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Featured researches published by Takafumi Fujita.


Journal of the Acoustical Society of America | 1983

Earthquake isolation floor

Jiro Ishida; Takafumi Fujita

An earthquake isolation floor comprises a horizontal plate-like support frame having a generally circular or polygonal configuration, a support frame having a horizontal surface with a similar configuration to that of the fundamental frame in a plan view, but of relatively smaller dimensions, a number of horizontal springs disposed radially between the fundamental and support frames with each of the springs being kept in a preset state, and a number of horizontal dampers disposed radially between the fundamental and the support frames, whereby machinery and tools, etc. to be protected against vibration such as caused by an earthquake are adapted to be mounted on the support frame.


Archive | 1992

Active/passive damping apparatus

Hiroshi Kurabayashi; Toshio Omi; Hiroshi Miyano; Takafumi Fujita


Archive | 1982

Anti-vibration apparatus for seismic acceleration

Toshio Omi; Takafumi Fujita; Goro Saito; Kozo Sakaba; Jiro Ishida


Archive | 1997

Seismic isolation sliding bearing for structure

Daisuke Mitsubishi Steel Mfg. Co. Ltd. Yaguchi; Hiroshi Kurabayashi; Toshio Omi; Nobuyuki Sone; Takeshi Someya; Hirokazu Hora; Akira Matsuda; Takafumi Fujita


Transactions of the Japan Society of Mechanical Engineers. C | 1985

A three-dimensional earthquake isolation device.

Takafumi Fujita; Sadayuki Kuramoto; Toshio Omi


Transactions of the Japan Society of Mechanical Engineers. C | 1987

Experimental Study of Multi-Stage Rubber Bearings Developed for an Isolation Floor for Earthquakes and Ambient Micro-Vibration

Takafumi Fujita; Fumio Mori; Nobuo Masaki; Yoji Suizu


Transactions of the Japan Society of Mechanical Engineers. C | 1987

Improvement of induction disk type relays for the prevention of malfunction under earthquake conditions.

Takafumi Fujita; Shinobu Hattori; Takayuki Koizumi


Transactions of the Japan Society of Mechanical Engineers. C | 1985

Earthquake Isolation Technology in the Present and the Future

Takafumi Fujita


Transactions of the Japan Society of Mechanical Engineers. C | 1983

An Earthquake Isolation Floor Using Pre-Tensed Springs : 1st Report, Fundamental Study on Earthquake Isolation Device

Takafumi Fujita; Shinobu Hattori; Jiro Ishida


Archive | 1983

特集4 : 各種構造物および機器モデルの地震応答観測 : 4.4三次元免震装置の振動実験と自然地震による応答観測

Takafumi Fujita; Sadayuki Kuramoto

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