Fluid reaction surfaces (i.e. – impellers) – With control means responsive to non-cyclic condition... – Impeller rotation speed responsive
Reexamination Certificate
2006-01-17
2006-01-17
Look, Edward K. (Department: 3745)
Fluid reaction surfaces (i.e., impellers)
With control means responsive to non-cyclic condition...
Impeller rotation speed responsive
C060S791000, C060S039281
Reexamination Certificate
active
06986641
ABSTRACT:
A power turbine speed control system for a helicopter is disclosed which includes components for generating a power turbine speed signal based upon a demanded rotor speed, a high-order filter for filtering the power turbine speed signal by effectuating a rapid attenuation of main and tail rotor torsional frequencies in the power turbine speed signal without compromising phase at low frequencies, and a governor for providing isochronous power turbine speed and rotor speed control based upon the filtered power turbine speed signal.
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Wong, T.H., “Designing and Stimulating the Engine Speed Governor for Helicopter Applications,” ASME International Gas Turbine and Aeroengine Congress and Exposition, Jun. 5-8, 1995, XP0080211719.
Desai Mihir C.
Mattice Jeffrey S.
Stanecki Tomasz J.
Edgar Richard A.
Edwards & Angell LLP
Goodrich Pump & Engine Control Systems, Inc.
Look Edward K.
Silvia David J.
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