Single Control System Research Articles

A performance comparison of single product kanban control systems

This paper presents a simulation experiment comparing the Single Stage, Single Product Base Stock (BS), Traditional Kanban Control System (TKCS) and Extended Kanban Control System (EKCS). The results showed that BS incurs the highest cost in all scenarios; while EKCS is found to be effective only in a very niche scenario. TKCS is still a very powerful factory management system to date; and EKCS did not perform exceptionally well. The only time EKCS did outperform TKCS was during low demand arrival rates and low Backorder (C b ) and Shortage costs (C s ). That is because during then, it holds no stock. The most important discovery made here is that EKCS becomes TKCS once it has base stock (or dispatched kanbans). The results have also evinced the strength of the pure kanban system, the TKCS over BS. Hence managers using BS should consider upgrading to TKCS to save cost.

Integration of Renewable Energy Resources in Microgrid

Microgrid is a new concept in power generation. The Microgrid concept assumes a cluster of loads and micro sources operating as a single controllable system that provides both power and heat to its local area. Not much is known about Microgrid behavior as a whole system. Some models exist which describe the components of a Microgrid. In this paper, model of Microgrids with steady state and their transient responses to changing inputs are presented. Current models of a fuel cell, microturbines, wind turbine and solar cell have been discussed. Finally a complete model built of Microgrid including the power sources, their power electronics, and a load and mains model in MATLAB/Simulink is presented.

Optimal Design of Stochastic Distributed Order Linear SISO Systems Using Hybrid Spectral Method

The distributed order concept, which is a parallel connection of fractional order integrals and derivatives taken to the infinitesimal limit in delta order, has been the main focus in many engineering areas recently. On the other hand, there are few numerical methods available for analyzing distributed order systems, particularly under stochastic forcing. This paper proposes a novel numerical scheme for analyzing the behavior of a distributed order linear single input single output control system under random forcing. The method is based on the operational matrix technique to handle stochastic distributed order systems. The existing Monte Carlo, polynomial chaos, and frequency methods were first adapted to the stochastic distributed order system for comparison. Numerical examples were used to illustrate the accuracy and computational efficiency of the proposed method for the analysis of stochastic distributed order systems. The stability of the systems under stochastic perturbations can also be inferred easily from the moment of random output obtained using the proposed method. Based on the hybrid spectral framework, the optimal design was elaborated on by minimizing the suitably defined constrained-optimization problem.

Inverse Kinematic Control of a Dual Crane System Experiencing Base Motion

For over 30 years, many active and passive antipendulation concepts have been explored for use on cranes in the marine environment. These range from simple tension member restraints to command filtering strategies and advanced feedback control laws, where both measured ship/platform motion and payload swing are required. Single crane control systems that compensate for own ship or target ship motion and payload swing damping are well developed, and have been demonstrated. Cargo transfer control is more complex when multiple ship-mounted cranes are used, representing a closed kinematic chain. However, the potential benefits include larger capacity and better load control. In this brief, an inverse kinematic control strategy is presented that uses two cranes' actuation capability (hoist lengths and boom angles) to keep its load fixed in inertial space regardless of the motion of the ship on which the cranes are mounted. An underdetermined solution is developed. Unique crane commands can then be computed using a minimum norm solution. A dynamic simulation is described for use in algorithm development and initial validation. Final verification was performed using two cranes mounted on a motion controlled platform.

Design and Analysis of a Sustainable LV Residential Microgrid

In the present scenario, power cuts are daily occurrences in many parts of the world. People all over the world would like to avoid these unscheduled power cuts and have a reliable, secure and clean electricity. For an affordable energy usage, sustainable power generation with renewable resources are highly recommended for environment friendly generation of energy with lower carbon footprints. They are isolated from the utility grid in case of any power outage or power blackouts. The key objective of this work is to model a self-sustained microgrid from the existing Indian distribution feeder, which means a small scale interconnected, centralized single controllable system where the particular arena is supplied with distributed energy resources like solar and wind instead of the main grid. The existing system of a particular region supplied with 42 bus system layout connected with 100 KVA transformer. Wind and the solar sources are designed individually and this hybrid energy is interconnected with the layout model to make up a small, modern self-sustained grid called the microgrid. The results are obtained in PSCAD software package with several case studies.

Simulation Research of Anti-Sliding Control of Urban Rail Brake System Based on AMESim and Simulink

Anti-sliding control of urban rail brake can effectively improve the adhesion utilization rate of the train, shorten braking distance and prevent wheel scratches. This paper takes differential velocity plus slip rate and speed reduction plus its differential as slip criterion, using logic threshold control method to establish Single wheel anti-slip control system. Pneumatic model, mechanical model and control model are built in AMESim and Simulink to implement co-simulation. Simulation results show that the comprehensive model can effectively achieve the anti-slide function. And by taking wheel glide distance as evaluation index, the merits of the two kinds of antiskid criterion are analyzed. The results show that deceleration and deceleration differential criterion as sliding criterion effect is better.

유리온실과 플라스틱 온실의 환경조절시스템 비교분석

In order to set up the basic environmental control systems which the new concept greenhouses have to equip, greenhouse characteristics, environmental management and control systems in domestic glasshouses and plastic houses were investigated and analyzed comparatively. Survey results on the width, length, eaves height, and the number of spans etc. showed that glasshouses were bigger than plastic houses significantly. New concept greenhouses claim to be plastic houses, but it will be reasonable to follow the specifications of the glasshouse. Specifications to be applied to new concept greenhouses were proposed as follows; hot water heating systems, aluminum screens as the thermal curtain, evaporative cooling systems, roof vents on the ridge, circulation fans, CO2 enrichment, hydroponic systems, and automatic irrigation control systems. Environmental measurement systems for the indoor and outdoor temperature, humidity, light, wind speed and indoor CO2 concentration have to be fully equipped. The automatic control system has to be as a complex environmental control system, not a single item control system. Also, for stable dissemination, domestically producing complete greenhouse control system should be made as soon as possible.

A Model Predictive Control Approach to Microgrid Operation Optimization

Microgrids are subsystems of the distribution grid, which comprises generation capacities, storage devices, and controllable loads, operating as a single controllable system either connected or isolated from the utility grid. In this paper, we present a study on applying a model predictive control approach to the problem of efficiently optimizing microgrid operations while satisfying a time-varying request and operation constraints. The overall problem is formulated using mixed-integer linear programming (MILP), which can be solved in an efficient way by using commercial solvers without resorting to complex heuristics or decompositions techniques. Then, the MILP formulation leads to significant improvements in solution quality and computational burden. A case study of a microgrid is employed to assess the performance of the online optimization-based control strategy and the simulation results are discussed. The method is applied to an experimental microgrid located in Athens, Greece. The experimental results show the feasibility and the effectiveness of the proposed approach.

The Laser Focus Position Control System Based on Motion Controller

Laser cutting focus position automatic tracking system of control precision directly affects the quality of laser cutting processing. There is a low anti-jamming capability, poor quality,poorer openness and poorer dynamic response short comings in the inductive sensor or the capacitive sensor and constitute of the single chip microcomputer control system. This paper introduces a laser focus automatic tracking system based on motion controller, using optical encoder as displacement sensor, use the motion controller of master-slave tracking (electronic gear) function implementation focus position error compensation quickly. Improve the quality of system control, openness, the stability and reliability.

An EEG Application Platform’s Design and Development

An realization of EEG application platform is displayed in this article. EEG signals are gathered and processed by Head-mounted device to obtain control use parameters, which is to be transmitted to the PC platform or the single-chip control system through Bluetooth. The software on the PC platform could make use of the control use parameters, while the single control system could output instructions to control the connected hardware, according to the computation results of the parameters.

A Power Quality Improvement for Microgrid Inverter Operated In Grid Connected and Grid Disconnected Modes

The renewable energy based distributed generators (DGs) will plays a dominant role in electricity production. A micro grid consists of clusters of load and distributed generators that operate as a single controllable system. The interconnection of the DG to the utility/grid through power electronic converters has raised concern about safe operation and protection of the equipments. The main objective of this paper is too focused on the power quality improvement in micro grid. In the distributed power system, the increased infiltration of nonlinear loads and power electronic interfaced distribution generation systems creates power quality issues such as voltage unbalance, frequency regulation and harmonic elimination.

Multi-Function Stepper Motor Design Based on MCS

The multifunctional stepper motor is built on the basis of ordinary stepper motor, combined with single chip microcomputer control system, dedicated driver chip STK672-040 and chip ULN2003A function, it can not only do the actual stepping motor testing but also can set out the particular function of stepper motor. In addition, the system can link an external circuit and cooperate with the external circuit to complete the work required.

Design of Control System for 6-DOF Platform

6-DOF platform is widely used in large parts assembly, it is important to enhance the control precision of 6-DOF platform in the assembly environment. Base on kinematics analysis, the posture input is converted into the single cylinder commands, which is sent to the single cylinder control system. Then the single cylinder control system is presented. The experimental results verify the effectiveness of the control system.

The J-TEXT CODAC system design and implementation

Inspired by the ITER COntrol, Data Access and Communication (CODAC) and ITER instrumentation and control system, J-TEXT tokamak has upgraded its control system with J-TEXT CODAC system. The J-TEXT CODAC system is based on Experimental Physics and Industrial Control System (EPICS). The J-TEXT CODAC system covers everything in the J-TEXT control system including both central and plant control systems, similar to the ITER I&C system. J-TEXT CODAC system is built around a single central control system called Central CODAC system. All the control functions including conventional control, interlock, safety and other common services are supervised by CCS. The J-TEXT CODAC system has been implemented and tested on J-TEXT. It not only tests some of the ideas in ITER CODAC in real life, but also explores the feasibility of new approaches that is unique in J-TEXT CODAC system.

The Research of Multi-Car Elevator Control Method Based on PSO-GA

Multi-car elevator system is a new technique which can reduce the occupied area and improve the transport efficiency in the high-rise and super high-rise buildings. It is remain to be studied in both the control strategy and scheduling method compared with the traditional single elevator group control system, In order to improve the utilization rate and shorten the waiting time, the particle swarm algorithm PSO and GA genetic algorithm optimization control method are studied aiming at the rationality of scheduling strategy of the rationality of elevator. Combining the advantages of two algorithms proposed a novel optimal scheduling algorithm for PSO-GA and carried on simulation analysis, the experimental results demonstrate the effectiveness of the new method of improved PSO-GA.

Design and Realization of the Process Tracking System for Plate Plant

The purpose of this paper is to improve the process tracking system, in order to meet the factory MES system requirements. Through the research process control systems and single process control system used in iron and steel enterprises in home and abroad, the integrated process control system, tracking control system and data acquisition system were established, and applied to the heat treatment lines of JISCO. In this system, the store procedure was used to complete the transaction processing in the database for improve the flexibility of the system. Practical applications validate the security and stability of performance system.

SCM Control Based on Matlab Simulation Technology Applications

The SCM controller is a special digital controller PID control system, for example to achieve the simulation of the control system are established SCM control system simulation model based on the operating characteristics of the single-chip controller in the Matlab environment. Single chip computer controller is a peculiar digital controller. Based on the characteristics of single chip computer controller, the simulation model of single chip computer control system in Matlab is established. The simulation of single chip computer control system is realized by taking the example of PID control system.

Construction of Computer Controlled Bioreactor

Bioprocess automation is developing fast for the reasons of quality control, production cost reduction et. al.. Bioreactor is the central equipment of bioprocess. Construction of computer controlled bioreactor is need for bioprocess automation. In this research, a two level hierarchical structure computer control bioreactor system is designed and constructed. The lower level plays the major role of set-point feedback control of process variables and the higher level plays the major role of graphical human interface and biological mathematical model solution. This control system has advantages of high reliability and flexibility than the single level digital control system, and has plenty of functions and high practicality compared with a normal commercial one.

Simons Says: Strategic Variables, Levers of Control and Control Systems

There has been increased use of Simons’ levers of control framework in the last decade. However, despite its increasing use there is still confusion in the literature surrounding particular aspects of the framework such as the concept of interactive control systems. This purpose of this paper is to contribute to the development of Simons’ framework as an analytical tool for interpretive studies. We examine the theoretical building blocks of Simons’ framework and add clarity to the relationships between strategic variables, levers of control and control systems. We develop three propositions dealing with (1) the need to differentiate strategic variables from levers of control, (2) the use of a single control system in managing multiple strategic variables, and (3) the role of management attention and energy channeled through the control system in enabling the use of the control system as a lever to manage more than one strategic variable. We discuss the implications of these propositions for researchers.

The Application of Adaptive Fuzzy PID in the Liquid Level Cascade Control System

As liquid level cascade system has the character the issue of non-linearity ,time variability and the overshoot,tradition PID control can not meet the requirement of precise molding system. So devise a self-_ adaptive fuzzy PID control .A self-_ adaptive fuzzy PID control combined PID to control calculate way and faintness to control the advantage of method, this text permits water tank to carry on mathematics model to design the double permit a water tank liquid misty PID string class control system. Matlab/Simulink and fuzzy logic toolbox are simulated to the single loop PID control system,the cascade control system and the cascade control system based on fuzzy self-tuning PID were simulated with Simulink. The analysis and simulation results indicate that the character issue of non-linearity ,time variability and the overshoot of the liquid level cascade control system based on a self-_ adaptive fuzzy PID controller are superior to previous of two methods.