than in open air conditions. Instead of spreading out through the environment, the wave is contained in the pipe. Therefore, the amplitude of the wave does not diminish strictly due to distance away from the source. The amplitude is reduced through damping in the media and friction losses in the pipe. Due to these effects, pressure wave fluctuations in a pipe, due to various sources, can travel a long distance without much loss in amplitude. Planar waves can travel in a wide range of frequencies with little restriction.
The other important aspect of a planar wave in a pipe is that the pulse does not directly contact the pipe wall except at bends and reducers or other obstructions. This aspect makes it difficult for a planar wave to couple with a pipe wall or shell mode of a pipe. A planar wave can cause pipe walls to expand and contract due to the change in pressure between the peaks of the pulsation, which will cause the pipe to exhibit a forced response at a defined frequency corresponding to the planar wave.
than in open air conditions. Instead of spreading out through the environment, the wave is contained in the pipe. Therefore, the amplitude of the wave does not diminish strictly due to distance away from the source. The amplitude is reduced through damping in the media and friction losses in the pipe. Due to these effects, pressure wave fluctuations in a pipe, due to various sources, can travel a long distance without much loss in amplitude. Planar waves can travel in a wide range of frequencies with little restriction.The other important aspect of a planar wave in a pipe is that the pulse does not directly contact the pipe wall except at bends and reducers or other obstructions. This aspect makes it difficult for a planar wave to couple with a pipe wall or shell mode of a pipe. A planar wave can cause pipe walls to expand and contract due to the change in pressure between the peaks of the pulsation, which will cause the pipe to exhibit a forced response at a defined frequency corresponding to the planar wave.
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