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Journal articles on the topic 'Closed-loop position-control'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Gorbet, R. B., and K. A. Morris. "Closed-Loop Position Control of Preisach Hystereses." Journal of Intelligent Material Systems and Structures 14, no. 8 (August 2003): 483–95. http://dx.doi.org/10.1177/104538903035391.

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2

Govinda Kumar, E., R. Prakash, S. Rishivanth, S. A. Anburaja, and A. Gopi Krishna. "Control of Antenna Azimuth Position using Fractional order Lead Compensator." International Journal of Engineering & Technology 7, no. 2.24 (April 25, 2018): 166. http://dx.doi.org/10.14419/ijet.v7i2.24.12023.

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This paper addresses the position control of antenna azimuth using proportional and integral (PI) controller and lead compensators. The fractional order calculus plays an important role for designing the robust control. The fractional order lead compensator is proposed for enhancing the closed loop performance of azimuth position control of antenna system. From the comparison of the closed loop responses, the proposed lead compensator delivers a superior closed loop performance when compared with PI controller and lead compensator.

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3

., Nataraj GS. "POSITION CHARACTERIZATION OF ELECTRO-PNEUMATIC CLOSED LOOP CONTROL VALVE." International Journal of Research in Engineering and Technology 02, no. 12 (December 25, 2013): 616–19. http://dx.doi.org/10.15623/ijret.2013.0212105.

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4

McCurdy, C. N. "Square One — A Simple Closed Loop Position Control System." Measurement and Control 18, no. 10 (December 1985): 368–71. http://dx.doi.org/10.1177/002029408501801002.

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5

Shirinzadeh, Bijan, Umesh Bhagat, and Yanling Tian. "Experimental Study of Laser Interferometry Based Motion Tracking of a Flexure-Based Mechanism." International Journal of Intelligent Mechatronics and Robotics 1, no. 3 (July 2011): 31–45. http://dx.doi.org/10.4018/ijimr.2011070103.

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This paper presents an experimental study of laser interferometry-based closed-loop motion tracking for flexure-based four-bar micro/nano manipulator. To enhance the accuracy of micro/nano manipulation, laser interferometry-based motion tracking control is established with experimental facility. The authors present and discuss open-loop control, model-based closed-loop control, and robust motion tracking closed-loop control for flexure-based mechanism. A comparative error analysis for closed-loop control with capacitive position sensor and laser interferometry feedback is discussed and presented. Model-based closed-loop control shows improvement in position and motion tracking over open-loop control. Robust control demonstrates high precise and accurate motion tracking of flexure-based mechanism compared to the model-based control. With this experimental study, this paper offers evidence that the laser interferometry-based closed-loop control can minimize positioning and tracking errors during dynamic motion, hence realizing high precision motion tracking and accurate position control.

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6

Jiang, Wei Hua, Yuan Cheng Fan, and Zheng Liu. "Double Position Loop Design of AC Servo Drive System." Applied Mechanics and Materials 529 (June 2014): 486–90. http://dx.doi.org/10.4028/www.scientific.net/amm.529.486.

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The loop controller of double position fully closed makes the AC servo drive system acquire a very high position accuracy and speed following which is hard to be achieved for time-varying parameters, load disturbance, AC motors and severely nonlinear controlled objects. For the system, the dynamic nature can be ensured by the inner position loop adopting PI regulation of half closed loop structure, while the stability and the immunity can be achieved by closed loop structures with the rings outside adopting dual-mode fuzzy control. This article analyzes the cause of positioning errors for servo motor and semi-closed loop structure. The article also explains how to design a two position closed-loop servo system based on fuzzy control by adopting the AC servo motor drive, the motor shaft back-end incremental photoelectric encoder to form the inner position loop and using the motion control card, the inner ring of servo system and the work platform of grating ruler to make up the outer position loop. Based on double position loop composed of three-dimensional laser processing gear, the accuracy of the three-axis linkage workbench position control and the speed following can be ensured, thus meeting the requirement of the laser subsurface engraving machine for high speed and high precision motion.

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7

Zhou, Xin. "The Study of Closed-Loop Position Control System Based on CNC Processing." Advanced Materials Research 941-944 (June 2014): 2243–46. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.2243.

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In view of the existing problems of indirect position closed-loop control, a digitized closed-loop control method is presented and a new kind of position control system with fully digitized closed-loop based on that method is developed. In this way, the fully digitized control of cutter trajectory is implemented with the features of digitized driving, digitized measuring and digitized position control, so that the machining accuracy of the NC machine tools is effectively assured. This system has been used on varieties of NC machine tools and very good results have been obtained in the machining of complex precision parts.

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8

Lenzhofer, M., A. Tortschanoff, A. Frank, T. Sandner, H. Schenk, M. Kraft, and A. Kenda. "MOEMS translatory actuator characterisation, position encoding and closed-loop control." Microsystem Technologies 16, no. 5 (February 5, 2010): 901–7. http://dx.doi.org/10.1007/s00542-010-1029-5.

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9

Zhu, Tang, Wang, Jiang, Zhao, and Li. "Absolute Stability Condition Derivation for Position Closed-Loop System in Hydraulic Automatic Gauge Control." Processes 7, no. 10 (October 18, 2019): 766. http://dx.doi.org/10.3390/pr7100766.

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In the metallurgical industry, hydraulic automatic gauge control (HAGC) is a core mechanism for thickness control of plates used in the rolling process. The stability of the HAGC system’s kernel position closed-loop is key to ensuring a process with high precision, speed and reliability. However, the closed-loop position control system is typically nonlinear, and its stability is affected by several factors, making it difficult to analyze instability in the system. This paper describes in detail the functioning of the position closed-loop system. A mathematical model of each component was established using theoretical analysis. An incremental transfer model of the position closed-loop system was also derived by studying the connections between each component. In addition, based on the derived information transfer relationship, a transfer block diagram of disturbance quantity of the system was established. Furthermore, the Popov frequency criterion method was introduced to ascertain its absolute stability. The results indicate that the absolute stability conditions of the position closed-loop system are derived in two situations: when spool displacement is positive or negative. This study lays a theoretical foundation for research on the instability mechanism of an HAGC system.

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10

Lygouras, J. N., K. A. Lalakos, and P. G. Ysalides. "High-performance position detection and velocity adaptive measurement for closed-loop position control." IEEE Transactions on Instrumentation and Measurement 47, no. 4 (1998): 978–85. http://dx.doi.org/10.1109/19.744653.

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11

Xing, Fei. "The Optical Path Closed-Loop Control System." Advanced Materials Research 998-999 (July 2014): 700–703. http://dx.doi.org/10.4028/www.scientific.net/amr.998-999.700.

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The optical path closed-loop control system mainly applies to large high power equipment that makes the optical path adjust automatically. The paper introduces the principle of optical path closed-loop system. In addition, it introduces the laser spot recognition algorithm and the PC real-time monitoring system. After the test, the system not only can accurately calculate the position of spot, but also realize the monitoring and adjustment of spot.

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12

Yan, Jian Guo, Ao Xi, Zi Bing Xiao, and Hai Xia Xiong. "The Application of Fuzzy Control in Position Control for Tanker Drag." Applied Mechanics and Materials 319 (May 2013): 553–57. http://dx.doi.org/10.4028/www.scientific.net/amm.319.553.

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In order to obtain much better control effect, position control system uses position-speed dual closed loop structure in the testing system of hard air refuel tanker drag system. According to the characteristics of nonlinear system, PID controller and fuzzy controller were taken as the outer loop controllers. The simulation results show that the fuzzy control system is superior to PID control. By comparing response curves with different load, it is easy to see that fuzzy control can be more effective than PID control in restraining overshoot and improving the dynamic performance.

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13

Watson, Connor, Rosario Obregon, and Tania K. Morimoto. "Closed-Loop Position Control for Growing Robots Via Online Jacobian Corrections." IEEE Robotics and Automation Letters 6, no. 4 (October 2021): 6820–27. http://dx.doi.org/10.1109/lra.2021.3095625.

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14

Paknejad, Ahmad, Gouying Zhao, Michel Osée, Arnaud Deraemaeker, Frédéric Robert, and Christophe Collette. "A novel design of positive position feedback controller based on maximum damping and H2 optimization." Journal of Vibration and Control 26, no. 15-16 (January 9, 2020): 1155–64. http://dx.doi.org/10.1177/1077546319892755.

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Positive position feedback is an attractive control law for the control of plants having no high frequency roll-off. The tuning of the parameters of the positive position feedback to obtain the desired closed-loop performance is quite challenging. This paper presents a technique to design the positive position feedback controller with the optimal damping. The technique is demonstrated on a single degree-of-freedom system. The poles of the positive position feedback are tuned using the method of maximum damping, which states that the maximum damping is achieved when both closed-loop poles of the system are merged. The parameters of the positive position feedback are dependent on the desired target damping in the closed-loop system. However, arbitrary choice of target damping results in high response at the frequencies lower than the tuning frequency. The optimal value of the target damping is obtained by minimizing the [Formula: see text] norm of the closed-loop transfer function of the system. The influence of the various parameters of the positive position feedback on the closed-loop response of the system is also studied. Finally, the experiments are conducted to verify the effectiveness of the proposed technique.

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15

Kim, Seok-Kyoon. "Nonlinear Position Stabilizing Control with Active Damping Injection Technique for Magnetic Levitation Systems." Electronics 8, no. 2 (February 17, 2019): 221. http://dx.doi.org/10.3390/electronics8020221.

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This proposal suggests a novel nonlinear position-stabilizing controller for magnetic levitation (MAGLEV) applications. The proposed scheme is devised by combining the active damping injection technique and disturbance observers (DOBs), considering the inherent nonlinear dynamics, as well as parameter and load variations. The convergence and performance recovery properties are obtained by analyzing the closed-loop dynamics, which is the main contribution. The numerical verification confirms a considerable closed-loop robustness improvement, compared with the cascade-type feedback-linearization controller.

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16

Perrusquía, Adolfo, Wen Yu, and Alberto Soria. "Position/force control of robot manipulators using reinforcement learning." Industrial Robot: the international journal of robotics research and application 46, no. 2 (March 18, 2019): 267–80. http://dx.doi.org/10.1108/ir-10-2018-0209.

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Purpose The position/force control of the robot needs the parameters of the impedance model and generates the desired position from the contact force in the environment. When the environment is unknown, learning algorithms are needed to estimate both the desired force and the parameters of the impedance model. Design/methodology/approach In this paper, the authors use reinforcement learning to learn only the desired force, then they use proportional-integral-derivative admittance control to generate the desired position. The results of the experiment are presented to verify their approach. Findings The position error is minimized without knowing the environment or the impedance parameters. Another advantage of this simplified position/force control is that the transformation of the Cartesian space to the joint space by inverse kinematics is avoided by the feedback control mechanism. The stability of the closed-loop system is proven. Originality/value The position error is minimized without knowing the environment or the impedance parameters. The stability of the closed-loop system is proven.

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17

Zeng, Meng Xiong, and Wen Ouyang. "CNC Servo System Base on PMSM." Applied Mechanics and Materials 331 (July 2013): 267–70. http://dx.doi.org/10.4028/www.scientific.net/amm.331.267.

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The paper study object is the CNC servo system, and it presented three closed-loops control strategy based on PMSM. Through dynamic mathematical model of current loop, rotational speed loop and position loop were established and simplified. The closed-loop regulator was designed. The system was corrected by the controller. The simulation, tuning and calculation of the closed-loop were carried in MATLAB/SIMULINK. The results indicated that the system design was correct, and the desired effect of control was achieved.

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18

Zhang, Chun You, and Cong Rui Wang. "The Study of Hydraulic Valve Position Control Based on PLC Controller." Applied Mechanics and Materials 651-653 (September 2014): 928–31. http://dx.doi.org/10.4028/www.scientific.net/amm.651-653.928.

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With the growing shortage of water today, in order to control the flow of pipe conveyance, it is essential for further study of automatic control valves, especially the automatic control technology of control valve. In this paper, by using programmable control and signal transmission technologies etc. a prototype model of hydraulic valve position control is constructed. Prototype model is designed as the closed-loop of position control system, by using high-precision angular displacement sensor detecting the position of the valve plate, converting the output signal of sensor into an industrial process signal 4-20mA with the low-drift transmitter chip XTR101, and with modular PLC as system control center, using three-phase inverter controlling the steering and speed of motor and cooperating with closed pump control system for hydraulic drive, it achieves the closed-loop control hydraulic valve position. This paper provides some technical support for the better use of water resources.

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19

Lu, Hua Cai, Ming Jiang, Qi Gong Chen, and Li Sheng Wei. "Sensorless Position Control of Surface Permanent Magnet Linear Synchronous Motors." Applied Mechanics and Materials 88-89 (August 2011): 165–69. http://dx.doi.org/10.4028/www.scientific.net/amm.88-89.165.

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In this paper, a novel sensorless position control for a surface permanent magnet linear synchronous motor (SPMLSM) is presented. The position and speed of the SPMLSM drive is obtained through a closed loop observer by only measuring phase voltages and currents. Estimation of speed is done using difference between estimates of the current derivatives in the dq frame, which calculated two different ways: first using a high-gain observer, and then using the motor model. Estimation of the mover position is done through integrating the estimation of speed. The proposed scheme works in a closed loop fashion. It enhances the allowable initial position error; can be used without any physical modification; does not rely on motor saliency and requires no knowledge of the load. Results from numerical simulations and practical implementation are presented to validate the proposed schemes.

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20

Dian, Song Yi, and Guo Fei Xiang. "Control for Multi-DOF Micro-Order Planar Motion Stage Based on Sliding Mode Observer." Key Engineering Materials 609-610 (April 2014): 1201–6. http://dx.doi.org/10.4028/www.scientific.net/kem.609-610.1201.

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In this paper, a novel partial sensorless control (PSC) has been tailored to multi-DOF precision positioning issue for Sawyer motor-based planar motion stage. For the position estimation, a Sliding Mode Observer based technique has been implemented. We investigate the positioning performance on open-loop, closed-loop and PSC by experiments. The results of experiments have verified that PSC is an available way to maintain travel range and reduce the cost for precise position sensing while without so much sacrifice on positioning accuracy comparing with closed-loop control in all-axis for the stage.

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21

Chen, Dong, and De Gong Chang. "Study on Universal Open-Architecture CNC Development Platform Based on Clipper." Advanced Materials Research 500 (April 2012): 429–33. http://dx.doi.org/10.4028/www.scientific.net/amr.500.429.

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An universal open-architecture CNC development platform for further designing all kind of numerical control devices is study, which is beneficial to making considerable reduction of development cycle and cost. The platform adopts IPC+Clipper construction to achieve the open-architecture of hardware, adopts modular programming technique to implement the open software according to user requirement. The control system consists of closed outer position loop and closed inner speed loop.As a result, the combination of position loop and speed loop achieve high precise and good stability of the motion control.

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22

Zhu, Qi, Yan Wu, and Yu An He. "Research and Develop of Tube Catching Manipulator Control System Based on DMC." Applied Mechanics and Materials 623 (August 2014): 182–86. http://dx.doi.org/10.4028/www.scientific.net/amm.623.182.

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This paper introduces the tube catching manipulator control system based on DMC, elaborating hardware and software of the whole control system, applying the PID algorithm and closed-loop feedback, putting forward a control system combined increment PID controller and double closed-loop compensation. It makes the manipulator position more accurately and run more stably.

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23

Wang, Li Hong, and Yue Ling Zhao. "Design of Stepping Motor Position Closed Loop Control System Based on PLC." Applied Mechanics and Materials 127 (October 2011): 126–29. http://dx.doi.org/10.4028/www.scientific.net/amm.127.126.

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A stepping motor position closed loop control system was designed, which adopts displacement sensor to examine the position of the load. The system’s hardware constitute was given here, and the pulse control project was given at the same time. It uses the high-speed pulse output of PLC to export the adjustable frequency pulse. The adjustment of the frequency based on the error of initial value and actual value. On one hand, it can realize fast and accurate position control. On the other hand, it can overcome the weakness of losing step. Thus makes the system have better control function.

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24

Li, Deng Hua, Zhan Xian Chen, and Shuang Zhai. "Double Closed-Loop Controller Design of Brushless DC Torque Motor Based on RBF Neural Network." Advanced Materials Research 503-504 (April 2012): 1351–56. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.1351.

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For the problem of that the traditional brushless DC torque motor controller position servo system is difficult to track accurately the complex and varied location information, an improved double closed-loop controller is designed in this paper. A self-adaptive PID algorithm based on RBF neural network is employed to design position loop controller and a feed-forward control algorithm is used in the speed loop controller. The improved double closed-loop controller validated the feasibility of the new method for the design of brushless DC torque motor position servo system

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25

Housny, Halima, El Ayachi Chater, and Hassan El Fadil. "Multi Closed-loop Adaptive Neuro-Fuzzy Inference System for Quadrotor Position Control." Advances in Science, Technology and Engineering Systems Journal 5, no. 5 (2020): 526–35. http://dx.doi.org/10.25046/aj050565.

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26

Moradi, M., and M. Naraghi. "Optimal balancing of slider-crank servomechanism: closed-loop optimal position control approach." International Journal of Mechanisms and Robotic Systems 3, no. 1 (2016): 1. http://dx.doi.org/10.1504/ijmrs.2016.077034.

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27

O'Donoghue, Kilian, David Eustace, James Griffiths, Michael O'Shea, Timothy Power, Hilary Mansfield, and Padraig Cantillon-Murphy. "Catheter Position Tracking System Using Planar Magnetics and Closed Loop Current Control." IEEE Transactions on Magnetics 50, no. 7 (July 2014): 1–9. http://dx.doi.org/10.1109/tmag.2014.2304271.

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28

Ansari, Uzair, and Abdulrahman H. Bajodah. "Robust generalized dynamic inversion based control of autonomous underwater vehicles." Proceedings of the Institution of Mechanical Engineers, Part M: Journal of Engineering for the Maritime Environment 232, no. 4 (May 27, 2017): 434–47. http://dx.doi.org/10.1177/1475090217708640.

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A novel two-loop structured robust generalized dynamic inversion–based control system is proposed for autonomous underwater vehicles. The outer (position) loop of the generalized dynamic inversion control system utilizes proportional-derivative control of the autonomous underwater vehicle’s inertial position errors from the desired inertial position trajectories, and it provides the reference yaw and pitch attitude angle commands to the inner loop. The inner (attitude) loop utilizes generalized dynamic inversion control of a prescribed asymptotically stable dynamics of the attitude angle errors from their reference values, and it provides the required control surface deflections such that the desired inertial position trajectories of the vehicle are tracked. The dynamic inversion singularity is avoided by augmenting a dynamic scaling factor within the Moore–Penrose generalized inverse in the particular part of the generalized dynamic inversion control law. The involved null control vector in the auxiliary part of the generalized dynamic inversion control law is constructed to be linear in the pitch and yaw angular velocities, and the proportionality gain matrix is designed to guarantee global closed-loop asymptotic stability of the vehicle’s angular velocity dynamics. An additional sliding mode control element is included in the particular part of the generalized dynamic inversion control system, and it works to robustify the closed-loop system against tracking performance deterioration due to generalized inversion scaling, such that semi-global practically stable attitude tracking is guaranteed. A detailed six degrees-of-freedom mathematical model of the Monterey Bay Aquarium Research Institute autonomous underwater vehicle is used to evaluate the control system design, and numerical simulations are conducted to demonstrate closed-loop system performance under various types of autonomous underwater vehicle maneuvers, under both nominal and perturbed autonomous underwater vehicle system’s mathematical model parameters.

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29

GASKETT, CHRIS, ALEŠ UDE, and GORDON CHENG. "HAND–EYE COORDINATION THROUGH ENDPOINT CLOSED-LOOP AND LEARNED ENDPOINT OPEN-LOOP VISUAL SERVO CONTROL." International Journal of Humanoid Robotics 02, no. 02 (June 2005): 203–24. http://dx.doi.org/10.1142/s0219843605000430.

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We propose a hand-eye coordination system for a humanoid robot that supports bimanual reaching. The system combines endpoint closed-loop and open-loop visual servo control. The closed-loop component moves the eyes, head, arms, and torso, based on the position of the target and the robot's hands, as seen by the robot's head-mounted cameras. The open-loop component uses a motor-motor mapping that is learnt online to support movement when visual cues are not available.

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30

Min, Yong Lin, Xiao Yang Chen, Chi Chen, and Chuan Ping Hu. "Simulation of Closed-Loop Control of the Landing Position of the Water Jet out from Water Fire Monitors." Advanced Materials Research 139-141 (October 2010): 1902–5. http://dx.doi.org/10.4028/www.scientific.net/amr.139-141.1902.

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Ordinarily, water fire monitor extinguishing systems are applied to protect large space places from fire. To intellectualize them and improve the water usability and extinguishing efficiency, it is necessary to realize the closed-loop control of the landing position of the water jet out from the monitors in order to let the water jet reach the fire point as fast as possible. According to the characteristics of the adjusting mechanism of fire monitors, combing with the new theoretical model for their water jet track, the closed-loop control procedure is simulated. The results show that the water jet can reach the ignition point after only several adjustments. The effective control procedure simulation paves a sound basis for the closed-loop control of the landing position of the water jet out from water fire monitors.

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31

Liu, Rui Yi, and Jun Huang. "The Application of System Parameters in Eliminating Oscillation and Improving Machining Accuracy of CNC Machine Tool." Applied Mechanics and Materials 268-270 (December 2012): 1523–26. http://dx.doi.org/10.4028/www.scientific.net/amm.268-270.1523.

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The measures of eliminating system oscillation by using parameters were put forward in semi-closed loop and closed loop control. The setup procedures of parameters were introduced, which included position loop gain, bi-position feedback, mechanical speed feedback. The setting of the parameters such as acceleration of backlash, compensation for static friction, feed forward and look-ahead feed forward of servo were also proposed, for purpose of improving the position accuracy and interpolation accuracy. The application of the system parameters is significant for improving the machining accuracy and ability of CNC machine tools.

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32

Ma, Siyuan, Xiang Yu, Yunjun Guo, and Rong Ran. "The sensorless control strategy of UAV rotor motor in full speed range." E3S Web of Conferences 261 (2021): 01010. http://dx.doi.org/10.1051/e3sconf/202126101010.

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UAV (Unmanned Aerial Vehicle) has broad application prospects in various fields. In order to meet the needs of stability and efficiency during flight, a surface-mounted permanent magnet synchronous motor is used as its rotor motor, and a position sensorless control technology is used to control the rotor motor with high efficiency and high dynamic response. This paper proposes a position sensorless control strategy in the full speed range for the actual application requirements of UAV. In low speed ange, I/F control strategy with speed-open-loop and current-closed-loop is. In medium and high speed range, a sliding mode observer is adopted to provide estimated rotor position and speed. To achieve smooth switching from I/F control stage to speed closed-loop stage, a switching algorithm is proposed. The feasibility of the proposed hybrid control strategy is verified by simulation results.

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33

Alter, D. M., and Tsu-Chin Tsao. "Control of Linear Motors for Machine Tool Feed Drives: Design and Implementation of H∞ Optimal Feedback Control." Journal of Dynamic Systems, Measurement, and Control 118, no. 4 (December 1, 1996): 649–56. http://dx.doi.org/10.1115/1.2802339.

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Direct drive linear motors have good potential for use as next generation machine tool feed drives since they can increase machining rates and improve servo accuracy by eliminating gear related mechanical problems. To exploit the high speed and high response direct drives for machining, the servo control must achieve as high as possible tracking performance while at the same time establishing as much as possible the dynamic stiffness in order to maintain machining stability and reduce the effect of machining disturbance forces on the tool position. This paper investigates the use of optimal H∞ control to design for large stiffness and closed-loop tracking performance. Position feedback alone is first considered, with cutting force feedback later added to augment closed loop stiffness. Optimal position feedback is experimentally seen to achieve up to a 46 percent stiffness improvement over that achievable with proportional-derivative control. The addition of force feedback to the servo-loop resulted in a further 70 to 100 percent stiffness improvement over the position feedback alone values.

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34

Soleymanzadeh, Davood, Hamed Ghafarirad, and Mohammad Zareinejad. "Sensorless adaptive sliding mode position control for piezoelectric actuators with charge leakage." Journal of Intelligent Material Systems and Structures 31, no. 1 (October 10, 2019): 40–52. http://dx.doi.org/10.1177/1045389x19880009.

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Position control of piezoelectric actuators is greatly affected by nonlinearities such as hysteresis and creep. Therefore, precise position sensors must be utilized which have high cost and complicated structures in micro scales. Charge-based position estimation is an alternative method which resorts to piezoelectric linear charge-position property to estimate the actuator position, but in low-impedance actuators, there is a charge leakage caused by actuator internal resistance which deteriorates the position estimation and closed-loop control performance. In this article, the leakage is considered as a sensor fault. Therefore, a combination of charge measurement method and an appropriate observer is designed to detect and isolate the mentioned fault and estimate the actuator position properly. In addition, an adaptive sliding mode control procedure is proposed for trajectory tracking in the presence of estimated states. The required analysis is carried out to guarantee the closed-loop stability. Finally, experimental results show the effectiveness of the proposed method.

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35

Lee, Kyeong Ha, Seung Guk Baek, Hyouk Ryeol Choi, Hyungpil Moon, Sang-Hoon Ji, and Ja Choon Koo. "Feedforward model-inverse position control of three-stage servo-valve using zero magnitude error tracking control." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 233, no. 7 (July 5, 2018): 2340–48. http://dx.doi.org/10.1177/0954406218786533.

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Three-stage servo-valves are popularly used in hydraulic systems that require large flow rate and high pressure. For a proper control of flow direction and flow rate fed into a hydraulic actuator, securing a proper position control bandwidth is a critical task for the servo-valve. In this paper, a set of popular control methods are systematically studied and a control method is selected. It is proven that the feedforward model-inverse control is the most effective method in terms of the control bandwidth. In the present work, the feedforward closed-loop architecture is adopted and the closed-loop system is estimated in a linear discrete-time transfer function by recursive least squares method. On recognizing a nonminimum phase zero problem, this work implements the zero magnitude error tracking control, an approximate model-inverse technique, in order to overcome the problem. As a result, the effectiveness of the proposed feedforward model-inverse position control strategy is verified.

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36

Sun, Wen Quan, Quan Yang, An Rui He, and Xin Yu Guo. "Research of the Strategy on the Flatness and Gauge Control Based on Coiling Variable Tension Control Process." Advanced Materials Research 572 (October 2012): 98–103. http://dx.doi.org/10.4028/www.scientific.net/amr.572.98.

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Based on the analysis and simulation of the variable tension coiling process, integrated control strategy for strip flatness, thickness and tension has been proposed when the last stand adopts the control means of both position closed loop and pressure closed loop. The strategy pre-controls strip flatness and thickness according to the changing tension to decrease accommodation amplitude and enhance product quality. Practical application shows the strategy improves the control precision on the basis of ensuring the stable operation of unit.

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37

Zhao, Ji Yun, Hai Gang Ding, and Liang Zhao. "Research on Electrohydraulic Servo Proportional Speed Regulation System for Anti-Explosion Hydraulic Hoisters." Applied Mechanics and Materials 34-35 (October 2010): 1205–10. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.1205.

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In terms of poor controllability of motor speed, the drum speed of the anti-explosion hydraulic hoister is fed back and controlled in closed loop. An electrohydraulic servoproportional speed regulation systems for anti-explosion hydraulic hoisters is proposed. Two control constructions are formed, the pump controlled motor system with/without position loop (PCMWP, PCMP, resp.) according to whether the displacement of pump is controlled in closed loop or not. Experiments of two control constructions are made under overflow load and weight load. Experimental results indicate that the presented system can simulate the process of anti-explosion hydraulic hoisters, and closed control loop could promote the control performance of hoister. Compared to the PCMP, the PCMWP is characterized by more stability with better speed follow and better robustness. At the same time, the cage instantaneous sliding at start-up and the pressure shock while braking are avoided effectively relying on the cooperation between the driving system and brake system, which ensure the security for hydraulic hoisters; the method of position correction by using travel switches at the end greatly enhances the precision of parking position.

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38

Bobrow, J. E., and F. Jabbari. "Adaptive Pneumatic Force Actuation and Position Control." Journal of Dynamic Systems, Measurement, and Control 113, no. 2 (June 1, 1991): 267–72. http://dx.doi.org/10.1115/1.2896374.

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In this paper an implementation of an adaptive control law for a pneumatic actuator is presented. Pneumatic actuators are of particular interest for robotic applications because of their large force output per unit weight, and their low cost. Stabilization of a pneumatic actuator is difficult if a high bandwidth closed-loop system is desired. This is because of the compressibility of air, and of the nonlinear characteristics of air flowing through a variable area orifice. Further complications arise from the geometry of the mechanism because the equations of motion are highly nonlinear. The order of the dominant dynamics is shown to vary with the position of the mechanicsm.

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Tang, Xintian, Kai Li, Weishan Chen, Dong Zhou, Shenghui Liu, Jianguo Zhao, and Yingxiang Liu. "Temperature self-sensing and closed-loop position control of twisted and coiled actuator." Sensors and Actuators A: Physical 285 (January 2019): 319–28. http://dx.doi.org/10.1016/j.sna.2018.11.040.

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40

Xudong, Zhang, Chen Wuzhu, Jiang Ping, Liu Chun, and Guo Jing. "Double closed-loop control of the focal point position in laser beam welding." Measurement Science and Technology 14, no. 11 (September 19, 2003): 1938–43. http://dx.doi.org/10.1088/0957-0233/14/11/011.

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Fischer, Gregory S. "Enabling Closed-Loop Surgery in MRI." Mechanical Engineering 137, no. 09 (September 1, 2015): S11—S14. http://dx.doi.org/10.1115/1.2015-sep-8.

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This article demonstrates on the use of closed-loop surgery methods in magnetic resonance imaging (MRI). MRI is a highly effective soft tissue imaging system, and the ability to utilize this procedure in-vivo coupled with precision computer controlled motion will prove to be an invaluable asset in the future development of minimally invasive surgery. Robotic assistance has been investigated for guiding instrument placement in MRI, beginning with neurosurgery and later percutaneous interventions with some examples shown in the paper. In order for a system to compatible with the MRI environment, it should: be safe in the MRI environment, preserve the image quality, and be able to operate unaffected by the scanner’s electric and magnetic fields. Closed loop control requires multiple levels of feedback. Optical encoders have proven to be successful for position sensing inside the scanner bore during imaging when coupled with differential line drivers, filtering appropriate electrical lines, and thoroughly shielding cables to minimize electromagnetic interference (EMI).

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42

Lan, Tian, Qiu Shi Han, Bao Ying Peng, and Shi Wei Hu. "Composite Grinding Machine Asynchronous Electric Spindle Direct Torque Closed-Loop Servo Control Research." Advanced Materials Research 650 (January 2013): 476–81. http://dx.doi.org/10.4028/www.scientific.net/amr.650.476.

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Composite grinding machine for non-circular shaft parts, on the workpiece servo spindle high requirements.In order to overcome the vector control coordinate calculation of complex, slow response speed and other defects, this paper adopts the direct torque control scheme of asynchronous motor spindle servo control research.Using the Matlab/Simulink module library provides the basic module, built asynchronous electric spindle direct torque control system model.Coordinate transformation process were established, flux adjust step, flux observation, link and loop PID position control module, and the use of subsystem package technology package.The current loop, speed loop, ring in position and torque simulation test, the results show that, the method of direct torque control of asynchronous motor spindle control drive control system can obtain good static and dynamic response characteristics and the closed-loop response performance.

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Qiu, Cong, Wang Yong He, and Bo Tian. "Design of Single-Axis Control System Based on FM354." Advanced Materials Research 926-930 (May 2014): 1289–92. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.1289.

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AC servo system has been widely used in many fields with its high performance and the fast development of intelligent control strategy. Targeted at the single-axis motion control applications in industrial automation, a kind of single-axis motion control system, based on FM354 controlled by S7-300 PLC, is designed. The system consists of three to the position, speed and current closed-loop control to achieve precise position control. The position loop is implemented by FM354. The speed loop and current loop are encapsulated in the servo driver. Through monitoring and comparing the dynamic performance with traditional systems, it can find out the bench runs smoothly and positioning accurately, perfectly meeting the technological and application requirements. It also can be applied to a variety of occasions and used for multi-axis extension.

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Dankadai, Najib K., Ahmad Athif Mohd Faudzi, Amir Bature, Suleiman Babani, and Muhammad I. Faruk. "Position Control of a 2D Nonlinear Gantry Crane System Using Model Predictive Controller." Applied Mechanics and Materials 735 (February 2015): 282–88. http://dx.doi.org/10.4028/www.scientific.net/amm.735.282.

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This paper presents the application of model predictive controller for controlling a nonlinear 2D gantry crane system with a DC motor as an actuator. The gantry crane system (GCS) dynamics is derived using Lagrange equation method. A model predictive controller is designed based on the linearised GCS and prediction cost function to ensure accurate positioning and oscillation reduction. Simulation via MATLAB and Simulink was performed to investigate the performance of the model predictive controller on the GCS. The controller test was done under several elements altering the behaviour of the system. The closed loop system was analysed considering different cable length, payload mass and trolley position. It was found that the closed loop control meets the main goal of this work, trolley positioning as fast as possible with minimum payload swinging all within a robust input voltage.

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45

Pshikhopov, Viacheslav, Mikhail Medvedev, Victor Krukhmalev, and Victor Shevchenko. "Base Algorithms of the Direct Adaptive Position-Path Control for Mobile Objects Positioning." Applied Mechanics and Materials 763 (May 2015): 110–19. http://dx.doi.org/10.4028/www.scientific.net/amm.763.110.

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Problem of a mobile object positioning in the presence of determinate disturbances is considered in this paper. A mobile object is described by kinematics and dynamics equations of a solid body in three dimensional space. The control inputs of the mobile object are forces and torques. Design of adaptive control is based on position-path control method for mobile objects. In this article two algorithms of the adaptive position-path control are developed. The first algorithm is adaptive position-path control with integration component and a reference model. The second algorithm is adaptive position-path control with a reference model and an extended mobile robot model. Block diagram of the direct adaptive position-path control system with a reference model is suggested. Design procedures of the adaptive position-path control systems and stability analysis of the closed-loop systems are presented. Computer simulation results of the designed adaptive closed-loop systems with both constant and variable disturbances are presented. On base of the analysis and modeling results conclusions are provided.

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Vincent, T. L., S. P. Joshi, and Yeong Ching Lin. "Positioning and Active Damping of Spring-Mass Systems." Journal of Dynamic Systems, Measurement, and Control 111, no. 4 (December 1, 1989): 592–99. http://dx.doi.org/10.1115/1.3153099.

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In this paper, we investigate an alternate approach to the design of controllers for positioning and damping of a system which can be reduced to an equivalent system of springs and masses. The approach taken is to design a controller which uses open-loop positioning followed by closed-loop control for damping. By so doing, we can avoid a conflicting requirements problem associated with traditional state variable feedback design. The open-loop portion of the control is based on optimal control theory, which allows for control saturation. In particular, during this phase of the control, the time to position is minimized. This results in a bang-bang type of control. Once the system has been “positioned,” the controller switches to a closed-loop phase. The particular closed-loop control used here is based on energy methods and is not a full state variable feedback design. The method is illustrated using a low-order spring-mass example, and the results are compared with an LQ design.

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Callegari, Massimo, Luca Carbonari, Giacomo Palmieri, Matteo-Claudio Palpacelli, and Donatello Tina. "Position Control of a 3-CPU Spherical Parallel Manipulator." Journal of Control Science and Engineering 2013 (2013): 1–12. http://dx.doi.org/10.1155/2013/136841.

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The paper presents the first experimental results on the control of a prototypal robot designed for the orientation of parts or tools. The innovative machine is a spherical parallel manipulator actuated by 3 linear motors; several position control schemes have been tested and compared with the final aim of designing an interaction controller. The relative simplicity of machine kinematics allowed to test algorithms requiring the closed-loop evaluation of both inverse and direct kinematics; the compensation of gravitational terms has been experimented as well.

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48

Gupta, Sharad. "Speed and Position Control of DC Motor using LabVIEW." International Journal for Research in Applied Science and Engineering Technology 9, no. VIII (August 10, 2021): 111–16. http://dx.doi.org/10.22214/ijraset.2021.37286.

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New applications requiring both speed and position control have emerged as a result of technological advancements. In many applications, a DC motor's speed and position can be adjusted. The PID controller controls the speed and position of individually stimulated DC motors. Using LabVIEW software, this study attempts to control the speed and position of a DC motor as well as calculate the closed loop system model. Nonlinearity in any system has undesirable implications in normal operation. Unwanted outcomes including dead zones, saturation, and system reaction.

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Watton, J. "A Digital Compensator Design for Electrohydraulic Single-Rod Cylinder Position Control Systems." Journal of Dynamic Systems, Measurement, and Control 112, no. 3 (September 1, 1990): 403–9. http://dx.doi.org/10.1115/1.2896157.

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A digital compensator using a forward algorithm, F(z−1), and a feedback algorithm, H(z−1), is developed for an electrohydraulic position control system incorporating an underlapped servovalve and a single-rod cylinder. The main problems encountered with designing such a closed-loop system are discussed, and it is shown how the filter coefficients may be easily determined for a particular class of open-loop transfer function. An excellent comparison between theory and experiment is obtained and it is deduced that one coefficient only need be changed in the forward algorithm for such gain-change dominant systems.

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50

Shaffer, P. L. "Distributed Control System for Turbine Engines." Journal of Engineering for Gas Turbines and Power 121, no. 1 (January 1, 1999): 102–7. http://dx.doi.org/10.1115/1.2816295.

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A distributed control system (DCS) for a turbine engine has been demonstrated and tested, consisting of prototype electronic interface units (EIUs) connected to data and power busses. In the DCS, a central control computer communicated with smart sensors and smart actuators via a 2.5 megabit/sec digital data bus, using the Fields protocol. Power was distributed to the smart devices as 100 kHz 100V peak AC, allowing light, simple power converters at each smart device. All smart sensors, smart actuators, and cables were dual redundant. The smart actuators received position demand from the central control computer, exchanged data between channels to provide local redundancy management, closed the position loop locally, and reported actuator position to the central controller. Smart sensors converted sensed signals to digital values in engineering units, and performed local built-in tests. Testing of the DCS was done in a closed-loop simulation with an engine model. Frequency response of the DCS was almost identical with the conventional system.

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