Author: Publisher: DIANE Publishing
ISBN: 1428916784
Category :
Languages : en
Pages : 118
Book Description
A Flight-Dynamic Helicopter Mathematical Model with a Single Flap-Lag-Torsion Main Rotor
Author: Publisher: DIANE Publishing
ISBN: 1428916784
Category :
Languages : en
Pages : 118
Book Description
A Flight-Dynamic Helicopter Mathematical Model with a Single Flap-Lag-Torsion Main Rotor
Author: National Aeronautics and Space Administration (NASA)Publisher: Createspace Independent Publishing Platform
ISBN: 9781722897840
Category :
Languages : en
Pages : 118
Book Description
A mathematical model of a helicopter system with a single main rotor that includes rigid, hinge-restrained rotor blades with flap, lag, and torsion degrees of freedom is described. The model allows several hinge sequences and two offsets in the hinges. Quasi-steady Greenberg theory is used to calculate the blade-section aerodynamic forces, and inflow effects are accounted for by using three-state nonlinear dynamic inflow model. The motion of the rigid fuselage is defined by six degrees of freedom, and an optional rotor rpm degree of freedom is available. Empennage surfaces and the tail rotor are modeled, and the effect of main-rotor downwash on these elements is included. Model trim linearization, and time-integration operations are described and can be applied to a subset of the model in the rotating or nonrotating coordinate frame. A preliminary validation of the model is made by comparing its results with those of other analytical and experimental studies. This publication presents the results of research compiled in November 1989. Takahashi, Marc D. Unspecified Center AERODYNAMIC FORCES; DOWNWASH; DYNAMIC MODELS; FLAPPING; HELICOPTERS; MATHEMATICAL MODELS; RIGID ROTORS; TORSION; DEGREES OF FREEDOM; FUSELAGES; HINGES; LINEARIZATION; NONLINEARITY; ROTATION; TAIL ASSEMBLIES; TAIL ROTORS...
A Flight-dynamic Helicopter Mathematical Model with a Single Flap-lag-torsion Main Rotor
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 120
Book Description
A mathematical model of a helicopter system with a single main rotor that includes rigid, hinge-restrained rotor blades with flap, lag, and torsion degrees of freedom is described. The model allows several hinge sequences and two offsets in the hinges. Quasi-steady Greenberg theory is used to calculate the blade-section aerodynamic forces, and inflow effects are accounted for by using a three-state nonlinear dynamic inflow model. The motion of the rigid fuselage is defined by six degrees of freedom, and an optional rotor rpm degree of freedom is available. Empennage surfaces and the tail rotor are modeled, and the effect of main-rotor downwash on these elements is included. Model trim, linearization, and time-integration operations are described and can be applied to a subset of the model in the rotating and nonrotating coordinate frame. A preliminary validation of the model is made by comparing its results with those of other analytical and experimental studies. This publication presents the results of research completed in November 1989.
Aeronautical Engineering
Author: Rotorcraft Aeromechanics
Author: Wayne JohnsonPublisher: Cambridge University Press
ISBN: 1107355281
Category : Technology & Engineering
Languages : en
Pages : 949
Book Description
A rotorcraft is a class of aircraft that uses large-diameter rotating wings to accomplish efficient vertical take-off and landing. The class encompasses helicopters of numerous configurations (single main rotor and tail rotor, tandem rotors, coaxial rotors), tilting proprotor aircraft, compound helicopters, and many other innovative configuration concepts. Aeromechanics covers much of what the rotorcraft engineer needs: performance, loads, vibration, stability, flight dynamics, and noise. These topics include many of the key performance attributes and the often-encountered problems in rotorcraft designs. This comprehensive book presents, in depth, what engineers need to know about modelling rotorcraft aeromechanics. The focus is on analysis, and calculated results are presented to illustrate analysis characteristics and rotor behaviour. The first third of the book is an introduction to rotorcraft aerodynamics, blade motion, and performance. The remainder of the book covers advanced topics in rotary wing aerodynamics and dynamics.
Scientific and Technical Aerospace Reports
Author: An Exploratory Investigation of the Flight Dynamics Effects of Rotor Rpm Variations and Rotor State Feedback in Hover
Author: Journal of the American Helicopter Society
Author: American Helicopter SocietyPublisher:
ISBN:
Category : Helicopters
Languages : en
Pages : 324
Book Description
Author: 
Author: Greg Schulein