Role of Mounts In NVH
Role of Mounts In NVH
(OP)
I would like to know the Role of the Mounts in NVH. I do understand them as the members, which isolates two systems from being coupled. Other then this what are the NVH criteria’s which drive the mount stiffness tuning? Please explain..
Thanks,
Thanks,





RE: Role of Mounts In NVH
Mounts with less damping tend to give better attenuation except at resonance.
However the above two rules of thumb ignore the crucial aspect of resonances, as in your other thread.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Role of Mounts In NVH
RE: Role of Mounts In NVH
The mounts do not isolate (rather amplify) at the mounted resonant frequency, resonance of the source , receiver and the internal resonance of the mounts themselves. Hence while using mounts for noise control through vibration control we should consider these in mind.
In practical applications, we may not achieve the transmissibility characteristics of the SDOF model whihc is provided by mount manufacturers.
RE: Role of Mounts In NVH
RE: Role of Mounts In NVH
2) figure out the main vibration frequency problems you are going to have, and then select your suspension frequency appropriately.
3) you are unlikely to get much more than 25 dB attenuation across a rubber mount.
Cheers
Greg Locock
SIG:Please see FAQ731-376: Eng-Tips.com Forum Policies for tips on how to make the best use of Eng-Tips.
RE: Role of Mounts In NVH
Hence we need to have an eye on the natural frequencies in the translational and rotational mounted frequencies as well. Normally, we tend to select mounts to isolate vibrations in vertical directions only.(the usual SDOF transmissibility curve provided by manufacturer) If your exitations (forces or moments) happens to be in other directions also, beware of it.
RE: Role of Mounts In NVH
RE: Role of Mounts In NVH
The questions you're asking are so basic as to be answered very well in virtually any mounts handbook (e.g., Barry Controls, Lord, etc.), or any elementary text on vibration.
RE: Role of Mounts In NVH