Tips & Tricks

Radiation Efficiency from HAJ is dependent on loading - is that expected?

This is expected, as the Radiation efficiency will depend on which modes you excite. From help: "For an FE subsystem the radiation efficiency indicates the in-situ radiation efficiency (rather than the radiation efficiency of the resonant modes of the panel). The radiation efficiency of a structural FE subsystem depends on its response (i.e. depends on the loading, damping, coupled subsystems, etc...)."

Using results from the periodic subsystems module in my SEA model

Where do I use results from the periodic subsystems module in my SEA model?

Does using imported NASTRAN damping matrices add much to the solve time?

Import may take some extra time, but this should not be significant. Also, the fully populated damping matrix shouldn't make much difference in the solution time as we don’t use a sparse matrix for the modal matrix. As soon as you have hybrid or many different things that matrix gets fully populated anyway

Apply user defined radiation efficiency

To enforce the radiation efficiency of a shell, you need to modify the coupling loss factor between the shell and connected cavity, or the radiation loss factor

How do I get the hybrid TL using scripting (Python)?

Python can be used efficiently to create scripts, for this articlea sript to calculate the hybrid TL is given as an example

Importing (ANSYS) Modal results - normalization

Care must be taken to ensure that the correct units are selected when importing the modal results,

Difference in Hybrid TL calculated with DAF and SIF's

When the hybrid TL is calculated, the TL will be the same irrespective of the side the NCT is applied,

How do I get acceleration by scripting in VA One?

Acceleration is a quantity derived from velocity. Easiest is to loop over velocity data and calculate: a = i*ω*vel and ω = 2*pi*freq a) RMS_a: a = ω * vel b) PSD_a: a2/bandwidth c) PSD_g: (a/g)2/bandwidth where "bandwidth" can be retrieved by using: bandwidth = pi_fFreqDomainGetBandwidth(fdom, BandIndex)

Adding lumped mass to FE model in VA One

How do I add lumped mass to FE model in VA One? To add lumped mass in FE models in VA One, Select from the toolbar Solve -> Options -> Structural FE Solver.

Warning: damping for wavefield Source/Receiver is zero

The VTL report warnings : damping for wavefield Source/Receiver is zero - what does it mean? The VTL often report warnings like : Warning: damping for wavefield Source is zero Warning: damping for wavefield Receiver is zero