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모터사이클 엔진 시스템에서 볼 베어링의 접촉 모델링 기법
류한식(Hansik Ryu) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
In this paper, an analytical model is developed to describe the dynamic characteristics of a ball bearing in the motorcycle engine. In order to obtain accurate dynamic response of ball bearing, each ball is modeled as a rigid body which has radial and axial movement and rotational constraints. Beam element between outer race segments is used to consider flexibility of outer race. Beam deflection is calculated from beam forces and used for contact between ball and outer race. The contact surfaces of inner and outer race were represented by partial torus. The efficient contact search kinematics and algorithms in the context of the compliance contact model are implemented to detect the interactions between ball and race for the sake of speedy and robust solutions. Dynamic forces of balls and outer race are investigated from numerical results.
장정선(Jungsun Jang),류한식(Hansik Ryu),최진환(Jinhwan Choi),배대성(Daesung Bae) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
When the tracked vehicle is running on various types of terrain, the physical properties of the interacting ground<br/> can be different. In this paper, the interactions between track link and soft ground are investigated. Surfaces of a track<br/> link and triangular patches of ground are implemented for ground contact detection. Bekker’s model is applied for<br/> pressure-sinkage relationship and the shear stress-shear displacement relationship proposed by Janosi and Hanamoto<br/> is used for tangential shear forces. The repetitive normal loads of a terrain are considered because a terrain element is<br/> subject to the repetitive loading of the roadwheels of a tracked vehicle. The methods how to apply Bekker’s soil<br/> theory for multibody track system are proposed in this investigation. Contact force at each segment area of a track<br/> link is computed respectively by using virtual work concept.
평기어의 동적 해석 : 효율적 접촉 해석에 의한 접촉력
송인호(Inho Song),최진환(Jinhwan Choi),류한식(Hansik Ryu),배대성(Daesung Bae) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The prime source of vibration and noise in a gear system is originated from transmission error between the meshing gears. In this paper, the dynamic modeling method and response of a spur gear pair are investigated by using a detailed contact analysis at each time step. Input values such as time-varying mesh stiffness and static transmission error excitation are not required in this investigation because mesh forces are calculated by contact analysis. The efficient contact search kinematics and algorithms in the context of the compliant contact model are developed to detect the interactions between teeth surfaces. The compliant force model that is based on the Herzian law was used and the friction force are considered. Dynamic transmission error(DTE) and mesh frequency values are presented.
정은교(Eunkyo Jung),최진환(Jinwan Choi),류한식(Hansik Ryu) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_2
In this paper, an analytical model is developed to describe the dynamic characteristics of a roller bearing. In order to obtain accurate dynamic response of roller bearing. each roller is modeled as a rigid body, which has radial and axial movement and rotational constraints, Beam element between outer race segments is used to consider flexibility of outer race. Beam deflection is calculated from beam forces and used for contact between roller and outer race. The contact surfaces of inner and outer race were represented by cylindrical shape. The efficient contact search kinematics and algorithms in the context of the compliance contact model are implemented to detect the interactions between roller and race for the sake of speedy and robust solutions. Dynamic forces of roller and outer race are investigated from numerical results.
송인호(Inho Song),최진환(Jinhwan Choi),류한식(Hansik Ryu),배대성(Daesung Bae) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this paper, a simulation model is developed to describe the dynamic characteristics of the silent chain drive system in the automotive engine. In order to obtain accurate dynamic response of chain system, each chain link is modeled as a body which has six degrees of freedom. A compliant bushing element is used to connect chain links. The contact surface of the each geometry such as sprocket, guide, silent chain link were represented by various arcs and line segments. The efficient contact search kinematics and algorithms in the context of the compliance contact model are implemented to detect the interactions between chain links, chain guide, crankshaft sprocket, and idler sprockets for the sake of speedy and robust solutions. Dynamic tension, impact forces, and vibration of chain links are investigated from numerical results.<br/>