http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
이호영(H.Y. Lee),조택동(T.D. Cho),양상민(S.M. Yang),고성호(S.H. Ko),신성기(S.K. Shin) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Air-operated globe valve is one of the principal valves which are used for controlling the fluid flow and the pressure in nuclear power plants. The periodic diagnosis has been carried out to guarantee the safety of nuclear power plants in spite of much expense. It is meaningful to study on the flow dynamics of globe valves in order to analyze its faults and to predict its performance. In this paper, the dynamic equation is modeled using the force balance equations. The numerical analysis is carried out to find out the exact differential pressure(DP) between the up and down side of the globe valve disk. The experiment is also preformed with a 2 inch globe valve. The simulation results show the similar output with the experimental results. The dynamic model is proved through the experiment and the numerical analysis.
양상민(S.M. Yang),신성기(S.K. Shin),이호영(H.Y. Lee),조택동(T.D. Cho),고성호(S.H. Ko) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
Globe valves are used to control the flow or the pressure of the pipe system in a nuclear power plant. The periodic diagnosis of them has been carried out to guarantee the safety of a nuclear power plant. Therefore it is necessary to study on the flow dynamics of globe valves in order to analyze its faults and performance. We acquired the 3D design information of the globe valve. A globe valve is made of acrylamide so that we can see the inside of the globe valve. The flow visualization test is carried out to analyze the inner flow of the valve. The test system is composed of the acrylic valve, a stripe laser and a high speed camera. The velocity distribution of the flow is analyzed by the flow analysis program with images captured by the high speed camera.
조택동 忠南大學校 産業技術硏究所 1994 산업기술연구논문집 Vol.9 No.2
Automatic seam tracking of arc welding is essential for improving the productivity and quality of the welding processes. All the necessary techniques to achieve this objective- welding machine, sensor, robot, and even computer-are ready recently. However, more efforts should be done to integrate these individual devices and to control the synthesised system. The weld joint tracking industry is just stretched from caution to optimism recently even in the developed foreign countries. In this research work, the control method for the automatic seam tracking has been investigated. It was assumed that information on the desired torch path was available from the infrared array sensor. The sensor is expected to be located ahead of the arc and behind the preheater which is desired to give a thermal field for the detector. This joint tracking system was analyzed and controlled as a time delay system. Both X and Y axes were controlled using a LQ optimal control algorithm. Every system was applied and tested for the various kinds of weld line. It was concluded that the designed control scheme was very effective especially when the desired path is curved smoothly as the actual weld line.
조택동,남기정 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.1
Vibration occurs in most machines operating with high speed, heavy duty and light weight structure. It is undesirable because of noise, energy loss and dynamic stress, which may lead to fatigue and failure of the structure. In this paper, we modeled a flexible cantilever as a simplified spring-mass system, and controlled its vibration. The dc servo motor was chosen as an actuator. Various control algorithms were developed based on the modern control theory(LQ-control) as well as conventional control theory(PI-control). LQ-control scheme gave much better results than that of PI-control as we expected.
Preview Algorithm을 이용한 V-홈 궤적의 자동추적에 관한 연구
김성훈,조택동 忠南大學校 産業技術硏究所 1995 산업기술연구논문집 Vol.10 No.2
Automatic seam tracking technique has been developed recently to achieve the welding automation using robot and various weld seam finder. This technique is essential for welding automation because unexpected distortion of weld line caused by heat input can occur during welding process. In this research, laser displacement sensor is used as a seam finder in the automatic tracking system. X-Y moving table manipulated by ac servo motor controls the position and velocity of the torch-and-sensor part. DC motor controls the position and velocity of the torch-and-sensor part. Following the weld line, the informations of joint position detected by laser displacement sensor are fedback to computer where the rotating angle of the torch and X-Y table input pulse frequency are calculated. X-Y table controls the position of sensor and relative position of torch is controlled by dc motor which is mounted at sensor-and-torch part(simulation). Sensor is always ahead of torch to preview the weld line. Preview control was added to conventional PI and LQ control to enhance the tracking performance. The simulation results show that, when preview control is applied, the tracking performance is improved significantly. Form the experimental results, we could see the possibility that the laser displacement sensor can be used as a seam finder in welding process and that the preview controller combined to conventional controller can give a good performance in tracking system as a controller of torch rotation angle.