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Micro-position Control of a Piezostack Actuator Using Rate-Dependent Hysteretic Compensator
Phuong-Bac Nguyen,최승복 한국정밀공학회 2011 International Journal of Precision Engineering and Vol.12 No.5
This paper presents a new model for hysteresis compensation of a piezostack in order to improve position control accuracy. After establishing the hysteretic relationship between output displacement of the piezostack actuator and input voltage by adopting Preisach model, a rate-dependent hysteretic compensator proposed in this work is formulated. The proposed compensator consists of two components: a rate-independent hysteresis cascaded with a dynamic component. From the first component, a compensator is designed based on the inverse Preisach model. And then, the dynamic component is eliminated using a nonlinear lag controller. In order to tune this controller, a root least square (RLS) inverse identification method is used. In order to demonstrate the effectiveness of the proposed hysteretic compensator, micro-position control performances are experimentally evaluated in time domain. Control performances are evaluated upon three different input voltage conditions: constant frequency, chirp and random waveforms. In addition, a comparative work between the proposed compensator and conventional rate-independent compensator is undertaken.
Position Tracking Control of Flexible Piezo-beam Considering Actuator Hysteresis
프엉박(Nguyen, Phuong-Bac),최승복(Choi, Seung-Bok) 한국소음진동공학회 2010 한국소음진동공학회 논문집 Vol.20 No.2
This paper presents a position tracking control of a flexible beam using the piezoelectric actuator. This is achieved by implementing both feedforward hysteretic compensator of the actuator and PID feedback controller. The Preisach model is adopted to develop the feedforward hysteretic compensator. In the design of the compensator, estimated displacement of the piezoceramic actuator is used based on the limiting triangle database that results from collecting data of the main reversal curve and the first order ascending curves. Experimental implementation is conducted for position tracking control and performance comparison is made between a PID feedback controller without considering the effect of hysteresis, and a PID feedback controller integrated with the feedforward hysteretic compensator.
Highly efficient adsorption of arsenite from aqueous by zirconia modified activated carbon
Pham Ngoc Chuc,Nguyen Quang Bac,Dao Thi Phuong Thao,Nguyen Trung Kien,Nguyen Thi Ha Chi,Nguyen Van Noi,Vo Thang Nguyen,Nguyen Thi Hong Bich,Dao Ngoc Nhiem,Dinh Quang Khieu 대한환경공학회 2024 Environmental Engineering Research Vol.29 No.2
Huong, Truong Thu,Bac, Ta Phuong,Thang, Bui Doan,Long, Dao Minh,Quang, Le Anh,Dan, Nguyen Minh,Hoang, Nguyen Viet International Journal of Computer ScienceNetwork S 2021 International journal of computer science and netw Vol.21 No.6
Since machine learning was invented, there have been many different machine learning-based algorithms, from shallow learning to deep learning models, that provide solutions to the classification tasks. But then it poses a problem in choosing a suitable classification algorithm that can improve the classification/detection efficiency for a certain network context. With that comes whether an algorithm provides good performance, why it works in some problems and not in others. In this paper, we present a data-centric analysis to provide a way for selecting a suitable classification algorithm. This data-centric approach is a new viewpoint in exploring relationships between classification performance and facts and figures of data sets.
오종석(Jong-Seok Oh),신원기(Won-Ki Shin),프엉박(Phuong-Bac Nguyen),엄창호(Chang-Ho Uhm),최승복(Seung-Bok Choi) 한국소음진동공학회 2012 한국소음진동공학회 학술대회논문집 Vol.2012 No.10
In this work, 4 DOF ER haptic master is proposed and integrated with a slave robot for minimally invasive surgery (MIS). Using a controllable ER fluid, the haptic master can generate a repulsive force/torque with the 4-DOF motion. For realization of master-slave robot system, the motion command of the haptic master is realized by slave surgery robot. In order to follow the 4 DOF motion of the haptic master, novel mechanism of slave surgery robot with gimbal joint is devised. Accordingly, the haptic master-slave robot system is established by incorporating the slave robot with the haptic master device in which the desired repulsive force/torque and position are transferred to each other via wireless communications. In order to obtain the desired force/torque and position trajectories, tracking controllers for haptic master and slave robot are designed and implemented, respectively. It has been demonstrated that the desired effective torque tracking control performance is well achieved using the proposed haptic master-slave robot system.