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적외선 카메라를 이용한 용접부 안전성 평가에 관한 연구
김재열(Jae-Yeal Kim),송경석(Kyung-Seok Song),최철준(Choul-Jun Choi),김훈조(Hoon-Jo Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
RT and UT are largely used as a non-destructive assessment of welding defects. RT shows difficulty in radioactive exposure and real-time detection. UT shows difficulty in quantitative detection of defects, and examination of a wide area in a short time. In order to settle the aforementioned disadvantages, many researchers try to find solution. In this paper, we apply a new examination method to verify the effectiveness in order to supplement the disadvantages of UT and RT, the existing non-destructive methods. The new method proposed in this paper is to use a difference in heat conductivity. If there is a discontinuous part, that is an internal defect, there is a difference in heat conductivity. Using this fact, it is possible to check the existence of an internal defect due to a temperature difference on the part with a defect and the part without a defect when the welded part is heated. The temperature difference on the surface indicated by the difference in heat conductivity can be checked for a wide area within a short time, by means of a thermal image camera thereby to settle the disadvantage of the conventional non-destructive inspection methods. The thermal image method, however, has a disadvantage in that thermal load must be given to the tested sample and it is difficult to quantify measured data. In order to overcome this disadvantage, we will describe preliminary test and the like for applying thermal load on the tested sample including a welding defect, photographing images by means of a thermal image camera, analyzing thermal images, and analyzing welding defects.
김재열(Jae-Yeol Kim),송경석(Kyung-Seok Song),곽남수(Nam-Su Kwak),정효희(Hyo-Hui Jeong) 한국기계가공학회 2007 한국기계가공학회 춘추계학술대회 논문집 Vol.2007 No.-
Is accumulated in the fish farm floor and wall or attach food, excrement of fishes, other sludge and Crustacea are responsible for disease or wound of fishes. Therefore, cleaning in fish farm is essential. In this research, do it can do fish farm cleaning at short time as well as can remove sludge or Crustacea which is attached to floor and wall of fish farm certainly. Also, manufacture drainage pump by quality of the material that corrosion resistance is strong, and in anaphora water starting point that wear attains well in drainage pump divergence wedge loading-unloading system that can change divergence wedge that is been worn away establishing as is possible simply develop .
마이켈슨 간섭계를 이용한 초정밀가공기의 나노변위 측정에 관한연구
박대광(Dae-Kwang Park),송경석(Kyung-seok Song),김재열(Jae-Yeol Kim),곽남수(Nam-su Kwak) 한국생산제조학회 2009 한국공작기계학회 추계학술대회논문집 Vol.2009 No.-
Generally, the development of a laser interferometer to measure micro displacement for a micro system. The fibre optic laser encoder system was designed such a way which enabled measurement for the displacement of the high precision and the positional control. The laser interferometer is able to measure micro displacement during a few Nano seconds of non-contact. In order to retrieve a correct displacement information, the fibre optic laser encoder system and the environmental compensation unit was capable of compensating for the air reflective index and the temperature. The measuring environment would largely affect the measuring results. The measuring environment mainly consisted of the vibration and the air drift, and the temperature. In order to evaluate the environmental effect, the deviation of the light interference signal was coincided with the temperature while the optical system was maintained stay put and the vibration and the air drift were in the shielded condition. This Paper focuses on the influence to the position information of the system under temperature variation and without/with considering environmental error compensation and stability of frequency in the laser encoder.
Lamb파를 이용한 레이저 용접부의 비접촉 비파괴 검사
김재열(Jae-Yeal Kim),송경석(Kyung-Seok Song),최철준(Choul-jun Choi) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.9
This paper aims to study that the defect exploration method to specimen's thickness, using an characteristic of an ultrasonic wave generating in ablation area and thermo elasticity area, has been applied to using a way of receiving it by Air-Coupled Transducer and transmitting it by an ultrasonic wave and a way of noncontact receiving and transmitting ultrasonic wave using a laser. The longitudinal, transverse waves have been used in 60㎜ thickness specimen and Lamb wave in 3㎜ to run artificial defect detection test. In this way, the usefulness of noncontact laser ultrasonic wave has been verified To confirm the possibility of implementation on natural defect existing at real welding part, thickness in 3㎜ SM45C and STS304 artificial defect specimen has been made and defect detection test using Lamb wave has been executed. Detected signal by signal treatment has been expressed in visual not RF signal. By doing so the convenience of defect detection has been attempted and the effectiveness of defect signal visualization using Lamb wave has been confirmed compare with defect image through SAT.
초음파 결함신호 영상화를 이용한 레이저 용접부 비파괴 평가
김재열(Jae-Yeal Kim),송경석(Kyung-Seok Song),한재호(Jae-Ho Han),김훈조(Hun-Cho Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
This paper aims to study that the defect exploration method to specimen's thickness, using an characteristic of an ultrasonic wave generating in ablation area and thermo elasticity area, has been applied to using a way of receiving it by Air-Coupled Transducer and transmitting it by an ultrasonic wave and a way of noncontact receiving and transmitting ultrasonic wave using a laser. The longitudinal, transverse waves have been used in 60㎜ thickness specimen and Lamb wave in 3㎜ to run artificial defect detection test. In this way, the usefulness of noncontact laser ultrasonic wave has been verified. To confirm the possibility of implementation on natural defect existing at real welding part, thickness in 3㎜ SM45C and STS304 artificial defect specimen has been made and defect detection test using Lamb wave has been executed. Detected signal by signal treatment has been expressed in visual not RF signal. By doing so the convenience of defect detection has been attempted and the effectiveness of defect signal visualization using Lamb wave has been confirmed compare with defect image through SAT.
박대광(Dae-Kwang Park),김재열(JaeYeol Kim),송경석(Kyung-seok Song),정연오(Yeon Oh Jung),표석호(Seok Ho Pyo) 한국트라이볼로지학회 2009 한국트라이볼로지학회 학술대회 Vol.2009 No.11
in wide industry field, the Grinding machine belong in precision machine tools that use grinding whetstone and is used in finish process of product surface. For example, Grinding machine is applied in field of optic parts, information communication, and general machine manufacture. It is required at auto-component manufacture and electricity electron parts. Therefore, this Paper focuses on the influence to the precision machine position of the system with considering turning speed, the transfer speed, surface of grinding side by grinding depth that is rough shape analysis. This research does not disjoint damaged main shaft of machine tool to solve these problem, and develop spindle exclusive use grinder that can grind main shaft damaged directly attaching exclusive use grinder to bed of machine tool on the spot.
김재열(Jae Yeol Kim),유신(Sin You),김창현(Chang Hyun Kim),송경석(Kyung Seok Song),양동조(Dong Jo Yang),이창선(Chang Sun Lee) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.4
In this study, natural flaws in welding parts are classified using the signal pattern classification<br/> method. The storage digital oscilloscope including FFT function and enveloped waveform generator is<br/> used and the signal pattern recognition procedure is made up the digital signal processing, feature<br/> extraction, feature selection and classifier design. It is composed with and discussed using the distance<br/> classifier that is based on euclidean distance the empirical Bayesian classifier. Feature extraction is<br/> performed using the class-mean scatter criteria. The signal pattern classification method is applied to the<br/> signal pattern recognition of natural flaws.
김재열(Jae-Yeol Kim),한재호(Jae-Ho Han),오성민(Sung-Min Oh),송경석(Kyung-Seok Song),김우진(Woo-Jin Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.10
As a part of environmental pollution prevention and resources recycling, the regeneration of waste tire has been largely contributed to national industry. But, the worker has been evaded this regeneration process by reason of the best mischievous process condition among 3D industries. So, the first, the process condition of regeneratingwaste tire was analyzed. The second, the equipment or system was developed for the improvement of working strength and environment The last, researchers intend to solve these problems.