Fuzzy Logic Control in High Temperature Furnace

This work presents a novel technique to maintain temperature of a furnace using Fuzzy Logic.  The furnace temperature has to be controlled and maintained upto 1500 degree Celsius and the purpose of the furnace is to study the characteristics of welding materials at very high temperature.  Since the range of temperature above ambient is fairly high and the furnace working area is also large, the phenomenon of maintaining the temperature at the desired value poses many challenges.  In this work, Fuzzy Logic Control (FLC) system has been implemented by duly considering the working temperature range, as well as working area. The advent of the control system is, its ability to attain the set temperature at the set time and also to maintain it. A complete study of the furnace, as well as TRIAC based final control element has been done.  The choice of membership function is done, so that to minimize steady state errors and also to reach the set temperature at the pre-defined time interval.Fuzzy Logic uses conventional electronics and instrumentations along with Micro controllers for controlling the furnace temperature.  Complete mathematical modeling of the furnace temperature control system based on fuzzy technique delivers a good solution to this work.Keywords: Pulse width Modulation, Fuzzy logic control, Fuzzy logi

Pembinaan enjin pencariodits (online database for information technology student) di Politeknik Ungku Omar

Kajian ini adalah berkisar tentang pembelajaran rnelalui pencarian maklumat pembelajaran menggunakan enjin pencari. Terdapat banyak jenis enjin pencari yang popular di dalam internet seperti Yahoo, Google, Altavista, Infoseek dan Excite. Namun begitu, enjin pencari tersebut mempamerkan keputusan carian secara meluas dan ada kalanya tidak berkaitan dengan carian topik. Oleh sebab itu, pengguna internet perlu mempunyai kemahiran untuk melakukan carian bagi mendapatkan keputusan carian yang bersesuaian dengan carian ke atas topik. Pengguna internet juga mesti mengkaji dan mempraktikkan beberapa teknik untuk memperincikan keputusan carian dalam memperolehi maklumat yang relevan. Alternatif kepada masalah ini adalah membangunkan enjin pencari ODITS untuk kegunaan pelajar. Di dalam enjin pencari ini, aspek-aspek yang dikaji adalah rekabentuk antaramuka, penggunaan enjin pencari dalam mendapatkan bahan pembelajaran, pembelajaran kendiri dan rujukan tambahan untuk kegunaan pelajar. Seramai 28 orang pelajar Diploma Teknologi Maklumat semester III dipilih sebagai responden. Instrumen kajian yang digunakan adalah borang soal selidik. Ia dibahagikan kepada 5 bahagian iaitu bahagian A (demografi), bahagian B (bahan pembelajaran), bahagian C (pembelajaran kendiri) dan bahagian E (rujukan tambahan). Data-data yang diperolehi dianalisis dengan menggunakan perisian SPSS (Statistical Packages for the Social Sciences). Data-data dipaparkan di dalam bentuk min, peratusan dan sisihan piawai. Keputusan dibentangkan dalam bentuk jadual dan rajah. Dapatan kajian menunjukkan bahawa rekabentuk antaramuka enjin pencari ODITS adalah menarik dan enjin pencari ODITS boleh dijadikan bahan pembelajaran. Selain itu, pembelajaran kendiri dapat dilaksanakan dan penggunaan enjin pencari ini boleh dijadikan sebagai rujukan tambahan kepada para pelajar. Akhir sekali, beberapa cadangan untuk kajian lanjutan telah dikemukakan

Study on Multi-environment Factor Monitoring System of the Livestock Breeding

To aim at the characteristics of livestock environment in China, a livestock breeding multi-environment factor monitoring system was studied. In this paper, the design thought and main function of the system were introduced, and design methods of system hardware and software described too. To begin with, the hardware part of monitoring system is build. The detection equipments of temperature and humidity, carbon dioxide, ammonia, hydrogen sulfide, as well as light monitoring equipment are included in this hardware part, and the former four sensors are assembled together in order to establish the breeding environment parameter perception concentrator. Then the technology project based on RS485 and Zigbee is respectively devised according to the different situations, and the solution of hardware anti-jamming is also proposed accordingly. Secondly, the software part of environmental monitoring system is structured. The data acquisition system based on C/S structure is mainly responsible for the information collection and storage tasks of environmental parameters, and the acquisition system is capable of 24 hours of work. Furthermore, this acquisition system also includes perfect management mechanism and reliable detection mechanism, as well as the alarm information is recorded and the management personnel is timely informed when environmental information exceeds alarm value in poultry housing. The monitoring system is featured by high precise, appropriate price, powerful function, which is suitable for most environments of barn farming in China and provides us with important reference for future environment control

An overview of power electronics in electric vehicles

In response to concerns about energy cost energy dependence and environmental damage a rekindling of interest in electric vehicles (EV's) has been obvious. Based on the California rules on zero emission vehicles in the United States as well as similar tightened air pollution regulation in Europe Asia and much of the rest of the world the market size of EV's will be enormous. Thus the development of power electronics technology for EV's will take an accelerated pace to fulfill the market needs. This paper reviews the current status of multidisciplinary technologies in EV's. Various challenges of power electronics technology for EV propulsion battery charging and power accessories are explored. © 1997 IEEE.published_or_final_versio

Embedded fuzzy logic controller for positive and negative pressure control in pneumatic soft robots

A key challenge in soft robotics is controlling the large deformation experienced as a result of high compliance nature of soft robots. In this work, a software control strategy for regulating the amount of internal positive and negative air pressure inside pneumatic soft robots is presented. Since the air pressure has a direct effect on the amount of deformation, the position of the robot is controlled. Pressure control was implemented with a fuzzy logic controller, which is described with its performance shown. The approach can be integrated into any specified soft robotic actuator requiring pneumatic actuation e.g. bending, triangular and muscle actuators

An expert fuzzy logic controller employing adaptive learning for servo systems

An expert fuzzy logic controller with adaptive learning is proposed as an intelligent controller for servo systems. A key component of this controller is an adaptive learning mechanism which is used to self-regulate the scaling factors and the control action based on the error between the desired value and the plant output. The inference engine of this controller is based on the principle of approximate reasoning and the learning strategy is based on reinforcement learning. A novel approach of model reference adaptive control is also proposed for servo systems. The comparison of the performance between the proposed controller and PID controllers is discussed. The simulation results show that the performance of the proposed controller is better than the conventional approach or previous research. The real-time application demonstrates that a faster response of a servo system can be achieved. Furthermore, the proposed controller is relatively insensitive to variations in the parameters of control systems

RSL ROVER: Robotic Systems Laboratory Rugged Offroad Vehicle for Experimental Research

The goal of this project was to build an autonomous vehicle testbed for the Robotics Systems Laboratory. This testbed will be used by undergraduate, graduate, and faculty researchers to test different control methods, sensor combinations, vehicle control laws, and eventually autonomous navigation. This paper documents our accomplishments to achieve this goal; we built a hierarchical control system, robust actuator mounts, and an effective safety system. The result is a capable 6-wheeled offroad vehicle that can be electronically controlled by remote or directly by wire. A feed-forward control law was incorporated for speed control, yielding predictable performance given a desired speed. Actuators were tuned for fast, reliable response and wiring was kept organized. The team believes the vehicle will be a useful asset to the Robotic Systems Lab for future research. To improve upon our testbed, global positioning and a compass should be integrated along with other sensors that came with the vehicle such as a Lidar unit. With these additional components, the vehicle should be able to run autonomously

Design of Printing Environment Monitoring System Based on CAN Bus

环境温湿度的稳定控制对印刷行业意义重大。一方面，可以提高印刷产品质量和生产效率，带来经济效益。另一方面，能有效的推动绿色印刷、健康印刷，带来巨大的社会效益。本文主要针对当今印刷行业对环境要求越来越高的情况，基于CAN总线设计了一套能实时监控印刷车间内温度、湿度、以及设备运行状况的多参数的测控系统。通过该系统的自动调节，使车间内中环境参数处于适合印刷的最佳值，为高质量印刷提供稳定可靠的环境。 本文的主要设计思想是构建印刷车间环境自动控制系统，由一台PC机与多个微控制装置组成主从式网络结构，采用CAN总线通信网络进行数据传输，并通过读取实时和历史环境参数值来监控印刷车间的运行情况。 本文详细阐...For the printing industry, the stability control of environmental temperature and humidity is of great significance. On one hand, it can improve printing products quality and production efficiency to bring economic benefits; on the other hand, it can be effective in promoting green and health printing to bring great social benefits. This paper, mainly aiming to today's printing industry demand tha...学位：工程硕士院系专业：信息科学与技术学院自动化系_控制工程学号：X200822301

An overview of electric vehicles-challenges and opportunities

In response to concerns about energy cost, energy dependence and environmental damage, a rekindling of interest in electric vehicles (EVs) has been obvious. Based on the “California rules” on zero emission vehicles in the United States as well as similar tightened air pollution regulations in Europe, Asia and much of the rest of the world, the market size of EVs will be enormous. Thus, the development of power electronics technology for EVs will take an accelerated pace to fulfil the market needs. This paper reviews the current status of multidisciplinary technologies in EVs. Various challenges of power electronics technology for EV propulsion, battery charging and power accessories are explored.published_or_final_versio

Design and control of components-based integrated servo pneumatic drives

On-off traditional pneumatic drives are most widely used in industry offering low-cost, simple but flexible mechanical operation and relatively high power to weight ratio. For a period of decade from mid 1980's to 1990's, some initiatives were made to develop servo pneumatic drives for most sophisticated applications, employing purpose-designed control valves for pneumatic drives and low friction cylinders. However, it is found that the high cost and complex installation have discouraged the manufacturer from applying servo pneumatic drives to industrial usage, making them less favourable in comparison to their electric counterpart. This research aims to develop low-cost servo pneumatic drives which are capable of point-to-point positioning tasks, suitable for applications requiring intermediate performance characteristics. In achieving this objective, a strategy that involves the use of traditional on-off valve, simple control algorithm and distributed field-bus control networks has been adopted, namely, the design and control of Components-based Integrated Pneumatic Drives (CIPDs). Firstly, a new pneumatic actuator servo motion control strategy has been developed. With the new motion control strategy, the processes of positioning a payload can be achieved by opening the control valve only once. Hence, lowspeed on-off pneumatic control valves can be employed in keeping the cost low, a key attraction for employing pneumatic drives. The new servo motion control strategy also provides a way of controlling the load motion speed mechanically. Meanwhile, a new PD-based three-state closed-loop control algorithm also has been developed for the new control scheme. This control algorithm provides a way of adapting traditional PID (Proportional Integral Derivative) control theories for regulating pneumatic drives. Moreover, a deceleration control strategy has been developed so that both high-speed and accurate positioning control can be realised with low cost pneumatic drives. Secondly, the effects of system parameters on the transient response are studied. In assisting the analysis, a second order model is developed to encapsulate the velocity response characteristics of pneumatic drives to a step input signal. Stability analyses for both open loop and closed-loop control have also been carried out for the CIPDs with the newly developed motion control strategy. Thirdly, a distributed control strategy employing Lon Works has been devised and implemented, offering desirable attributes, high re-configurability, low cost and easy in installation and maintenance, etc to keep with the traditional strength for using pneumatic drives. By applying this technology, the CIPDs become standard components in "real" and "virtual" design environments. A remote service strategy for CIPDs using TCP/IP communication protocol has also been developed. Subsequently a range of experimental verifications has been carried out in the research. The experimental study of high-speed motion control indicates that the deceleration control strategy developed in the research can be an effective method in improving the behaviour of high speed CIPDs. The verification of open loop system behaviour of CIPDs shows that the model derived is largely indicative of the likely behaviour for the system considered, and the steady state velocity can be estimated using the Velocity Gain Kv. The evaluation made on a pneumatically driven pick-and-place machine has also confirmed that the system setup, including wiring, tuning, and system reconfiguration can be achieved in relative ease. This pilot study reveals the potential for employing CIPDs in building highly flexible cost effective manufacturing machines. It can thus be concluded that this research has developed successfully a new dimension and knowledge in both theoretical and practical terms in building low-cost servo pneumatic drives, which are capable of point-to-point positioning through employing traditional on-off pneumatic valves and actuators and through their integration with distributed control technology (LonWorks) by adopting a component-based design paradigm