Projects

@article{J15b,

title = {Simultaneous Optimization of Damping and Tracking Controller Parameters via Selective Pole Placement for Enhanced Positioning Bandwidth of Nanopositioners},

author = {D. Russell and A. J. Fleming and S. S. Aphale},

url = {https://www.precisionmechatronicslab.com/wp-content/uploads/2015/07/DS-14-1539.pdf},

doi = {10.1115/1.4030723},

year  = {2015},

date = {2015-12-30},

journal = {Journal of Dynamic Systems, Measurement and Control},

volume = {137},

number = {10},

pages = {1-8},

abstract = {Positive Velocity and Position Feedback (PVPF) is a widely used control scheme in lightly damped resonant systems with collocated sensor actuator pairs. The popularity of PVPF is due to the ability to achieve a chosen damping ratio by repositioning the poles of the system. The addition of a tracking controller, to reduce the effects of inherent nonlinearities, causes the poles to deviate from the intended location and can be a detriment to the damping achieved. By designing the PVPF and tracking controllers simultaneously, the optimal damping and tracking can be achieved. Simulations show full damping of the first resonance mode and significantly higher bandwidth than that achieved using the traditional PVPF design method, allowing for high speed scanning with accurate tracking. Experimental results are also provided to verify performance in implementation.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{J15e,

title = {Low-order Damping and Tracking Control for Scanning Probe Systems},

author = {A. J. Fleming and Y. R. Teo and K. K. Leang

},

url = {https://www.precisionmechatronicslab.com/wp-content/uploads/2015/12/J15e.pdf},

doi = {10.3389/fmech.2015.00014},

year  = {2015},

date = {2015-12-30},

journal = {Frontiers in Mechanical Engineering},

volume = {1},

pages = {1-9},

abstract = {This article describes an improvement to integral resonance damping control (IRC) for reference tracking applications such as Scanning Probe Microscopy and nanofabrication. It is demonstrated that IRC control introduces a low-frequency pole into the tracking loop which is detrimental for performance. In this work, the location of this pole is found analytically using Cardano’s method then compensated by parameterizing the tracking controller accordingly. This approach maximizes the closed-loop bandwidth whilst being robust to changes in the resonance frequencies. The refined IRC controller is comprehensively compared to other low-order methods in a practical environment.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}