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차량 도어 시스템의 FEM-EMA Correlation 연구
최재민(Jaemin Choi),전인기(Inki Jun),조미희(Mihee Cho),전오환(Ohhwan Jeon),지성호(Sungho Ji) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The object of this paper is to develop the application method of FEM-EMA correlation and validation techniques to automotive door system for evaluating the vibration effect of door speaker. Recently the door assembly has inner module panel and powerful speaker system to raise their capacity as that result the vibration problem occurred to the door trim. A FE modal analysis and a multi-point experimental modal analysis (EMA) of door assembly are compared with a classical comparing method, MAC (Model Assurance Criteria). In additional in this paper, modeling technique in the mounting area is considered to update dynamic characteristics of the system. Several linkage method and boundary condition are applied to FE model, finally most effective method is suggested for raising the accuracy of FE model and the corrected FE model is set.
승용차용 현가시스템의 동하중 저감을 위한 다중 목적함수 최적설계
김용연(YongYun Kim),허승진(SeungJin Heo),김민수(Min-Soo Kim),전인기(InKi Jun),최재민(JaeMin Choil) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this study, a virtual simulation is conducted using the Virtual Proving Ground. The roads used in the simulation are Belgian roads and single lane roads. These two particular roads are simulated using the VPG technique. Through the simulation, the dynamic load on each component is estimated, and means by which the estimated dynamic load can be decreased is determined. At the time of optimum designing such as this, many objective functions may exist, therefore, multi objective function technique is used for the optimum design. Also, by evaluating the control stability of the model with optimum design and the existing model, the control stability performance of the optimum design model was verified.
체결부 및 공차를 고려한 구조물의 확률기반 동적 특성 연구
원준호(Junho Won),강광진(Kwangjin Kang),최주호(Jooho Choi),최재민(Jaemin Choi),전인기(Inki Jun) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
Structural noise is a significant problem in many multi-part or multi-component assemblies. In general, structural noise originates at the location of various fasteners, such as bolts, snap, hinge, weld or other fastener or connector (collectively “fasteners”). Such noise characteristics are almost always undesirable, and for this reason, prediction and prevention of noise source characteristics is important. For the exact prediction of noise source characteristics, a study of the structure’s dynamic characteristics is required. However, the current state of the art does not provide an analytical tool to effectively predict structure’s dynamic characteristics, because consideration of structural uncertainties (i.e. material properties, geometric tolerance, dimensional tolerance, environment and so on) is difficult and very small fasteners in the structure cause a huge amount of analysis time to predict dynamic characteristics using the FEM (finite element method). In this study, to resolve the current state of the art, a new approach is proposed using the FEM and probability analysis. Firstly, equivalent elements are developed using simple element (e.g. bar, beam, mass) to replace fasteners’ finite element model. Developed equivalent elements enable to explain static behavior and dynamic behavior of the structure. Secondly, probability analysis is applied to evaluate the PDF (probability density function) of dynamic characteristics due to tolerance, material properties and so on. MCS (Monte-Carlo simulation) is applied. Proposed methodology offers efficiency of dynamic analysis and reality of the field. Also, proposed methodology becomes basis of noise source prediction. Numerical examples are shown using simple plates joined by fasteners.