著者
桜井 康雄
出版者
日本物理教育学会
雑誌
物理教育
巻号頁・発行日
vol.37, no.1, pp.14-15, 1989

回転板上でミニカーをばねで回転中心につなぐ.質量mのミニカーの回転半径を求めるために,2つの発光ダイオードA,Bを用いる.Aは,回転板上5cmくらいの高さで回転板に平行に固定された支持捧の回転中心からrの位置に固定する.ミニカー上には水銀電池で発光するBがある.ダイオードA,Bが同じ位置にくるようにしたときのばねの張力Fをもとめる.つぎに回転板を直流モーターで回転させ,回転数を調節して,ダイオードA,Bが同じ位置にくるようにする.このときの角速度をωとすると,質量mのミニカーが半径r,角速度ωで回転しているとき中心向きにFの力を受けていることになる.F,m,r,ωのすべてのデータがわかるので,向心力の式F=mrω^2が成り立つことを確かめることができる.
著者
桜井 康雄 鈴木 教之 饗庭 健一 吉成 考正 川島 清隆 木原 和幸
出版者
一般社団法人 日本機械学会
雑誌
日本機械学会論文集C編 (ISSN:18848354)
巻号頁・発行日
vol.78, no.788, pp.1163-1169, 2012 (Released:2012-04-25)
参考文献数
4

In this paper, a component restricting pressure change caused by oil temperature change is proposed. One of the merits of an oil-hydraulic system is to keep the value of oil pressure when pressurized oil is enclosed in a container. However, it is impossible to keep the value when the temperature of the oil is changed. Using a pressure control sub-system to prevent it, the whole system becomes complicated. In addition to it, the energy is consumed when the pressure is adjusted by the quantity of the oil flowing into or out the container. From these view points, it is effective to develop the component which prevents the pressure change according to the oil temperature change without the control of the quantity of the oil. Therefore, in this paper, a component to prevent the pressure change based on the oil temperature change is proposed to make the merit of oil-hydraulic system certain when the temperature of the oil is changed. And, in the cases where the temperature of the oil is increased and where the temperature of the oil is decreased after it is increased, the basic characteristics of the component investigate experimentally.
著者
中田 毅 桜井 康雄 田中 和博
出版者
一般社団法人 日本フルードパワーシステム学会
雑誌
日本フルードパワーシステム学会論文集 (ISSN:18803121)
巻号頁・発行日
vol.39, no.1, pp.13-18, 2008 (Released:2009-08-28)
参考文献数
5
被引用文献数
1

This paper deals with the proposal of an electric-pneumatic hybrid drive system composed of an AC servomotor and a pneumatic cylinder type actuator, and its control methods. The rotational movement of the AC servomotor is transformed into the linear movement through a ball screw that is placed in the piston, and this hybrid drive system can be operated in the direction of gravitational force. Three control methods such as a pressure compensated control, a torque control and a hybrid control that combines both control methods are proposed from the view point of the reduction of the driving torque of the AC servomotor. The basic characteristics of the hybrid drive system are investigated by the experiment relating to the three control methods when the inertial mass moves vertically upwards and downwards during one cycle. Each control method is effective in reducing the driving torque of the AC servomotor and the views on the reduction of the driving torque of the AC servomotor in each control method are described.
著者
桜井 康雄 門井 寛人 中田 毅 枝村 一弥
出版者
一般社団法人 日本機械学会
雑誌
日本機械学会論文集 C編 (ISSN:03875024)
巻号頁・発行日
vol.72, no.715, pp.991-996, 2006
被引用文献数
6

By developing various electronic equipments with high performance, the dissipated power of electric chips used in those equipments has been increased. Therefore, it has been important to cool those electronic chips, and a liquid-cooling system has been employed for some electronic equipments. An Electro-Conjugate Fluid (ECF), which is one of functional fluids, has a remarkable property that a jet flow is generated between two electrodes when a high voltage is applied to the electrodes. By the use of this strong jet flow, a pump with simple structure, no noise and no vibration can be developed and a new liquid cooling system by ECF seems to be realized. In this study, to realize the liquid cooling system by ECF, an ECF-pump is proposed, in which four printed circuit boards are layered to make the pump size compact. The proposed pump is fabricated, and experiments are performed to investigate the basic characteristics of the pump. Furthermore, in the liquid cooling system with the proposed pump, experiments to cools a heat source are performed to investigate the possibility of achievement of the liquid cooling system by ECF.
著者
鈴木 信治 稲波 進 桜井 康雄
出版者
日本草地学会
雑誌
日本草地学会誌 (ISSN:04475933)
巻号頁・発行日
vol.15, no.1, pp.33-41, 1969-04-20
被引用文献数
6

アルファルファの60品種について,'65年と'66年に生育特性を検討し,品種を5群に群別した。その群別経過と各群品種の生育特性は次の通りであった。1.春の草丈伸長経過,草勢,刈取り後の再生,秋の草丈,草勢など14項目の調査形質にそれぞれ著しい品種間差異が認められ,各間の相関も高かった。2.群別の指標としてこれら形質を用い,その分級基準にしたがって区分し,最終的に群別指数を算出した。群別はこの群別指数によって行なった。3.I群品種は直立型で萠芽が早く,秋おそくまで生育し,夏の再生もよい。すなわち環境条件に鈍感な特性をもち極暖地適応品種と推定された。II群はI群ほど極端ではなく暖地適応品種と推定,III群は中間地に適応し,IV群はやや寒地型である。V群は葡伏型で萠芽,再生とも緩慢で刈取り利用期間も短く,環境に敏感に反応する寒地適応品種群と考えられる。4.以上の群別により品種の特性比較が容易になり,従来より幅広く,かつ系統的に暖地適応品種を知り得た。