Teerawat Thepmanee

Application of GD 3 in value engineering for plastic-part design

This paper presents the technique in way engineering value that comes to apply for designing of product plastic. The technique analyzes the data of designing by GD3 and measures defensive problem in advance of engineering value. Consequently, the technique can prevent the problem and control the designing relate to engineering value before build a mold for product. For acquire knowledge give with the work and can design the product that can have picture stability. Moreover, This technique can decrease material loss, time operation and inventory.

Integrating m-Machine Scheduling into MRP

This paper presents an approach to integrate the m-machine production scheduling into Material Requirements Planning (MRP). In general, generating MRP considers only Bill of Materials (BOM) and ignores capacity constraints and operating sequences; therefore, a production plan is unachievable when scheduling is actually performed next on shop-floor. That is why recent research has focused on executing both MRP and scheduling simultaneously. Our approach uses an integer linear programming model to plan and schedule concurrently to look right through the capacity constraints and operating sequences. The objective function of the proposed model considers both planning and scheduling purposes that is to minimize total inventory costs and orders tardiness. All significant and inevitable concerns when separately generating MRP and schedule are incorporated with the model through several constraints. Numerical results show that this model can be used to simultaneously generate reasonable MRP as well as feasible and optimal m-machine production schedule.

An influential principal point on camera parameters

This paper proposes a method of camera calibration and the influence of principal point on camera parameters. The camera parameters are represented in terms of a set of intermediate parameters. The intermediate parameters and lens distortion coefficients are iteratively computed. The image coordinates are rectified on each cycle of iteration. Once the iteration is terminated, the initial parameters are computed from the obtained intermediate parameters. Then, the camera parameters and distortion coefficients are iteratively computed from the obtained initial parameters and the image coordinates are rectified too. In the experimental results, the proposed method is tested by change principal point to observe the influential principal point on camera parameters and compared the results with the conventional method.

A simple technique to modeling and simulation four-axe robot-arm control

This paper presents modeling and real-time simulation programs that were developed for robot arm control. The technique analyzes the safety path, working area and step motion of robot. The implementation of experimental forward and inverse kinematics control method as Matlab m-files is described. The visualization and animation capabilities of Matlab provide a realistic perception of behavior of the test beds without robot or before send the command to robot. Control mode in manual and automatic by a joystick and library file via PC respectively.

Inspection maintenance improvement for reducing common cause failures of k-out-of-n configurations: A case study of power plant

This paper presents an improvement of inspection maintenance actions to reduce common cause failures of k-out-of-n redundant structures. Improving maintenance tasks for the programmable logic controllers with 1002 voting configuration and the control valves with 2003 voting configuration in a thermal power plant is described as an illustrative case study. The proposed improvement is based on common-cause avoidance in replacement and repair procedures. Performances of the proposed technique are verified through reliability modeling of two interested voting configurations. The suggested maintenance improvement can increase the system reliability for redundancy as needed to maintain critical functions.

Process alarming in PID loop using foundation fieldbus with control in the field: A case study of DeltaV host system

This paper presents a software configuration guideline for process alarming in proportional-integral-derivative (PID) loop using Foundation Fieldbus (FF) with control in the field. Process alarm configuration of FF H1 segment installed in a level-control plant model and operated by the DeltaV host system is examined as an illustrative case study. Experimental results showing relations between alarm configuration and alarm notification of the studied system are included. The proposed practical guideline can be applied to develop a good fieldbus system alarm strategy for industrial processes.

Simple and low-cost voltage-controlled oscillator

This paper presents a simple circuit technique based on commercially available devices to implement voltage-controlled oscillator (VCO) with two high-impedance input terminals. By suitably setting two input signals, a linear frequency-voltage relation of the proposed VCO can be either positive or negative slope in the same scheme without any adapting configuration. The oscillation gain can be easily adjusted through the variation of a single resistor. Compared to the previous circuit based on similar technique, the proposed VCO offers significant improvement in circuit configuration. Its benefits are simpler structure, lower components, and lower costs. Experimental results showing performances of the proposed VCO are in close agreement with expected values.

The technique to generate firing signal of converter for linear dc output

The firing angle adjustment of ac-dc converter that adjust firing angle proportional to control signal. The dc output voltage is not linear. This paper presents the technique to generate the firing signal for ac-dc converter which has linear dc output voltage. This technique decoded the arccosine value as binary data and save in ROM, before compare with control signal. All digital circuits and ROM were constructed using field programmable gate array (FPGA) and Verilog Hardware Description Language (Verilog HDL) so that the proposed technique has small size and ease of implementation. The experimental results show the dc output voltage and output waveform that agree with the design. Moreover, this technique can be applied to multi-output for dual converter and 3- phase system.

LabVIEW-based system for testing centrifugal pump efficiency

This paper presents a test system for testing efficiency of single-suction centrifugal electric pumps for quality control in a manufacturers production line. The proposed system based on testing an individual pump for an expected total head provides automatic test procedures to be conducted in accordance with the requirements specified in the Thai Industrial Standard (TIS) 2618-2557. The hardware implementation consists of instruments for measuring process data and pump input parameters, controllers for maintaining test conditions and test procedures, and engineering/operator workstation. Pump testing, real-time monitoring, data gathering, and test reporting of the implemented system are based on LabVIEW. Centrifugal pump manufacturers in Thailand can use the proposed test system for determining the efficiency of their products on assembly line before official product testing and certification or customer shipment.

Reliability modeling for automatic operation mode of FSWO&FSWB system

This paper applies FMEA and FTA approach which has been proved to be acceptable and widely applied in many applications of modeling and methods supporting the production system and the safety and/or maintenance manager to identify how subsystems and components could fail and what are the corresponding effects on the whole system, and to quantify the reliability parameters for complex systems. A case study represents that the automatic operation mode from the primary fuel switch to secondary fuel called FSWO (Fuel Switch Over) procedure, which is the process of switching fuels from natural gas to oil fuel. For FSWB (Fuel Switch Back), this is process of switching from oil fuel to natural gas. The numerical illustrations and results substantiate that the model approach capable of pointing out and quantifying the importance of each component in the system.