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송성재 한국기계기술학회 2015 한국기계기술학회지 Vol.17 No.5
The industrial videoscope systems are basic devices for remote visual inspections of social infrastructures such as industrial plants, bridges, aircraft and vehicles. The market of the industrial videoscopes is growing steadily. Unfortunately the domestic market of the industrial videoscopes is filled with the expensive imported systems. Due to specific circumstances, we were compelled to develop the industrial videoscope system. It consists of microcamera module, image processing board, insertion tube and bending section. Several tests were performed to show the achievement of development objectives.
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송성재 대한의용생체공학회 2004 의공학회지 Vol.25 No.4
보행 중 각 관절의 모멘트를 계산하기 위한 역동역학 모델을 개발하였다. 모델은 1개의 상체와 3개의 체절로 하지를 구성하였고 3개의 병진 조인트와 12개의 회전조인트로 각 체절을 연결하고 뉴턴-오일러 방법으로 역동역학 해를 구하였다. 입력자료로서의 기구학적 사료는 3차원 동작분석 시스템에서 추출하였고 외력으로서 지면 반발력은 동기화한 힘측정판에서 구했다. 개발된 모델을 이용하여 비대칭 모델이나 질량중심의 이동을 포함한 해석 등 다양한 인체운동 해석이 가능하다. An inverse dynamic model of lower limbs is presented to calculate joint moments during gait. The model is composed of 4 segments with 3 translational joints and 12 revolute joints. The inverse dynamic method is based on Newton-Euler formalism. Kinematic data are obtained from 3 dimensional trajectories of markers collected by a motion analysis system. External forces applied on the foot are measured synchronously using force plate. The use of developed model makes it possible to calculate joint moments for variation of parameters.
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송성재 한국기계기술학회 2016 한국기계기술학회지 Vol.18 No.5
The electric flexible videoscope was developed. The developed components of the videoscope are insertion tube, 360 degrees full articulation tip with joystick control, detachable probe part, camera module equipped with CMOS sensor and adjustable high-intensity white LED light sources. The insertion tube can have strong torsional rigidity from the components of spiral spring and tungsten mesh tube. The handset with joystick control makes it possible to manipulate the videoscope tip articulation in 360 degrees of all directions easily. Over 90 degrees of bending angle measured from the straight camera probe makes it possible to inspect the surface of side wall. The detachable probe model can separate insertion tube with probe. It is useful to select proper length of insertion tube. Several tests were performed to check the development objectives.
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배관 내부검사를 위한 구동장치가 있는 영상검사장비 개발
송성재 한국기계기술학회 2018 한국기계기술학회지 Vol.20 No.4
The visual inspection device was developed for non-destructive test of piping from the inside. The developed components of the system can be classified as camera module, main body module named crawler module and system module. Because the system has driving part as electric motors, it can run not only the horizontal and vertical straight lines but also bend lines. The system has video processors, it can make it possible to display the video on the monitor and to save the video clips simultaneously. Several tests were performed to check the development objectives.
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송성재,탁태오,조병관 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.6_1
Kinematic sensitivity analysis which is useful in suspension design is performed. Suspension system is modeled with composite joints which greatly reduce the constraint equations. This allows a semi-analytical approach that is computerized symbolic manipulaton before nwnerical computations. From input data which are only hard points, it is possible to do kinematic analysis and sensitivity analysis.<br/> <br/>
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송성재,장호명,Song, S.J.,Chang, H.M. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.4
Analysis is performed to determine the optimal lengths or cross-sectional areas of refrigerator-cooled current leads that can be applied to the conduction-cooled superconducting systems. The binary current lead is composed of the series combination of a normal metal at the upper(warm) part and a high $T_c$ superconductor(HTS) at the lower(cold) part. The heat conduction toward the cold end of HTS part constitutes a major refrigeration load. In addition, the joint between the parts should be cooled by a refrigerator in order to reduce the load at the low end and maintain the HTS part in a superconducting state. The sum of the work inputs required for the two refrigeration loads needs to be minimized for an optimal operation. In this design, three simple models that depict the refrigeration performance as functions of cooling temperature are developed based on some of the existing refrigerators. By solving one-dimensional conduction equation that take into account the temperature-dependent properties of the materials, the refrigeration works are numerically calculated for various values of the joint temperature and the sizes of two parts. The results show that for given size of HTS, there exist the optimal values for the joint temperature and the size of the normal metal. It is also found that the refrigeration work decreases as the length of HTS increases and that the optimal size of normal metal is quite independent of the size of HTS. For a given length of HTS, there is an optimal cross-sectional area and it increases as the length increases. The dependence of the optimal sizes on the refrigerator models employed are presented for 1kA leads.
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송성재,고대환 한국기계기술학회 2015 한국기계기술학회 학술대회논문집 Vol.2015 No.11
In order to select the supporting points for large glass panels used for TFT-LCD monitors, an optimization method selecting the supporing points is presented. In this method we reduce the problem of 1 degree of freedom. ANSYS optimization module is used and optimization criterion is to minimize the maximum deflection.
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송성재,조병관,이장무,Song, Sung-Jae,Cho, Byung-Kwan,Lee, Jang-Moo 대한기계학회 1996 大韓機械學會論文集A Vol.20 No.1
A computer program for automatic deriving the symbolic equations of motion for robots using the programming language MATHEMATICA has been developed. The program, developed based on the Lagrange formalism, is applicable to the closed chain robots as well as the open chain robots. The closed chains are virtually cut open, and the kinematics and dynamics of the virtual open chain robot are analyzed. The constraints are applied to the virtually cut joints. As a result, the spatial closed chain robot can be considered as a tree structured open chain robot with kinematic constraints. The topology of tree structured open chain robot is described by a FATHER array. The FATHER array of a link indicates the link that is connected in the direction of base link. The constraints are represented by Lagrange multipliers. The parallel robot, DELTA, having three-dimensional closed chains is modeled and simulated to illustrate the approach.
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