Ph.D. dissertations

@article{LeangKK_2007,
title = {Feedback-linearized inverse feedforward for creep, hysteresis, and vibration compensation in AFM piezoactuators},
author = {K. K. Leang and S. Devasia},
url = {http://www.kam.k.leang.com/academics/pubs/LeangKK_2007.pdf},
year = {2007},
date = {2007-01-01},
journal = {IEEE Trans. Cont. Syst. Tech.},
volume = {15},
number = {5},
pages = {927 -- 935},
abstract = {In this brief, we study the design of a feedback and feedforward controller to compensate for creep, hysteresis, and vibration effects in an experimental piezoactuator system. First, we linearize the nonlinear dynamics of the piezoactuator by accounting for the hysteresis (as well as creep) using high-gain feedback control. Next, we model the linear vibrational dynamics and then invert the model to find a feedforward input to account vibration -- this process is significantly easier than considering the complete nonlinear dynamics (which combines hysteresis and vibration effects). Afterwards, the feedforward input is augmented to the feedback-linearized system to achieve high-precision high-speed positioning. We apply the method to a piezoscanner used in an experimental atomic force microscope to demonstrate the method’s effectiveness and we show significant reduction of both the maximum and root-mean-square tracking error. For example, high-gain feedback control compensates for hysteresis and creep effects, and in our case, it reduces the maximum error (compared to the uncompensated case) by over 90%. Then, at relatively high scan rates, the performance of the feedback controlled system can be improved by over 75% (i.e., reduction of maximum error) when the inversion-based feedforward input is integrated with the high-gain feedback controlled system.},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{LeangKK_2006,
title = {Design of hysteresis-compensating iterative learning control for piezo positioners: application to atomic force microscopes},
author = { K. K. Leang and S. Devasia},
year = {2006},
date = {2006-01-01},
journal = {Mechatronics},
volume = {16},
number = {3--4},
pages = {141 -- 158},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{ZouQ_2004,
title = {Control issues in high-speed AFM for biological applications: collagen imaging example},
author = { Q. Zou and K. K. Leang and E. Sadoun and M. J. Reed and S. Devasia},
year = {2004},
date = {2004-01-01},
journal = {Asian Journal of Control, Special issue on Advances in Nanotechnology Control},
volume = {6},
number = {2},
pages = {164-178},
keywords = {},
pubstate = {published},
tppubtype = {article}
}

@article{DeweyJS_1998,
title = {Experimental and theoretical results in output-trajectory redesign for flexible structures},
author = { J. S. Dewey and K. K. Leang and S. Devasia},
url = {http://www.kam.k.leang.com/academics/pubs/DeweyJS_1998.pdf},
year = {1998},
date = {1998-01-01},
journal = {ASME J. Dyn. Syst., Meas., and Control},
volume = {120},
number = {4},
pages = {456-461},
keywords = {},
pubstate = {published},
tppubtype = {article}
}