Helicopter flight dynamics : the theory and application of flying qualities and simulation modelling / Gareth D. Padfield.

Format:

Book

Author/Creator:

Padfield, G. D.

Language:

English

Subjects (All):

Helicopters--Aerodynamics.

Helicopters.

Helicopters--Handling characteristics.

Physical Description:

1 online resource (680 p.)

Edition:

2nd ed.

Place of Publication:

Oxford : Blackwell Publishing ; Washington DC : American Institute of Aeronautics and Astronautics, 2007.

Language Note:

English

Summary:

The behaviour of helicopters is so complex that understanding the physical mechanisms at work in trim, stability and response, and thus the prediction of Flying Qualities, requires a framework of analytical and numerical modelling and simulation. Good Flying Qualities are vital for ensuring that mission performance is achievable with safety and, in the first edition of Helicopter Flight Dynamics, a comprehensive treatment of design criteria was presented. In this second edition, the author complements this with a new Chapter on Degraded Flying Qualities, drawing examples from flight in poor vi

Contents:

HELICOPTER FLIGHT DYNAMICS; Contents; Preface to first edition; Preface to second edition; Copyright acknowledgements; Notation; List of abbreviations; Chapter 1 Introduction; 1.1 Simulation modelling; 1.2 Flying qualities; 1.3 Missing topics; 1.4 Simple guide to the book; Chapter 2 Helicopter flight dynamics - an introductory tour; 2.1 Introduction; 2.2 Four reference points; 2.2.1 The mission and piloting tasks; 2.2.2 The operational environment; 2.2.3 The vehicle configuration, dynamics and flight envelope; Rotor controls; Two distinct flight regimes; Rotor stall boundaries

2.2.4 The pilot and pilot-vehicle interface2.2.5 Resume of the four reference points; 2.3 Modelling helicopter flight dynamics; The problem domain; Multiple interacting subsystems; Trim, stability and response; The flapping rotor in vacuo; The flapping rotor in air - aerodynamic damping; Flapping derivatives; The fundamental 90deg phase shift; Hub moments and rotor/fuselage coupling; Linearization in general; Stability and control resume; The static stability derivative Mw; Rotor thrust, inflow, Zw and vertical gust response in hover; Gust response in forward flight

Vector-differential form of equations of motionValidation; Inverse simulation; Modelling review; 2.4 Flying qualities; Pilot opinion; Quantifying quality objectively; Frequency and amplitude - exposing the natural dimensions; Stability - early surprises compared with aeroplanes; Pilot-in-the-loop control; attacking a manoeuvre; Bandwidth - a parameter for all seasons?; Flying a mission task element; The cliff edge and carefree handling; Agility factor; Pilot's workload; Inceptors and displays; Operational benefits of flying qualities; Flying qualities review; 2.5 Design for flying qualities

stability and control augmentationImpurity of primary response; Strong cross-couplings; Response degradation at flight envelope limits; Poor stability; The rotor as a control filter; Artificial stability; 2.6 Chapter review; Chapter 3 Modelling helicopter flight dynamics: building a simulation model; 3.1 Introduction and scope; 3.2 The formulation of helicopter forces and moments in level 1 modelling; 3.2.1 Main rotor; Blade flapping dynamics - introduction; The centre-spring equivalent rotor; Multi-blade coordinates; Rotor forces and moments; Rotor torque; Rotor inflow

Momentum theory for axial flightMomentum theory in forward flight; Local-differential momentum theory and dynamic inflow; Rotor flapping-further considerations of the centre-spring approximation; Rotor in-plane motion - lead-lag; Rotor blade pitch; Ground effect on inflow and induced power; 3.2.2 The tail rotor; 3.2.3 Fuselage and empennage; The fuselage aerodynamic forces and moments; The empennage aerodynamic forces and moments; 3.2.4 Powerplant and rotor governor; 3.2.5 Flight control system; Pitch and roll control; Yaw control; Heave control

3.3 Integrated equations of motion of the helicopter

Notes:

Description based upon print version of record.

Includes bibliographical references (p. [608]-631) and index.

ISBN:

1-281-31889-2

9786611318895

0-470-69184-0

0-470-69116-6

OCLC:

437218477