RESEARCH EXPERIENCE

2019.05-

• To be continued

2018.07-2019.05

• Design and implementation of control system on Autonomous Guided Vehicle (AGV) platforms

2017-2018

• Design and implementation of servo control system on low cost robotic arm platforms

2015-2017

• Development of monitoring and control system for additive manufacturing processes

2013-2015

• Development of Hybrid Propulsion System for UAVs

The development of hybrid propulsion system aims to achieve a higher energy efficiency than the conventional ICE based Propulsion system. Key research and technical work for developing the hybrid propulsion system includes:

• • 1. Selection of IC Engine, battery, motor and generator for aerospace use, under the consideration of power density and system specifications.

    2. Design of AC-DC rectifier with high efficiency.

    3. Design of DC-DC bi-directional converter with high efficiency.

    4. Sensor-less control of Permanent Magnet Synchronous Motor/Generator (PMSM).

    5. System integration.

Main work on designing sensor-less control techniques for PMSM/G, which includes:

• • 1. Online identification of the system parameters.

    2. Estimation of the rotor position and speed based on sliding mode observer method and model adaptive method for PMSM operating at medium and high speed.

    3. Estimation of the rotor position based on signal injection method for PMSM operating at standstill and low speed.

    4. Design of dual-loop FOC control of PMSM.

    5. Verification of the developed techniques through simulations and experimental testings.

• Design of Novel Control Techniques for High Performance Electronic Converter for Green Data Centers

To improve the energy efficiency of the power distribution system in data centers, the following research work is conducted:

• 1. A four-Leg three-phase inverter is used in the power distribution system for data-centers.

  2. Novel control techniques are proposed to control the output voltage of the inverter to eliminate the neutral current, which can help to reduce the thermal loss in the system.

  3. Verification of the developed control methods through simulations and experimental testings.

2008-2013

• • Development of an underactuated two-wheeled mobile robot (2WMR).

    • 1. The motor encoder, accelerometer and rate gyro are used to measure the states of the 2WMR.

      2. The micro-controller is used to process the measured data and compute the control input according to the designed control algorithms.

      3. The motor is the only actuator which generates the torque to drive the wheels meanwhile balance the pendulum.

Online Vedios: Stabilization of the Robot

Moving and Balancing

• Design of control algorithms for underactuated mechanical systems.

1. Modeling of general underactuated mechanical systems

2. Optimal and robust linear control methods.

3. Robust design based on sliding mode control (SMC) method.

4. Robust design based on fuzzy logic control (FLC) method.

5. Synthesized design of SMC and linear control method.

6. Synthesized design of FLC and linear control method.

• Implementation of the proposed control algorithms on the 2WMR.

  • • 1. Sensors calibration and signal processing.

      2. Embedded micro-controller programming.

      3. Implementation of both linear and nonlinear controllers on the real-time platform.

      4. Tuning of the controller parameters and experiment results analysis.