Projects

@article{J15c,

title = {Optimal integral force feedback for active vibration control},

author = {Y. R. Teo and A. J. Fleming},

url = {https://www.precisionmechatronicslab.com/wp-content/uploads/2015/10/J15c.pdf},

year  = {2015},

date = {2015-06-27},

journal = {Journal of Sound and Vibration},

volume = {356},

number = {11},

pages = {20-33},

abstract = {This paper proposes an improvement to Integral Force Feedback (IFF), which is a popular method for active vibration control for structures and mechanical systems. Benefits of IFF includes robustness, guaranteed stability and simplicity. However, the maximum damping performance is dependent on the stiffness of the system; hence, some systems cannot be adequately controlled. In this paper, an improvement to the classical force feedback control scheme is proposed. The improved method achieves arbitrary damping for any mechanical system by introducing a feed-through term. The proposed improvement is experimentally demonstrated by actively damping an objective lens assembly for a high-speed confocal microscope.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{J14b,

title = {Piezoelectric Actuators with Integrated High Voltage Power Electronics},

author = {A. J. Fleming and Y. K. Yong},

url = {https://www.precisionmechatronicslab.com/wp-content/uploads/2015/10/J14b.pdf},

year  = {2015},

date = {2015-04-01},

journal = {IEEE/ASME Transactions on Mechatronics},

volume = {20},

number = {2},

pages = {611-617},

abstract = {This article explores the possibility of piezoelectric actuators with integrated high voltage power electronics. Such devices dramatically simplify the application of piezoelectric actuators since the power electronics are already optimized for the voltage range, capacitance, and power dissipation of the actuator. The foremost consideration is the thermal impedance of the actuator and heat dissipation. Analytical and finite-element methods are described for predicting the thermal impedance of a piezoelectric bender. The predictions are compared experimentally using thermal imaging on a piezoelectric bender with laminated miniature power electronics.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{Yong2015,

title = {Collocated Z-Axis Control of a High-Speed Nanopositioner for Video-Rate Atomic Force Microscopy},

author = {Y. K. Yong and S. O. R. Moheimani},

url = {http://www.eng.newcastle.edu.au/~yy582/Papers/Yong%202015%20-collocated%20Z-axis%20control.pdf},

doi = {10.1109/TNANO.2015.2394327},

issn = {1536-125X},

year  = {2015},

date = {2015-03-01},

journal = {IEEE Transactions on Nanotechnology},

volume = {14},

number = {2},

pages = {338-345},

abstract = {A key hurdle to achieve video-rate atomic force microscopy (AFM) in constant-force contact mode is the inadequate bandwidth of the vertical feedback control loop. This paper describes techniques used to increase the vertical tracking bandwidth of a nanopositioner to a level that is sufficient for video-rate AFM. These techniques involve the combination of: a high-speed XYZ nanopositioner; a passive damping technique that cancels the inertial forces of the Z actuator which in turns eliminates the low 20-kHz vertical resonant mode of the nanopositioner; an active control technique that is used to augment damping to high vertical resonant modes at 60 kHz and above. The implementation of these techniques allows a tenfold increase in the vertical tracking bandwidth, from 2.3 (without damping) to 28.1 kHz. This allows high-quality, video-rate AFM images to be captured at 10 frames/s without noticeable artifacts associated with vibrations and insufficient vertical tracking bandwidth.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}