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체비셰프 배열법과 핀홀 모델을 이용한 구와 밀폐형 캡슐의 자유진동 해석
안재현(Jeahyoen An),양정태(Jungtae Yang),이진희(Jinhee Lee) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
A free vibration analysis of hollow sphere and hermetic capsule was presented. Moderate thick shell theory was used and spherical shells were modeled as truncated spheres where there were pinholes at their apices. Hermetic capsule was modeled by a cylindrical shell capped by hemispherical shells at its ends. The deflections and the rotations of shells were represented by the expansions of Chebyshev polynomials and Fourier functions. The equations of motion were collocated to yield the system of equations that corresponded to the circumferential wave number. The numbers of collocation points were chosen to be less than the number of expansion terms, and the sets of algebraic equations were condensed so that the number of expansions matches the number of degrees of freedom of the problem. To satisfy the compatibility conditions between shell segments in the hermetic capsule the expansions were matched at the junctions of the substructures. Numerical example were provided to demonstrate the robustness of proposed method.
시트 컴포트 해석을 이용한 백셋 및 허리지지대 돌출량 예측
최선우(SunWoo Choi),김석환(SeokHwan Kim),편종권(JongKwon Pyun),양정태(JungTae Yang) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
A new approach in seat comfort evaluation is proposed by comfort analysis, which is a new analytic method based on the materializing seat model. As a result of application of analysis model, we could compose the model which can predict the backset of head restraint and lumbar support prominence.
황수환(Suhwan Hwang),김석환(Seokhwan Kim),이광노(Kwang-Noh Lee),편종권(Jong-Kweon Pyun),김진규(Jinkyoo Kim),송명준(Myungjoon Song),양정태(Jungtae Yang),이인혁(Inhyeok Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Many engineers are trying to predict seat comfort, but these predictions are very difficult. The automobile seat is composed of the foam with the frame. Lumbar support is very important part in car seat, also. Using data from a seat material property, pam-comfort program finds the factor that we will make a major parameter of seat comfort. On the basis of result knowledge of the analysis, we can evaluate the seat comfort factor and find the best way to solve it. Simulation program will be used to predict major parameter to seat comfort.