Abstract
Unwanted noise and vibration in piping systems, generated by pumps, valves, or orifices can be attenuated by flexible couplings. The efficiency of the resulting noise reduction is governed by the physical characteristics of the devices and the distribution of energy between the pipe wall and the contained fluid. A good attenuator must reduce both fluid-borne and structure-borne noise. Experiments confirm the analytical prediction of energy distribution for acoustic and mechanical excitation of the system. Further experiments on various 4-in.-diam flexible couplings demonstrate their relative noise reduction characteristics for fluid- and structure-borne noise. A two-element right-angle configuration is shown to be even more than twice as efficient as one isolator, particularly at low frequencies.
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