Nonlinear Flexible Multibody Dynamic Analysis of Rotor Blades with a Trailing Edge Flap

2006 ◽  
Author(s):  
Manabendra Das ◽  
Atila Barut ◽  
Erdogan Madenci ◽  
Friedrich Straub
Keyword(s):  
Dynamic Analysis ◽  
Rotor Blades ◽  
Trailing Edge ◽  
Multibody Dynamic ◽  
Flexible Multibody ◽  
Trailing Edge Flap

scholarly journals A comparative assessment of vibration control capabilities of a L-shaped Gurney flap

2016 ◽  
Vol 120 (1233) ◽  
pp. 1812-1831 ◽  
Author(s):  
V. Motta ◽  
G. Quaranta
Keyword(s):  
Vibration Reduction ◽  
Rotor Blades ◽  
Vertical Force ◽  
Trailing Edge ◽  
Helicopter Blade ◽  
Reduced Frequency ◽  
Gurney Flap ◽  
Alternative Means ◽  
Higher Harmonic Control ◽  
Trailing Edge Flap

ABSTRACTThis work presents the capabilities of a novel L-shaped trailing-edge Gurney flap as a device for vibration reduction. The primary effect of this L-tab is represented by a modification of the reference aerofoil mean line shape through by two counter-rotating vortical structures created at the trailing edge. The comparison of the aerodynamic loads generated by the novel L-tab Gurney flap and a classical trailing-edge flap allows to estimate the ranges of reduced frequency where the L-tab is expected to perform better than a trailing edge flap and vice versa. Linear aerostructural models for a typical section representative of a helicopter blade equipped with a partial-span L-tab or a trailing-edge flap are built, and a higher harmonic control algorithm is applied. Performance are compared between the two devices to reduce separately the N/rev harmonics of the blade root rotating frame vertical force, flapping and feathering moments. The attainment of similar results with classical trailing-edge device is a further confirmation of the potential feasibility of this novel L-tab as an effective alternative means for vibration reduction on rotor blades.

Flexible Multibody Dynamic Analysis of the Deployable Composite Reflector Antenna

2019 ◽  
Vol 47 (10) ◽  
pp. 705-711
Author(s):  
Yoon-Ji Lim ◽  
Young-Eun Oh ◽  
Jin-Ho Roh ◽  
Soo-Yong Lee ◽  
Hwa-Young Jung ◽  
...  
Keyword(s):  
Dynamic Analysis ◽  
Reflector Antenna ◽  
Multibody Dynamic ◽  
Flexible Multibody

Development of a piezoelectric actuator for trailing-edge flap control of rotor blades

1999 ◽  
Author(s):  
Friedrich K. Straub ◽  
Hieu T. Ngo ◽  
V. Anand ◽  
David B. Domzalski
Keyword(s):  
Piezoelectric Actuator ◽  
Rotor Blades ◽  
Trailing Edge ◽  
Trailing Edge Flap

An Accurate Singularity-Free Formulation of a Three-Dimensional Curved Euler-Bernoulli Beam for Flexible Multibody Dynamic Analysis

2016 ◽  
Author(s):  
W. Fan ◽  
W. D. Zhu
Keyword(s):  
Dynamic Analysis ◽  
Three Dimensional ◽  
Differential Algebraic Equations ◽  
Bernoulli Beam ◽  
Euler Parameters ◽  
Generalized Coordinates ◽  
Current Formulation ◽  
Multibody Dynamic ◽  
Flexible Multibody ◽  
Euler Bernoulli Beam

An accurate singularity-free formulation of a three-dimensional curved Euler-Bernoulli beam with large deformations and large rotations is developed for flexible multibody dynamic analysis. Euler parameters are used to characterize orientations of cross-sections of the beam, which can resolve the singularity problem caused by Euler angles. The position of the centroid line of the beam is integrated from its slope, and position vectors of nodes of beam elements are no longer used as generalized coordinates. Hence, the number of generalized coordinates for each node is minimized. Euler parameters instead of position vectors are interpolated in the current formulation, and a new C1-continuous interpolation function is developed, which can greatly reduce the number of elements. Governing equations of the beam and constraint equations are derived using Lagrange’s equations for systems with constraints, which are solved by the generalized-α method for resulting differential-algebraic equations. The current formulation can be used to calculate static and dynamic problems of straight and curved Euler-Bernoulli beams under arbitrary concentrated and distributed forces. The stiffness matrix and generalized force in the current formulation are much simpler than those in the geometrically exact beam formulation (GEBF) and absolute node coordinate formulation (ANCF), which makes it more suitable for static equilibrium problems. Numerical simulations show that the current formulation can achieve the same accuracy as the GEBF and ANCF with much fewer elements and generalized coordinates.

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