Design and Simulation of the Hydraulic Synchronous Control System of the Upper Roller in Bending Machine

2015 ◽  
Vol 713-715 ◽  
pp. 752-755
Author(s):  
Yang Cao ◽  
Kai Wen Qiu ◽  
Guo Qing Wu ◽  
Rong Chuan Yu ◽  
Chao Chao Zhong
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
System Simulation ◽  
Open Loop ◽  
Closed Loop System ◽  
Synchronous Control ◽  
Pid Algorithm ◽  
Synchronous System ◽  
Hydraulic Cylinders

This paper sketches the overall structure of the hydraulic system of bending machine, and designs the hydraulic synchronous control system of the upper roller in bending machine. Then making use of AMEsim software to establish hydraulic system simulation model to analyze the pressure, velocity, displacement and other parameters of hydraulic cylinders in two cases when in open loop and closed loop system. After that, use PID algorithm to simulate the upper roller of bending machine in hydraulic closed loop synchronous system, which verifies that it can meet the motion requirements and get a higher synchronous precision.

Control System Synthesis Based on Plant Test Data

1995 ◽  
Vol 117 (4) ◽  
pp. 484-489
Author(s):  
Jenq-Tzong H. Chan
Keyword(s):  
Control System ◽  
Test Data ◽  
Closed Loop ◽  
Explicit Knowledge ◽  
Linear Time ◽  
Open Loop ◽  
Loop System ◽  
Closed Loop System ◽  
System Synthesis ◽  
Control System Synthesis

A correlation equation is established between open-loop test data and the desired closed-loop system characteristics permitting control system synthesis to be done on the basis of a numerical approach using experimental data. The method is applicable when the system is linear-time-invariant and open-loop stable. The major merits of the algorithm are two-fold: 1) Arbitrary placement of the closed-loop system equation is possible, and 2) explicit knowledge of an open-loop system model is not needed for the controller synthesis.

A Biological Feedback Control System with Electronic Input: The Artificially Closed Femur-Tibia Control System of Stick Insects

1986 ◽  
Vol 120 (1) ◽  
pp. 369-385 ◽  
Author(s):  
G. WEILAND ◽  
U. BÄSSLER ◽  
M. BRUNNER
Keyword(s):  
Control System ◽  
Feedback Control ◽  
Closed Loop ◽  
Stick Insect ◽  
Open Loop ◽  
Loop System ◽  
Chordotonal Organ ◽  
Closed Loop System ◽  
Open Loop System ◽  
Stick Insects

An experimental arrangement was constructed which is based on the open-loop femur-tibia control system of two stick insect species (Carausius morosus and Cuniculina impigra). It could be artificially closed in the following way: the position of the tibia was measured by an optical device and this value was used to drive a penmotor which moved the receptor apodeme of the femoral chordotonal organ in the same way as in intact animals. This arrangement allows direct comparison of the behaviour of the open-loop and the closed-loop system as well as introducing an additional delay. The Carausius system has a phase reserve of only 30°-50° and the factor of feedback control approaches 1 between 1 and 2 Hz. This agrees with the observation that an additional delay of 70–200 ms produces long-lasting oscillations of 1–2 Hz. The Cuniculina system has a larger phase reserve and consequently a delay of 200 ms produced no oscillations. All experiments show that extrapolation from the open-loop system to the closed-loop system is valid, despite the non-linear characteristics of the loop. Consequences for servo-mechanisms during walking and rocking movements are discussed.

Generic Design Methodology for Electro-Hydraulic Servo Actuator in Aero-Engine Main Fuel Control System

2014 ◽  
Author(s):  
Huawei Wang ◽  
Xi Wang ◽  
Wei Dang ◽  
Huating Yao ◽  
Bin Wang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Design Methodology ◽  
Closed Loop ◽  
Design Method ◽  
Control Valve ◽  
Open Loop ◽  
Duty Ratio ◽  
Aero Engine ◽  
Servo Actuator

Focusing on the problem that the high stable quality and excellent servo performance of electrohydraulic actuator are needed in aero-engine control system, this paper aims to propose a complete design method for electrohydraulic servo actuator. Firstly, the static characteristics of mechanical-hydraulic system including solenoid control valve, slave valve and metering valve was analyzed to identify their main structure parameters. Secondly, a nonlinear model of this open-loop mechanical-hydraulic system was established in the framework of AMESim. Thirdly, the model’s transfer function was obtained through Prediction Error Methods (PEM) in system identification. Based on the above work, given that the saturation of duty ratio is a nonlinear link, an integral-separated PI controller was applied to constitute the closed-loop electrohydraulic servo actuator. Moreover, to get optimal performance, the controller parameters design was transferred into an optimization process using Differential Evolution (DE) algorithm. Simulation results illustrated that the designed closed-loop electrohydraulic servo actuator shows rapid servo tracking performance, small overshoot and low power loss. It is consistent with the actual engineering and can be used in most aero-engines. In addition, the entire design methodology is generic and can be transplanted in other actuators design.

The Design of Rudder System Simulation Device

2014 ◽  
Vol 602-605 ◽  
pp. 1344-1347
Author(s):  
Zi Lin Zhang ◽  
Yang Liu ◽  
Dong Di Liu ◽  
Hong Bo Wang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
System Simulation ◽  
Control Unit ◽  
Steering System ◽  
Control Mode ◽  
Electric Control ◽  
Ship Control ◽  
Operation Control

This paper designs a ship rudder system simulation device in order to serve the research of ship control better with the proportion of a real marine hydraulic rudder system, which can complete closed-loop experiments in the lab with the steering system. The rudder system simulation device mainly includes two parts, electric control system which uses PLC as core control unit, hydraulic system, and it can achieve both manual and automatic operation control mode.

Simulation of the effects of load on hydraulic servo actuators

SIMULATION ◽  
1969 ◽  
Vol 12 (3) ◽  
pp. 145-151 ◽  
Author(s):  
Myron Glickman
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Block Diagram ◽  
System Simulation ◽  
Loop System ◽  
General Description ◽  
Control Loop ◽  
Closed Loop System ◽  
Servo Actuator ◽  
Hydraulic Servo

Control system analysts are frequently called upon to include a hydraulic servo actuator as part of the loop in a complex closed-loop system simulation. This article presents a general description of several common types of hydraulic servo actuators and several methods for inclusion of the effects of load on the simulation of the actuator in the control loop. These methods are pre sented in block diagram form and are suitable for inclu sion in a larger simulation loop. The block diagrams themselves may be somewhat condensed and modified before inclusion in a larger simulation, but are presented here with all the details shown explicitly for clarity.

3 KHz Servo Bandwidth Demonstration by HDD Tracking Microactuator

2001 ◽  
Author(s):  
Toshiki Hirano ◽  
Matthew White ◽  
Xin H. Yang ◽  
Tetsuo Semba ◽  
Victor Shum ◽  
...  
Keyword(s):  
Continuous Time ◽  
Solder Ball ◽  
Closed Loop ◽  
System Simulation ◽  
Servo System ◽  
Open Loop ◽  
Closed Loop System ◽  
Reflow Process ◽  
Dual Stage ◽  
Suspension Beam

Abstract A demonstration of a closed loop system with a 3 kHz 0 dB open loop crossover using a microactuator in an HDD is reported. An electrostatic rotational microactuator is placed between the suspension beam and the slider, and moves the slider relative to the suspension. A new suspension with extra leads that provide signal to the microactuator was also developed. These leads are electrically connected by a micro-scale solder-ball reflow process. The dual-stage servo experiment was carried out in an HDD and a 3 kHz servo bandwidth was achieved, which is more than twice as high as a conventional servo system. The error rejection function also shows that this dual-stage servo system has superior error rejection capability over the conventional VCM-only servo system. Simulation shows that the bandwidth can be as high as 44 kHz, if a continuous-time servo is used.

Digital DC Speed Control System in Mine Hoist Application

2011 ◽  
Vol 219-220 ◽  
pp. 1017-1021
Author(s):  
Rui He ◽  
Yun Ping Ge
Keyword(s):  
Control System ◽  
Closed Loop ◽  
Speed Control ◽  
Closed Loop System ◽  
Pi Regulator ◽  
Control Precision ◽  
Speed Control System ◽  
Digital Trigger ◽  
Mine Hoist ◽  
Work Stability

Mine hoist shoulder important transport tasks. Through the analysis of the main circuit of mine hoist, this paper studies out ASCS digital DC speed control system whose core is microprocessor and whose hardware part constitutes digital trigger and double closed loop system. The software part not only achieves the system's digital PI regulator, logic switching, digital trigger phase shift, pulse channel selection and pulse width setting, but also realizes the systematic detection, monitoring, fault diagnosis, which improves the control precision and work stability of the system.

Tangible Programming for Basic Control System New Frameworks to Engineering Education for Children

2014 ◽  
Vol 931-932 ◽  
pp. 1298-1302
Author(s):  
Thiang Meadthaisong ◽  
Siwaporn Meadthaisong ◽  
Sarawut Chaowaskoo
Keyword(s):  
Control System ◽  
Engineering Education ◽  
Control Systems ◽  
Primary Schools ◽  
Closed Loop ◽  
Open Loop ◽  
Closed Loop Control ◽  
College Level ◽  
Loop Control ◽  
Tangible Programming

Programming control in industrial design is by its nature expert upon an example being Programmable Logic Controller (PLC). Such programmes are unsuitable for children or novices as they cannot understand how to use the programme. This research seeks to present tangible programming for a basic control system in new frameworks in engineering education for children. Such programmes could be for use in kindergartens, primary schools or general teaching where knowledge about basic control is required. Normally open-loop and closed-loop control system programming is taught at university and college level. This may be late as far as acquiring knowledge of basic control systems is concerned. Using tangible programming without a computer but instructions and interface, relay and motor could result in children in kindergartens and primary schools being able to programme open-looped control systems which mix chemicals or closed-loop control systems which control conveyor belts. However, the children would not be able to undertake programming using programmable control in a similar scenario.

DATA-BASED CLOSED-LOOP SYSTEM SIMULATION

2005 ◽  
Vol 38 (1) ◽  
pp. 440-445
Author(s):  
Faming Li ◽  
Robert E. Skelton
Keyword(s):  
Closed Loop ◽  
System Simulation ◽  
Loop System ◽  
Closed Loop System
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