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등가정하중을 이용한 구조최적설계 방법을 이용한 비선형 거동 구조물의 최적설계
박기종(K. J. Park),박경진(G. J. Park) 한국정밀공학회 2004 한국정밀공학회 학술발표대회 논문집 Vol.2004 No.10월
Nonlinear Response Optimization using Equivalent Static Loads (NROESL) method/algorithm is proposed to perform optimization of non-linear response structures. It is more expensive to carry out nonlinear response optimization than linear response optimization. The conventional method spends most of the total design time on nonlinear analysis. Thus, the NROESL algorithm makes the equivalent static load cases for each response and repeatedly performs linear response optimization and uses them as multiple loading conditions. The equivalent static loads are defined as the loads in the linear analysis, which generates the same response field as those in non-linear analysis. The algorithm is validated for the convergence and the optimality. The function satisfies the descent condition at each cycle and the NROESL algorithm converges. It is mathematically validated that the solution of the algorithm satisfies the Karush-Kuhn-Tucker necessary condition of the original nonlinear response optimization problem. The NROESL algorithm is applied to two structural problems. Conventional optimization with sensitivity analysis using the finite difference method is also applied to the same examples. The results of the optimizations are compared. The proposed method is very efficient and derives good solutions.
[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