Means for adjusting the area of an orifice in a vibration system
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United States of America Patent
Stats
-
Jan 1, 1980
Grant Date -
N/A
app pub date -
Apr 19, 1978
filing date -
Apr 19, 1978
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A spherical shaped plate and an orifice opening are oriented such that the edge of the plate can span and cover part of the orifice opening. Stops are provided to prevent a full 360.degree. rotation. The plate shape and wedge opening can be configured such that, as the angular position of the plate changes, the orifice area changes according to the predetermined relationship. The plate and the opening may be enclosed in a gas tight housing, with a stepping motor exterior to the housing coupled via a shaft passing through the housing to the plate. The plate angular position versus orifice area relationship is determined in combination with a desired linear angular position versus gas pressure curve, for use in copending patent application Ser. No. 897,821, filed herewith entitled 'Quasi-Random Pneumatic Vibration Facility and Automatic Frequency Modulating System Therefor' by Henry T. Abstein, Jr., Dennis B. Page, James M. Kallis, Charles F. Talbott, Jr. and Richard L. Baker.
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Cited Art Landscape
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