Measuring and testing – Vibration – Vibrator
Patent
1982-01-18
1984-05-08
Birmiel, Howard A.
Measuring and testing
Vibration
Vibrator
73665, 181121, B06B 110
Patent
active
044467427
ABSTRACT:
A seismic testing apparatus is provided in which linear motion or excitation of a horizontally disposed table is achieved simultaneously along three mutually orthogonal axes by means of independently operable hydraulic-actuator assemblies. Rotational or torsional motion of the table about the linear excitation axes is resisted by separate, mechanical rotation-inhibiting means each consisting of a torsionally rigid structure disposed parallel to the table and perpendicularly to their respective associated axes of excitation. The torsionally rigid structures are each connected to the table at two spaced-apart points, with all four points of connection lying in the same plane.
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Leist, Jr. Theodore H.
Thompson, Jr. Jack M.
Birmiel Howard A.
Structural Dynamics Research Corporation
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