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Tips & Tricks
How do I create an SEA cavity using shrinkwrap?
How to create FE acoustic cavities with complex shapes
Ricardo
Alvarez
CFD, Vibro-Acoustics
How can apply anechoic termination to a muffler tailpipe modeled with FE acoustics?
I have an acoustic FE model of a muffler/silencer. I would like to apply an anechoic termination to the tailpipe faces. How can this be applied?
Ricardo
Alvarez
Vibro-Acoustics
Visualize acoustic/solid mesh in VA One
VA One will typically display the skin of a 3D mesh of acoustic element. It is possible to display the full mesh and also animate the results while visualizing the 3D mesh.
Ricardo
Alvarez
Vibro-Acoustics
How to manually set the megawords variable in Rayon?
The Rayon solver occasionally will restart the analysis if the megawords variable is too small. Use these simple instructions to increase/adjust Megawords value.
Ricardo
Alvarez
Vibro-Acoustics
How to call a script within a script
When using VA One developer's kit and new scripts are being created it is useful to call a script within a script. Here we show you how to achieve this.
Ricardo
Alvarez
Vibro-Acoustics
How to clean registry to restore files association
Clean the registries manually to fully use the files associativity from PAM-STAMP in the last installed version.
Benoît
Muller
Sheet Metal Forming
SEA - Display energy flow for a subsystem in complex models
In a complex SEA model made out of several subsystems, VA One can be used to display the energy flow to a particular subsystem in a couple of steps, this helps to understand how the energy flows to a receiving subsystem in order to define noise control strategies. One of the steps is to isolate the junctions associated to this subsystem, this will also help to understand / verify the connectivity of the model.
Ricardo
Alvarez
Vibro-Acoustics
SEA - Virtual Transmission Loss
In a complex SEA model made out of several subsystems, using VA One is possible to extract the transmission loss (TL) of one or various subsystems in a single step. Transmission loss of partitions e.g. walls, floor, windows, enclosures have been studied theoretically and experimentally over many years. Partitions are often inhomogeneous, non-uniform, comprise combinations of different materials, have indeterminate boundary conditions and are subject to sound complex fields. Surprisingly the sound transmission behavior of many plane partitions is quite well represented by a simple model which ignores the boundaries. Sound transmission loss can be used to correlate the vibro-acoustic behavior of simple and/or complex systems.
Ricardo
Alvarez
Vibro-Acoustics
VA One - FE or SEA- How to map trim thickness for sound package representation
Sound control treatments / Trim ,(e.g. headliners,hood liners, dash panel and floor isolators, etc) have complex shapes with variable thickness, sometimes only CAD parts are available. How can I use this data to create noise control treatments (NCT) in FE and/or SEA models with variable thickness?. In this article it is shown how to create a variable thickness noise control treatment with VA One for SEA and/or FE purposes at the same time. A multiple noise control treatment (MNCT) is created for SEA purposes and multiple FE Faces with the mapped/discrete thicknesses are created for FE purposes,
Ricardo
Alvarez
Vibro-Acoustics
Find dominant path in SEA models
Statistical energy analysis (SEA) computes the flow of vibrational energy between coupled subsystems by applying principle of conservation of energy. Using conservation of energy power balance equations which govern response of a system. Since it is based on energy flow, path analysis is straight forward. In this article it is described how to extract the dominant path in a complex model using SEA and VA One . As a result the subsystems in the dominant path are displayed in the 3d window (All other subsystems are hidden).
Ricardo
Alvarez
Vibro-Acoustics