| 摘要 |
<p>A controlled acceleration platform (32) which provides a horizontally quiet platform capable of accurate acceleration and angular control. An object at or near the center of percussion of the pendulum assembly experiences reduced seismic and cultural ground vibration, and experiences negligible hysteresis and stiction for minute adjustment in inclination. By ridigly attaching the device to a single pivot or flexure (36) so as to isolate the accelerometer (42) from seismic or cultural vibration, the small tilt associated with pendulous motion at the proper radius from the flexure completely cancels the inertial term. The suspended item is also isolated from small error producing effects such as earth tide, local ground swell from solar heating, and far field gravity changes as produced by the sun and the moon. The lateral acceleration sensed by the suspended item may be adjusted by controlling tilt of the platform. This can be done by adding weight at a distance from the center line. With an accelerometer attached, the platform can also be used to measure very minute applications of force.</p> |
