Closed-Loop Control of Photovoltage for Photovoltaic-Electrostatic Driven Servo System

2016 ◽  
Author(s):  
X. J. Wang ◽  
F. Lu ◽  
J. H. Huang
Keyword(s):  
Control Strategy ◽  
Closed Loop ◽  
Uv Light ◽  
Servo System ◽  
Response Speed ◽  
Time Switching ◽  
Loop Control ◽  
Plzt Ceramic ◽  
Optical Shutter ◽  
The Mathematical Model

It is experimentally confirmed that the response speed of photo-induced deformation lags far behind the photovoltage and it is difficult to control the magnitude of the photo-induced electric field in PLZT ceramic due to the serious residual photovoltage. The primary purpose of this article is to control the photovoltage of PLZT for a photovoltaic-electrostatic driven servo system proposed in this paper. The control equations of photovoltage for photovoltaic-electrostatic driven servo system are derived based on the mathematical model of PLZT with coupled multi-physics fields. Parameters of photovoltage of PLZT ceramic during the illumination phase and light off phase are identified through the static experiment. Based on simple on-off control strategy, real-time switching the UV light via an optical shutter is adopted to achieve the desired photovoltage. Then, the closed-loop photovoltage control experiments for photovoltaic-electrostatic driven servo system based on PLZT ceramic are carried out. The experimental results show that the photovoltage can be successfully controlled at the target degree by switching the UV light with an optical shutter. The control strategy can be applied in the photovoltaic-electrostatic driven servo system to achieve the target degree of angular or displacement deflection.

scholarly journals A Closed-Loop Control Mathematical Model for Photovoltaic-Electrostatic Hybrid Actuator with a Slant Lower Electrode Based on PLZT Ceramic

Actuators ◽  
2021 ◽  
Vol 10 (11) ◽  
pp. 285
Author(s):  
Zhen Lv ◽  
Muhammad Uzair ◽  
Xinjie Wang ◽  
Yafeng Liu
Keyword(s):  
Mathematical Model ◽  
Closed Loop ◽  
Response Speed ◽  
Micro Electro Mechanical System ◽  
Lower Electrode ◽  
Loop Control ◽  
Output Displacement ◽  
Plzt Ceramic ◽  
The Mathematical Model ◽  
Hybrid Actuator

In this paper, a novel photovoltaic-electrostatic hybrid actuator with a slant lower electrode based on the PLZT ceramic is proposed. The mathematical model of photovoltaic-electrostatic hybrid actuator is established. Then, based on the mathematical model of photovoltaic-electrostatic hybrid actuator and the parameters identified, the mathematical simulation of the closed-loop displacement control for the photovoltaic-electrostatic hybrid actuator based on the PLZT ceramic is carried out. The results show that the displacement of the actuator can be controlled successfully at a particular value within the pull-in displacement by the light source. Furthermore, the response speed of the output displacement for photovoltaic-electrostatic hybrid actuator with a slant lower electrode is faster than that with a parallel lower electrode, offering a good potential to advance the current applications on micro-electro-mechanical system.

Research on Intelligent Control Strategy of Inverted Plasma Cutting Power

2011 ◽  
Vol 179-180 ◽  
pp. 1223-1228
Author(s):  
De Li Jia ◽  
Jin Song He ◽  
Ji Chao Ning ◽  
Chun Sheng Wang
Keyword(s):  
Neural Network ◽  
Control Strategy ◽  
Pid Controller ◽  
Closed Loop ◽  
Rbf Neural Network ◽  
Response Speed ◽  
Discrete Problem ◽  
Plasma Cutting ◽  
Cutting Power ◽  
Loop Control

The inverted plasma cutting power supply has multi-variable, nonlinear, strong coupling and time-varying characteristics and technological requirements. This paper proposes a decoupling control strategy based on fuzzy neural network expert system for the multi-parameter dynamic coupling and the uncertainty of the optimal output of the cutting process. It achieves the reasoning and decision-making through the fuzzy production rules. It adjusts the parameters of the neural network by adaptive algorithm, thus gets the optimal reference current of closed-loop controller, and then achieves the given current closed-loop control by means of RBF neural network adaptive PID controller. The simulation results show that the controller has good self-adaption and approximation. Compared with traditional PID controller, the system has great improvement on static accuracy, robustness and response speed. It is verified that the controller has the advantage of dealing with discrete problem and coupling multivariable problem.

Experimental Research on Deflection Control of Cantilever Beam Based on Hybrid Photovoltaic/Piezoelectric Actuation Mechanism

2016 ◽  
Author(s):  
F. Lu ◽  
X. J. Wang ◽  
Y. F. Liu
Keyword(s):  
Ultraviolet Light ◽  
Cantilever Beam ◽  
Closed Loop ◽  
Uv Light ◽  
Control Model ◽  
Closed Loop Control ◽  
Piezoelectric Actuation ◽  
Loop Control ◽  
Actuation Mechanism ◽  
Plzt Ceramic

When ultraviolet light illuminates on polarized PLZT ceramic, a large voltage can be generated between the electrodes due to the anomalous photovoltaic effect. The shape control of flexible shell can be realized by using hybrid photovoltaic/piezoelectric actuation. In this paper, a novel non-contact deflection closed-loop control model of cantilever beam based on hybrid photovoltaic/piezoelectric actuation can be proposed. The photovoltage of PLZT ceramic irradiated by ultraviolet light is applied to drive PVDF actuator. The closed-loop control equations of deflection of cantilever beam is derived based on the mathematical model of PLZT ceramic with coupled multi-physics fields and the constitutive model of cantilever beam. Then, parameters of deflection control equations of cantilever beam during illumination phase and light off phase are identified through the deflection static experiment. After that, the deflection closed-loop control experiment of cantilever beam based on hybrid photovoltaic/piezoelectric actuation mechanism is carried out to verify the control model. The experimental results show that the deflection of cantilever beam with a simple on-off control method can achieve the target value by applying UV light to PLZT ceramic. It also should be noted that, the deflection curve of cantilever beam illuminated by strong UV light has an undesirable fluctuation.

A Control Strategy for Intelligent Stamp Forming Tooling

2011 ◽  
Vol 133 (6) ◽  
Author(s):  
William J. Emblom ◽  
Klaus J. Weinmann
Keyword(s):  
Fuzzy Logic ◽  
Control Systems ◽  
Control Strategy ◽  
Pid Controller ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Linear Quadratic ◽  
Blank Holder ◽  
Loop Control ◽  
Stamp Forming

This paper describes the development and implementation of closed-loop control for oval stamp forming tooling using MATLAB®’s SIMULINK® and the dSPACE®CONTROLDESK®. A traditional PID controller was used for the blank holder pressure and an advanced controller utilizing fuzzy logic combining a linear quadratic gauss controller and a bang–bang controller was used to control draw bead position. The draw beads were used to control local forces near the draw beads. The blank holder pressures were used to control both wrinkling and local forces during forming. It was shown that a complex, advanced controller could be modeled using MATLAB’s SIMULINK and implemented in DSPACE CONTROLDESK. The resulting control systems for blank holder pressures and draw beads were used to control simultaneously local punch forces and wrinkling during the forming operation thereby resulting in a complex control strategy that could be used to improve the robustness of the stamp forming processes.

scholarly journals Using an Improved SIFT Algorithm and Fuzzy Closed-Loop Control Strategy for Object Recognition in Cluttered Scenes

PLoS ONE ◽  
2015 ◽  
Vol 10 (2) ◽  
pp. e0116323 ◽  
Author(s):  
Haitao Nie ◽  
Kehui Long ◽  
Jun Ma ◽  
Dan Yue ◽  
Jinguo Liu
Keyword(s):  
Object Recognition ◽  
Control Strategy ◽  
Closed Loop ◽  
Closed Loop Control ◽  
Sift Algorithm ◽  
Loop Control
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