Measurement of twist deflection in active twist rotor

Riemenschneider, Johannes; Opitz, Steffen

doi:10.1016/j.ast.2010.12.008

Cited by 11 publications

(4 citation statements)

References 3 publications

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“…All three techniques were found to derive performance enhancements, with the development of active twist, in particular, advanced due to the development of piezoelectric technology [38]. In addition to the specific blade design, optimisation of the airframe itself may result in aeroacoustic reductions.…”

Section: Synchrophasing Analysismentioning

confidence: 99%

A computational fluid dynamic acoustic investigation of a tiltwing eVTOL concept aircraft

Higgins

Barakos

Shahpar

et al. 2021

Aerospace Science and Technology

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Section: Synchrophasing Analysismentioning

confidence: 99%

A computational fluid dynamic acoustic investigation of a tiltwing eVTOL concept aircraft

Higgins

Barakos

Shahpar

et al. 2021

Aerospace Science and Technology

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“…The review articles by Crawley [163], Loewy [164], Chopra [13,165], Giurgiutiu [166], and Thakkar and Ganguli [167] covered the research conducted in this area. The latest contribution in the area of active blade twisting is the research carried out by the German Aerospace Center (DLR) [168][169][170][171]. The DLR concept of causing twist in the blades, was the induction of shear, with surface bonded piezoelectric actuators.…”

Section: Piezoelectric Active Control Of the Rotor System Of Helicoptersmentioning

confidence: 99%

Review on the use of piezoelectric materials for active vibration, noise, and flow control

Shivashankar

Gopalakrishnan

2020

Smart Mater. Struct.

146

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Considering the number of applications, and the quantity of research conducted over the past few decades, it would not be an overstatement to label the piezoelectric materials as the cream of the crop of the smart materials. Among the various smart materials, the piezoelectric materials have emerged as the most researched material for practical applications. They owe it to a few key factors like low cost, large frequency bandwidth of operation, availability in many forms, and the simplicity offered in handling and implementation. For piezoelectric materials, from an application standpoint, the area of active control of vibration, noise, and flow, stands, alongside energy harvesting, as the most researched field. Over the past three decades, several authors have used piezoelectric materials as sensors and actuators, to (i) actively control structural vibrations, noise and aeroelastic flutter, (ii) actively reduce buffeting, and (iii) regulate the separation of flows. These studies are spread over several engineering disciplines-starting from large space structures, to civil structures, to helicopters and airplanes, to computer hard disk drives. This review is an attempt to concise the progress made in all these fields by exclusively highlighting the application of the piezoelectric material. The research carried out in the past five years, in the areas of modeling, and optimal positioning of piezoelectric actuators/sensors, for active vibration control (AVC), are covered. Along with this, investigations into different control algorithms, for the piezoelectric based AVC, are also reviewed. Studies reporting the use of piezoelectric modal filtering and self sensing actuators, for AVC, are also surveyed. Additionally, research on semi-AVC techniques like the synchronized switched damping (on elements like resistor, inductor, voltage source, negative capacitor) has also been covered.

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“…This is partly due to difficulties with the required mechanism for the twist change and the manufacturing of this new breed of rotor blades. In recent years, piezoelectric materials have been used to actuate the blade twist [6,7], like active fiber composites (AFC) [8][9][10] and macro fiber composites (MFC) [11][12][13]. Smart materials and structures have demonstrated their potential in actuating blade twist and controlling rotor vibration loads, as well as, improving helicopter rotor performance.…”

Section: Introductionmentioning

confidence: 99%

Helicopter flight performance improvement by dynamic blade twist

Han

Pastrikakis

Barakos

2016

Aerospace Science and Technology

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Dynamic blade twist is investigated as a method for reducing rotor power and improving helicopter performance. An analytical model able to predict helicopter rotor power is first presented, and the flight data of the UH-60A helicopter and the Helicopter Multi-Block Method (HMB2) are used for validation. The predictions of the rotor power are in good agreement with the flight test data and HMB2, which verifies the application of the present method in analyzing helicopter performance. In hover and low speed forward flight, the power reduction by the prescribed dynamic blade twist is substantially small. In high speed forward flight, the effect of dynamic blade twist becomes more pronounced. It is found that lower harmonic blade twist can achieve larger power savings than higher harmonic twist. The zero harmonic twist dominates the power reductions. The helicopter takeoff weight was found to have a strong influence on the power reductions achieved by the prescribed dynamic blade twist.

show abstract

Measurement of twist deflection in active twist rotor

Cited by 11 publications

References 3 publications

A computational fluid dynamic acoustic investigation of a tiltwing eVTOL concept aircraft

A computational fluid dynamic acoustic investigation of a tiltwing eVTOL concept aircraft

Review on the use of piezoelectric materials for active vibration, noise, and flow control

Helicopter flight performance improvement by dynamic blade twist

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