Full-Closed Loop Servo Control System of Gear Measuring Centre

2015 ◽  
Author(s):  
Chen Hai Yan ◽  
Jin Hui Hui
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Servo Control ◽  
Servo Control System

A servo-control system for open- and closed-loop blood pressure regulation

1992 ◽  
Vol 262 (2) ◽  
pp. F320-F325 ◽  
Author(s):  
B. Nafz ◽  
P. B. Persson ◽  
H. Ehmke ◽  
H. R. Kirchheim
Keyword(s):  
Blood Pressure ◽  
Control System ◽  
Arterial Pressure ◽  
Closed Loop ◽  
Dynamic Pressure ◽  
Servo Control ◽  
Feedback Systems ◽  
Set Point ◽  
Arterial Blood ◽  
Servo Control System

An electropneumatic servo-control system is described that can reduce and control arterial blood pressure in experimental animals. The device has been proved useful in the analysis of pressure-dependent physiological processes and allows the following two modes of operation: 1) a conventional open-loop setting that will reduce arterial pressure to a preselected set point and 2) a closed-loop mode that enables an adjustment to a dynamic pressure set point (i.e., the controlled pressure is reduced to a constant value below a reference pressure). A pneumatic servo-control mechanism was chosen to provide minimal control latency. The accuracy of the system under physiological conditions is well within +/- 1 mmHg. The device can be useful in a number of studies demanding a precise regulation of local arterial pressure, such as experiments on blood flow autoregulation, arterial baroreceptor reflexes, and all experiments involving the study of pressure-dependent excretory and incretory functions of the kidney. The closed-loop setting is useful for studying physiological feedback systems.

Study on High Precision Control Scheme of Ceramic Ferrule Concentricity Grinder

2014 ◽  
Vol 635-637 ◽  
pp. 1266-1270 ◽  
Author(s):  
Yan Jin ◽  
Hui Lin
Keyword(s):  
Control System ◽  
Real Time ◽  
High Speed ◽  
Closed Loop ◽  
Servo Control ◽  
Precision Machining ◽  
Precision Control ◽  
Servo Control System ◽  
Electric Control ◽  
Control Scheme

The paper analyzes the precision coaxial processing requirements and the characteristics of high automatic online compensation, and builds the electric control system based on Delta series products. The system uses a bus controller and absolute encoders servo constitute nearly closed-loop servo control system, combined with torque limiting grading feeding, dressing real-time compensation, stable and high-speed precision machining ceramic ferrule.

A Servo Control System Based on Fuzzy PI Method for Transverse Flux Machine in Mechanical Press

2014 ◽  
Vol 936 ◽  
pp. 1730-1734
Author(s):  
Jia Xie ◽  
Ai Lin Gao ◽  
Yan Xiang Wu ◽  
Zhong Yong Gao
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Control Method ◽  
Servo Control ◽  
Pi Control ◽  
Speed Controller ◽  
Servo Control System ◽  
Mechanical Press ◽  
Transverse Flux ◽  
Fuzzy Adaptive

A control method for servo control system of Assembled Claw Pole Stator Transverse Flux Machine(ACPTFM) by controlling the armature current Root-Mean-Square (RMS) and the angle between armature current and no-load EMF is proposed in this paper. The servo control system of ACPTFM is composed of a series of closed-loop controllers, and the most complexity design of speed controller is described in detail. Fuzzy adaptive PI control method which integrates the advantages of fuzzy control and PI control is adopted to design the speed controller. Experimental results show that it can improve the system dynamic response and steady state accuracy.

scholarly journals Research of the Photoelectric Tracking and Pointing Platform Based on the Servo Control System

2019 ◽  
Author(s):  
Liu Shanzhong ◽  
Han Pengna
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Tracking Error ◽  
Video Tracking ◽  
Servo Control ◽  
Linear Matrix ◽  
Tracking Accuracy ◽  
Servo Control System ◽  
Attitude Tracking ◽  
The Stability

To improve the speed and accuracy of the photoelectric tracking and pointing platform stable tracking, we took the three-axis photoelectric tracking platform, of which the coupling among the rings is ignored, as the research object. Considering the effects of various disturbances, the stable tracking double closed-loop servo control system was built for the azimuth, pitch, and roll rings. In the stabilization loop, output-feedback H∞ controller based on linear matrix inequality was designed to reduce the effects of model perturbations and uncertainties and to maintain the stability of the platform’s inertial space. In the tracking loop, the integral-separation proportional integral derivative (PID) controller was designed to achieve fast and accurate tracking. Smith estimated compensation was adopted to compensate the pure lag caused by video tracking. Finally, the double closed-loop servo control system was built to complete the simulation. The simulation results show that the system not only has good robustness under external disturbances, but also completes the attitude tracking quickly and accurately. Besides, the tracking error is |error| < 5∙e-4 rad, which meets the tracking accuracy requirements.

A Research of Image-Based Visual Control in Microassembly under a Microscope

2006 ◽  
Vol 315-316 ◽  
pp. 809-812
Author(s):  
Shi Jie Tian ◽  
B. Li ◽  
Zhuang De Jiang ◽  
Jun Jie Guo ◽  
H.Y. Zhao
Keyword(s):  
Control System ◽  
Control Algorithm ◽  
Closed Loop ◽  
High Reliability ◽  
Visual Control ◽  
Servo Control ◽  
Robot Kinematics ◽  
Visual Servo ◽  
Visual Servo Control ◽  
Servo Control System

A new visual servo control system under microscope was introduced based on the research of image-based computer visual control system, including the installation and calibration of camera, deduction of the image Jacobian and the algorithm of controlling and so on. The experiments of motion controlling and positioning showed that one pixel about 2.97μm can be reached easily in single axes under 5× eyepiece and under the same condition a 400μm micro shaft was assembled into a micro-gear with 415μm inner bore. Knowing from the control algorithm, the accuracy of the system is independent on errors in the robot kinematics or the camera calibration. The research results indicate that this method is a full closed-loop visual servo control system with a high reliability and simple control algorithm and it can be used in microassembly system.

scholarly journals Performance Improvement of Servo Control System Driven by Novel PMSM-DTC Based On Fixed Sector Division Criterion

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2154 ◽  
Author(s):  
Dazhi Wang ◽  
Tianqing Yuan ◽  
Xingyu Wang ◽  
Xinghua Wang ◽  
Yongliang Ni
Keyword(s):  
Control System ◽  
Performance Improvement ◽  
Error Compensation ◽  
Permanent Magnet Synchronous Motor ◽  
Direct Torque Control ◽  
Torque Control ◽  
Servo Control ◽  
Flux Linkage ◽  
Servo Control System ◽  
Stator Flux

In order to improve the performance of the servo control system driven by a permanent magnet synchronous motor (PMSM) under novel direct torque control (NDTC), which, utilizing composite active vectors, fixed sector division criterion, is proposed in this paper. The precondition of the accurate compensations of torque and flux errors is that the sector where the stator flux linkage is located can be determined accurately. Consequently, the adaptive sector division criterion is adopted in NDTC. However, the computation burden is inevitably increased with the using of the adaptive part. On the other hand, the main errors can be compensated through SV-DTC (DTC-utilizing single active vector), while another active vector applied in NDTC can only supply the auxiliary error compensation. The relationships of the two active vectors’ characteristics in NDTC are analyzed in this paper based on the active factor. Furthermore, the fixed sector division criterion is proposed for NDTC (FS-NDTC), which can classify the complexity of the control system. Additionally, the switching table for the selections of the two active vectors is designed. The effectiveness of the proposed FS-NDTC is verified through the experimental results on a 100-W PMSM drive system.

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