Krit Smerpitak

Load swing control of an overhead crane

This paper proposed a controllers design method for controlling the load swing of an overhead crane. By addition of the quadratic derivative of state variables term in the usual standard performance index for Linear Quadratic Gaussian (LQG) optimal control as an extra weighting function to play the role in this task. The results revealed that the swing of the load can be decreased at numerous requirements with excellence. How to select the suitable weights for control is also suggested.

The application of finite element to analyze the accuracy for radar system

Radar is one choice for level measurement in petrochemicals industry with high degree of accuracy. The radar provides a non-contact sensor that is virtually unaffected by change in process temperature, pressure or the gas vapor composition within a vessel. The measurement accuracy is unaffected by change in density, conductivity and dielectric constant of product being measure or by air movement above the product. These benefits have become more significant to the process industry since the advent of radar owing to low maintenance cost as there are no moving parts. This is the reason radar are so popular for industrial applications presently. However we found that some measurement value deviates from the actual level after the radar is in operation for few years. We have used Finite Element Technique to investigate for deviation, as our case study.

A technique for mechanical adjustment of DC motor by virtual model

This paper presents a technique to adjust and improve mechanical responses of DC Motor. The proposed technique uses math model for simulation to observe the transience and steady state response in no-load condition. Information derived from the simulation results can be applied to compensate the mechanical loss, inertia, viscous friction by feeding electrical energy. The test results of the compensation technique in this research can adjust and improve the response of speed and torque under reasonable tests. Moreover, this technique can apply to virtual load for Dynamometer.