Simcenter 3D acoustics tutorial: motion and ATV encapsulation

This 45-page step-by-step tutorial, written for Simcenter 3D 2506 and estimated at about 2.5 hours, shows how to compute the noise radiated by a gearbox using loads from a multibody dynamics (motion) simulation. It then repeats the analysis with a poro-elastic encapsulation and hard cover, so the free-field and encapsulated results can be compared.

What the document covers

• Importing structural modes from a Simcenter Nastran .op2 file and switching the FEM to a vibro-acoustic analysis type
• Building the acoustic mesh: a surface wrap, a convex outer mesh, solid-from-shell fill with acoustic fluid elements, and a microphone sphere
• Setting up an Acoustic Transfer Vector (ATV) solution in SOL 108, including the AML region, forcing frequencies and solver options
• Creating an assembly FEM, preprocessing modal participation factor loads from the motion results and solving the MATV response
• Postprocessing with Campbell plots of acoustic pressure and power and order tracking, comparing baseline and optimised gear loads
• Modelling the poro-elastic layer and cover interfaces, and comparing acoustic power with and without the encapsulation

Who it is for

NVH and acoustic simulation engineers working on gearboxes, drivetrains and other rotating machinery who already know the basics of Simcenter 3D and want a worked motion-to-acoustics example.