ABAQUS声学问题-利用ABAQUS声学建模问题
91页1、Copyright 2005 ABAQUS,Inc.Modeling Acoustic Problems Using ABAQUSLecture 3Structural-Acoustic Analysis with ABAQUSCopyright 2005 ABAQUS,Inc.L3.2OverviewAcoustic Element TypesMaximum Element SizeExternal Meshed DomainBoundary ConditionsLoadsExterior Problems using Infinite ElementsAnalysis ProceduresOutputStructural-Acoustic Analysis with ABAQUSCopyright 2005 ABAQUS,Inc.Acoustic Element TypesStructural-Acoustic Analysis with ABAQUSCopyright 2005 ABAQUS,Inc.L3.4Acoustic Element TypesAcoustic eleme
2、nts are available in linear and quadratic interpolation.ABAQUS/Standard has first-and second-order full integration elements:Quadrilateral and triangular for planar and axisymmetric domains(AC2D3,AC2D4,AC2D6,AC2D8,ACAX3,ACAX4,ACAX6,ACAX8)Hexahedral,tetrahedral,and wedge for three-dimensional domains(AC3D4,AC3D6,AC3D8,AC3D10,AC3D15,AC3D20)One-dimensional acoustic links to model acoustic channels(AC1D2,AC1D3)Examples:Piping,ducts,small openings between large regionsStructural-Acoustic Analysis wit
3、h ABAQUSCopyright 2005 ABAQUS,Inc.L3.5Acoustic Element TypesABAQUS/Explicit has first-order reduced integration elements:Quadrilateral and triangular for planar and axisymmetric domains(AC2D3,AC2D4R,ACAX3,ACAX4R)Hexahedral and tetrahedral for three-dimensional domains(AC3D4,AC3D8R)Structural-Acoustic Analysis with ABAQUSCopyright 2005 ABAQUS,Inc.L3.6Acoustic Element TypesAcoustic-structural interface(ASI)coupling elements(ABAQUS/Standard only):Provide the coupling effects between an acoustic mes
4、h and a structural mesh.Can be defined two different ways:User can explicitly create ASI elements.User can allow ASI elements to be generated internally and automatically,using TIE constraints between the fluid and solid surfaces.TIE constraints are available for both ABAQUS/Standard and ABAQUS/Explicit and will be discussed further in the next lecture.Structural-Acoustic Analysis with ABAQUSCopyright 2005 ABAQUS,Inc.L3.7Acoustic Element TypesAcoustic infinite elements:Available in both ABAQUS/S
5、tandard and ABAQUS/Explicit*.Provided for exterior problems.Have surface topology and are similar to structural infinite elements.Generally defined on a terminating surface of a region of acoustic finite elements.Formulation is considerably more accurate than impedance-type boundary conditions for complex wave fieldsninth order implementation.Can be coupled directly to a structural surface using TIE constraints.In general,acoustic infinite elements will provide higher accuracy when used instead
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