Tips & Tricks

Here you will find articles on how to solve specific issues related to ESI's software solutions. Missing ESI products will be added progressively. Each article has a short abstract which is accessible to everyone. As logged users you can see the full article with all attached screenshots, and you can post comments related to each article

FE area junctions : Why is my FE area junctions discontinuous?

FE area junctions : Why is my FE area junctions discontinuous?
Its most likely due to the nature of the meshes. A fundamental assumption for FE->FE Acoustic junctions is that the FE mesh must be finer than the acoustic mesh read more
Vibro-Acoustics
25
0

What is the difference in TL from the VTL and Effective TL?

What is the difference in TL from the VTL and Effective TL?
The difference is that with Effective TL you select a single area junction and with VTL you select a set of panels. The only practical difference is in the area of the connection between the cavities read more
Vibro-Acoustics
89
0

Why is TL dependent on the size of the panel? Shouldn't TL be independent of the shape and size of the panel?

Why is TL dependent on the size of the panel? Shouldn't TL be independent of the shape and size of the panel?
There are some small area/perimeter dependencies in CLFs through a panel but these should usually only cause small differences. Basically, when calculating non-resonant TL AutoSEA2 needs an expression for the impedance of the fluid on either side of the panel read more
Vibro-Acoustics
43
0

Can I extract results when running VA One on Linux?

Can I extract results when running VA One on Linux?
Can I extract results when running VA One on Linux?, Yes, here is few options: 1. One way to do this is to execute a QuickScript on Windows, while leaving the va1 file on Linux. Eg. solve on the Linux box, and run a QS script on Windows to extract the results,... read more
Vibro-Acoustics
32
0

How does VA One calculate damping from NCT?

How does VA One calculate damping from NCT?
The equation can be found in reference [1] as Eq. (21), in which • T+U ~ 2T = 0.5*m*|v|^2, where m is the mass per unit area of the SEA panel. • Pdiss = 0.5*Re{z}*|v|^2, where z is the impedance of the base of the trim. In the ratio, the wave magnitude |v|... read more
Vibro-Acoustics
34
0

Defined absorption in VA One FEM/BEM

Defined absorption in VA One FEM/BEM
Can I add user defined absorption in VA One FEM/BEM?, Yes, this application of User Defined Impedances to Surfaces of BEM Fluids and FE Acoustic Cavities is implemented in VA One 2007.5 read more
Vibro-Acoustics
20
0

What is the size of stack space available for a compiled and uncompiled Quick Script?

What is the size of stack space available for a compiled and uncompiled Quick Script?
In VA One 2010 the stack size for uncompiled is 8192 bytes, for compiled is 2048 bytes. In VA One 2010.5 the stack size will be 8192 bytes for both compiled and uncompiled scripts. read more
Vibro-Acoustics
9
0

How do I apply a discrete velocity/acceleration constraint to an FE subsystem?

How do I apply a discrete velocity/acceleration constraint to an FE subsystem?
An acceleration or velocity constraint can be applied to the node of an FE subsystem using the "large mass method". read more
Vibro-Acoustics
15
0

How does licensing of beta versions of VA One work?

How does licensing of beta versions of VA One work?
How does licensing of beta versions of VA One work?, Beta versions of VA one require a license with... read more
Vibro-Acoustics
8
0

How can I get an accurate Radiation Loss Factor to use in my SEA model?

How can I get an accurate Radiation Loss Factor to use in my SEA model?
One can use a hybrid model with an FE subsystem with an FE face connected to a SIF, and calculate the radiation efficiency. From this the radiation loss factor can be calculate read more
Vibro-Acoustics
36
0

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