基于有限单元法的轮胎噪声计算实例分享

weixin

编者按：轮胎噪声属于学术难点之一，本文是一个基于有限单元法的轮胎噪声计算实例，其采用的是sysnoise软件，虽然sysnoise已经改版为Virtual.Lab，但是其内核没有变化，设置上有所调整，功能上有所增强，但是本文的基本分析思路仍然值得借鉴。

Step 1：Create a FEM fluid model

Start LMS Sysnoise

File->New.

• Name: Tire

• File: tire_ifem.sdb

  
  

Model->Option.

• Select ‘FEM Frequency Fluid’

  
  

Step 2：Import the mesh

File->Import.

• Set the Data Type to Mesh, Format to Free, click the FileBoxbutton to browse the CAR3DFEM.fre file.

  
  

Geometry->Check Mesh.

Step 3：Definition of face sets

Change the environment variable FEATRUEANGLE to 30

Geometry →Sets →Faces Selections

• Click the button to select an element of tire profile

  
  

Repeat to create fem-ifeminterface set

Step 4：Definition of the infinite properties

Model →Infinite

Order:3

Envelope Type:Ellipsoidal

Orignin:(-0.318,0,0)

Vector 1(0.4,0,0)

Vector 2(0,0,-0.4)

Vector 3(0,0.1,0)

Model->Fluid Properties.

Accept the default values.

Step 5：Definition of the boundary condition

Model →Vibrating Panels →FEA.

• First select the interface set, second set the frequency range to 20 to 400 linstep20 and the filename with displ.fre,thirdselect Use other file and tire_mesh.frefile

  
  

Step 6：Compute the acoustic field

Inquire → Fmaximum

Analysis → Parameters

Analysis → Solve

• set the frequency range to 20 to 400 linstep20

  
  

Step 7：Import and process the field points

File →Import .

• Set the Data Type to Point and Format to Free, Select the file ‘fp.fre’
  

  
  

Analysis →Process Fields Points

Step 8：Visualization of the results

PostProcess→ColorMap

本文根据LMS公司Li Zenggang的PPT整理而成

lengxuef

谢谢分享，这个是比较老的sysnoise教程了，可以用同样的流程在Virtual.Lab里面计算。