Acoustic positioning and orientation prediction

Details Acoustic positioning and orientation prediction Acoustic positioning and orientation prediction

1988-11-15

1990-10-23

Chapman, John

Measuring and testing

Speed, velocity, or acceleration

Angular rate using gyroscopic or coriolis effect

G01K 1500

Patent

active

049643037

ABSTRACT:
A method for use with an acoustic positioner, which enables a determination of the equilibrium position and orientation which an object assumes in a zero gravity environment, as well as restoring forces and torques on the object, of an object of arbitrary shape in a chamber of arbitrary configuration. An acoustic standing wave field is established in the chamber, and the object is held at several different positions near the expected equilibrium position. While the object is held at each position, the center resonant frequency of the chamber is determined, by noting which frequency results in the greatest pressure of the acoustic field. The object position which results in the lowest center resonant frequency, is the equilibrium position. The orientation of a nonspherical object is similarly determined, by holding the object in a plurality of different orientations at its equilibrium position, and noting the center resonant frequency for each orientation. The orientation which results in the lowest center resonant frequency is the equilibrium orientation. Where the acoustic frequency is constant but the chamber length is variable, the equilibrium position or orientation is that which results in the greatest chamber length at the center resonant frequency.

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E. Leung et al., "Resonance Frequency Shift of an Acoustic Chamber Containing a Rigid Sphere," J. Acoust. Soc. Am. 72 (2), Aug. 1982, pp. 615-620.
Morse, Vibration and Sound, (McGraw Hill, N.Y., 1948) pp. 389-401.
Oran, W. A., et al., "Parametric Study of an Acoustic Levitation System", Rev. Sci. Instrum., vol. 51, No. 5, May 1980.

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