A5071429693- Hydraulic and Pneumatic Systems
- Advanced Sensor and Energy Harvesting Materials
- Adaptive Control of Nonlinear Systems
- Advanced Sensor and Control Systems
- Electric and Hybrid Vehicle Technologies
- Prosthetics and Rehabilitation Robotics
- Vibration Control and Rheological Fluids
- Dielectric materials and actuators
- Fuel Cells and Related Materials
- Iterative Learning Control Systems
- Wave and Wind Energy Systems
- Elevator Systems and Control
- Control Systems in Engineering
- Muscle activation and electromyography studies
- Industrial Technology and Control Systems
- Fault Detection and Control Systems
- Conducting polymers and applications
- Oil and Gas Production Techniques
- Vehicle Dynamics and Control Systems
- Piezoelectric Actuators and Control
- Shape Memory Alloy Transformations
- Teleoperation and Haptic Systems
- Industrial Automation and Control Systems
- Innovative Energy Harvesting Technologies
- Real-time simulation and control systems
University of Ulsan
2016-2025
Weatherford College
2023
Ho Chi Minh City University of Technology
2021
ORCID
2019-2021
Ulsan University Hospital
2006-2020
This paper presents an adaptive position control for a pump- controlled electrohydraulic actuator (EHA) based on backstepping scheme. The core feature of this is the combination modified algorithm with special adaptation law to compensate all nonlinearities and uncertainties in EHA system. First all, mathematical model developed. then formulated using technique hydraulic system are adapted by employing Lyapunov function. signal consists simple robust structure ensure robustness corresponding...
Dielectric, ferroelectric, piezoelectric, and strain properties of lead-free Sn-doped Bi1/2(Na0.82K0.18)1/2TiO3 (BNKT) were investigated. A crossover from a nonergodic relaxor to an ergodic state at room temperature, accompanied by giant electric-field-induced strain, was observed 5 at. % Sn doping. Switching dynamics monitored during bipolar poling cycle manifested that the originates incipient piezoelectricity. When doping level reached 8 %, BNKT exhibited electrostrictive behavior with...
The electrohydraulic elastic manipulator (EEM) includes an servo system and a variable stiffness mechanism. It is complex with nonlinear elements, such as friction, parametric uncertainties, modeling error well coupling torques in the joint. This paper focuses on developing equilibrium position controller for EEM presence of matched unmatched uncertainties. proposed based backstepping scheme optimized using adaptive sliding mode technique PI structure. To estimate parameters known functions...
Produced by magnetic material dispersed in a viscous environment for the purpose of collecting and converting energy, rheological compounds greatly strengthen development skin-attachable wearable electrical equipment. Given that nanomaterial anisotropy has substantial influence on interface polarizing polyvinylidene fluoride (PVDF), it is critical to explore function polymer triboelectric layer nanogenerator (TENG) output power. In this study, ferromagnetic cobalt ferrite, CoFe2O4 (CFO),...
Abstract The electro-hydraulic servo system (EHSS) usually faces multiple sensor faults and disturbances, which is difficult to achieve good tracking control, reliability, stability control. In this article, an advanced fault-tolerant controller proposed for EHSS deal with the above challenge. three fault observers, called nonlinear unknown input observers (NUIOs), are developed effectively estimate position, velocity, pressure states. detection, estimation, isolation then presented as...
In this paper, an adaptive fuzzy sliding-mode control (AFSMC) was proposed for speed of a hydraulic pressure coupling drive. The AFSMC combined direct scheme and sliding in new structure to reduce the tracking error chattering effort. input nonlinearity secondary unit, dead zone, taken into account during controller synthesis analysis stability closed-loop system. system proven from Lyapunov's sense. Experiments were performed with different controllers, AFSMC, traditional control, PID under...
Researches for improving the control performance of hydraulic systems in both accuracy and energy efficiency have never stopped aerospace industrial applications. The existence nonlinearities, uncertainties, unknown terms system dynamics, however, significantly limits desired performance. To realize improvements by dealing with these problems, an advanced position controller incorporated effective disturbance observers (DOs) applied a pump-controlled is proposed this article. Here,...
This paper proposes an advanced position-tracking control approach, referred to as integrated intelligent nonlinear controller, for a pneumatic artificial muscle (PAM) system. Due the existence of uncertain, unknown, and terms in system dynamics, it is difficult derive exact mathematical model with robust performance. To overcome this problem, main contributions are follows. actively represent behavior PAM using grey-box model, neural networks employed equivalent internal dynamics optimized...