A Hybrid Actuation System (HYBAS) and Aerospace Applications
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A Hybrid Actuation System (HYBAS) and Aerospace Applications Ji Sua, Tian-Bing Xub, Shujun Zhangc, Thomas R. Shroutc, and Qiming Zhangc a NASA Langley Research Center, Hampton, VA 23681 b National Institute of Aerospace, 144 Research Drive, Hampton, VA 23666 c Materials Research Institute, The Pennsylvania State University, University Park, PA 16802
ABSTRACT An electroactive polymer-ceramic hybrid actuation system (HYBAS) has been developed at NASA Langley Research Center. The system demonstrates significantly-enhanced electromechanical performance by cooperatively utilizing advantages of a combination of electromechanical responses of an electroative polymer (EAP), and an electroactive ceramic single crystal, PZN-PT single crystal. The electroactive elements are driven by a single power source. Recently, a modification of HYBAS has been made to increase the capability of air driving for synthetic jet devices (SJ) used in aerodynamic control technologies. The dependence of the air driving capability of the modified HYBAS on the configuration of the actuating device has been investigated. For this particular application, the modified HYBAS demonstrated a 50% increase in the volume change in the synthetic jet air chamber, as compared with that of the HYBAS without the modification. The theoretical modeling of the performances of the HYBAS is in good agreement with experimental observation. The consistence between the theoretical modeling and experimental test make the design concept an effective route for the development of high performance actuating devices for many applications. The theoretical modeling, fabrication of the HYBAS and the initial experimental results will be presented and discussed. Keywords: Hybrid, actuation system, electroactive polymer, electroactive ceramics, HYBAS.
1. INTRODUCTION Actuators using electromechanical mechanisms have been widely used in many civilian and military applications including active vibration control, noise control, underwater navigation and surveillance,1,2 as well as aerodynamic flow control in aerospace technologies.3 In many of these applications, actuators with high power and high displacement output are demanded. In the past several decades, a great deal of effort has been devoted to the development of electromechanical materials with those desired features. 4-7 Since Newnham et.al.8 invented the metal-ceramic composite actuators, many device configurations have been exploited for amplified displacement and enhanced performance efficiency.9 The present work is to develop an electromechanical actuation system utilizing the characterization of the electromechanical performance of these two types of electroactive materials in a cooperative and effective way. A hybrid actuation system (HYBAS) was designed and fabricated using an electrostrictive polymer and an electrostrictive The system showed a significantly enhanced electromechanical performance compared to the single crystal.10 performances of the device made of each constituting material, the electr
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