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Stability Analysis of Helicopter Rotor Flapping

Author: MaYuJie
Tutor: CaoDengQing
School: Harbin Institute of Technology
Course: General and Fundamental Mechanics
Keywords: Paddle Waving parameters Duffing equation Melnikov method Dynamic balance
CLC: V224
Type: Master's thesis
Year: 2010
Downloads: 79
Quote: 0
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Abstract


The blades are important parts of the helicopter rotor lift system , the stability of the dynamic characteristics directly affect the flying qualities of the helicopter . Dynamic balance test process parameter measurement based on the dynamic characteristics of the blade , the establishment of the blades with complex aerodynamic Excitation of Duffing nonlinear waving motion equation , through the Melnikov method to analyze the stability of flapping parameters and environmental parameters sensitive and simulation and test verification. First, the establishment of the flapping motion model corner waving Taylor series expansion , with three times the nonlinear terms deduced the cycle slip variable damping and complex periodic excitation Duffing equation . Lyapunov stability theory to study the stability of the flapping motion ; the Melnikov method derived the unstable vibration caused by environmental gusts rotor blades threshold . Using Melnikov method analysis the flapping motion process pneumatic stiffness , aerodynamic damping , twice the cycle unbalanced aerodynamic Excitation role on the stability of the system , to study the sensitivity of the the flapping stability and environmental parameters . Matlab simulation program and on-site dynamic balance test results of the theoretical analysis , the flapping motion of Duffing waving motion model is reasonable , and also to determine the environmental conditions of the paddle characteristic parameter calibration process for the paddle calibration laid the foundation .

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CLC: > Aviation, aerospace > Aviation > Aircraft Construction and Design > Airfoil
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