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  • AIRCRAFT PROPULSION AND POWER  (5)
  • 1
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    Effects of friction dampers on aerodynamically unstable rotor stages (1985)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA Journal (ISSN 0001-1452); 23; 262-270
    Format: text
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  • 2
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    Effects of friction dampers on aerodynamically unstable rotor stages (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: Attention is given to the physical concepts and mathematical techniques useful in the analysis of the stabilizing effect of friction on aerodynamically unstable rotor stages. Results are presented for three-, four-, and five-bladed disks. In the present multidegree-of-freedom model of an aerodynamically unstable rotor stage, a harmonic steady state solution due to the friction dampers may be either a stability limit, a stable cycle limit, or neither. A criterion is established in the form of an energy function which determines whether the solution is a stability limit. In the event that the initial displacement and velocity exeed those associated with the steady state solution corresponding to a stability limit, the reponse becomes unbounded.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: AIAA PAPER 83-0848
    Format: text
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  • 3
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    Friction damping of flutter in gas turbine engine airfoils (1983)
    In:  Other Sources
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    Publication Date: 2019-06-28
    Description: This paper investigates the feasibility of using blade-to-ground friction dampers to stabilize flutter in blades. The response of an equivalent one mode model in which the aerodynamic force is represented as negative viscous damping is examined to investigate the following issues: the range of amplitudes over which friction damping can stabilize the response, the maximum negative aerodynamic damping that can be stabilized in such a manner, the effect of simultaneous resonant excitation on these stability limits, and the determination of those damper parameters which will be the best for flutter control.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Aircraft; 20; Apr. 198
    Format: text
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  • 4
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    Stability of limit cycles in frictionally damped and aerodynamically unstable rotor stages (1985)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: This paper deals with the stability of limit cycles (Steady-State Oscillations) associated with the multi-degree-of-freedom model of a frictionally damped and aerodynamically unstable rotor stage. By using the first order averaging technique, a generalized criterion has been established to sort out those unstable limit cycles which govern the maximum transient amplitude beyond which the rotor stage becomes unstable.The stability of the remaining steady-state solutions is analyzed by linearizing the averaged system of differential equations. Numerical results are discussed for three-, four- and five-bladed disks.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: Journal of Sound and Vibration (ISSN 0022-460X); 103; 341-356
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  • 5
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    Influence of friction dampers on torsional blade flutter (1986)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: This paper deals with the stabilizing effects of dry friction on torsional blade flutter. A lumped parameter model with single degree of freedom per blade has been used to represent the rotor stage. The well-known cascade theories for incompressible and supersonic flows have been used to determine the allowable increase in fluid velocity relative to the blade. It has been found that the effectiveness of friction dampers in controlling flutter can be substantial.
    Keywords: AIRCRAFT PROPULSION AND POWER
    Type: ASME PAPER 85-GT-170 , ASME, Transactions, Journal of Engineering for Gas Turbines and Power (ISSN 0022-0825); 108; 313-318
    Format: text
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