Accession Number : ADA186944

Title :   Hovering Helicopter Flight Dynamics- A Study of Vertical Motion.

Descriptive Note : Aerodynamics technical memo.,

Corporate Author : AERONAUTICAL RESEARCH LABS MELBOURNE (AUSTRALIA)

Personal Author(s) : Guy, C R

PDF Url : ADA186944

Report Date : 20 Feb 1987

Pagination or Media Count : 49

Abstract : This document examines the flight dynamic characteristics of a hovering helicopter in response to collective stick inputs. Only vertical motion is considered. A mathematical model of the aerodynamics/kinematics and rotor system dynamics of a representative aircraft, linearized about the hovering flight condition, is used as a basis for the study. The dynamic behaviour of this model is compared with flight test results for similar inputs and the coefficients are adjusted to improve model performance. The model structure is then modified by the incorporation of additional terms to improve its accuracy. Although no attempt is made to optimize the coefficients of the model using parameter identification techniques, the approach used here provides acceptable results.

Descriptors :   *HOVERING, ACCURACY, AERODYNAMIC CHARACTERISTICS, AERODYNAMICS, COEFFICIENTS, DYNAMICS, FLIGHT, FLIGHT TESTING, HELICOPTERS, IDENTIFICATION, KINEMATICS, MATHEMATICAL MODELS, MOTION, HELICOPTER ROTORS, VERTICAL ORIENTATION, AUSTRALIA

Subject Categories : Military Aircraft Operations
      Helicopters
      Aerodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE