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Frequency Related Verification of MPR Model of Elastomeric Bushing in Torsional Mode
이성범(Seong Beom Lee) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.12
Elastomeric bushings are structural elements that are used in automotive suspension systems. An elastomeric bushing is a hollow cylinder that is contained between an outer steel cylindrical sleeve and an inner steel cylindrical rod. The outer steel cylindrical sleeve is connected to the components of the suspension system and is used to transfer forces and moments from the wheel to the chassis. The elastomeric material reduces the shock and vibration in this connection. Dynamic simulations of the automotive suspension system involve the interaction between many components. The accurate determination of the transmitted forces and moments between the components, the motion of the components, stress in the components, and energy dissipation is affected by the quality of the bushing model. Several Pipkin-Rogers models have been proposed for the axial mode, radial mode, and torsional mode and modified Pipkin-Rogers models have been proposed for the axial mode and torsional mode. In this research, the modified Pipkin-Rogers model for the torsional mode was verified in a frequency-related rotational angle control test. The results showed that the moment outputs of the modified Pipkin-Rogers model were in very good agreement with those of the Pipkin-Rogers model in the sinusoidal rotational angle control test.
통합수영교실이 지적장애아동의 자아존중감과 사회성에 미치는 영향
이성범(Lee, Seong-Beom),황향희(Hwang, Hyang-Hee),이종민(Lee, Jong-Min) 한국체육과학회 2012 한국체육과학회지 Vol.21 No.3
This study aims to provide basic materials for researches such as program development or evaluation to facilitate swimming activity integrated by exploring self-concept and sociality with intellectual disability. The purpose of this study is to identify the effect of swim programs to integrate the activation for the children individual to enjoy and to provide opportunities of the physical movement. Nine were chosen for the control group with only disabled children. Based on analysis of a swimming activity integrated on physical self-concept and sociality with intellectual disability children using the above method the following results have been produced. First, the program swimming integrated was higher in both self-concept and sociality with intellectual disability children. Between sub-factors of self-concept, self-concept general, self-concept in the school, and self-concept social showed significantly affect, but self-concept at home has not difference between the experimental group and the control group. Second, it appears to be statistically significant sociality in the mixed swim class with intellectual disabilities. There has been an increase in sociability from pre-intermediate to post- test at each stage. The meaning of these results for the program swimming integrated showed positive effects in the sociality both the class mixed with non-disabled children and children with disabilities and the class only disables children. Third, the swim classroom integrated was significantly different in self-concept of children between mixed group and only with intellectual disabilities. Mixed group were a higher in self-concept. The program swim integrated is able to affect self-concept both mixed group and only with disabilities, but appeared to be affection more mixed group. Forth, the swim classroom integrated was significant in sociality for children intellectual disability. The sub-factor of sociality: socialization, communication and self-help can be seen all statistically higher, but the factor of mobility has not difference between the groups.
비선형 점탄성 부싱모델에 대한 주파수와 변위의 영향에 대한 연구
이성범(Seong Beom Lee),김성진(Sung Jin Kim) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A bushing is a device used in automotive suspension systems to reduce the load transmitted from the wheel to the frame of the vehicle. A bushing is a hollow cylinder, which is bonded to a solid steel shaft at its inner surface and a steel sleeve at its outer surface. The relation between the force applied to the shaft and the relative deformation of a bushing is nonlinear and exhibits features of viscoelasticity. A force-displacement relation for bushings is important for multibody dynamics numerical simulations. For the nonlinear viscoelastic axial response, Pipkin-Rogers model, the direct relation of force and displacement, has been derived from Lianis model and the sinusoidal input was used for Pipkin-Rogers model, and the affection of displacement with frequency change was studied with Pipkin-Rogers model.<br/>
비선형 점탄성 부싱모델의 회전방향모드에 대한 실험적 연구
이성범 ( Seong Beom Lee ),이성재 ( Sung Jae Lee ),전성철 ( Sung Chul Jun ),송동률 ( Dong Ryul Song ),정재영 ( Jae Young Jeong ),박찬석 ( Chan Seok Park ),이우현 ( Woo Hyun Lee ) 한국고무학회 2008 엘라스토머 및 콤포지트 Vol.43 No.1
자동차 부싱은 차체로 전달되는 하중을 줄여주는 역할을 하는 자동차 현가장치의 주요부품으로 바깥쪽 슬리브와 안쪽의 축 사이에서 가운데가 비어 있는 실린더의 형상을 가진다. 차축에 작용되는 힘과 모멘트에 대한 부싱의 상대변위 및 변형각도는 점탄성 성질을 나타내며, 부싱에서 힘과 모멘트와 이에 대한 변위와 변형각도의 관계는 다물체 동역학 시뮬레이션에 매우 중요하다. 본 연구는 자동차 부싱의 회전방향 모드에 대한 모멘트와 변형각도의 점탄성 관계를 변형각도에 의존하는 모멘트 완화함수를 통하여 부싱모델을 완성하였으며, 완성된 점탄성 부싱 모델은 회전방향 모드에 대한 실험값과 비교하여 검증하였다. A bushing is a device used in automotive suspension systems to reduce the load transmitted from the wheel to the frame of the vehicle. A bushing is a hollow cylinder, which is bonded to a solid steel shaft at its inner surface and a steel sleeve at its outer surface. The relation between the force and moment applied to the shaft and the relative deformation and rotational angle of a bushing exhibits features of viscoelasticity. Since a moment-rotational angle relation for a bushing is important for multibody dynamics numerical simulations, the simple relation between the moment and rotational angle has been derived from experiment. It is shown that the predictions by the proposed moment-rotational angle relation are in very good agreement with the experimental results.
이성범(Seong Beom Lee),장왕진(Wang Jin Jang),한창용(Chang Yong Han),정재영(Jae Young Jeong) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
A bushing is a device used in automotive suspension systems to reduce the load transmitted from the wheel to the frame of the vehicle. A bushing is a hollow cylinder, which is bonded to a solid steel shaft at its inner surface and a steel sleeve at its outer surface. The relation between the force and moment applied to the shaft and the relative deformation and rotational angle of a bushing exhibits features of viscoelasticity. Simulation of the automotive suspension system involves the interaction between many components. The accuracy of the bushing modeling affects the accurate determination of the transmitted loads among components, the motion of the components, the stresses in the components, and energy dissipation. Rotational angle-dependent moment relaxation function was obtained and expressed as the explicit combination of time and rotational angle. The viscoelastic model for torsional mode was obtained and the results of the viscoelastic model was compared with the experimental results.
Modified Pipkin-Rogers Modeling of Elastomeric Bushing in Axial Mode
이성범(Seong Beom Lee) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.9
Elastomeric bushings are structural elements used in automotive suspension systems. A bushing is a hollow cylinder between an outer steel cylindrical sleeve and an inner steel cylindrical rod. The steel sleeve is connected to components of the suspension system and transfers forces from wheel to chassis. Force-Displacement relation for elastomeric bushings is critical for multi-body dynamics simulations. A boundary value issue for bushing response leads to force-displacement relation that requires extensive computation time to implement and therefore is unsuitable. Explicit force-displacement relation may be used in multi-body dynamics simulations. The relation is expressed in terms of a force relaxation function. Lianis model, Modified Lianis model, and Pipkin-Rogers model are introduced. Modified Pipkin-Rogers model was proposed and a boundary value issue was formulated for axial mode bushing response. Numerical solutions of the boundary value issue of Modified Pipkin-Rogers model were compared with results of the Pipkin-Rogers model. It is revealed that the method for determining bushing relaxation function and prediction of proposed force-displacement relation is in agreement with the original results.
이성범 ( Seong Beom Lee ),염상훈 ( Sanghoon Yeom ),한창용 ( Chang Yong Han ),우창수 ( Chang Su Woo ) 한국고무학회 2012 엘라스토머 및 콤포지트 Vol.47 No.3
그로멧은 자동차의 고무부품들 중의 하나로 에틸렌 프로필렌 고무로 구성되어 있으며, 고무의 비선형 초탄성 성질은 고무제품의 거동을 예측하는데 중요하다. 본 논문에서는, 일축인장시험과 이축인장시험을 통하여 안정된 응력-변형률 관계를 구하고 그로멧에 대한 유한요소해석을 수행하였고, 수명예측을 위한 노화시험을 소개하였다. Grommet is one of the Automotive rubber components and is made from EPDM(Ethylene Propylene Diene monomer M-class) rubber and the nonlinear hyperelastic material properties of rubber are important to predict the behaviorof rubber product. In this study, the stable stress-strain relations were obtained from the uni-axial tension test and theequi-biaxial tension test. Finite element analysis for grommet was carried out and heat aging test for the lifetime predictionof grommet was introduced.