Study on Process Control Characteristics of 22MN Fast Forging Hydraulic Press

2011 ◽  
Vol 201-203 ◽  
pp. 2258-2262 ◽  
Author(s):  
Jing Yao ◽  
Xiang Dong Kong
Keyword(s):  
Process Control ◽  
Raw Materials ◽  
Rapid Development ◽  
Negative Influence ◽  
Hydraulic Press ◽  
Control Precision ◽  
High Control ◽  
Press Performance ◽  
And Control ◽  
Control Accuracy

With the rapid development of modern industry, more and more high requirements for forging velocity and control precision have been proposed. Because it can not only increase productivity, but also can reduce the loss of the workpiece and save raw materials. Due to some characteristics such as high pressure, large flow, heavy moving inertia and so on, the process control performance of the fast forging hydraulic presses often have difficulty in their coordination between rapidity and stability, large shock during pressure relief and flow relief, low control accuracy and high accident rate. To overcome the negative influence and improve forging press performance, it is important to design forging curve. 22MN fast forging hydraulic press adopts electro-hydraulic proportional control system, the simulation and test results approved that the fast forging hydraulic press has high control accuracy and works stably without shock.

Research of Detection and Control System for Lunar Dust Effects Simulator

2012 ◽  
Vol 426 ◽  
pp. 126-130
Author(s):  
Zhi Rong Liao ◽  
Liang Zhou ◽  
D. Gao ◽  
X.L. Zhang ◽  
M.L. Yin
Keyword(s):  
Control System ◽  
Stepper Motor ◽  
Motor Speed ◽  
Lunar Dust ◽  
Convolution Filter ◽  
Speed Up ◽  
High Control ◽  
Dust Effects ◽  
And Control ◽  
Control Accuracy

To simluate the effects of lunar dust environment veritably by using lunar dust effects simulator, a detection and control system based on singlechip microcomputer was developed. In this system, peripheral circuits with stepper motor driver, temperature sensor and rotary transformer were used to collect the signals and control the temperature as well as speed. Stepper motor speed up/down curve, digital convolution filter and error compensation were adhibited for improving the system accuracy. The results showed that this method was simple, reliable and had high control accuracy.

The Design of Temperature and Humidity Control System in Multi Incubators Based on Fuzzy Control

2011 ◽  
Vol 130-134 ◽  
pp. 2400-2403
Author(s):  
Rui Lan Wang
Keyword(s):  
Fuzzy Control ◽  
Control Method ◽  
Control Algorithms ◽  
Hatching Rate ◽  
Hatching Time ◽  
Control Precision ◽  
Temperature And Humidity ◽  
High Control ◽  
Coupling Characteristics ◽  
Control Accuracy

Hatching systems requiring high control accuracy of temperature and humidity. Particularly temperature, small temperature change will significantly affect hatching time and hatching rate；and temperature and humidity is the controlled amount of interaction between two. Due to the coupling characteristics of temperature and humidity is difficult to establish a precise mathematical model, caused uncertainty in its control. Fuzzy control method witch proposed in this article will not only improve control precision, and to improve the robustness of control algorithms and adaptive capacity.

Communications in Process Control (Part 1)

1982 ◽  
Vol 15 (11) ◽  
pp. 427-432
Author(s):  
P. R. Matthews
Keyword(s):  
Process Control ◽  
Low Cost ◽  
Rapid Development ◽  
Transmission Efficiency ◽  
New Techniques ◽  
Communication Techniques ◽  
Arduous Task ◽  
And Control ◽  
Measurement And Control ◽  
Effective Transmission

The last decade has seen many new measurement and control techniques developed. This has been principally due to the development of low cost electronic circuits and, more recently, the microprocessor. As a result of this rapid development the instrument and process control engineer is faced with the arduous task of interfacing new and old equipment with differing transmission and communication requirements. The situation is further complicated by the numerous transmission and communication techniques that are available and the usual dogma of finding differing communication interfaces at either end of the connecting cable. This paper provides an insight to the array of transmission and communication techniques currently in use and looks at new techniques which are being developed. The application of the transmission and communication techniques to process control systems is a subject which is now under careful scrutiny as the establishment of an effective transmission and communication configuration can result in an appreciable cost advantage and increased transmission efficiency. A number of these configurations (networks) are discussed.

The Research for Electrostatic Spinning Parameters Control System at High Voltage

2012 ◽  
Vol 263-266 ◽  
pp. 776-780 ◽  
Author(s):  
He Gong ◽  
Cai Dong She ◽  
Jian Li ◽  
Shi Jun Li
Keyword(s):  
High Voltage ◽  
Displacement Sensor ◽  
Stepper Motor ◽  
Factors Affecting ◽  
The Core ◽  
Spinning Process ◽  
High Control ◽  
And Control ◽  
Material Temperature ◽  
Control Accuracy

In electrospinning at high voltage, material temperature, the distance between needle and collecting plate and the situation on pushing on material within needle are factors affecting the spinning quality. The paper used the microcontroller as the core, adopted the stepping motor to regulate collecting plate position driving machinery, got feedback by the displacement sensor. During the spinning process, using the infrared temperature probe to measure the needle, meanwhile controlling miniature stepper motor to advance material within needle in constant speed driving piston. The experimental results show that the system has high control accuracy, temperature accuracy can achieve 0.1°C, spinning interval is 1cm and control accuracy is 0.05mm. It provides technical support for a comprehensive, in-depth a electrospinning research.

Design Analysis of Water Hydraulic Digital Valve

2011 ◽  
Vol 101-102 ◽  
pp. 148-153
Author(s):  
Zeng Meng Zhang ◽  
Yong Jun Gong
Keyword(s):  
High Speed ◽  
Pulse Width Modulation ◽  
Simulation Models ◽  
Hydraulic Control ◽  
High Frequency Response ◽  
Water Hydraulic ◽  
High Control ◽  
And Control ◽  
Control Accuracy ◽  
Poppet Valves

Lubrication and sealing are the key research points in water hydraulic technology. A better seal is provided by the structure form of the poppet valve comparing to the spool valve, however, poorer linearity and control accuracy accompanies inevitably. Aiming at improving the control performance of poppet valves, the design of the water hydraulic digital valve is analyzed in this paper. A high speed digital valve is designed and controlled by PWM (Pulse-Width Modulation) and actuated by a piezoelectric ceramic stack with high frequency response and control stiffness. Another new design using poppet valves for digital bits is proposed to ensure enough seal ability and lower the cost of the valve, namely the multi-digit on-off valve. The simulation models of these two types of valves are built and the results show the different performances between the valves. The high speed digital valve is provided with high control accuracy and responsiveness. In contrast, large overshoot and oscillation are encountered during switching on the digits of the multi-digit on-off valve. Especially the switching process of the high digital bits requires to be regulated to reduce the large overshoot. The above analysis contributes to the improvement of lubrication and sealing in water hydraulic control valves and applications of water hydraulics in the industry.

Design of the Tracked Vehicle Based on the STM32

2014 ◽  
Vol 556-562 ◽  
pp. 1323-1327
Author(s):  
Wei Li ◽  
Shu Ying Sun ◽  
Jiang Yi Liu ◽  
Bin Qian Cao
Keyword(s):  
Angle Measurement ◽  
Tracked Vehicle ◽  
Control Precision ◽  
Control Command ◽  
Single Lever ◽  
Photoelectric Encoder ◽  
High Control ◽  
Control Principle ◽  
And Control ◽  
Measurement And Control

As the crawler vehicle with the excellent off-road performance, the battlefield survival ability, etc , are widely used in modern weapons systems In order to make teaching model close to the real equipment , designed a tracked vehicle of anti-aircraft gun based on the STM32F103 microcontroller, combined with the H-bridge motor circuit ,photoelectric encoder angle measurement and control principle of single lever operation, experimental results show that the tracked vehicle can complete forward, backward , turning and braking actions in accordance with the control command , with fast dynamic response , high control precision , to meet the design requirements.

scholarly journals Control System Design Technique and Validation for A High-Resolution Mapping Satellite

2021 ◽  
Vol 233 ◽  
pp. 04041
Author(s):  
Chen Chao ◽  
Wang ShuYi ◽  
Liu Jie ◽  
Wu Sen Tang
Keyword(s):  
Control System ◽  
High Resolution ◽  
Rapid Development ◽  
Attitude Measurement ◽  
Control Precision ◽  
High Resolution Mapping ◽  
Resolution Mapping ◽  
Future Direction ◽  
And Control ◽  
Measurement And Control

With the rapid development of the national economy, the digital city and smart city have become the development trends of China’s urbanization, proposing higher and higher requirements for earth mapping. The emergence of high-resolution mapping satellites has satisfied the demand for national economic development. Since China’s first satellite measuring scale of 1:10,000 was launched in 2019, thus GF-7 satellite has realized the arc-second attitude measurement accuracy, where the degree of stability reached 10- 5°/s. Based on the author’s multi-year research on the design of high-resolution satellite control system, the key technologies and design methods for the high-precision attitude measurement and control system were expounded, the validation results were explained, and the future direction for improving the control precision of the high-resolution mapping satellite was proposed in the end.

Simulation Study of the Electric Vehicle Charger

2014 ◽  
Vol 556-562 ◽  
pp. 1065-1068
Author(s):  
Gang Zhao ◽  
Xiao Ming Zhou ◽  
Hao Sai Sun
Keyword(s):  
Power Factor ◽  
Current Mode ◽  
Mode Switching ◽  
Switching Power Supply ◽  
Conventional Vehicle ◽  
Switching Power ◽  
Control Precision ◽  
And Control ◽  
Control Accuracy ◽  
A Current

For the low power factor and poor control accuracy of the conventional vehicle chargers, this paper designed a current-mode switching power supply which was improved by adding a boost-mode APFC circuit. This system was tested and simulated in MATLAB/Simulink and the results showed that it could effectively reduce the harmonics, improve the power factor and control precision.

Solid Waste Management on Romanian Households

2018 ◽  
Vol 68 (12) ◽  
pp. 2941-2947
Author(s):  
George Ungureanu ◽  
Gabriela Ignat ◽  
elena Leonte ◽  
Carmen Luiza Costuleanu ◽  
Nicoleta Stanciu ◽  
...  
Keyword(s):  
Waste Management ◽  
Solid Waste ◽  
Agricultural Development ◽  
Management Practices ◽  
Solid Waste Management ◽  
Raw Materials ◽  
Rapid Development ◽  
Disposal Site ◽  
Solid Waste Disposal ◽  
Factors Affecting

The problem associated with the household behavior on solid waste disposal site in today�s society is complex because of the large quantity and diverse nature of the wastes. Due increase the population, rapid development, global agricultural development has moved rapidly, limitations of financing, emerging limitations of both energy and raw materials and also add to the complexity of any waste management system, large quantities of wastes are being generated in different forms such as solid, liquid and gases. This research explored factors affecting the level of participation in solid waste segregation and recycling of households in Romania, as well as examining current Romania households waste management practices and their knowledge of waste management. This study investigated the solid waste situation and the organization of solid waste management in both urban and rural settings from the perspective of households. Solid waste management is a key component of public services which needs to serve the urban and rural municipalities in an efficient way in order to maintain a decent standard of public health.

Optimization and Control Petroleum Refinery Wastewater Treatment Systems — Status, Trends and Needs

1989 ◽  
Vol 24 (3) ◽  
pp. 463-477
Author(s):  
Stephen G. Nutt
Keyword(s):  
Wastewater Treatment ◽  
Process Control ◽  
Petroleum Refinery ◽  
Control Strategies ◽  
Refinery Wastewater ◽  
Statistical Process ◽  
Petroleum Refinery Wastewater ◽  
Optimization And Control ◽  
And Control ◽  
Wastewater Treatment Systems

Abstract Based on discussions in workshop sessions, several recurring themes became evident with respect to the optimization and control of petroleum refinery wastewater treatment systems to achieve effective removal of toxic contaminants. It was apparent that statistical process control (SPC) techniques are finding more widespread use and have been found to be effective. However, the implementation of real-time process control strategies in petroleum refinery wastewater treatment systems is in its infancy. Considerable effort will need to be expended to demonstrate the practicality of on-line sensors, and the utility of automated process control in petroleum refinery wastewater treatment systems. This paper provides a summary of the discussions held at the workshop.

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