著者

Katsuhiko SANDO Takeshi YAMAMOTO Kenji SAWADA Tomoyuki TANIGUCHI Nobuyuki SOWA Hiroki MORI Takahiro KONDO

出版者

The Japan Society of Mechanical Engineers

雑誌

Mechanical Engineering Journal (ISSN:21879745)

巻号頁・発行日

vol.8, no.2, pp.20-00497, 2021 (Released:2021-04-15)

参考文献数

11

被引用文献数

1

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This paper describes a design method of a friction reducer device using a loading cam to suppress unstable vibration. Nonlinear simulation and energy analysis of numerical solutions demonstrates that destabilization is caused by the large phase difference between the slipping velocity in the translation direction and that in the rotation direction. It was found that similarly unstable vibration occurs in various structures using wedge rollers with translational and rotational motion. The analytical equation could be simplified by focusing on the motion factor that affects the slip velocity of the power transmission surface, which is the factor of vibration. Consequently, the design method for suppressing vibration could be expressed by a mathematical formula. This equation is validated by using the results of experiments conducted in the previous work of the current authors. Furthermore, from this equation, we proposed that vibration could be suppressed by the parameter balance of the power transmission device without using damping. The power transmission surface slips when a quick torque is input and damping is used. The proposed design can handle a quick torque response and reduce the weight of the reducer. Specifically, the shape of the wedge roller is made lighter, so that the moment of inertia of the roller is not lowered, or the wedge roller is set as a small roller.

著者

Kota Teramoto Kiyoshi Ohishi Takahiro Kondo Shingo Makishima Keiichi Uezono Shinobu Yasukawa

出版者

The Institute of Electrical Engineers of Japan

雑誌

IEEJ Journal of Industry Applications (ISSN:21871094)

巻号頁・発行日

vol.3, no.1, pp.75-85, 2014-01-01 (Released:2014-01-01)

参考文献数

25

被引用文献数

3 7

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Trains require high deceleration and stable traveling performance. Improvement in adhesion characteristics is, thus, very important for electric trains. We have previously proposed an anti-slip/skid re-adhesion control system that is based on a disturbance observer and possesses a high adhesion force utilization ratio. In the present work, we focus on the deceleration mode. Generally, a train has an electric regenerative brake (electric brake) and an air brake (mechanical brake). Under wet railway track conditions, the regenerative brake may be suspended because of the air brake response. This paper proposes a regenerative brake priority control and an electro-pneumatic blended braking control based on an estimated adhesion coefficient. Furthermore, this paper evaluates and discusses regenerative brake priority control using numerical simulations.

著者

Katsuhiko SANDO Takeshi YAMAMOTO Kenji SAWADA Tomoyuki TANIGUCHI Nobuyuki SOWA Haruki MORI Takahiro KONDO

出版者

The Japan Society of Mechanical Engineers

雑誌

Mechanical Engineering Journal (ISSN:21879745)

巻号頁・発行日

pp.20-00497, (Released:2021-03-03)

参考文献数

11

被引用文献数

1

---

This paper describes a design method of a friction reducer device using a loading cam to suppress unstable vibration. Nonlinear simulation and energy analysis of numerical solutions demonstrates that destabilization is caused by the large phase difference between the slipping velocity in the translation direction and that in the rotation direction. It was found that similarly unstable vibration occurs in various structures using wedge rollers with translational and rotational motion. The analytical equation could be simplified by focusing on the motion factor that affects the slip velocity of the power transmission surface, which is the factor of vibration. Consequently, the design method for suppressing vibration could be expressed by a mathematical formula. This equation is validated by using the results of experiments conducted in the previous work of the current authors. Furthermore, from this equation, we proposed that vibration could be suppressed by the parameter balance of the power transmission device without using damping. The power transmission surface slips when a quick torque is input and damping is used. The proposed design can handle a quick torque response and reduce the weight of the reducer. Specifically, the shape of the wedge roller is made lighter, so that the moment of inertia of the roller is not lowered, or the wedge roller is set as a small roller.