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APPLICATION OF GIANT MAGNETOSTRICTIVE MATERIAL TO DISC BRAKE ACTUATOR
Yutaka OGAWA,Yukio MURATA,kazuo KAWASE,Hiroyuki WAKIWAKA,Tsutomu MIZUNO,Hajime YAMADA 전력전자학회 1998 ICPE(ISPE)논문집 Vol.- No.-
For the next generation railway brake system, a disc brake which can be operated directly and electrically is strongly expected. This paper deals with newly developed disc brake actuator using giant magnetostnctive materials (GMM) which can be integrated with disc brake Regarding the brake system performance, a better delay time was also attained which will contribute to shorten a stopping distance.<br/>
Visualization of Underwater Sympathetic Detonation of High Explosives
Itoh, Shigeru,Hamada, Toru,Murata, Kenji,Kato, Yukio The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.12
The experiment for the sympathetic detonation (Sudo et al., 1951) (Fukuyama et al., 1958) in water was conducted. Composition B (RDX: 64%, TNT: 36%, Detonation velocity: 7900m/s) was used for both donor (the thickness was 50mm, and the diameter was 31mm) and receptor charges. The distance between the donor and the receptor, and the thickness (5, 7.5, 10mm) of the receptor were varied in the experiments. In order to investigate the basic characteristics of the underwater sympathetic detonation of high explosive, the sympathetic detonation phenomena were visualized by a high-speed camera (HADLAND PHOTONICS, IMACON790) in forms of streak and framing photographs. The 200ns/mm streak velocity was 2㎲. Manganin gauges (KYOWA Electronic INSTRUMENTS CO. SKF-21725) were used for the pressure measurements. The gauges were set under the receptor. The pressures during the complete and incomplete explosions were measured.