Aeroelastic Response of Rotorcraft

In this chapter we will examine a number of aeroelastic phenomena associated with helicopters and other rotor or propeller driven aircraft. Certain areas have been selected for treatment to illustrate some significant stability problems which are associated with the design of helicopters. The approach to be followed employs simplified modelling of various problems such that physical insight into the nature of the phenomena can be obtained. In general a complete and precise formulation of many of the problem areas discussed is highly complex and the reader is referred to the literature for these more detailed formulations.

[1]  Troy M. Gaffey,et al.  The Effect of Positive Pitch-flap Coupling (Negative δ 3 ) on Rotor Blade Motion Stability and Flapping , 1969 .

[2]  R. Loewy A Two-Dimensional Approximation to the Unsteady Aerodynamics of Rotary Wings , 1957 .

[3]  Alfred Gessow,et al.  Aerodynamics of the Helicopter , 1981 .

[4]  M. I. Young A Simplified Theory of Hingeless Rotors with Application to Tandem Helicopters , 1962 .

[5]  David A. Peters,et al.  Finite-State Induced-Flow Model for Rotors in Hover and Forward Flight , 1989 .

[6]  D. K. Berrington Design and Development of the Westland Sea Lynx , 1974 .

[7]  R. H. Miller,et al.  Rotor blade harmonic air loading , 1964 .

[8]  Norman D. Ham,et al.  Dynamic Stall Considerations in Helicopter Rotors , 1968 .

[9]  Robert P. Coleman,et al.  Theory of self-excited mechanical oscillations of helicopter rotors with hinged blades , 1958 .

[10]  W. H. Reed Review of propeller-rotor whirl flutter , 1967 .

[11]  K H Hohenemser Hingeless Rotorcraft Flight Dynamics , 1974 .

[12]  W. Johnson,et al.  Dynamics of tilting proprotor aircraft in cruise flight , 1974 .

[13]  F. X. Caradonna,et al.  An Experimental Analysis of Dynamic Stall on an Oscillating Airfoil , 1974 .

[14]  D. Peters,et al.  Correlation of Measured Induced Velocities with a Finite-State Wake Model , 1991 .

[15]  Norman D Ham,et al.  Helicopter Blade Flutter , 1973 .

[16]  Peretz P. Friedmann,et al.  Recent developments in rotary-wing aeroelasticity , 1977 .

[17]  H. C. Curtiss,et al.  Complex Coordinates in Near Hovering Rotor Dynamics , 1973 .

[18]  L. Goland,et al.  Dynamic Effects in Rotor Blade Bending , 1951 .

[19]  N. D. Ham,et al.  On the mechanism of dynamic stall. , 1972 .

[20]  R. T. Lytwyn,et al.  The Influence of Blade Flapping Restraint on the Dynamic Stability of Low Disk Loading Propeller-Rotors , 1967 .

[21]  Kurt H. Hohenemser,et al.  Some Applications of the Method of Multiblade Coordinates , 1972 .

[22]  David A. Peters,et al.  An approximate closed-form solution for lead lag damping of rotor blades in hover , 1975 .

[23]  Wayne Johnson,et al.  Influence of unsteady aerodynamics on hingeless rotor ground resonance , 1982 .

[24]  Earl H. Dowell,et al.  Nonlinear equations of motion for the elastic bending and torsion of twisted nonuniform rotor blades , 1974 .

[25]  Peretz Friedmann,et al.  Aeroelastic Stability Of Complete Rotors With Application To A Teetering Rotor In Forward Flight , 1976 .

[26]  R. E. Hansford,et al.  Torsion-Flap-Lag Coupling on Helicopter Rotor Blades , 1973 .

[27]  Leonard Goland,et al.  A Comparison of the Calculated and Observed Flutter Characteristics of a Helicopter Rotor Blade , 1957 .

[28]  Dewey H. Hodges,et al.  Linear Flap-Lag Dynamics of Hingeless Helicopter Rotor Blades in Hover , 1972 .

[29]  Anton J. Landgrebe,et al.  An analytical method for predicting rotor wake geometry , 1969 .

[30]  J. G. Leishman,et al.  A Semi-Empirical Model for Dynamic Stall , 1989 .

[31]  R. T. Yntema,et al.  Simplified Procedures and Charts for the Rapid Estimation of Bending Frequencies of Rotating Beams , 1954 .

[32]  David A. Peters,et al.  Hingeless Helicopter Rotor Response with Nonuniform Inflow and Elastic Blade Bending , 1972 .

[33]  D. Peters,et al.  Effectiveness of Current Dynamic-Inflow Models in Hover and Forward Flight , 1986 .

[34]  David A. Peters,et al.  Application of the Floquet Transition Matrix to Problems of Lifting Rotor Stability , 1971 .

[35]  W. J. McCroskey,et al.  Detailed aerodynamic measurements on a model rotor in the blade stall regime , 1971 .

[36]  D. Petot,et al.  Aeroelastic prediction of rotor loads in forward flight , 1987 .

[37]  J. E. Burkam,et al.  Exploration of Aeroelastic Stability Boundaries with a Soft-in-Plane Hingeless-Rotor Model , 1972 .

[38]  Robert G. Loewy,et al.  Review of rotary-wing V/STOL dynamic and aeroelastic problems , 1969 .

[39]  R. A. Ormiston,et al.  A Study of Stall-Induced Flap-Lag Instability of Hingeless Rotors , 1973 .

[40]  Boeing,et al.  Airborne and Ground Resonance of Hingeless Rotors , 1971 .

[41]  L. Ericsson,et al.  Dynamic Stall of Helicopter Blades , 1970 .

[42]  R. E. Donham,et al.  Ground and air resonance characteristics of a soft in-plane rigid-rotor system , 1969 .

[43]  Robert M. Bennett,et al.  AN EXPERIMENTAL INVESTIGATION OF HELICOPTER STABILITY CHARACTERISTICS NEAR HOVERING FLIGHT USING A DYNAMICALLY SIMILAR MODEL , 1960 .

[44]  W. Earl Hall,et al.  Prop‐Rotor Stability at High Advance Ratios , 1966 .

[45]  Paul J Carpenter,et al.  Effect of a Rapid Blade-Pitch Increase on the Thrust and Induced-Velocity Response of a Full-Scale Helicopter Rotor , 1953 .

[46]  Jaan Liiva,et al.  Dynamic Stall Of Airfoil Sections For High-Speed Rotors , 1969 .

[47]  Pei Chi Chou,et al.  Pitch-Lag Instability of Helicopter Rotors , 1958 .

[48]  H. C. Curtiss Sensitivity of Hingeless Rotor Blade Flap-lag Stability in Hover to Analytical Modelling Assumptions , 1975 .

[49]  David A. Peters,et al.  Flap‐Lag Damping in Hover and Forward Flight with a Three‐Dimensional Wake , 1993 .

[50]  Oh Joon Kwon,et al.  Stability of Hingeless Rotors in Hover Using Three-Dimensional Unsteady Aerodynamics , 1991 .

[51]  David A. Peters,et al.  Theoretical prediction of dynamic inflow derivatives , 1980 .

[52]  F. J. Tarzanin,et al.  Prediction of Control Loads Due to Blade Stall , 1972 .

[53]  Norimichi Kawakami,et al.  Dynamics of an elastic seesaw rotor , 1977 .