Tuned ground motion detector utilizing principles of mechanical

Details Tuned ground motion detector utilizing principles of mechanical Tuned ground motion detector utilizing principles of mechanical

1975-04-07

1976-11-02

Sebastian, Leland A.

Communications: electrical

Selective

Interrogation response

73 71, 73 712, 181122, G01V 116

Patent

active

039900398

ABSTRACT:
A mechanically resonant ground motion sensor having a frequency response which is "tuned" to discriminate between applied vibrational forces which are destructive and those which are not. The basic operating principle of the sensor is that of an oscillating mass whose dynamic response to applied forces takes the form of viscously damped harmonic motion. The disclosed embodiments include a horizontal ground motion detector based on the movement of a pendulum in a viscous fluid and a vertical ground motion detector utilizing a vertically sprung dashpot cylinder moving through a viscous fluid. The detector is tuned to trigger a tripping mechanism in response to accelerations above a threshold value and within the critical range of destructive frequencies. Tuning is accomplished through appropriate selection of the various design parameters including the active surface area upon which the viscous force acts, the fluid gap between moving and stationary surfaces, the weight of the moving element and the fluid viscosity. The sensor may be used to disable or deactivate systems such as elevators or gas lines which may become life endangering during a destructive earthquake.

REFERENCES:
patent: 2659065 (1953-11-01), Cordell
patent: 2780301 (1957-02-01), Jakosky
patent: 3286229 (1966-11-01), Millis
patent: 3297982 (1967-01-01), Beach
patent: 3359538 (1967-12-01), Raphael
patent: 3685011 (1972-08-01), Lehner

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