@article{panusittikorn_ro_2008, title={Modeling and control of a magnetostrictive tool servo system}, volume={130}, ISSN={["0022-0434"]}, DOI={10.1115/1.2837432}, abstractNote={A magnetostrictive actuator offers a long mechanical strain output in a broad bandwidth at a cost of a highly nonlinear magnetic hysteresis. Full utilization of this actuator in precision manufacturing requires a feedback loop as well as an advanced control scheme. A robust control scheme using sliding mode control with a variable switching gain was tailored to the nonlinear transducer. Nominal feedforward current controller that drives the magnetostriction was based on the inverse anhysteresis model. An additional switching gain based on the Lyapunov stability condition is implemented to restrain uncertainties. Compared to a traditional closed-loop control design, the proposed algorithm experimentally showed a greatly enhanced performance.}, number={3}, journal={JOURNAL OF DYNAMIC SYSTEMS MEASUREMENT AND CONTROL-TRANSACTIONS OF THE ASME}, author={Panusittikorn, Witoon and Ro, Paul I.}, year={2008}, month={May} }
 @article{panusittikorn_lee_ro_2004, title={Modeling and sliding-mode control of friction-based object transport using two-mode ultrasonic excitation}, volume={51}, ISSN={["1557-9948"]}, DOI={10.1109/TIE.2004.831761}, abstractNote={This paper introduces a magnetic-free object transport system driven by a friction force on an ultrasonic flexural vibrating beam. This driving mechanism offers unique advantages of silent operation and lubricant-free structure. The characteristics are ideal for a transport system in a clean-room environment. However, the friction drive described by Hertzian contact and Coulomb friction theories is highly nonlinear. The transport system needs a sophisticated control design to deliver a load to a precise location. A traditional feedback controller and sliding-mode control were implemented in the presence of sensor noise and hardware limitation. It is experimentally shown that the tracking performance of the proposed control scheme is superior to the traditional control design.}, number={4}, journal={IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS}, author={Panusittikorn, W and Lee, MC and Ro, PI}, year={2004}, month={Aug}, pages={917–926} }