| Summary: | 碩士 === 逢甲大學 === 機械與電腦輔助工程學系 === 107 === More than 70% proportion of machining error results from heat. Temperature distribution in spindle change dramatically in contrast with other components in machine tools. In addition, spindles play a crucial role in machining quality. Thermal behavior of spindles thus becomes the ongoing issue researched by academic and industrial. Heat source, bearing, is usually used as the condition which makes Finite Element Method solved or the quality standard for products. However, a mass of parameters for bearing makes heat source approximated difficultly. And also, it is unable to measure heat source by sensors immediately. Therefore, an inverse method is adopted to estimate heat source in different rotating speed and time period in this paper. In numerical verification, it is proved that heat source could be solved with 99.6% accuracy in 3 iteration. Furthermore, it could tolerate with 0.3℃ of normal distribution standard error by two measurement. Measurement intensity is also an important consideration of inverse method. In actual experiment, not only the magnitude of two heat source in different rotating speed and time period is calculated by two measurement as well, but the variation of dynamic preload could be observed by the result of inverse method.
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