Engine control system
First Claim
Patent Images
1. A power turbine speed control system for a helicopter comprising:
- a) means for generating a power turbine speed signal based upon a demanded speed;
b) means 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;
c) a governor for providing isochronous power turbine speed and rotor speed control based upon the filtered power turbine speed signal; and
d) damping means for actively damping main and tail rotor torsional frequencies.
6 Assignments
0 Petitions
Accused Products
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.
25 Citations
7 Claims
-
1. A power turbine speed control system for a helicopter comprising:
-
a) means for generating a power turbine speed signal based upon a demanded speed; b) means 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; c) a governor for providing isochronous power turbine speed and rotor speed control based upon the filtered power turbine speed signal; and d) damping means for actively damping main and tail rotor torsional frequencies. - View Dependent Claims (2, 3, 4, 5, 6, 7)
-
Specification