基于模态叠加法的声固耦合噪声仿真与实验  

Simulation and Experiment on Coupled Vibro-acoustic Noise Using Modal Superposition Method

作　　者：赵冠军[1] 刘更[1] 吴立言[1] 

机构地区：[1]西北工业大学机电学院,西安710072

出　　处：《机械科学与技术》2007年第12期1633-1636,共4页Mechanical Science and Technology for Aerospace Engineering

摘　　要：在ANSYS中建立了长方体箱体的有限元模型,并计算结构模态。将有限元模型和结构模态导入Virtual Lab,计算空腔声模态,用模态叠加法计算耦合声场对激励的响应,得到了声压级分布云图和场点频率响应曲线。设计了长方体箱体的振动噪声实验,将声卡采集得到的噪声信号在Matlab中进行傅立叶分解,得到声场内一点对激振频率的响应曲线。仿真数据与实验数据有较好的一致性。The FEM model of a cuboid box is established and its structural modal is calculated with ANSYS. With the introduction of the FEM model and the structural mode into Virtual Lab, the acoustic modal in the empty chamber of the cuboid box is computed. The modal superpostion method is used to calculate the response of the coupled acoustic field to excitation, and the acoustic pressure distribution cloud chart and the field point frequency response curve are obtained. The experiments on vibration and noise are designed. The noise signals collected by a sound card are analyzed with the Fourier decomposition in Matlab, and the excitation frequeney response curve of a point in the acoustic field is acquired. The experimental data is consistent with simulation results.

关 键 词：声固耦合噪声 模态叠加法 振动噪声实验 

分 类 号：TH113[机械工程—机械设计及理论]