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서재우,박형욱 한국생산제조학회 2022 한국생산제조학회지 Vol.31 No.5
High-speed machining is essential in the manufacturing field, and it involves the removal of material through rotational and translational tool motion. Existing methods used for simulating the thermomechanical behavior of spindle systems in machining require extensive calculations owing to the geometry complexity and thermomechanical properties. This article presents a simplified model of an angular contact ball bearing and a simulation method for predicting the thermomechanical behavior of a spindle system. A commercially available software, ANSYS, was used to analyze the coupled behavior. The Matrix27 element was adopted to substitute the stiffness/damping characteristics of the angular contact ball bearing. Validated values of the thermal contact conductance for the contact option were adjusted to match the measured thermal characteristics of angular contact ball bearings. Experimental measurements of the temperature and deformation of a spindle were used to verify the simulated results for several preload conditions.
서재우 ( Seo Jae-woo ),김일구 ( Kim Il-ku ),안기문 ( An Ki-mun ),이증빈 ( Lee Cheung-bin ),안종필 ( Ahn Jong-pil ) 한국구조물진단유지관리공학회 2008 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.12 No.1
Development of design method based on probability theory sublating discrepancy of definitive design standards in designing foundation structure is needed. This study develops uncertainties of resistance and load effect of foundation structures in order to introduce the concept of probabilistic design based on reliability into foundation structures, estimate reliability index suitable to foundation structures, compares and analyzes safety and durability performance.