ON INFLUENCE OF KINEMATICS TO EQUIVALENT LINEAR DAMPING OF HELICOPTER BLADE HYDRAULIC DAMPER
An analytical model of hydraulic damper was presented in forward flight accounting for pitch/flap/lag kinematic coupling and its nonlinear force-velocity curve. The fourth order Runge-Kutta was applied to calculate the damper axial velocity in time domain. Fourier series based moving block analysis...
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| Published in | Applied mathematics and mechanics Vol. 23; no. 8; pp. 922 - 930 |
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| Main Author | |
| Format | Journal Article |
| Language | English |
| Published |
Institute of Aircraft Design and Research, Beijing University of,Aeronautics and Astronautics, Beijing 100083, P R China
01.08.2002
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| Subjects | |
| Online Access | Get full text |
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| Abstract | An analytical model of hydraulic damper was presented in forward flight accounting for pitch/flap/lag kinematic coupling and its nonlinear force-velocity curve. The fourth order Runge-Kutta was applied to calculate the damper axial velocity in time domain. Fourier series based moving block analysis was applied to calculate equivalent linear damping in terms of transient responses of damper axial velocity. Results indicate that equivalent linear damping will be significantly reduced if pitch/ flap/ lag kinematic coupling introduced for notional model and flight conditions. |
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| AbstractList | An analytical model of hydraulic damper was presented in forward flight accounting for pitch/flap/lag kinematic coupling and its nonlinear force-velocity curve. The fourth order Runge-Kutta was applied to calculate the damper axial velocity in time domain. Fourier series based moving block analysis was applied to calculate equivalent linear damping in terms of transient responses of damper axial velocity. Results indicate that equivalent linear damping will be significantly reduced if pitch/ flap/ lag kinematic coupling introduced for notional model and flight conditions. V275.1%O322.11; An analytical model of hydraulic damper was presented in forward flight accounting for pitch/flap/lag kinematic coupling and its nonlinear force-velocity curve. The fourth order Runge-Kutta was applied to calculate the damper axial velocity in time domain. Fourier series based moving block analysis was applied to calculate equivalent linear damping in terms of transient responses of damper axial velocity. Results indicate that equivalent linear damping will be significantly reduced if pitch/ flap/ lag kinematic coupling introduced for notional model and flight conditions. |
| Author | HU Guo-cai(胡国才) XIANG Jin-wu(向锦武) ZHANG Xiao-gu(张晓谷) |
| AuthorAffiliation | Institute of Aircraft Design and Research, Beijing University of,Aeronautics and Astronautics, Beijing 100083, P R China Institute of Aircraft Design and Research, Beijing University of,Aeronautics and Astronautics, Beijing 100083, P R China Institute of Aircraft Design and Research, Beijing University of,Aeronautics and Astronautics, Beijing 100083, P R China |
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| Cites_doi | 10.2514/6.1981-653 10.2514/6.1995-1449 10.4050/JAHS.35.39 10.21236/ADA057932 |
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| Keywords | equivalent linear damping hydraulic damper nonlinear damping kinematic coupling helicopter rotor blade |
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| References | BF02437797_CR1 J M Wang (BF02437797_CR4) 1998 C B Smith (BF02437797_CR8) 1998 BF02437797_CR6 W Johnson (BF02437797_CR5) 1991 F A Tasker (BF02437797_CR7) 1990; 35 C Niebanck (BF02437797_CR2) 1978 BF02437797_CR3 |
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| Snippet | An analytical model of hydraulic damper was presented in forward flight accounting for pitch/flap/lag kinematic coupling and its nonlinear force-velocity... V275.1%O322.11; An analytical model of hydraulic damper was presented in forward flight accounting for pitch/flap/lag kinematic coupling and its nonlinear... |
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| SubjectTerms | blade coupling damper damping equivalent helicopter hydraulic kinematic linear nonlinear rotor |
| Title | ON INFLUENCE OF KINEMATICS TO EQUIVALENT LINEAR DAMPING OF HELICOPTER BLADE HYDRAULIC DAMPER |
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