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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.