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Hi, Tmoose: I could clearly feel vibrations in the pipes. The pipes were supported on the floor through vibrations dampeners. I measured the frequency response of these, but there was too much other noise/vibrations to get a good result. I have compared radiated sound power (efficiency = 1...

Hi, Thanks for the suggestions regarding literature. I am inclined to believe I am dealing with flow induced noise due to a very broad band noise spectrum. However when looking at a FFT of the noise tonal components are showing. The components can also be heard quite clearly. These I believe...

Hi Greg, Thank you for the answer. I presume that since the pipe is sort of driving the lagging, and the vibrations are measured on the lagging, that it is the lagging, which is radiating into the air and not the pipe. Your suggestion for measuring is also the way I would have done it myself...

Hi, I have tried to find information about the radiation efficiency of acoustic pipe insulation. Thing is I have lots of good measurement data of the vibrations of insulation covered pipes, from which I need to calculate the radiated sound power. The insulation is ISO class A, it was not...