Pneumatic actuation-based bidirectional modules with variable stiffness and closed-loop position control

2021 ◽  
Author(s):  
Yaohui Chen ◽  
Hoam Chung ◽  
Bernard Chen ◽  
Ho Yi Ping ◽  
Yonghang Sun
Keyword(s):  
Closed Loop ◽  
Position Control ◽  
Variable Stiffness ◽  
Pneumatic Actuation

Design of Salt In-Bags Incasing Control Management System Based on Dual Closed-Loop Fuzzy Controller

2014 ◽  
Vol 596 ◽  
pp. 620-624
Author(s):  
Yan Bo Hui ◽  
Yong Gang Wang ◽  
Li Wang ◽  
Qun Feng Niu
Keyword(s):  
Management System ◽  
Closed Loop ◽  
Position Control ◽  
Product Information ◽  
Fuzzy Controller ◽  
High Reliability ◽  
Logistics Management ◽  
High Control ◽  
Control Management System ◽  
Control Management

According to auto-incasing equipment characteristic and control demand, a kind of salt in-bags incasing control management system was designed. The paper introduced the key technologies realization of the system. In the paper, a new fuzzy controller was designed to build a dual closed-loop fuzzy control system, realizing incasing goal site error on-line continuous correction. A logistics management module based on e-Tag was designed to realize product information traceable management. The experimental results show the system realizes accurate position control and RFID logistics management with high reliability and high control precision. The system can be popularized to other products packaging industry.

Feedforward model-inverse position control of three-stage servo-valve using zero magnitude error tracking control

2018 ◽  
Vol 233 (7) ◽  
pp. 2340-2348 ◽  
Author(s):  
Kyeong Ha Lee ◽  
Seung Guk Baek ◽  
Hyouk Ryeol Choi ◽  
Hyungpil Moon ◽  
Sang-Hoon Ji ◽  
...  
Keyword(s):  
Flow Rate ◽  
Tracking Control ◽  
Closed Loop ◽  
Position Control ◽  
Control Method ◽  
Least Squares Method ◽  
Flow Direction ◽  
Recursive Least Squares ◽  
Servo Valve ◽  
Model Inverse

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.

scholarly journals Design of Motion Controller for Satellite-Borne Data Transmission Antenna

2019 ◽  
Vol 2019 ◽  
pp. 1-11
Author(s):  
Lijiao Li ◽  
Ran Shi ◽  
Xiaohui Zhang ◽  
Jiyu Ma ◽  
Jun Zhang
Keyword(s):  
Data Transmission ◽  
Closed Loop ◽  
Position Control ◽  
Motion Controller ◽  
Description Language ◽  
Precision Motion Control ◽  
Zero Position ◽  
Simulation And Experiment ◽  
Hardware Description ◽  
Precision Motion

In order to realize stable, reliable, and high-precision motion control of the satellite-borne data transmission antenna, a FPGA-based motion controller is designed and achieved. The controller receives commands through the RS-422 asynchronous transmission serial port and performs speed planning autonomously. The controller also performs closed-loop position control with the collected resolver angle and controls two antennas synchronously or independently in a subdivision driving method. The controller is firstly designed using the hardware description language VHDL, simulated in ModelSim software. Then, it is connected to the stepping motors through the LMD18200H bridge chip by using aerospace-grade FPGA, controlling the data transmission antennas to regulate the angle, go to zero-position, or stop rotation. The simulation and experiment results show that the design can control the antennas accurately and stably. The accuracy of angle regulation reaches 0.0085° under the condition of 64 subdivisions and 100 : 1 reduction ratio.

Plans and The Structure of Target Acquisition Behavior

1981 ◽  
Vol 25 (1) ◽  
pp. 571-575
Author(s):  
R. A. Miller ◽  
R. J. Jagacinski ◽  
R. B. Nalavade ◽  
W. W. Johnson
Keyword(s):  
Closed Loop ◽  
Position Control ◽  
Open Loop ◽  
General Strategy ◽  
Velocity Control ◽  
Additional Time ◽  
First Order ◽  
Oscilloscope Screen ◽  
Activity Sequence ◽  
Event Based

Subjects manipulated a position control stick with one hand and a velocity control stick with the other hand in order to capture a moving target displayed on an oscilloscope screen. The two control sticks were additively coupled. In order to understand the coordination of the two control sticks, event-based first-order markov “activity sequence generators” were constructed for individual subjects. These discrete probabilistic structures are closely related to each subject's overall plan or general strategy for the capture task. Striking individual differences and strategic errors in performance were revealed. When combined with additional time-conditioned (open-loop) and error-conditioned (closed-loop) details, the activity sequence generators provide a basis for a hierarchic description of this perceptual-motor skill.

The Study of Closed-Loop Position Control System Based on CNC Processing

2014 ◽  
Vol 941-944 ◽  
pp. 2243-2246
Author(s):  
Xin Zhou
Keyword(s):  
Control System ◽  
Machine Tools ◽  
Closed Loop ◽  
Position Control ◽  
Machining Accuracy ◽  
Closed Loop Control ◽  
Loop Control ◽  
Nc Machine ◽  
Nc Machine Tools ◽  
Position Control System

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.

scholarly journals Conventional and Fuzzy Force Control in Robotised Machining

2013 ◽  
Vol 210 ◽  
pp. 178-185 ◽  
Author(s):  
Zenon Hendzel ◽  
Andrzej Burghardt ◽  
Piotr Gierlak ◽  
Marcin Szuster
Keyword(s):  
Neural Networks ◽  
Artificial Neural Networks ◽  
Force Control ◽  
Closed Loop ◽  
Position Control ◽  
Control Strategies ◽  
Closed Loop System ◽  
Fuzzy Logic Systems ◽  
Complex Control System ◽  
Artificial Neural

This article presents an application of the hybrid position-force control of the robotic manipulator with use of artificial neural networks and fuzzy logic systems in complex control system. The mathematical description of the manipulator and a closed-loop system are presented. In the position control were used the PD controller and artificial neural networks, which compensate nonlinearities of the manipulator. The paper presents mainly the application of various strategies of the force control. The force control strategies using conventional controllers P, PI, PD, PID and fuzzy controllers are presented and discussed. All of the control methods were verified on the real object in order to make a comparison of a control quality.

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