High speed, amplitude variable thrust control method

Details High speed, amplitude variable thrust control method High speed, amplitude variable thrust control method

1993-10-18

1995-07-11

Bertsch, Richard A.

Power plants

Reaction motor

Method of operation

60233, 60258, 2391022, 2511292, B63H 1100

Patent

active

054310105

ABSTRACT:
A high speed control apparatus and method utilized in a system having a high pressure fluid supply for producing precisely controlled, amplitude and duration variable thrust are disclosed, the apparatus including a piezoelectric stack responsive to a control signal input, a displacement amplifier operatively associated with the stack, and a high pressure axial valve assembly coupled with the amplifier. A microprocessor control system and energy storage and power amplifier system provide the calibrated output voltage control signal which drives the piezoelectric stack in such a manner as to produce rapidly changing displacements in the stack (as frequent as 10 microseconds) which are subsequently amplified by the displacement amplifier. The valve assembly opens as the piezoelectric stack expands upon application of a step change in voltage, allowing fluid to expand through the valve assembly and create thrust that is substantially equal in duration and directly proportional in amplitude to the control signal.

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