Aeroelastic analysis of rotor systems using trailing edge flaps

Lim, In-Gyu; Lee, In

doi:10.1016/j.jsv.2008.10.029

Cited by 12 publications

(11 citation statements)

References 15 publications

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“…The most advanced approaches so far are the direct twist concept (Straub et al, 2004) and active trailing edge (ATE) flaps (Maucher et al, 2007), where induced dynamic pressure load variations generate bending and especially torsion deformations. The structure-fluidrotor interactions require intense investigation of the aeroelastic behavior (Lim and Lee, 2009). A helicopter equipped with trailing edge flaps was first flight tested by Eurocopter in 2005 on a BK117 helicopter (Roth et al, 2007), confirming the expected aerodynamic improvements including those in reduced noise and vibration levels.…”

Section: Dynamic Deformation Control Of Helicopter Rotorsmentioning

confidence: 96%

Active and Morphing Aerospace Structures-A Synthesis between Advanced Materials, Structures and Mechanisms

Baier¹,

Datashvili²

2011

International Journal of Aeronautical and Space Sciences

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Active and shape morphing aerospace structures are discussed with a focus on activities aimed at practical implementation. In active structures applications range from dynamic load alleviation in aircraft and spacecraft up to static and dynamic shape control. In contrast, shape morphing means strong shape variation according to different mission status and needs, aiming to enhance functionality and performance over wide flight and mission regimes. The interaction of required flexible materials with the morphing structure and the actuating mechanisms is specifically addressed together with approaches in design and simulation.

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Section: Dynamic Deformation Control Of Helicopter Rotorsmentioning

confidence: 96%

Active and Morphing Aerospace Structures-A Synthesis between Advanced Materials, Structures and Mechanisms

Baier¹,

Datashvili²

2011

International Journal of Aeronautical and Space Sciences

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“…It is a well‐known fact that the increasing aspect ratio of aerodynamic surfaces such as aircraft wings and rotor blades results in greater loads and structure flexibility. Employing active controls in order to ensure stability, limiting stress peaks and reducing the fatigue experienced by wind turbine blades, has therefore gained significant research interest over the last decade . Spanwise and local flow controls have been proposed for controlling the vibrations of aeroelastic structures .…”

Section: Introductionmentioning

confidence: 99%

“…Employing active controls in order to ensure stability, limiting stress peaks and reducing the fatigue experienced by wind turbine blades, has therefore gained significant research interest over the last decade. [1][2][3] Spanwise and local flow controls have been proposed for controlling the vibrations of aeroelastic structures. [4][5][6] Spanwise controls are generally very effective but require substantial actuation energy and rapid dynamics that may wear excessively on actuators.…”

Section: Introductionmentioning

confidence: 99%

A decoupling control strategy for wind turbine blades equipped with active flow controllers

2016

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The use of active controls has shown to be of substantial help in supporting the increasing size of wind turbines by reducing peak stresses and fatigue loads. In this respect, this paper proposes the use of intuitive frequency-based control strategies for reducing loads in wind turbine blades equipped with multi-input multi-output (MIMO) active flow controllers. For that purpose, a loop-shaping approach is considered for analysing the dynamic of actively controlled wind turbine blades. Preliminary aeroelastic simulations are carried out to validate the results. It is shown that the MIMO vibration control problem can effectively be decomposed into a number of decoupled single-input single-output control problems because of the strong correlation between the dominant aeroelastic blade dynamics and actuator deployments. As a result, it is demonstrated that classical single-input single-output control systems can perform as efficiently as MIMO controllers for damping the aeroelastic dynamics of wind turbine blades.

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“…In the last two decades, various active approaches were tested numerically (Milgram, Chopra, and Straub, 1998;Cesnik et al, 2004;Lim and Lee, 2009) and experimentally (Noboru et al, 2007;Konstanzer et al, 2008;Sinapius et al, 2014). Piezo actuated active control flap (ACF) methods have emerged as the best potential candidates to alleviate helicopter vibration (Konstanzer et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Robust design of multiple trailing edge flaps for helicopter vibration reduction: A multi-objective bat algorithm approach

Mallick

Ganguli

Bhat

2014

Engineering Optimization

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The objective of this study is to determine an optimal trailing edge flap configuration and flap location to achieve minimum hub vibration levels and flap actuation power simultaneously. An aeroelastic analysis of a soft in-plane four-bladed rotor is performed in conjunction with optimal control. A second-order polynomial response surface based on an orthogonal array (OA) with 3-level design describes both the objectives adequately. Two new orthogonal arrays called MGB2P-OA and MGB4P-OA are proposed to generate nonlinear response surfaces with all interaction terms for two and four parameters, respectively. A multi-objective bat algorithm (MOBA) approach is used to obtain the optimal design point for the mutually conflicting objectives. MOBA is a recently developed nature-inspired metaheuristic optimization algorithm that is based on the echolocation behaviour of bats. It is found that MOBA inspired Pareto optimal trailing edge flap design reduces vibration levels by 73% and flap actuation power by 27% in comparison with the baseline design.

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Aeroelastic analysis of rotor systems using trailing edge flaps

Cited by 12 publications

References 15 publications

Active and Morphing Aerospace Structures-A Synthesis between Advanced Materials, Structures and Mechanisms

Active and Morphing Aerospace Structures-A Synthesis between Advanced Materials, Structures and Mechanisms

A decoupling control strategy for wind turbine blades equipped with active flow controllers

Robust design of multiple trailing edge flaps for helicopter vibration reduction: A multi-objective bat algorithm approach

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