Smart spring: a novel adaptive impedance control approach for active vibration suppression applications

Most active vibration suppression approaches have attempted to suppress structural vibration by incorporating active material actuators, such as piezoceramic, within the structure to act directly against vibratory loads. These approaches require the piezoceramic actuators to generate significant force and deflection simultaneously to effectively suppress vibration. Unfortunately, successful implementation of these approaches has been hindered by the limited displacement capabilities of piezoceramic actuators. The Smart Spring concept is an unique approach to actively control combinations of dynamic impedance characteristics of a structure, such as the stiffness, damping, and effective mass to suppress vibration in an indirect manner. The piezoceramic actuators employed in the Smart Spring concept are not used to directly counteract excitation loads but rather adaptively vary the effective impedance properties of the structure. Therefore, the piezoceramic actuators in the Smart Spring are not required to produce large forces and deflections simultaneously. This paper demonstrates the ability of the Smart Spring concept to control dynamic impedance characteristics of a structure through numerical simulations and experimental investigations. Mechanical shaker tests using the proof-of-concept hardware verified the controllability of the impedance properties using the Smart Spring device and its ability to suppress vibration. More importantly, the tests conducted in a wind tunnel demonstrated the performance of the Smart Spring under highly varying unsteady excitation conditions. These tests confirmed that the Smart Spring system is able to actively suppress vibration through adaptive control of structural impedance properties.

[1]  Farhan Gandhi,et al.  Helicopter Vibration Reduction through Cyclic Variations in Rotor Blade Root Stiffness , 1999 .

[2]  Michael J. Brennan,et al.  Experimental investigation of different actuator technologies for active vibration control , 1999 .

[3]  Aaas News,et al.  Book Reviews , 1893, Buffalo Medical and Surgical Journal.

[4]  Lee,et al.  Results From The Dynamically Tailored Airframe Structures Program , 2002 .

[5]  S. Hall,et al.  Closed-loop vibration control experiments on a rotor with blade mounted actuation , 2000 .

[6]  Larry Jay McQuien.  Aeroelastic analysis of a helicopter rotor , 1977 .

[7]  G. G. Stokes.  "J." , 1890, The New Yale Book of Quotations.

[8]  Friedrich K. Straub,et al.  Design and testing of a double X-frame piezoelectric actuator , 2000, Smart Structures.

[9]  Inderjit Chopra,et al.  Review of State of Art of Smart Structures and Integrated Systems , 2002 .

[10]  Victor Giurgiutiu,et al.  RECENT ADVANCES IN SMART-MATERIAL ROTOR CONTROL ACTUATION. , 2000 .

[11]  Chen Yong,et al.  SMART SPRING - AN ACTIVELY TUNABLE VIBRATION ABSORBER DESIGNED TO CONTROL AEROELASTIC RESPONSE , 2003 .

[12]  David G. Zimcik,et al.  Feedforward Piezoelectric Structural Control: An Application to Aircraft Cabin Noise Reduction , 2001 .

[13]  David B. Domzalski,et al.  Development of a piezoelectric actuator for trailing edge flap control of full scale rotor blades , 2001 .

[14]  Sung-Dae Kim,et al.  ACTIVE CONTROL OF MULTI-TONAL NOISE WITH REFERENCE GENERATOR BASED ON ON-LINE FREQUENCY ESTIMATION , 1999 .

[15]  E. A. Avellone,et al.  Marks' Standard Handbook for Mechanical Engineers , 1916 .

[16]  Farhan Gandhi,et al.  Reduction of helicopter vibration through cyclic control of variable orifice dampers , 2002, The Aeronautical Journal (1968).