Dear Muhammed Buhari,

You have to be more precise than that and define your subject. For example: regulations on NVH regarding {electric machines} in the field of {medical electrical equipements}.

Also, you could be talking about standards for experimentation or standards for limitations of NVH (ex: 60 dB(A) @ 1 meter).

International regulation on NVH under (Heavy duty trucks)

So you would have:

ISO 362-1:2015

https://www.iso.org/standard/59760.html

ISO 362-2:2009

https://www.iso.org/standard/42211.html

ISO 5130:2007

https://www.iso.org/standard/38663.html

I will drop some of the search i made on how Vibrations can be reduced for heavy duty trucks