Accession Number : ADA136714

Title :   A Simulation Investigation of the Effects of Engine- and Thrust-Response Characteristics on Helicopter Handling Qualities,

Corporate Author : ARMY RESEARCH AND TECHNOLOGY LABS MOFFETT FIELD CA AEROMECHANICS LAB

Personal Author(s) : Corliss,L D ; Blanken,C L

PDF Url : ADA136714

Report Date : 15 Sep 1983

Pagination or Media Count : 21

Abstract : A program is being conducted to study the effects of engine response, rotor inertia, rpm control, excess power, and vertical damping on specific maneuvers included in nap-of-the-Earth (NOE) operations. Specifically, this study concentrates on the helicopter configuration with an rpm-governed gas-turbine engine and expands on handling qualities-criteria data by focusing on aspects peculiar to rotary-wing and NOE operations. This paper summarizes results of three moving-based piloted simulation studies and explores the frequency characteristics of helicopter thrust response which set it apart from other VTOL types. Power-system response is affected by both the engine governor response and the level of rotor inertia. However, results indicate that, with unlimited power, variations in engine response can have a significant effect on pilot rating, whereas changes in rotor inertia, in general, do not. Results also show that any pilot interaction required to maintain proper rpm control can significantly degrade handling qualities. Data for variations in vertical damping and collective sensitivity are compared with existing handling-qualities specifications, MIL-F-83300 and AGARD 577, and show a need for higher minimums for both damping and sensitivity for the bob-up task.

Descriptors :   *Helicopter engines, *Gas turbines, Speed regulators, Handling, Thrust, Flight paths, Terrain following, Low altitude, Flight simulation, Response, Control systems, Man machine systems, Sensitivity, Helicopter rotors, Inertia, Damping, Vertical orientation, Computerized simulation, Aerodynamic characteristics, Helicopters, Quality, Specifications

Subject Categories : Fluid Mechanics
      Jet and Gas Turbine Engines

Distribution Statement : APPROVED FOR PUBLIC RELEASE