ON ANALOG FEEDBACK CONTROL FOR MAGNETOSTRICTIVE TRANSDUCER LINEARIZATION

• Published in: Journal of sound and vibration Vol. 211; no. 3; pp. 481 - 494
• Main Authors: Hall, D.L., Flatau, A.B.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: London Elsevier Ltd 02.04.1998; Elsevier
• Subjects: Exact sciences and technology; Fundamental areas of phenomenology (including applications); General equipment and techniques; Instruments, apparatus, components and techniques common to several branches of physics and astronomy; Physics; Servo and control equipment; robots; Solid mechanics; Structural and continuum mechanics; Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...); Vibrations and mechanical waves; Actuators; Magnetostriction; Active system; Analog control; Vibration control; Magnetostrictive devices; Non linear effect; Experimental study; Modeling; PD regulator
• ISSN: 0022-460X; 1095-8568
• DOI: 10.1006/jsvi.1997.1322

The magnetostrictive transducer output force, displacement, and bandwidth characteristics are well suited for a variety of active vibration control applications. However, their use is limited in part because these transducers are known to be non-linear. The transducer in this study is assumed to be a linear system and its output harmonics are assumed to be disturbance inputs. Two feedback control models are proposed and one is used to obtain expressions for predicting the change in harmonic amplitudes of displacement and acceleration as functions of frequency and parameters for the controller, load, and transducer. An approach based on magnetostrictive transduction modelling is presented for experimentally determining appropriate transducer model parameters for use in the feedback control model. Experimental measurements using simple, analog, PD (proportional plus derivative) acceleration feedback control are presented to validate the expressions. The closed loop feedback control system model resulted in predicted changes in harmonic acceleration amplitudes ranging from +2 to −30 dB (depending upon the frequency of the disturbance input) that were verified experimentally. A significant extension of the linear range of transducer behaviour, due to feedback control, is also demonstrated.