基于有限单元法的轮胎噪声计算实例分享
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 modelStart LMS SysnoiseFile->New.[*]Name: Tire
[*]File: tire_ifem.sdb
Model->Option.
[*]Select ‘FEM Frequency Fluid’
Step 2：Import the meshFile->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 setsChange the environment variable FEATRUEANGLE to 30Geometry →Sets →Faces Selections
[*]Click the button to select an element of tire profile
Repeat to create fem-ifeminterface setStep 4：Definition of the infinite propertiesModel →InfiniteOrder:3Envelope Type:EllipsoidalOrignin:(-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 conditionModel →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 fieldInquire → Fmaximum
Analysis → ParametersAnalysis → Solve
[*]set the frequency range to 20 to 400 linstep20
Step 7：Import and process the field pointsFile →Import .
[*]Set the Data Type to Point and Format to Free, Select the file ‘fp.fre’
Analysis →Process Fields PointsStep 8：Visualization of the resultsPostProcess→ColorMap
本文根据LMS公司Li Zenggang的PPT整理而成
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。
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