General Workflow - Radiated Sound Analysis of vibrating component using NVHD

F. Beinhoff
F. Beinhoff Altair Community Member
edited February 15 in Community Q&A

Hello everyone,

I am working on a project that involves analyzing the sound radiation from a vibrating fiberglass component. Therefore, I want to use Altair NVH Director.

Here is some background information:

  • The component is part of a vehicle assembly.
  • It consists of two parts that are bolted together and vibrate in-plane, producing a rather low-pitched, dull noise (think of something like a vibrating sheet metal plate).
  • I have a (simplified) FE-model of the vehicle / component.
  • I have already done rattle analyses with Altair SnRD.
  • From this, some .hm, .fem, .pch and .h3d files are already available.
  • I have a measured acceleration signal (.csv) in the time domain that can excite the FE-model. This signal is also the source of the vibrations.
  • The goal would be to use this acceleration signal to excite the component(s) and subsequently analyze the radiated sound.
  • Later, the influence of e.g. stiffeners on the radiated sound should be investigated.

Here is my question:

How can I use Altair NVH Director to simulate the sound radiation from the component using the acceleration signal as the input?

I have looked at the NVHD user manuals available (for Full Vehicle NVH and High Frequency NVH), but I got the feeling that some steps described might be too complex for my case. Is there a possibility to use the already existing .h3d / .pch files from the rattle risk analysis (SnRD) also for my task in NVHD ?

Furthermore, I cannot find any tutorials or Use Cases that show how to set up such an NVH analysis and that explain the general workflow within NVHD. 

Could anyone please help me with this or point me to some useful resources that could be useful to approach my problem ?

I highly appreciate your assistance and thank you very much in advance.

Best regards,

Fabian Beinhoff

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