油圧回路の脈動特性を考慮したサイドブランチの最適設計(流体工学,流体機械)

概要

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It is well known that all positive displacement pumps generate a flow pulsation which interacts with the system to produce a pressure pulsation. This pressure pulsation is a periodic function of time with a fundamental frequency and higher harmonics. Therefore, if the change of pump rotational speed in the operation cycle is not large such as in a hydraulic excavator, folk lift, an injection molding machine, etc., the harmonic frequencies of pressure pulsation would be almost fixed. For these kinds of hydraulic systems, a quarter wavelength side branch has been widely used for attenuating the pressure pulsation. In this paper, an effective design method for the insertion of the quarter wavelength side branch is described. An optimum design calculation used in this study searches the design parameters such as lengths and an insertion position of the side branch by taking account of wave propagation characteristics of the all circuit elements. The design results were examined by both the theoretical calculation and the experimental results, and the designed side branch showed good attenuation performance in the certain hydraulic circuit.
2008-04-25