Use of Pipewall Vibrations to Measure Valve Noise
Por Allen C. Fagerdun
1 January 1988, (USA)
Acoustic energy generated by fluid flow through a control valve propagates through the piping and creates a fluctuating pressure field which forces the pipewalls to vibrate. These vibrations in turn cause pressure disturbances outside the pipe that radiate as sound.
When measuring the sound generated by a single control valve, multiple noise sources and reflected sound can make it difficult to determine what the measured value actually represents. In these instances, converting the vibration levels of the pipeline in which the valve is installed to an equivalent sound pressure level eliminates many of the measurement problems.
A study of sound transmission loss through the walls of commercial piping indicated the feasibility of converting pipewall vibrations to sound levels. Further study resulted in a valid conversion technique.