Measuring and testing – Instrument proving or calibrating – Volume of flow – speed of flow – volume rate of flow – or mass...
Patent
1990-10-12
1993-04-20
Raevis, Robert
Measuring and testing
Instrument proving or calibrating
Volume of flow, speed of flow, volume rate of flow, or mass...
G01P 2100
Patent
active
052031993
ABSTRACT:
A controlled acceleration platform 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 rigidly attaching the device to a single pivot or flexure so as to isolate the accelerometer from seismic or cultural vibration, the small tilt associated with pendulus 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. The pendulus platform can be used to calibrate accelerometers through the addition or removal of weight at a distance from the center of gravity or by the relatively large lateral displacement of a small mass. A supporting platform for the pendulus platform is provided with either passive or active damping (or both). When damping of the supporting structure is used, this is not sensed by a horizontally mounted accelerometer under test as the damping takes place external to the pivot point of the pendulus platform and thus the accelerometer positioned at the center of percussion is not appreciably affected.
REFERENCES:
patent: 3294467 (1966-12-01), Rademakers
patent: 3350916 (1967-11-01), Bock
patent: 3672473 (1972-06-01), Verhagen
patent: 4003241 (1977-01-01), Thomas
patent: 4158956 (1979-06-01), Vadasz Fekete
patent: 4166406 (1979-09-01), Maughmer
patent: 4220044 (1980-09-01), LeBlanc et al.
patent: 4576034 (1986-03-01), Ferree et al.
patent: 4869092 (1989-09-01), Bernard et al.
Clark, "An Improved Method for Calibrating Reference Standard Accelerometers", Metrologia 19, 103-107 (1983).
Ingebritsen, "Methods for Calibrating Motion Measuring Transducers at Low Frequencies", Inst. Society of America, 22nd Annual ISA Conference and Exhibit, Sep. 11-14, 1967, Chicago, Ill.
Henderson Frederick H.
Joyce, Jr. Hardin
Thorne Arthur R.
Raevis Robert
Teledyne Industries Inc.
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