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Pressure fluctuation occurs in an oil pressure pump in the nature of the machine. It becomes a cause of a vibration and a noise of a building where the oil pressure pump are set because the pressure fluctuation gives a fluctuating force on floors and walls of the building. So it is important to reduce the vibration and noise from an environmental point of view. A side branch is often used to reduce the pressure fluctuation because of its simplicity and its effectiveness. In this paper, the side-branches are applied to the real pumps and the reduction effects are described. As 2nd and and harmonics of the pressure fluctuation are dominant in this pump, two side branches are used to reduce each harmonics components respectively. As a result, the vibration of wall and the interior noise of the room were suppressed violently. And it was clarified that the reduction mechanism is not resonance but the superposition of two fluctuating weves which are the progressive and reflective waves.

A Consideration of Reduction Effect of Side Branch on Pressure Fluctuation