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송명의(Myungeui Song),임영훈(Younghun Lim),조희제(Huije Cho),배대성(Daesung Bae) 한국자동차공학회 2010 한국 자동차공학회논문집 Vol.18 No.1
The paper proposes a multi-body dynamic simulation to numerically evaluate the generated axial force(G.A.F) and plunging resistant force(P.R.F) practically related to the shudder and idling vibration of an automobile. A numerical analysis of two plunging types of CV joints, tripod joint(TJ) and very low axial tripod joint(VTJ), is conducted using the commercial program DAFUL. User-defined subroutines of a friction model illustrating the contacted parts of the outboard and inboard joint are subsequently developed to overcome the numerical instability and improve the solution performance. The Coulomb friction effect is applied to describe the contact models of the lubricated parts in the rolling and sliding mechanisms. The numerical results, in accordance with the joint articulation angle variation, are validated with experimentation. The offset between spider and tulip housing is demonstrated to be the critical role in producing the 3rd order component of the axial force that potentially causes the noise and vibration in vehicle. The VTJ shows an excellent behavior for the shudder when compared with TJ. In addition, a flexible nonlinear contact analysis coupled with rigid multi-body dynamics is also performed to show the dynamic strength characteristics of the rollers, housing, and spider.
볼 타입 등속조인트 케이지 강도의 역학적 영향인자 분석
송명의(Myeong-eui Song),임영훈(Young-hun Lim),안성백(Sung-beak An),이인상(In-sang Lee),김정윤(Jung-yun Kim) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Constant velocity joint is used for transmitting torque to wheel. Ball joint is popular to outboard type because it allows wheel to bend freely according to steering. Nowadays, the strength requirements of CVJ are being more complicated because of robustness against high engine power and the demand for flexible turning capability in small area. One of the CVJ strength evaluations is quasi-static torsion limitation test, which measures the fracture torque with maximum joint angle on ball joint. Cage web of ball joint determines most fracture strength of CVJ on the test. The study is performed in order to find the reason of cage web weakness with coupled dynamic analysis method. The study shows that firstly, contact force between ball and inner race track at large joint angle makes it between inner race and cage web amplified especially in from 120 to 150 revolution range. Secondly, the kinetic result of cage web’ contact posture for maximum joint angle shows that the phase from 145 to 215 has weak shear strength potential by contact pressure. Finally, the change of track which has bisymmetry shape joint along to shaft direction from joint center shows that the stress of web can be minimized and the strength is very sensitive to track shape
지지부의 유연성을 고려한 엔진 마운트의 동특성 해석 및 최적설계에 관한 연구
송명의(M.Y.Song),최동운(D.U.Choi),임홍재(H.J.Yim),김종현(J.H.Kim),이장무(J.M.Lee),류제하(J.H.Liu) 한국자동차공학회 1996 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1996 No.11_1
Using the equations of motion for the engine mount system including foundation flexibility, forced vibration analysis is carried out for the given engine mount system excited with the unbalanced force and moment using the program developed in this paper. A new optimal design method, in which modal frequencies of the supporting structure can be integrated as design variables, is presented.<br/>
전자빔 용접 수소 균열 가능성 평가와 균열 방지를 위한 용접 조건 최적화
송지민(Jimin Song),이상훈(Sang hun Lee),박승환(Seunghwan Park),송명의(Myeongeui Song) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
A hydrogen-induced crack is referred to as a crack that occurs at temperatures blow approximately 100 oC after solidification in welding. The Hydrogen-induced crack initiation is caused by the combined effects of high brittleness of the weld, residual stress (maximum principal stress) and diffusible hydrogen in the weld. The cooling rate affects the content of diffusible hydrogen in weld. It is generally recognized that a high cooling rate causes a higher hydrogen content. In this study, FE analyses and tests in various welding conditions were performed. T8/5 cooling rate and residual stress results are extracted and plotted on the plane coordinate to estimate the possibility of the occurrence of the hydrogen-induced crack.
서정호(Jungho Seo),송명의(Myong Eui Song) 한국자동차공학회 2022 한국자동차공학회 부문종합 학술대회 Vol.2022 No.6
It is important to predict vibration characteristic caused by T.E(Transmission Error) prior to whine noise analysis. This is because T.E is harmonic excitation source of whine noise. As the force due to the gear pair is transfer, the strain energy on gear train transfer to bearing and vibrate the surface of the case. The result of this process is the whine noise. So, the correlation of the vibration of surface is the essential. For this, it made NVH analysis model to predict surface vibration acceleration. And it figured out the effective parameter to change vibration characteristic of system with sensitivity analysis. Finally, it found the value that approximate experiment of parameters with D.O.E(Design of experiments) using Monte Carlo Method.
옵셋각 설계변수를 통한 등속조인트 케이지 강도 개선에 대한 연구
서정호(Jongho Seo),송명의(Myeongeui Song),김필기(Pilki Kim),민준호(Jun-ho Min) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
In order to achieve a robust design of CVJ (constant velocity joint), it is the most important thing to increase the fracture torque of the quasi-static torsional fracture test. The fracture torque is decided by the cage of the BJ(ball joint) composition and most broken position is the column of cage. For this reason, Offset angle method has been developed to improve the strength of the cage in this study. The thickness of the cage can be increased than an existing size by using the offset angle method. The fact means that the cage has an advantage for the strength. The analysis simulation on verification for the parameter of offset angle is composed of the strength part and the dynamic part in this study. As a result for the analysis simulation, the strength of the cage has improved 10% compare to the existing offset method. and, the quasi-static torsional fracture test has been carried with CVJ applied to the offset angle parameter. In this test, we identified that the fracture torque has been increased by 10% from existing products.
김기헌(Kim, Ki Hun),송명의(Song, Myung Eui),민준호(Min, Jun Ho) 대한기계학회 2013 대한기계학회 춘추학술대회 Vol.2013 No.12
Constant velocity joint(CVJ) creates the generated axial force (G.A.F) when the vehicle is driven. Because this phenomenon can give driver bad driving feeling, sensitive quality of vehicle is declined. Axial force at CVJ is generated by friction between parts of CVJ. In this study, cause of G.A.F of tripod typed CVJ (plunging type) is found by mechanical and dynamic analysis. A numerical analysis of CVJ is conducted using the Multi-body dynamic simulation program DAFUL.
EXCEL Code 와 시뮬레이션 기법을 이용한 고속 충돌 해석에 관한 연구
홍창우(Changwoo Hong),송명의(Myeongeui Song),민준호(Junho Min) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
A fast moving system’s fragments are produced during an unexpected event and it can be incurred an impact with the case of fast moving system(CFMS). To prevent the fragment of fast moving system from penetrating the CFMS, the collided body is required to design not to be penetrated using analysis of simulation method and test. In this study, the simulation of collision is performed by the explicit FEM software LS-DYNA. The material type used in CFMS is a Johnson and Cook model. The input parameters of flow stress and strain of fracture in Johnson and Cook model are calculated using EXCEL. The results of this simulation by EXCEL Code were verified by the results of Simplified Johnson and Cook model simulation.