Cyrogenic cooling system with active vibration control

Details Cyrogenic cooling system with active vibration control Cyrogenic cooling system with active vibration control

1993-12-22

1995-05-09

Wayner, William E.

Refrigeration

Gas compression, heat regeneration and expansion, e.g.,...

60520, F25B 900

Patent

active

054129516

ABSTRACT:
A cryogenic cooling system having a mechanism for canceling vibration at a fundamental frequency and at harmonics thereof. The inventive system includes a first apparatus (28, 32) for cooling a mass. The first apparatus (28, 32) creates a vibration at a first frequency and a second frequency. In a typical application, the first frequency is a fundamental frequency and the second frequency is a harmonic of the first frequency. Often several harmonics are present. The invention includes a second apparatus (30, 34) for substantially eliminating vibration at the first frequency and a third apparatus (48, 50) for substantially eliminating vibration at the second frequency. The second apparatus includes a mass (30) and a motor (34) for driving same. The mass (30) is disposed to counter the vibration created by the first apparatus when the motor (34) is driven by a first current. The third apparatus includes a sensor (48) for detecting the vibration at the second frequency and providing an output in response to a sensed force F resulting therefrom. The third apparatus further includes a feedback circuit (50) for providing a second current for driving the motor. The second current is the sum of the first current and a feedback current I.sub.b2. The feedback current I.sub.b2 is equal to -G.sub.f (s)F, where -G.sub.f (s) is a feedback transfer function. The feedback transfer function is a product of a first transfer function H.sub.I (s) representing dynamics of the second apparatus required to cancel the vibration at the first frequency and a second transfer function G.sub.D (s) representing the dynamics of the second means required to cancel the harmonic vibration.

REFERENCES:
patent: 4567726 (1986-02-01), Vitale et al.
patent: 5245830 (1993-09-01), Aubrun et al.

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