Abstract
A toroidal resonator with a rigid barrier can be used to generate high-amplitude standing waves if the resonator is oscillated in a torsional mode about its central axis [S. Garrett, US Pat. No. 5,953,921 (Sept. 21, 1999)]. In the following, a 2-1/2-in diameter schedule-40 steel pipe is bent into a 13-in radius torus to form the resonator. The torus is then deformed along its cross section to detune harmonic overtones and suppress shock wave formation. The torsional drive force is provided by rigidly attaching the resonator to the housing of a modified Lynx Model T468 Direct-Drive Servo Motor [Kessinger et al., US Pat. No. 5,744,896 (April 28, 1998)]. The resonator/motor housing and shaft/rotor assemblies are made into a mechanical 2-DOF torsional oscillator by coupling their moments-of-inertia through an elastic restoring force. The torsional restoring force is provided by a quartet of semi-cylindrical stainless steel (17-7 PH) springs mounted between the resonator/housing and shaft/rotor assemblies. Measurements of modal anharmonicity and peak acoustic pressures at resonance will be reported and compared to DeltaE model results. [Work supported by the Office of Naval Research.]
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