A finite-time stabilization controller for the heating furnace temperature control system is proposed.Based on the extended Lyapunov finite-time stability theory and power integral method,a finite-time stable conditio...A finite-time stabilization controller for the heating furnace temperature control system is proposed.Based on the extended Lyapunov finite-time stability theory and power integral method,a finite-time stable condition of the heating furnace temperature control system is given.The temperature of the heating furnace is directed by the finite-time stabilization controller to make it stable in finite time.And the quality and quantity of slabs is improved.The simulation example is presented to illustrate the applicability of the developed results.展开更多
In rapid thermal processing of a semiconductor wafer, it is important to keep a given temperature rising speed of the wafer during the temperature rising process. We made an experimental apparatus to measure the tempe...In rapid thermal processing of a semiconductor wafer, it is important to keep a given temperature rising speed of the wafer during the temperature rising process. We made an experimental apparatus to measure the temperature rising speed of a ceramic ball of 2 mm in diameter heated with four halogen lamp heaters. The heating rate of the halogen lamp heaters was controlled by computer to keep a given temperature rising speed of 50 ℃/s with a controlling time interval of 0.1 s. We examined the effect of various heating control methods on the error of the temperature rising speed of the ceramic ball. We found that a combined method of control with prepared correlation and PID （proportional integral derivative） control is a good method to decrease the error of the temperature rising speed. The average error of the temperature rising speed is 0.5 ℃/s, and the repetition error is almost zero for the temperature rising speed of 50 ℃/s from 330 ℃ to 370 ℃. We also measured the effects of artificial control delay time and measuring error of the monitoring temperature on the error of the temperature rising speed.展开更多
Recently,polymer electrolyte fuel cell(PEFC)begins to be used in a lot of fields such as automotive industry and power generation etc.Therefore our laboratory developed the simple maintenance equipment which can diagn...Recently,polymer electrolyte fuel cell(PEFC)begins to be used in a lot of fields such as automotive industry and power generation etc.Therefore our laboratory developed the simple maintenance equipment which can diagnose a performance degradation of PEFC instantaneously by analyzing transient response at a current interruption.However,because it was not able to diagnose some operating conditions,we determined that it was necessary to improve the diagnostic algorithm.Therefore we developed a new algorithm which sequentially approximates diagnostic parameters by the on-line algorithm of the method of least squares.The adequacy of a new algorithm was verified using a PEFC single cell of 25 cm^2 applied about two Membrane Electrode Assemblies(MEAs)((a)10 mg,(b)7.5 mg)with different amount of platinum.As a result,we judged that this algorithm was able to apply to the new diagnostics because it distinguished the difference of two MEAs in each parameter.展开更多
This research work is focused on the design and fabrication of Novel Oven-Furnace, using locally sourced materials for the purpose of carrying out drying and thermochemical treatments in accordance to the Internationa...This research work is focused on the design and fabrication of Novel Oven-Furnace, using locally sourced materials for the purpose of carrying out drying and thermochemical treatments in accordance to the International Electric Equipment (IEE) regulations. Working drawings were produced, and mild steel sheet was used for the construction of the casing, while other materials for the construction were selected based on functions and properties of the materials, cost considerations and ease of fabrication into component parts. The design closely revealed the parameters and features of the furnace, but the control system was designed to function systematically as Oven and Furnace. Testing was carried out to evaluate the performance of the Oven-Furnace. From the result obtained, it was observed that the Oven-Furnace has fast heating rate which is comparable to rates of conventional brands of furnaces purchased from Germany or Canada. Unlike the ordinary furnaces, this equipment was designed to operate systematically to maintain constant temperature at any set temperature value. The lower cost of design of the Oven-Furnace coupled with its good heat retaining capacity, long estimated life time, uniform heating rate, controlled atmosphere, safety and ease of maintenance justifies the usage.展开更多
文摘A finite-time stabilization controller for the heating furnace temperature control system is proposed.Based on the extended Lyapunov finite-time stability theory and power integral method,a finite-time stable condition of the heating furnace temperature control system is given.The temperature of the heating furnace is directed by the finite-time stabilization controller to make it stable in finite time.And the quality and quantity of slabs is improved.The simulation example is presented to illustrate the applicability of the developed results.
文摘In rapid thermal processing of a semiconductor wafer, it is important to keep a given temperature rising speed of the wafer during the temperature rising process. We made an experimental apparatus to measure the temperature rising speed of a ceramic ball of 2 mm in diameter heated with four halogen lamp heaters. The heating rate of the halogen lamp heaters was controlled by computer to keep a given temperature rising speed of 50 ℃/s with a controlling time interval of 0.1 s. We examined the effect of various heating control methods on the error of the temperature rising speed of the ceramic ball. We found that a combined method of control with prepared correlation and PID （proportional integral derivative） control is a good method to decrease the error of the temperature rising speed. The average error of the temperature rising speed is 0.5 ℃/s, and the repetition error is almost zero for the temperature rising speed of 50 ℃/s from 330 ℃ to 370 ℃. We also measured the effects of artificial control delay time and measuring error of the monitoring temperature on the error of the temperature rising speed.
文摘Recently,polymer electrolyte fuel cell(PEFC)begins to be used in a lot of fields such as automotive industry and power generation etc.Therefore our laboratory developed the simple maintenance equipment which can diagnose a performance degradation of PEFC instantaneously by analyzing transient response at a current interruption.However,because it was not able to diagnose some operating conditions,we determined that it was necessary to improve the diagnostic algorithm.Therefore we developed a new algorithm which sequentially approximates diagnostic parameters by the on-line algorithm of the method of least squares.The adequacy of a new algorithm was verified using a PEFC single cell of 25 cm^2 applied about two Membrane Electrode Assemblies(MEAs)((a)10 mg,(b)7.5 mg)with different amount of platinum.As a result,we judged that this algorithm was able to apply to the new diagnostics because it distinguished the difference of two MEAs in each parameter.
文摘This research work is focused on the design and fabrication of Novel Oven-Furnace, using locally sourced materials for the purpose of carrying out drying and thermochemical treatments in accordance to the International Electric Equipment (IEE) regulations. Working drawings were produced, and mild steel sheet was used for the construction of the casing, while other materials for the construction were selected based on functions and properties of the materials, cost considerations and ease of fabrication into component parts. The design closely revealed the parameters and features of the furnace, but the control system was designed to function systematically as Oven and Furnace. Testing was carried out to evaluate the performance of the Oven-Furnace. From the result obtained, it was observed that the Oven-Furnace has fast heating rate which is comparable to rates of conventional brands of furnaces purchased from Germany or Canada. Unlike the ordinary furnaces, this equipment was designed to operate systematically to maintain constant temperature at any set temperature value. The lower cost of design of the Oven-Furnace coupled with its good heat retaining capacity, long estimated life time, uniform heating rate, controlled atmosphere, safety and ease of maintenance justifies the usage.
