&lt;title&gt;Application-specific design of adaptive structures with piezoceramic patch actuators&lt;/title&gt;

Wierach, Peter; Monner, Hans Peter; Schoenecker, Andreas; Duerr, Johannes K.

doi:10.1117/12.475080

Cited by 12 publications

(10 citation statements)

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“…In comparison with equation (6) it follows, that the integral can also be written as q T f p , which also holds in case of an anisotropic material law. With (5) a compact form of the pure actuator and sensor equations is given by…”

Section: The Generalized Electro-mechanical Coupling Coefficientmentioning

confidence: 93%

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Modal Based Correction Methods for the Placement of Piezoceramic Modules

Rose

2005

Aerospace

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Conventional Finite-Element programs are able to compute the vibration response of mechanical structures. Increasingly also so-called multi-field problems can be solved. For piezoelectric actuators and sensors, electrical degrees of freedom apart from the mechanical ones have to be considered too. The pure actuator effect can also be modelled using the coefficients of thermal expansion. But regarding the optimal placement of flat piezoceramic modules, which couple in the mechanical part through the d31-effect, it proves to be advantageous to consider them after doing the computational complex modal analysis. In this paper, this modal coupling approach is described in detail. It introduces an additional modelling error, because the effect of the stiffness and mass of the modules is not considered in the construction process of the functional space, from which modal shapes are derived. But due to the comparatively small contribution to the global mass and stiffness of such flat devices, this additional error can generally be accepted. Furthermore this error can be reduced to an arbitrarily small amount, if the number of retained eigenmodes is increased and the gain in computational speed is significant. For the calculations, self-written triangle elements with full electro-mechanical coupling have been used, being coded completely in MATLAB. Finally the optimization procedure for the placement of the piezoceramic modules including their mass and stiffness is demonstrated for a test structure.

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Section: The Generalized Electro-mechanical Coupling Coefficientmentioning

confidence: 93%

“…Anisotropic material laws are not considered in the MATLABimplementation, because the classic d 31 -patches have been of main interest to our department so far [6]. The implementation can easily be extended to the anisotropic case though.…”

Section: An Electro-active Triangular Bending Elementmentioning

confidence: 99%

Modal Based Correction Methods for the Placement of Piezoceramic Modules

Rose

2005

Aerospace

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“…An appropriate solution for this problem is the use of so called 'piezo composites' (13) . Piezo composites are a combination of piezoceramic materials and ductile polymers, which form a robust and easy to use actuator and/or sensor.…”

Section: Actuation Technologymentioning

confidence: 99%

Experimental investigation of an active twist model rotor blade with a low voltage actuation system

Wierach¹,

Opitz²,

Kalow³

2015

Aeronaut.j.

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Smart materials that are directly embedded in the rotor blade structure are an attractive concept for active blade control. A promising approach is the use of anisotropic piezoelectric strain actuators embedded in the rotor blade skin. Especially in Europe and the US this concept has been intensively investigated over the past years. A major drawback of all configurations studied so far is the high operation voltage of up to 2,000V of state of the art piezoelectric actuators. Within the Green Rotorcraft Project of the European Joint Technology Initiative Clean Sky, a new approach with a low voltage piezoelectric actuation system is investigated to demonstrate the feasibility of this technology.A first major step in this direction was completed by conducting a centrifugal test with a model rotor blade. The objective of the centrifugal test was to demonstrate the performance of the actuation system and the structural concept under centrifugal loads by showing that the expected twist deformation can be achieved at the nominal rotation speed and different actuation frequencies.It was demonstrated that the new actuation system is capable of operating under representative centrifugal loads. In comparison to state-of-the-art actuators (operation voltage 500V to +1500V) the new actuation system (operation voltage −20V to 120V) exhibits higher active twist performance per active area.

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“…The sensors with embedded piezoceramic foils and fibres of the PZT (lead-zirconate-titanate) system were developed and realized by DLR in Braunschweig and by Fraunhofer IFAM in Bremen [Ges00,Ges02], respectively. The manufacture of the PZT-foil sensors is described in more detail in an accompanying article of this issue [Wie03].…”

Section: Piezoceramic Patch Sensorsmentioning

confidence: 99%