Irfan Khan received his BE degree in Mechatronics Engineering from NUST in May 2009. He got his Master Degree in Mechatronics Engineering from AUS in October 2013. During his master thesis, he worked on nonlinear robust control and torsional vibration suppression in elastic drive systems. He started PhD in November 2013. During his PhD, he is working on structural vibration suppression using hybrid active and semi-active control.
Research interests
- Nonlinear control
- Vibration suppression in elastic systems
- Robotics
Current research
For the last few years, I have been working on a project to design a nonlinear hybrid controller using active actuator and a semi-active device for vibration suppression in flexible structures. The key novelty is to use the hybrid controller to enable the semi-active device to achieve a performance as close to a fully active device as possible. This is accomplished by ensuring that the active actuator can assist the semi-active in the regions where energy is required. Also, the hybrid active & semi-active controller is designed to minimise the switching of the semi-active controller. The control framework used is the immersion and invariance control technique in combination with a sliding mode control.
Displacement of mass m2 controlled to follow the reference system with the hybrid active and semi-active controller.
Active and semi-active control signals in hybrid active and semi-active controller.
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Semi-active control signal in hybrid active and semi-active and semi-active controllers, (left) with respect to the relative velocity, (right) with respect to the time.
Publications
Journal papers
- I. U. Khan, D. Wagg and N. D. Sims “Improving the vibration suppression capabilities of a magneto-rheological damper hybrid active and semi-active control,” Smart Materials and Structures 25.8 (2016): 085045.
- I. U. Khan, D. Wagg and N. D. Sims “Nonlinear Robust Observer Design Using An Invariant Manifold Approach,” Control Engineering Practice 55 (2016): 69-79.
- I. U. Khan and R. Dhaouadi, “Robust control of elastic drives through immersion and invariance,” IEEE Transactions on Industrial Electronics, vol. 62, no. 3, pp. 1572–1580, 2015.
Conference papers
- I. U. Khan, D. Wagg and N. D. Sims “Hybrid Active and Semi-Active Control for Vibration Suppression in Flexible Structures." In ASME 2016 Dynamic Systems and Control Conference, pp. V001T11A001-V001T11A001. American Society of Mechanical Engineers, 2016.
- I. U. Khan, D. Wagg and N. D. Sims “Hybrid active and semi-active control for pantograph-catenary system of high-speed train,” 27th International Conference on Noise and Vibration, ISMA, Sept 2016.
- I. U. Khan and R. Dhaouadi, “Vibration suppression in elastic drive systems using the immersion and invariance methodology,” 3rd International Conference on Electric Power and Energy Conversion Systems, pp. 1–6, 2013.
- I. U. Khan and R. Dhaouadi, "Nonlinear reduced order observer design for elastic drive systems using invariant manifolds," IEEE International Conference on Mechatronics (ICM), pp.58-63, 2015.