123 有限インピーダンスの端部を有する枝管の脈動低減効果に関する研究 : 第1報,理論的検討(低周波・超低周波音(2),騒音・振動評価・改善技術)

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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. However the long side-branch is necessary to reduce the low frequency noise because of the relation f=c/4L. Where L is the side-branch length. In this paper, the noise reduction effect of the side-branch with the finite impedance end is examined theoretically and experimentally. As a result, it was clarified that the side-branch with the finite impedance end gives the reduction effect in frequency range lower than that of the rigid end.
一般社団法人日本機械学会の論文
2006-07-11