日本フルードパワーシステム学会論文集
Online ISSN : 1349-7022
Print ISSN : 1880-3121
ISSN-L : 1349-7022
36 巻, 3 号
選択された号の論文の4件中1~4を表示しています
研究論文
  • 尹 鍾晧, 村松 久巳, 川嶋 健嗣, 香川 利春
    2005 年 36 巻 3 号 p. 59-65
    発行日: 2005年
    公開日: 2006/07/07
    ジャーナル フリー
    This research examines the noise characteristics of a slit structure by changing it's height and outer diameter. The slit structure consists of several disks shaped like round sections cut from a cylinder pipe that have been piled up. Compressed fluid enters the center of the piled-disk cylinder and is exhausted through a slit from the inside region to the outside. Because the pressure reduction is performed by a smooth flow through the slit, very quiet pressure reduction can be performed without causing flow turbulence or generating a shock wave. The relation of the Reynolds number and the noise level was clarified, and the visualization equipment was used to check for existence of a shock wave. The results obtained are summarized as follows. (1) When the height of the slit increases, the noise level increases. But, when upstream pressure is 300KPa or greater, regardless of the height and the outer diameter, there is a silencing effect more than 30dB. (2) When the upstream pressure was 600kPa, it was confirmed with visualization equipment that a shock wave did not occur in the slit type structure. (3) When the Reynolds number at exit increases, the noise level increases. Also the characteristics of the noise level is changed near the 2500 Reynolds number. (4) The noise effect increases, when the height of slit decreases and the outer diameter increases.
  • 朴 聖煥, 北川 能
    2005 年 36 巻 3 号 p. 66-73
    発行日: 2005年
    公開日: 2006/07/07
    ジャーナル フリー
    This study is concerned with the dynamic analysis of the main poppet of two-stage water hydraulic high speed solenoid valve using Hardware-in-the-Loop Simulation (HILS). Since the behavior of a main valve of a two-stage water hydraulic high speed solenoid valve is difficult to measure, HILS technology is applied as an efficient and a precise method for the analysis of dynamic characteristics of this valve. In order to apply HILS to this valve, a dynamic modeling of the main valve is derived. From the results of HILS analysis, it is confirmed that the dynamic characteristic of the main valve is satisfactory. Furthermore, the validity of HILS analysis of this study is verified by experiment.
  • 柳田 秀記, 今泉 敏行, 吉田 豊, 大久保 不二男, 川上 喜紀, 松田 一生
    2005 年 36 巻 3 号 p. 74-80
    発行日: 2005年
    公開日: 2006/07/07
    ジャーナル フリー
    This paper presents experimental results of the performance of two types of electrostatic filter for insulating liquids that utilize both AC and DC electric fields. The filters are cylindrical in shape and consist of a coagulating part, in which an AC electric field is applied to make minute contaminant particles become coagulated, and of a capturing part, in which a DC electric field is applied to capture the particles. The sole difference in the two types of filter is in the magnitude of the velocity gradient in the passage of the coagulating part. It is shown that the filtration speed is increased by utilizing both AC and DC electric fields compared to the case where only the DC electric field is used, and the usefulness of the electrostatic liquid filter proposed is demonstrated. Comparison between the performance of the two types of filter shows that the magnitude of the velocity gradient in the passage of the coagulating part strongly affects the filtration speed.
  • 斎藤 隆允, 鈴木 茂, 伊東 孝彦, 眞田 一志
    2005 年 36 巻 3 号 p. 81-87
    発行日: 2005年
    公開日: 2006/07/07
    ジャーナル フリー
    As a continuously variable transmission, authors proposed a fluid switching transmission system (FST) that could be a solution for energy saving. In this study, a highly precise model of the FST system was developed in order to analyze performance of the FST system by simulation. It was imperative to carry out detailed analysis of the energy loss of components, such as oil motor, oil pump, flywheels, hoses and joints, etc. Thermal dynamics determine oil temperature and viscosity which influence energy loss. Simulation results showed a good agreement with experimental results. A technique for building a highly precise simulation model of the FST system was established.
feedback
Top