Compensation of mode shapes with a piezo electric actuator for an optical drive

In miniaturized systems (e.g. optical disk drives) much effort is made to design a structure in such a way that the demands on dimensions (height, width) and desired bandwidth are satisfied. Easier, and often cheaper designs can not be used, because they suffer from lower resonance frequencies, which limit the bandwidth. A method is presented for mechatronic structures that compensates unwanted bandwidth limiting resonance frequencies with an additional piezo electric actuator. Advantage of this method is that no extra sensor is used and that the contribution of the piezo is much easier to tune (when compared to a notch filter), since it is part of the structure. Disadvantage is that the piezo influences the dynamics of the original system, which complicates the choice of a suitable piezo actuator.

[1]  S. O. Reza Moheimani,et al.  Spatial resonant control of flexible structures-application to a piezoelectric laminate beam , 2001, IEEE Trans. Control. Syst. Technol..

[2]  H. Numasato,et al.  Settling control and performance of dual-actuator system for hard disk drives , 2001, Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148).

[3]  Daniel Y. Abramovitch,et al.  Magnetic and optical disk control: parallels and contrasts , 2001, Proceedings of the 2001 American Control Conference. (Cat. No.01CH37148).

[4]  Cyril M. Harris,et al.  Shock and vibration handbook , 1976 .

[5]  M Maarten Steinbuch,et al.  μ‐synthesis for a compact disc player , 1998 .

[6]  William C. Messner,et al.  On compensator design for linear time-invariant dual-input single-output systems , 2001 .

[7]  S.O. Reza Moheimani,et al.  Resonant controllers for flexible structures , 1999, Proceedings of the 38th IEEE Conference on Decision and Control (Cat. No.99CH36304).

[8]  Roberto Oboe,et al.  Modeling and control of a dual stage actuator hard disk drive with piezoelectric secondary actuator , 1999, 1999 IEEE/ASME International Conference on Advanced Intelligent Mechatronics (Cat. No.99TH8399).

[9]  S. O. Reza Moheimani,et al.  Spatial 𝒽2 control of a piezoelectric laminate beam: experimental implementation , 2002, IEEE Trans. Control. Syst. Technol..

[10]  C. K. Lee,et al.  Piezoelectric modal sensor/actuator pairs for critical active damping vibration control , 1991 .

[11]  E. F. Crawley,et al.  Development of Piezoelectric Technology for Applications in Control of Intelligent Structures , 1988, 1988 American Control Conference.

[12]  S. O. Reza Moheimani,et al.  Optimization and implementation of multimode piezoelectric shunt damping systems , 2002 .