Peak accelerograph

Details Peak accelerograph Peak accelerograph

1975-06-27

1976-08-10

Hartary, Joseph W.

Recorders

Record tracer movement responsive to inertia or mass...

73515, 346 77R, 346139R, G01D 1502

Patent

active

039745040

ABSTRACT:
A three-axis instrument for recording peak accelerations in earthquakes and like kinds of shocks. Recording is by scratches made by hard styli on small metal record plates. No power source and no maintenance are required. The seismic recording elements have novel configurations of mass, spring, and lever arm which permit improved combinations of sensitivity and natural frequency for any given magnitude of stylus friction. For example, a sensitivity of 0.25 cm per g with a natural frequency of 32 Hz may be attained, where error due to a stylus frictional force of 70 mg is less than 1 percent of full-scale. Both hydraulic and magnetic dampers are employed. The latter also provide motional electrical signals for use in calibration.

REFERENCES:
patent: 2959459 (1960-11-01), Ryan
patent: 3740757 (1973-06-01), Engdahl
patent: 3795006 (1974-02-01), Engdahl

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