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金寬柱,崔升權 弘益大學校 科學技術硏究所 1997 科學技術硏究論文集 Vol.8 No.-
Robot development has been carried out continuously for the substitute of human for the working environment of danger and hard to access it. One requirement for this usage is the self-mobility of robot like human walking. In this paper, the walking mechanism of quadrupedal robot has been examined in point view of dynamic stability. Robot has been modeled as a double pendulum. Trajectory of robot toe is calculated and equation of motion is derived by Lagrange's method. Required knee-and pelvic-joint torques have been calculated which are compared by ADAMS, the commercial dynamic software. Two different types of toe shapes, simple bar end shape and one with front and rear toe have been considered. The working mechanism of two-toe with shock absorber is explained and the results of toe displacement and torque of pelvic joints are calculated and compared with experiment data.
평판의 진동에 의한 소리의 방사 및 철도차량 실내소음 해석에의 응용
金寬柱,李奉魯 弘益大學校 科學技術硏究所 1996 科學技術硏究論文集 Vol.7 No.1
The problem of sound radiation by vibrating plates is based on understanding the radiation characteristics of structures. In fact, many practical structures can be modelled by rectangular, uniform, flat plates. Such examples are walls and floors of buildings, parts of vehicle shells, and floors of railway vehicles, and so forth. In this paper, the relation between vibration and noise of the simple rectangular plate are analyzed by using of analytical method and numerical method. However, in the case of the railway vehicles, it is not easy to analyze the sound radiation phenomena by means of theoretical method. Hence, the sound pressure fields at arbitrary point inside the cabin is evaluated by using of commercial software SYSNOISE.
金寬柱,兪相旭 弘益大學校 科學技術硏究所 1998 科學技術硏究論文集 Vol.9 No.1
The SONAR(SOund NAvigation and Ranging) is the system that detects objects under the sea and finds their locations by using the echo ranging technique. In this paper, as a fundamental research for finding out the SONAR characteristics, scattering phenomena for a rigid spherical scatterer and an elastic spherical scatterer are analyzed using both closed from solution, and Boundary Element Method and Finite Element Method. The results from each technique are compared. For the rigid scattering case, the solutions from closed form, BEM and FEM are closed enough. For an elastic scatterer case, coupled problem between acoustic and vibration should be considered. The results show structural resonances of the elastic sphere are closely related the sound field near the scatterer.
金寬柱,文洪晙 弘益大學校 科學技術硏究所 1995 科學技術硏究論文集 Vol.6 No.-
In recent years, the problems of noise and vibration are critical issues in order to reduce the weight of internal combustion engine components. It is found that the bending, torsional and lateral vibration of crankshaft are the main causes of engine noise and vibration problems. Therefore it is necessary to identify the vibration behavior of crankshaft. In this paper, the vibration analysis of hollow crankshaft was carried out. The torsional vibration characteristics of hollow crankshaft were analyzed and compared with those of same size solid crankshaft in respect of equivalent mass and stiffness by using I-DEAS. The natural frequencies and mode shapes of both crankshafts are measured by impact hammer test using LMS CADA-X system.