Strategy Analysis of Override-Control for Drum Height of Shearers

2014 ◽  
Vol 915-916 ◽  
pp. 422-425
Author(s):  
Lei Zhang ◽  
Xiang Yu ◽  
Wei Li
Keyword(s):  
Control System ◽  
Coal Seam ◽  
Hydraulic System ◽  
Reliable Operation ◽  
Strategy Analysis ◽  
Manual Operation ◽  
Adjustment Mechanism ◽  
Controlling System

Aiming to solve the switch problem between auto-and manual-operation of shearer memory-cut due to variation of coal seam conditions, this paper proposes a method that introduces the strategy of override control to the controlling system of shearer memory-cut. This study also improves the control of hydraulic system for lifting cylinder, and designs an override control system for lifting cylinder of shearer. The procedure for controlling the height adjustment mechanism is thus addressed to offer a new control means for reliable operation of the shearer during operations.

The Research of New Kind of Automatic Hydraulic Bar Binding Machine

2011 ◽  
Vol 65 ◽  
pp. 336-340
Author(s):  
Cheng Qun Li ◽  
Chun Bin Yang ◽  
Jian Gong Li
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Compact Structure ◽  
New Model

On the basis of the research on the domestic and foreign binding machine, this article describes a new model of binding machine. Its compact structure is easy to operate and maintain. solidworks software is applied for modeling. Based on the plc-300 cpu module control system, not only ensures the speed and reliability bunch, but also gives good man-machine interactions. Hydraulic system saves energy effectively. Hydraulic components are distributed in the surface of its structure and easy to check repair.

scholarly journals Peran Levers of Control Terhadap Hubungan Antara Perencanaan Strategis dan Kinerja UMKM

2019 ◽  
Vol 1 (3) ◽  
pp. 166-174
Author(s):  
Praja Hadi Saputra ◽  
Hamid Bone ◽  
Indah Permatasari
Keyword(s):  
Control System ◽  
Sem Analysis ◽  
Management Control ◽  
Strategy Formulation ◽  
Management Control System ◽  
Controlling System ◽  
Mediation Hypothesis ◽  
Indirect Relationship ◽  
Levers Of Control

This study investigates the role of levers-of-control (LOC) based controlling system in the strategy formulation and MSME performance relationship in Samarinda. Through a survey conducted on the leadership (controller) of MSMEs in Samarinda City, this study evidenced the role of management control systems in the strategy formulation and MSME performance relationship. Of the 49 responses of MSME leaders, processed using PLS-SEM analysis, this study provided empirical evidence that the strategy formulation had a positive relationship with MSME performance. In addition, the indirect relationship between the two (mediation) through LOC-based management system supported the mediation hypothesis that the LOC-based management control system affects the strategy formulation and MSME performance relationship. In other words, it can be concluded that the management control system can increase the strategy formulation role that leads to MSME performance betterment.  

scholarly journals Developing a Control System in Order to Determine the Role of Economy

2018 ◽  
Vol 7 (4.36) ◽  
pp. 904
Author(s):  
Krylov A.A ◽  
Pobyvayev S.A ◽  
Selivanov A.I ◽  
Silvestrov S.N ◽  
Starovoitov V.G ◽  
...  
Keyword(s):  
Control System ◽  
Economic Security ◽  
Asian Countries ◽  
Russian Science ◽  
Security Systems ◽  
Controlling System ◽  
Wide Range ◽  
National Economic ◽  
National Economic Security

The task of the authors was to develop a certain control system to identify the role of country economic security in the Eurasian integration. To this end, the approaches to economic security in Europe, Russia and Asian countries are analyzed. The differences in the methods of controlling the national economic security and in the key approaches to its provision are primarily due to the historically established internal economic and geo-economic conditions. There is a fairly wide range of paradigms of controlling system implemented in national economic security, primarily the differences between the European approaches and the approach of Russia.  Given information based on mentioned control systems revealed that principles and mechanisms of organization of national economic security systems in Asian countries is practically absent in Russian science. It was also necessary to analyze the typology of control monitoring system in order to clarify the prospects of integration of national economic security systems. The authors substantiate the position that ensuring national economic security is an important imperative of integration and development in the Eurasian space, competitiveness and economic sovereignty of countries. The article systematically organizes the facts about the types of organization of national economic security, explains the need for the countries of Eurasia active control system of economic security as a response to the challenges of our time. The authors express a certain control syste, of Eurasian integration in the field of national security, involving both sovereignty and harmonization of national systems aimed at protecting economic interests.  

Research into the Variable Speed Pump Control System for Driving the Cutter Head of Shield Tunneling Machine

2009 ◽  
Vol 628-629 ◽  
pp. 257-262 ◽  
Author(s):  
Tong Xing
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Closed Loop ◽  
Control Method ◽  
Control Technique ◽  
Closed Loop Control ◽  
Variable Speed ◽  
Shield Tunneling ◽  
Loop Control ◽  
Cutter Head

The cutter head drive hydraulic system of φ1.8m simulate shield machine is introduced in this article, which has the variable speed pump control technique and the closed loop control method. The AMESim simulation model of the hydraulic system is built up, and the efficiency of the hydraulic system, speed control performance by open loop and closed loop control are analyzed. The result of the simulation shows that the variable speed pump control system has higher efficiency than the variable displacement pump control system about 4%-26% in the same condition when the cutter head speed is at the range of 0.5-4r/min, and the hydraulic system has good dynamic characteristics in closed-loop PID control.

scholarly journals Multi-Channel-Based Microgrid for Reliable Operation and Load Sharing

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2070 ◽  
Author(s):  
Ali Elrayyah ◽  
Sertac Bayhan
Keyword(s):  
Control System ◽  
Critical Loads ◽  
Experimental Studies ◽  
Load Sharing ◽  
Reliable Operation ◽  
Performance Simulation ◽  
Power Exchange ◽  
Novel Approach ◽  
Active Channels ◽  
Level Of Importance

This paper presents a novel approach to distribute available power among critical and non-critical loads in microgrids. The approach is based on supplying power over a number of channels with distinguishable frequencies where loads could be served by these channels according to their level of importance. The multi-channel scheme not only offers flexibility to supply loads but also to share power among adjacent microgrids. The control system, which can deal with multi-channel scheme, is presented and different applications that can be offered whereby are discussed. The number of channels that can be supplied by any inverter is determined based on the parameters of the used filter. Moreover, the power exchange efficiencies over the active channels at various power levels are determined and approximated formulas for quick evaluation are presented. To verify the proposed solution performance, simulation and experimental studies were performed. The obtained results demonstrate the effectiveness of using multi-channel scheme for power exchange in microgrid and also confirm the accuracy of the provided formula related to power exchange efficiencies.

Research of Velocity Stability of Separate Meter in and Separate Meter out Control System for Over-Running Load

2015 ◽  
Vol 727-728 ◽  
pp. 752-756
Author(s):  
Zhong Yi Cao ◽  
Xin Ming Liu ◽  
Wan Rong Wu
Keyword(s):  
Control System ◽  
Simulation Model ◽  
Hydraulic System ◽  
The Novel ◽  
Velocity Control ◽  
Factors Affecting ◽  
Simulation And Experiment ◽  
The Stability

There are some defects in the traditional over-running load hydraulic system, such as velocity control is poor and prone to velocity jitter, etc. In order to improve these weaknesses, the components and work principle of the separate meter in and separate meter out (SMISMO) were introduced and the actuator’s feature were analyzed , the simulation model of hydraulic studied system was built, the factors affecting the stability of the system are discussed in this paper. Simulation and experiment showed that the novel control system possessed higher velocity control precise and good stable characteristics.

Development of Sheet Material Stamping Automatic Feeding and Pick-Up Device

2010 ◽  
Vol 139-141 ◽  
pp. 1915-1918
Author(s):  
Yan Rong Li ◽  
Zong Wei Niu ◽  
Xiao Peng Sun
Keyword(s):  
Control System ◽  
Control Theory ◽  
Hall Effect ◽  
Power Supply ◽  
Hydraulic System ◽  
Sheet Material ◽  
Labor Intensity ◽  
Production Safety ◽  
Potential Safety ◽  
Working Principle

In stamping production the traditional manual feeding and pick-up manner can lead to potential safety problem. The automatic feeding and automatic pick-up device can ensure the production safety and ease workers’ labor intensity. A kind of automatic feeding and automatic pick-up device and its control system are designed. The configuration, function and working principle of the mechanism were described. Hydraulic system was taken as power supply. Siemens S7-200 was adapted as the center of control system, Hall-effect switch sensor CS1020 was used to detect the position of components. Control theory was studied and programmed. The device described in this paper can realize stamping automatic. Adjusting the position and number of sensors can realize the feeding and pick-up automation of all kind of workpiece, make the system has flexibility and suit the change of production.

Modeling and Simulation Research of Hydraulic Cylinder Speed Control System Based on High-Speed On-Off Valve

2012 ◽  
Vol 590 ◽  
pp. 161-164
Author(s):  
Qin He Gao ◽  
Wen Liang Guan ◽  
Hai Zhou Song ◽  
Zhi Yong Yang
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
High Speed ◽  
Speed Control ◽  
Hydraulic Cylinder ◽  
Simulation Research ◽  
Parallel Application ◽  
Proposed Model ◽  
Speed Control System ◽  
Small Flow

Application of high-speed on-off valve in the hydraulic cylinder speed control system was researched in this paper. Series and parallel application schemes between high-speed on-off valve and hydraulic cylinder are proposed. Model of high-speed on-off valve and hydraulic circuit were established to carry out simulation. The speed and acceleration curve of hydraulic cylinder were achieved by the means of simulation with Simulink. The simulation curves show that, two application schemes can both control the speed of hydraulic cylinder effectively. Series application scheme can be only applied to small flow hydraulic system; parallel application scheme has wider application.

Design of Computer Measurement and Control System for Electro-Hydraulic Stepping Cylinder

2011 ◽  
Vol 101-102 ◽  
pp. 1138-1141
Author(s):  
Sheng Hao Zhou ◽  
Jun Kai Cao ◽  
Jin Chun Song
Keyword(s):  
Control System ◽  
Hydraulic System ◽  
Electrical System ◽  
Measurement And Control System ◽  
Computer Measurement ◽  
Working Principle ◽  
And Control ◽  
Measurement And Control

To meet the requirements of measurement and control system for common servo-cylinder and considering the characteristics of electro-hydraulic stepping cylinder, a computer measurement and control system is designed. In this paper, the working principle of hydraulic system, the structure of electrical system, the process of measurements and the functions of testing software based on LabVIEW are introduced.

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