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주현승(Hyunseung Joo),이경택(Kyoungteak Lee),고형규(Hyunggyu Ko) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
The Seat Back latch system is used in the vehicle rear seat back. This latch system must be guaranteed the high strength to prevent seat back folding on the rear impact situations. And this latch system must be satisfied with both the reinforced safety regulations and the profitability of components supplier. So the latch core parts should be optimized within limited design form. To develop this latch core parts, it is necessary to estimate of the characteristics of the proper materials, heat-treatment and the design process from the FEM. In this study, The strength of variable core design were measured by FEM, the optimized design was verified by real test. The result of this study present the seat back latch core part design and it could be used production.
임종윤(Jongyun Lim),이창수(Changsoo Lee),김도형(Dohyeong Kim),주현승(Hyunseung Joo),김헌영(Heonyoung Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Weather strips in automotives protect not only wind, dust and water leakage but also noise from exterior environment. Weather strips are suitable to reduce noise from high frequency range over 1 ㎑. Because seals of weather strips have too many resonant modes in this frequency region, SEA approach is better candidate than general FEM/BEM approaches. With deformed geometries from non-linear deformation analysis using FEM, SEA structural subsystems according to thicknesses were modeled. Also several internal cavities between seals as well as source and receiver cavities were modeled as SEA acoustic subsystems. The results from acoustic response of receiver cavity were compared with test. Good agreements between analysis and test were reached in frequency range over 1.6 ㎑ or 1 ㎑. Although it is difficult to apply this SEA approach to geometry change in detail, acoustic performance can be predicted according to types, thicknesses, materials and clear change of geometry.