Arjin Numsomran

DC Motor Speed Control using Fuzzy Logic based on LabVIEW

This paper presents implement in speed control of a separately excited DC motor using fuzzy logic control (FLC) based on LabVIEW (Laboratory Virtual Instrument Engineering Workbench) program. LabVIEW, is a graphical programming environment suited for high-level or system-level design. Therefore, the principle that are data flow model, different from text-base programming and a sequential model. The user-friendly interface and toolbox design are shown the high level of suitableness and stability of LabVIEW and fuzzy logic on speed control of DC motor. The fuzzy logic controller designed to applies the required control voltage that sent to DC motor based on fuzzy rule base of motor speed error (e) and change of speed error (ce). The results show the control as a FLC that do the comparison with PI and PID controller

PID Controller Design using Characteristic Ratio Assignment Method for Coupled-Tank Process

This paper presents the PID controller design for coupled-tank process using characteristic ratio assignment (CRA). The coupled-tank process is a challenge plant for testing the performance of PID controller because it is a high uncertainty nonlinear model. For this paper, the characteristic ratio assignment (CRA) which is satisfied specification of performance of control system. Furthermore, it is very convenient as a fast adjustment damping ratio as well as a high speed response. Finally, the simulation results can be illustrated the validity of our approach by MATLAB

Modeling of the modified Quadruple-Tank Process

This paper presents Modeling of the Modified Quadruple-Tank Process. The new general form of plant model is developed for illustrating the highly flexible plant structure which can be adjusted to many styles that are used for the propose of giving control system engineers experience with multivariable control system design. In this paper described clearly about structure and physical properties of Modified Quadruple-Tank Process, Mathematical plant modeling, Analysis of plant transfer matrix characteristic, Transformation of general form of plant model to several different styles of water level plant. The value of General form modeling concept for Modified Quadruple-Tank process is ability in transform its transfer matrix to several different styles just only assign the value of inlet and outlet valve ratio. By the several model of transformed Modified Quadruple-Tank, it can be used to teach students in the skills of understanding control limitation due to interactions, model uncertainties, nonminimum phase behavior, and unpredictable time variations, Design decentralized controllers, and understanding their limitations, Implementing decouplers to reduce the effect of interactions, and understanding their limitations.

Development of Redundant Bus Library for Arduino to Apply in SCADA System

In this paper, we developed the library for the microcontroller platform Arduino to apply in Modbus SCADA systems. This library allows Arduino board to communicate with RS-485 and use Modbus protocol which transmits data via a redundant bus. Experiments are conducted to compare the stability of data communication between a regular bus and a redundant bus which is the developed library. The results show the developed library Arduino board is able to communicate with redundant buses and more resistant to faults than conventional buses.

Smith predictor design by CDM for temperature control system

Smith predictor control is theoretically a good solution to the problem of controlling the time delay systems. However, it seldom gets use because it is almost impossible to find out a precise mathematical model of the practical system and very sensitive to uncertain system with variable time-delay. In this paper is concerned with a design method of smith predictor for temperature control system by coefficient diagram method (CDM). The simulation results show that the control system with smith predictor design by CDM is stable and robust whilst giving the desired time domain system performance.

Algorithmic ADC using current mode without DAC

This paper presents a principle of analog to digital conversion (ADC) based on a current mode circuit without DAC. For example, in this circuit the input value can be converted to a 4 bit output at each moment, and multiple output bit numbers by serial connection. In this current mode, the active current mirror and current comparators control the reference current by adjusting the W/L ratio. Its feasibility agrees with simulation results by the PSPICE program. The circuit design used a CMOS 0.5 /spl mu/m process which is capable of converting 4 bits in 50 ns, with a power consumption of 0.127 mW, input current of 0-100 /spl mu/A and single 3 V supply. From simulation testing, the conversion rate is faster than other methods using the same parameters.

Design of decoupled controller for TITO system using characteristic ratio assignment

Most control performances in actual design are usually defined by the time domain response such as overshoot, rising time, settling time, steady state error, etc.. There are few control design methods, which are able to apply directly to the purpose. The pole placement method is the most popular. The Characteristic Ratio Assignment (CRA) is one technique of pole placement based on defined parameter of characteristic equation. This technique can adjustment of speed response and the damping ratios by only one parameter. In this paper, CRA is use to design controller for two-input two-output (TITO) systems. By using the decentralized CRA controllers and eliminate interaction between loop transfer function with conventional decoupler design method. Several examples are present to illustrate the effectiveness of the proposed method and compared it with existing ones. It is show that CRA design is stable, robust, whilst giving the desired time domain performance.

Distributed control of network devices with remote terminal units

One of problems in industries is an installation for an automation system device such sensor, transducer, controller and so on those are located in different areas. Such problem makes a difficulty for maintenance and installation. The aim of this research attempts to design a high performance controller with remote devices. One attractive is to group near devices in near place together to centralizes control. This paper presents the operating program and network device groups distributed through digital and analog remote terminal unit (RTUs). Such devices are centralized by computer control and communicated with similar protocol through serial bus. Our scheme, there are many advantages such as, saving both time and cost, convenience compared to other ways

Design of PI controller using MRAC techniques for coupled-tanks process

The typical coupled-tanks process that is TITO plant has the difficulty in controller design because changing of system dynamics and interacting of process. This paper presents design methodology of auto-adjustable PI controller using MRAC technique. The proposed method can adjust the controller parameters in response to changes in plant and disturbance real time by referring to the reference model that specifies properties of the desired control system.

Multi level contract net protocol based on holonic manufacturing system implement to industrial networks

This paper presents a flexible manufacturing system (FMS) that cooperated with the holonic manufacturing system (HMS) with automatic material handling devices via industrial networks. The HMS is described as an intelligent manufacturing system that employs multi-agent system with negotiation protocols. The traditional HMSs negotiation protocol usually used the contract net protocol (CPN) and multi-level contract net protocol (MCPN). This paper develops a cooperative system that applies the concept of HMS to implement a distributed control system for automatic warehouse and FMS. Results from simulation indicated that our approach is able to improve the overall system flexibility. The system is able to reconfigure the re-order points, increase the system fault tolerances, and provide the dynamic rescheduling.