Design and control of six degree-of-freedom active vibration isolation table.

A six-axis active vibration isolation system (AVIS) is designed by using the direct driven guide and ball contact mechanisms in order to have no cross-coupling between actuators. The point contact configuration gives an advantage of having an easy assembly of eight voice coil actuators to an upper and a base plate. A voice coil actuator is used since it can provide a large displacement and sufficient bandwidth required for vibration control. The AVIS is controlled considering the effect of flexible vibration mode in the upper plate and velocity sensor dynamics. A loop shaping technique and phase margin condition are applied to design a vibration controller. The performances of the AVIS are investigated in the frequency domain and finally validated by comparing with the passive isolation system. The scanning profiles of the specimen are compared together by using the atomic force microscope. The robustness of the AVIS is verified by showing the impulse response.

[1]  Stephen J. Elliott,et al.  Multichannel feedback control for the isolation of base-excited vibration , 2000 .

[2]  Jia-Yush Yen,et al.  Sliding mode control for active vibration isolation of a long range scanning tunneling microscope , 2004 .

[3]  A. I. Oliva,et al.  Vibration isolation analysis for a scanning tunneling microscope , 1992 .

[4]  Michael J. Brennan,et al.  Active Vibration Isolation Using an Electrical Damper or an Electrical Dynamic Absorber , 2008, IEEE Transactions on Control Systems Technology.

[5]  Seok Heo,et al.  Development of the passive-active vibration absorber using piezoelectric actuators , 2002, SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring.

[6]  Stephen J. Elliott,et al.  Centralized and decentralized control of structural vibration and sound radiation , 2006 .

[7]  Calvin F. Quate,et al.  Theories of the feedback and vibration isolation systems for the scanning tunneling microscope , 1987 .

[8]  Hitay Özbay,et al.  Introduction to Feedback Control Theory , 1999 .

[9]  Zahidul H. Rahman,et al.  Vibration isolation and suppression system for precision payloads in space , 1999 .

[10]  Koji Kajimura,et al.  Vibration isolation for scanning tunneling microscopy , 1987 .

[11]  M. R. BAI,et al.  CONTROL DESIGN OF ACTIVE VIBRATION ISOLATION USING μ -SYNTHESIS , 2002 .

[12]  Kyihwan Park,et al.  A voice coil actuator driven active vibration isolation system with the consideration of flexible modes. , 2008, The Review of scientific instruments.