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중형트럭 현가계의 설계변수 변화에 따른 피칭운동이 민감도 해석
이희범(H.B.Lee),이기호(G.H.Lee),김태식(T.S.Kim),손한규(H.G.Sohn) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_2
Ride quality of medium truck became an important item, due to increase the standard of life style. This study describes how to determine and evaluate design parameters related to chassis suspension system through time and frequency analysis. The spring stiffness and damping force of the chassis suspension system were obtained by the magnitude of the vertical acceleration PSD. The simulation was carried out on the various road profile, which is suggested by ISO. The body pitching of medium truck item which should be studied for ride quality. We made truck model by use of DADS, which is dynamic analysis software, in order to find out the truck motions. From the results of sensitivity analysis of suspension parameters,we found out that, the spring and shock absorber affect the pitching of the medium truck. In order to truck model validation, We carried out actual test.<br/>
그라프트화 전분의 제조 : 중합방법에 따른 스티렌 그라프트 효율
조창기,이기호,우상원,황승식,최종범 ( C . G . Cho,K . H . Lee,S . W . Woo,J . B . Choi,S . S . Hwang ) 한국공업화학회 1997 공업화학 Vol.8 No.5
전분의 친수성 및 반응성을 조절하기 위하여 propylene oxide, 1,2-epoxybutane, glycidyl methacrylate, maleic anhydride, caprolactone 등을 반응시켰으며 건조되지 않은 전분을 사용할 경우 propylene oxide, maleic anhydride 외에는 반응 수율이 아주 낮아지는 것이 관찰되었다. 이렇게 개질된 전분을 스티렌과 반응시켜 그라프트 공중합물로 전환하였으며 여러가지 중합방법에 대한 그라프트 수율이 비교되었다. 그라프트 중합반응의 경우 용액중합 및 cerium(IV)이온에 의한 중합은 각각 낮은 효율과 수율을 보였다. 현탁중합 방법으로는 전분 입자의 친수성 때문에 폴리스티렌으로 전분을 encapsulation 하기가 어려웠으며, 유화중합이 스티렌을 그라프트 시키기에 제일 적당한 방법임을 알 수 있었다. The corn starch was treated with propylene oxide, 1,2-epoxybutane, glycidyl methacrylate, maleic anhydride, caprolactone, respectively, in order to alter the hydrophilicity and the reactivity of starch. When the starch was not dried, poor reaction was observed except the reaction with propylene oxide or maleic anhydride. The treated starches were grafted with styrene by several different polymerization methods. Solution polymerization and redox polymerization using cerium(IV) ion show poor grafting efficiency and poor yield. Encapsulation of starch with polystyrene by suspension polymerization was difficult due to the hydrophilicity of the starch. Among the examined methods, emulsion polymerization was found to be the suitable way to graft styrene onto starch.
소형버스의 동역학 해석을 위한 판스프링 모델링기법 개발
박태원(T. W. Park),임홍재(H. J. Yim),이기호(G. H. Lee),박찬종(C. J. Park),정일호(I. H. Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
A leaf spring plays an important role in a passenger bus. Since characteristic of a leaf spring has a hysteresis behavior, a modelling technique for a leaf spring is an imPortant issue for a passenger bus analysis. In this paper, modelling technique for a leaf spring is presented. First, non-linear FEM model of a leaf spring is constructed then it is used to make an approximated model to be used in dynamic analysis. The modelling procedure is explained in step by step approach. Then. this model is applied to mini-bus dynamic analysis with flexible body and non-linear dynamic force element and the results are compared with test data.<br/> <br/>
박태원(T. W. Park),임홍재(H. J. Yim),이기호(G. H. Lee),박찬종(C. J. Park),정일호(I. H. Jeong) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Ride harshness is the important characteristic for a passenger bus. Since ride generally involves frequencies up to 30 Hz, special modelling technique should be used for ride harshness analysis. This paper investigates modelling technique of a passenger bus for ride analysis which involves coupling of rigid bodies and flexible bodies in one model. First step is to build a rigid model and next step is to establish FEM model of a bus body and leaf springs. Then, prepared FEM model is coupled with the rigid model Computational results of the coupled bus model is compared with the testing results. Then, sensitivity analysis was carried out to suggest the direction for the ride quality improvement.<br/> <br/>