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RISS 인기검색어
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- 저자 : 조선휘 (검색결과 33 건)
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조선휘,박종근 한국자동차공학회 1981 오토저널 Vol.3 No.2
In this paper, it was attempted to verify how the strength around fillet area of shifted gear would be affected by variables such as number of teeth, shifted value, and diametral pitch.<br/> Thereafter, the Lewis’ tooth factor of the shifted gear was computed in terms of previously mentioned variables in order to observe the characteristics of stress change related from tooth factor and tooth number with the parameter of shifted values and diametral pitches. From the results of quasi-theoretical values by Finite Element Method (F.E.M.) and experimental values through the photo-elastic tests, the followings were identified.<br/> The more the number of gear teeth increased, the more the profile of the tooth became close to that of rack, and accordingly the stresses in the fillet area decreased significantly in certain range. Furthermore, as the shifted value and pressure angle increase the stresses tend decreSe (Fig. 1).<br/> Moreover, the stresses analyzed by F.E.M. in the filled area became around 1.22 times larger than the stresses computed by Lewis ’form factor (Tab. 3), and this is supposed as an influence of the stress concentration in fillet area.
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조선휘 대한전기학회 1977 전기의 세계 Vol.26 No.4
본고에서는 다음의 내용을 다루었다. 1. 설립취지 2. 설립경위 및 연구소위치 3. 연구소규모 및 사업추진계획 4. 조직 및 요원 충원계획 5. 사업내용 및 효과
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4절 링크 기구의 동적 변형 해석 (I) 유한 요소 해석 및 수치해
조선휘,박종근,이진,Cho, Sun-Whi,Park, Jong-Keun,Lee, Jin 대한기계학회 1992 대한기계학회논문집 Vol.16 No.4
본 연구에서는 링크를 여러개의 2절점 6자유도의 보 요소로 이상화하고 링크 의 운동을 평면 운동으로 한정하며 링크의 지지부의 강성은 무한대이고 회전 대우 부 분의 간극은 없는 것으로 가정하여 링크의 탄성 변형에 관한 운동 반정식을 유도하였 다. 즉, 변위법에 기초한 정적 변위 해석에 관한 유한 요소법에서 관성력, 중력 그 리고 외력을 외부 부하로 간주하여 동적인 운동 방정식을 유도하였다. 여기에, 회전 대우의 베어링을 선형 스프링으로 이상화하여 유연성 링크의 일부분으로 고려함으로써 베어링의 탄성 변형이 유연성 링크의 동적 변형에 미치는 영향에 대하여 고찰하였다. 베어링의 탄성 변형이 고려된 유연성 링크에 관한 운동 방정식을 모우드 중첩법에 근 거를 둔 수치해법으로 그 해를 구하였다. Analysis of elasto-dynamic deformation of flexible linkage mechanism is conducted using the finite element method. The equations of motion of the system are derived from the static structural problem in which dynamic inertia, gravitational and driving forces are treated as external loads. Linear spring model is included in the formulation of equation of motions to represent the effects of deformation of elastic bearings of revolute joints on the system behavior. A computer program is constructed and applied to analyze a specific crank-lever 4-bar mechanism. The algorithm of the program is as follows. First, the natural frequencies and the mode shapes of the system are calculated by solving the eigenproblem of the mechanism system which can be considered as a static structure by assuming the input shaft (crank shaft) to be fixed at any given configuration of mechanism. And finally, the elasto-dynamic deformation of the whole system is obtained using mode superposition method for the case of constant input speed. The effect of geometric stiffness on the mechamism is included in the program with the axial forces of links obtained through the quasi-static displacement analysis. It is found that the geometric stiffness exerts an important effect upon the elasto-dynamic behavior of the flexible linkage mechanism. Elastic deformation of bearing lowers the natural frequencies of the system, resulting smaller elastic displacement at the mid-point of the links and bigger elestic displacement at the ends of the links than rigid bearing. The above investigation of flexible linkage mechanism shows that the effects of the elastic deformation of bearing on the mechanism should be considered to design the mechanism which satisfies more preciously the purpose and the condition of design.
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조선휘,김기식 대한기계학회 1982 대한기계학회논문집 Vol.6 No.4
This paper attempts to predict the stress concentration around the corner of rectangular inserts of different material of mechanical properties from the base material of the finite rectangular plate. The problem is analyzed through the FEM and photo-elastic experiment with the inclination angle of the insert as variable parameters. According to the experiments and the numerical analysis, the maximum stress concentration occurs at the point of tangential discontinuity of a insert. When the lain insert or opening was so inclined that the distance from the free end of the plate to a corner became minimum, the maximum stress concentration factor was found.
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[論文] 平板內의 直線 Crack tip 에서의 應力擴大係數에 關한 硏究
조선휘,조희복 한국자동차공학회 1982 오토저널 Vol.4 No.1
In this paper, the stress intensity factors at the crack tips in a finite plate having a straight crack with arbitrary lengths and directions are analyzed by means of Boundary Collocation<br/> Method in Cartesian coordinates under the following two cases.<br/> A) Case of only considering stress components at the boundary collocation points<br/> B) Case of considering the stress resultant at the boundary, in addition to case of (A) and analyzed by means of F. E. M.<br/> To certify the Boundary Collooation Method, the solutions of B. C. M. are compared with the solutions of F. E. M. and M.lsida on the infinite plate.<br/> Consequently, B. C. M. demonstrates the simplicity of input data preparation and the reduction of cpu time against F. E.. M.
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동력성능 향상을 위한 차량용 자동 변속기의 최적 변속비 및 변속 패턴 결정에 관한 연구
조선휘,류길하,김태용 대한기계학회 1990 대한기계학회논문집 Vol.14 No.6
본 연구에서는 차량의 가속성능, 일정시간후 도달거리, 추월 가속성능 등의 동력성능 향상과 차량 요구성능을 고려한 최적 감속비의 결정을 고찰하였다. 변속비 결정의 선행 연구로서 정해진 차량 제원, 엔진 성능과 정해진 변속기에 대하여 차량의 동력성능을 예측, 평가하는 연구의 수행이 요구된다. 이를 위하여 본 논문에서는 기 존의 차량에 대하여 동력 성능을 평가하는 시뮬레이션 프로그램을 개발하여 실차의 제 작과 시험에 앞서 그 동력 성능을 예측, 평가하고 또한 이를 바탕으로 최적 설계기법 에 의하여 엔진 특성을 고려한 변속기의 최적 감속비 및 변속패턴을 결정하는데 촛점 을 두었다. Performance of vehicles depends mainly on engine performance, transmission gear ration and shifting pattern. In this paper, determination method of gear ratios and shifting pattern for automatic transmission equipped vehicles has been proposed. Computer programs for gear ratio determination and shifting pattern decision using optimal design technique have been developed for the purpose of increasing vehicle acceleration performance. For preceding study, computer simulation of vehicle performance is carried out using numerical technique.
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조선휘,김기식,김영진 대한기계학회 1991 대한기계학회논문집 Vol.15 No.2
Determining the motion using optimal technique about traveling time and trajectory planning has been studied often in recent years, but the study of determining the optimal robot dimensions is rare, the authors attempt to find out the least driving torques and energy as the optimization of link length ratio referred to 2R SCARA and 3R robot manipulators. For the given linear path with triangular velocity profile, the inverse kinematic and dynamic problems are examined in order to lead into solution of problem, which is suggested for optimal design of link lengths. Accordingly, optimal link length ratio is obtained with respect to each case.
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