent years, many scholars have done a lot of research on predicting noise. Most of them use finite element combined with boundary element method to predict the radiation noise of mechanical parts. However, thi...

AI Technical Summary

Problems solved by technology

However, the statistical energy method is suitable for the calculation of radiation noise of thin-walled structures. For some complex multi-subsystem variable-thickness plate structures, modeling is difficult and complex. At the same time, when there are many subsystems, the modeling time will be slower. It becomes more cumbersome and complicated, which greatly reduces the characteristics of the statistical energy method in measuring acoustic radiation noise, thereby reducing the practical application value of the method

Images