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Featured researches published by Masami Ochiai.


International journal of fluid power | 2007

Characteristics of Flow Through Throttling Valve Undergoing a Steep Pressure Gradient

Xin Fu; Xuewen Du; Jun Zou; Hong Ji; Shohei Ryu; Masami Ochiai

Abstract This paper presents predictions and measurements of the structures of cavitation flow inside the throttling valve. The three-dimensional Navier-Stokes equations in a moving reference frame are solved on tetrahedral meshes. A sliding mesh technique is utilized to characterize unsteady interactions. The accuracy of the predicted flow fields is evaluated by comparison to measurement results taken with a high-speed camera. Results show that the pressure distribution inside the throttling groove is sensitive to the valve port configuration and flow direction. Bubbles form near the side wall of the groove on the throttling edge where, in the case of flow into the throttling groove, the pressure is at a minimum. With the increase of the pressure gradient bubbles saturate the flow. Noise spectrum analysis indicates that the noise level induced by cavitation is determined by the number and size of the bubbles passing through the valve grooves.


Archive | 1997

Apparatus for diagnosing failure of hydraulic pump for work machine

Yasuo Tanaka; Masami Ochiai; Takashi Yagyu; Akira Hashimoto; Yoshinori Furuno; Yutaka Watanabe; Yukihiko Sugiyama


Archive | 1988

Flow control valve apparatus

Ken Ichiryu; Takashi Kanai; Masami Ochiai; Yuusaku Nozawa; Hideyo Kato


Archive | 2001

Drive control device for hybrid construction machine, hybrid construction machine and drive control program therefor

Eiji Egawa; Hirotsugu Kasuya; Toru Kurenuma; Masami Ochiai; Shuji Ohira; Seiji Yamashita; 修司 大平; 誠二 山下; 榑沼 透; 栄治 江川; 博嗣 糟谷; 正巳 落合


Proceedings of the JFPS International Symposium on Fluid Power | 2008

HYBRID IN CONSTRUCTION MACHINERY

Masami Ochiai; Shohei Ryu


Archive | 2001

Pressure oil energy recovering device and construction machine with the same

Eiji Egawa; Hirotsugu Kasuya; Toru Kurenuma; Masami Ochiai; Shuji Ohira; Shiyouhei Riyuu; Junji Tsumura; Seiji Yamashita; 小平 劉; 修司 大平; 誠二 山下; 榑沼 透; 栄治 江川; 淳二 津村; 博嗣 糟谷; 正巳 落合


Archive | 1988

Solenoid operated valve apparatus

Ken Ichiryu; Takashi Kanai; Masami Ochiai; Nobuhiko Ichiki


Archive | 2003

Hybrid construction vehicle

Eiji Egawa; Masami Ochiai; Mitsuo Sonoda; Seiji Yamashita; 光夫 園田; 誠二 山下; 栄治 江川; 正巳 落合


Archive | 2000

Swivel control apparatus

Tsutomu Udagawa; Teruo Igarashi; Masami Ochiai; Toshimi Sakai; Kazuhisa Ishida; Kouji Funato


Archive | 2005

Control valve apparatus and pressure circuit

Kazuo Takiguchi; Masami Ochiai; Tsutomu Udagawa; Katsumi Ueno; Takashi Yagyu; Yukihiko Sugiyama; Mitsuo Aihara

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Yutaka Watanabe

Hitachi Construction Machinery

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Genroku Sugiyama

Hitachi Construction Machinery

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Hirotsugu Kasuya

Hitachi Construction Machinery

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Takashi Kanai

Hitachi Construction Machinery

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Eiji Egawa

Hitachi Construction Machinery

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Hideyo Kato

Hitachi Construction Machinery

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Shuji Ohira

Hitachi Construction Machinery

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Takashi Yagyu

Hitachi Construction Machinery

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Tsutomu Udagawa

Hitachi Construction Machinery

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