[동력전단계부문] 안전도를 고려한 전동 틸트/텔레스코픽 조향주의 해석 및 설계

신문균(S.W. Hong),홍성수(M.K. Shin),박경진(G.J. Park),우덕현(D.H. Wuh) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

The design process of the motor driven tilt/telescopic steering column is established by axiomatic design approach in conceptual design stage. By selecting independent design variables for improving performances steering system, each detailed design can be carried out independently. In the detailed design, the safety for crash environment and vibration reduction are considered. An occupant analysis code SAFE(Safety Analysis For occupant crash Environment) is utilized to simulate the body block test. Segments, contact ellipsoids and spring-damper elements are used to model the steering column in SAFE. The model is verified by the result of the body block test. After the model is validated, the energy absorbing components are designed using an orthogonal array. Occupant analysis are performed for the cases of the orthogonal array. Final design is determined for the minimum occupant injury. For vibrational analysis, a finite clement model of the steering column is defined for the modal analysis. The model is validated by the vibration experiment. Size and shape variables are selected for the optimization process. An optimization is conducted to minimize the weight subjected to various constraints.

접촉이론을 이용한 승객거동해석 소프트웨어용 접촉력의 계산

신문균(M.K.Shin),임재문(J.M.Lim),박경진(G.J.Park) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_2

The contact force between the dummy and the interior parts of the car is the important index that affects the behavior of the dummy. The contact algorithm for the occupant analysis software is enhanced by a contact theory which is an extension of the Hertz equation in plastic range. Young's modulus and the Poisson's ratio are used for the explicit equations. The contact force can be estimated without the force-deflection function from experiments.<br/>

[SAFETY 부문] 충돌문제에 MDO를 적용하기 위한 시스템해석

신문균(M.K. Shin),김창희(C.H. Kim),박경진(G.J. Park) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Multidisciplinary design optimization (MDO) technology has been proposed and applied to solve optimization problems where multiple disciplines are coupled. A large system is decomposed into a set of smaller subsystems according to the related disciplines. Mostly, the MDO technology has been applied to aircraft wing design problems. In this research, an MDO problem is defined for the automobile design which has crashworthiness analyses. Belt integrated seat (BIS) is selected as a practical example. The design of BIS has two disciplines of crashworthiness based on nonlinear finite element analysis and occupant analysis based on multi-body dynamics. The problem is formulated for concurrent subs pace optimization (CSSO) which is one of the well defined MDO solution paradigms. System analysis in CSSO is very important in that the coupling between disciplines is solved through the system analysis. System analysis is conducted for the BIS design. Response surface method (RSM) is employed to solve the system analysis because involved disciplines are too complicated to use the mathematical optimization. That is, the coupling variables are found by minimizing the discrepancy between the two disciplines. The performance of the system is evaluated and the full application of MDO technology to BIS is discussed.

성장중인 수흰쥐의 거세가 혈청LH 와 FSH수준 , 체중 및 정낭중량에 미치는 영향

신문균,정영채,김창근,정영호,김형태 ( M . K . Shin,Y . C . Chung,C . K . Kim,Y . H . Chung,H . T . Kim ) 한국축산학회 1982 한국축산학회지 Vol.24 No.3

The purpose of this experiment was to investigate the effects of castration on serum LH and FSH level, body weight and seminal vesicle weight in growing male rats. The animals used in this experiment were 60 male rats of Wister Imamichi strain weighing 93.03±4.02g at 42 days of age. Five rats from each group were randomly sacrificed on the day of castration and at 1st, 2nd, 3rd, 4th and 5th week after castration. Seurm eras separated from the blood which was obtained by cardiac puncture and the serum was assayed for LH and FSH level by radioimmunoassay. Changes of the body weights were measured before sacrificing. Seminal vesicles were removed after obtaining blood and the weights were measured. The results which were obtained in this experiment were as follows: 1. Serum LH levels in castrated groups were increased gradually after castration and after 2 weeks of castration the levels were increased significantly (P$lt;0.05) as compared with the intact control groups. After 3 weeks of castration the serum LH level began to decrease and then maintained the same level to 5 weeks after castration. However, the serum LH level in the castrated groups were higher than those of the intact control groups at all periods. 2. Serum FSH levels in castrated groups were greatly increased after 1 week of castration. But the level began to decrease after 2 weeks of castration and got back to the level of the day of castration after 5 weeks of castration. The serum FSH levels in the castrated groups were higher than those of the intact control groups at all periods. 3. There were no differences in the both groups at 2 weeks of castration in body weights of growing male rats. From 3 weeks to 5 weeks after castration the body weights of the castrated groups were increased less than those of the intact control groups. 4. The weights of seminal vesicles in the castrated groups began to decreased from the first week of castration. After 4 weeks of castration the weights of seminal vesicles were significantly decreased (P$lt;0.05) and at 5th week after castration the weight of seminal vesicles were significantly decreased in the castrated group (P$lt;0.01) as compared with intact control group.

[論文] 승용차 충돌시 승객해석을 위한 모델링의 예

신문균(M.K.Shin),박경진(K.J.Park),이완익(W.I.Lee),김형중(H.J.Kim),정근섭(K.S.Jung) 한국자동차공학회 1992 오토저널 Vol.14 No.2

Real automobiles have been utilized to study the occupant behaviors and the response of the structures in the crash environment. Since various parameters are involved in the automobile crashworthiness, a number of experiments must be conducted. The experiments have been con­tributed to increasing the cost due to the fact that the test is quite expensive. Therefore, com­puter simulation is adopted to reduce the number of experiments. A few computer programs have been developed specifically to solve the occupant responses in the crash environment. In this research, a software is used to study the occupant dynamic analysis. A modeling of occupant analysis is established for a passenger car and the results are verified through comparisons with real experiments. In the modeling, data are tuned very carefully so that the simulated results such as HIC (Head Injury Criterion) and acceleration of each body may approximate to the experimental results. The compared experiment is a barrier test which is carried out by frontal impact. A feedback to the design process is suggested from the result of this research.

[안전/타이어운동특성부문] 승객거동해석을 이용한 후방 추돌시 목 상해를 줄이기 위한 좌석설계

신문균(K.Park),박기종(M.K.Shin),박경진(G.J.Park) 한국자동차공학회 1999 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

Occupant injury in rear end impact is rapidly becoming one of the most aggravating traffic safety problems with high human suffering and societal costs. Although rear end impact occurs at relatively low speed, it may cause permanent disability due to neck injuries resulting from an abrupt moment, shear force, and tension/ compression force at the occipital condyles. The analysis is performed for a combined occupant-seat model response, using the SAFE(Safety Analysis For occupant crash Environment) computer program. The computational results are verified by those from sled tests. A parameter study is conducted for many physical and mechanical properties. Seat design has been performed based on the design of experiment process with respect to five parameters seatback upholstery stiffness, torsional stiffness of the seatback, headrest upholstery stiffness, the clearance between occupant' s head and the headrest, and friction coefficient of the seatback

[SAFETY 부문] 반응표면법을 이용한 충돌 부품의 최적설계

홍을표(U.P. Hong),신문균(M.K. Shin),박경진(G.J. Park) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

An occupant analysis has been established for automobile crash environment, efforts are put on the reflection of the analysis of result onto the design process. Optimization is an excellent technology for the automobile design. However, the traditional gradient based optimization has many difficulties since the responses from the occupant analysis are not appropriate mathematically. Therefore, approximate or heuristic methods are utilized for the design. In this research, a response surface method (RSM) is applied for the design of parts involved in the occupant safety. Generally, an RSM generates response surfaces with selected design points. However, the selected algorithm makes better response surfaces as the iteration proceeds. An RSM in a commercial code is utilized by interfacing an in-house occupant analysis program called SAFE(Safety Analysis for occupant crash Environment). The design results are analyzed as opposed to those from the gradient base optimization and design of experiment (DOE).

트럭 장착용 너클크레인의 경량화를 위한 구조 최적설계

임헌봉(H.B. Lim),양현익(H.I Yang),신문균(M.K. Shin) 한국생산제조학회 2011 한국생산제조시스템학회 학술발표대회 논문집 Vol.2011 No.4

국내에서 너클크레인의 설계는 단순 외팔보를 가정한 수치계산에 의한 설계 해석과 소재변경을 통한 강성의 강화 등의 단순설계 방식으로만 수행되고 있다. 본 연구에서는 크레인의 전체 모델을 유한요소화하여 “Optistruct9.0”을 이용한 유한요소 해석을 수행하고, 경량화를 위하여 극단적 하중 조건인 최대 반경에서의 최대 하중을 적용한 구조 최적화를 수행하였다. 결과적으로 과도화된 초기 설계의 강도를 기준 강도에 허용하도록 하였으며, 전체 체적을 감소시킴으로써 중량의 감소를 이루었다.