... of a lightweight absorbent material of high porosity. Moreover, they are active, so piezoelectric actuators in the form of thin patches are fixed to their faceplates. Therefore, the passive absorbent properties of porous core, effective at high and medium frequencies, can be combined with the active vibroacoustic...

... of a flexible cylindrical panel respectively coupled with the center-placed and corner-placed new actuator systems. Closed-loop actuation to improve control effectiveness of unsymmetrical shell modes is also evaluated. actuators photovoltaic effects piezoelectric actuators piezoelectric materials...

...T. M. Seigler; A. H. Ghasemi The problem considered is that of solving for the control input that generates partly specified motion of a deformable structure with distributed piezoelectric actuation. The motion constraint, called the program constraint, is specified as a desired relation...

... actuators. 18 06 2010 01 02 2011 31 08 2011 20 09 2011 acoustic field acoustic noise acoustic waves aeroacoustics aerospace components aircraft boundary-elements methods noise abatement piezoelectric actuators propellers Interior cabin noise is a challenging...

... ). piezoceramic parametric velocity feedback frequency response open loop systems piezoceramics piezoelectric actuators proportional control vibration control vibrations This section investigates the effect of the thickness of the square piezoceramic patch on the stability and control...

... of the SPIE Seventh Annual International Symposium on Smart Structures and Materials , Newport Beach, CA. High , J. W. and Wilkie , W. K. , “ Method of Fabricating NASA-Standard Macro-Fiber Composite Piezoelectric Actuators ,” NASA Report Nos. TM-2003-212427 and ARL-TR-2833. Hagood...

.... In the proposed method, an array of one or more precharged capacitors is employed to provide a selection of various voltages, which may be selected to approximate a desired control signal defined by an LQR multimodal vibration controller. The capacitors can apply a control voltage to the piezoelectric actuators...

... microscopy. Along this line, this paper undertakes the problem of coupled flexural-torsional nonlinear vibrations of a piezoelectrically actuated microcantilever beam as a typical configuration utilized in these applications. The actuation and sensing are both facilitated through bonding a piezoelectric...

... 2006 damping finite element analysis mirrors piezoelectric actuators vibrations Membrane mirrors are thin, flexible, and lightweight optical surfaces used as satellite lenses that can be stored compactly. These mirrors are expected to enhance inflatable space technology by providing...

... with an experimental example to demonstrate the feasibility of the proposed procedure. Seeley , C. E. , and Chattopadhyay , A. , 1998 , “ Experimental Investigation of Composite Beams With Piezoelectric Actuation and Debonding ,” Smart Mater. Struct. 0964-1726 , 7 , pp. 502 – 511 . Wang...

... controllability observability optimisation piezoelectric actuators sensors flexible linkage mechanism vibration control sensor actuator placement optimization The equations of motion in the state space can be expressed as 3 A ¯ x ¯ ̇ + B ¯ x ¯ = D ¯ 1 P...

...Dimitris Varelis; Dimitris A. Saravanos A coupled theoretical and computational framework is presented for analyzing the small amplitude-free vibrational response of composite laminated plates with piezoelectric actuators and sensors, subject to nonlinear effects due to large rotations and initial...

...Eric M. Mockensturm; Raghavan Balaji One-way clutches and clutch bearings are being used in a wide variety of dynamic systems. Motivated by their recent use as ratchets in piezoelectric actuators and decoupling devices in serpentine belt drives, a method of analysis of systems containing one-way...

... . Manuscript received May 2002; Revised March 2003. Associate Editor: M. I. Friswell. 01 May 2002 01 March 2003 30 07 2004 laser velocimetry structural acoustics piezoceramics piezoelectric actuators piezoelectric transducers In summary, the review of the technical...

... . Manuscript received March 2003; Revised December 2003. Associate Editor: J. A. Main. 01 March 2003 01 December 2003 30 07 2004 structural acoustics vibrations vibration control composite materials piezoelectric actuators feedback damping electrorheology Vibrations...

.... Associate Editor: J. A. Wickert. 01 May 2002 01 September 2003 04 05 2004 1 Toroidal shell section laminated with piezoelectric actuators Assume that the total response of the toroidal shell is composed of all participating modes based on the modal expansion concept...

... and unmodeled dynamics. Contributed by the Technical Committee on Vibration and Sound for publication in the JOURNAL OF VIBRATION AND ACOUSTICS . Manuscript received September 2002; Revised August 2003. Associate Editor: L. A. Bergman. piezoelectric actuators beams (structures) flexible structures...

...James D. Ervin, Graduate Student; Diann E. Brei, Assistant Professor, Assoc. Mem. ASME A new family of piezoelectric actuators, called Recurves, exhibits high work per volume and have the extra benefit of performance and packaging tailorability. The focus of this paper is the dynamic performance...

... direction. The active journal gas bearings used are of the tilting-pad type with one traditional passive pad and two active pads with embedded piezoelectric actuators. Feedback control systems are constructed with gap sensors for measuring the vibration of the rotor, embedded piezoelectric actuators...

... damping piezoceramics piezoelectric actuators Tuned piezoceramic resonant shunts have been adding damping to lightweight flexible structures for over two decades 1 2 3 . Recently, researchers have been investigating the use of piezoceramic switching shunts to add damping to structures...