Design and experimental testing of an induced-shear piezoelectric actuator for rotor blade trailing edge flaps

Centolanza, Louis; Smith, Edward C.

doi:10.2514/6.2000-1713

Cited by 10 publications

(6 citation statements)

References 10 publications

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“…Centolanza and Smith (2000) designed and built the prototype system for the active control of a trailing edge flap in a helicopter rotor blade based on the torsional actuator from Figure 1(a). Overall performance of the prototype was better than that of the design based on the piezoelectric bimorph (Koratkar and Chopra, 1998), because the response of the tubular actuator is constant with external torque load, at least in the range of the torque encountered in such application (Centolanza and Smith, 2000), and because the amplification of the displacement can be controlled without changing the blocking torque. It was also indicated that the compact assembly of the actuator fits the geometry of the rotor blade, which makes it a promising candidate for the active control of trailing edge flaps.…”

Section: Effect Of External Torque Loadmentioning

confidence: 99%

“…Such a reduction of the blocking force can strongly affect the actuator performance during operation under high load. For example, this problem is encountered in applications of PZT bimorphs in helicopters to control the deflection of trailing edge flaps (Koratkar and Chopra, 1998;Centolanza and Smith, 2000) which are subjected to high aerodynamic loads.…”

Section: Introductionmentioning

confidence: 99%

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Torsional Actuator and Stepper Motor Based on Piezoelectric d15 Shear Response

Glazounov

Zhang

Kim

2000

Journal of Intelligent Material Systems and Structures

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Two novel devices, torsional actuator and torsional stepper motor, are described and their performance is investigated in detail. Both devices were designed to produce large angular displacement and large torque output from the piezoelectric d15 shear response. In the torsional actuator, the large displacement can be achieved due to built-in amplification of piezoelectric strain using the aspect ratio of a piezoelectric tube. It is shown that the displacement can be controlled by changing the length of the tube, and that the blocking torque developed is independent of the length. It is also shown that the performance of the actuator does not change under external torque load, and that the prestress in radial direction improves the mechanical strength of the actuator without affecting the produced displacement. In the stepper motor, the unlimited angular displacement of the rotor is produced by accumulating the piezoelectric strain by using a direct coupling mechanism between the stator and the rotor, where a clutch drives the rotor by locking it. The direct coupling makes it possible to transmit the whole power generated in the piezoelectric tube to the rotor, and thus achieve the high efficiency of the motor. Also, the locking mechanism allows smooth motion either in a continuous or stepwise fashion within a 360° interval with a precise control over angular positioning. In addition, the advantage of both devices is their simplicity and a possibility to produce them in the compact package.

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Section: Effect Of External Torque Loadmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Torsional Actuator and Stepper Motor Based on Piezoelectric d15 Shear Response

Glazounov

Zhang

Kim

2000

Journal of Intelligent Material Systems and Structures

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“…The design and use of a piezoelectric torsional actuator is reported by Centolanza and Smith (2000) and Kim et al (1998) and the use of C-block actuator is presented by Clement et al (1999). Particular interest was given to bimorph actuators due to the simple amplification of displacement output that they provide.…”

Section: Introductionmentioning

confidence: 99%

“…Other actuator configurations have also been considered. The design and use of a piezoelectric torsional actuator is reported by Centolanza and Smith (2000) and Kim et al (1998) and the use of C-block actuator is presented by Clement et al (1999).…”

Section: Introductionmentioning

confidence: 99%

Modeling and Analysis of Active Flap Using Coiled Bender Piezoelectric Actuators

Vasilescu

Dancila

2004

Journal of Intelligent Material Systems and Structures

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The applicability and effectiveness of three novel piezoelectric coiled bender actuators to deflect a plain trailing edge flap on a straight wing in the presence of incompressible flow airloads is investigated in this paper through analytical modeling. This work builds upon previous research in which the three actuator configurations, the linear spiral type, the helicoidal type, and the hybrid type, have been proposed and analytically modeled, and the first two configurations have been experimentally validated. A simple analytical model for the piezoelectrically actuated flap is developed and used for this investigation. Results show that the use of coiled piezoelectric actuators for flap deflection is an effective approach. The variation of flap deflection angles with applied actuation voltage and wing angle of attack is also shown, together with performance envelopes.

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“…This approach uses a small flap on each blade to generate controlled aerodynamic loads for vibration reduction. The location and size o f the flaps can be chosen optimally to increase the efficiency of the flap system while the past, the use of novel smart materials actuators such as piezoelectric actuators [37,38,39] and magnetostrictive actuators [40,41,42] have enhanced the practicality o f the ACF approach for helicopter application. The vibration suppression performance o f the ACF for helicopter application has been demonstrated in wind tunnel tests [43,44] and a blade integrated with an ACF was flown by Eurocopter recently [45].…”

Section: Hhc Actuatorsmentioning

confidence: 99%

Dynamics control approaches to improve vibratory environment of the helicopter aircrew

Wickramasinghe¹

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Design and experimental testing of an induced-shear piezoelectric actuator for rotor blade trailing edge flaps

Cited by 10 publications

References 10 publications

Torsional Actuator and Stepper Motor Based on Piezoelectric d15 Shear Response

Torsional Actuator and Stepper Motor Based on Piezoelectric d15 Shear Response

Modeling and Analysis of Active Flap Using Coiled Bender Piezoelectric Actuators

Dynamics control approaches to improve vibratory environment of the helicopter aircrew

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