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標題: | 工具機主軸之熱網路系統參數識別與藍牙溫度感測模組 Parameter Estimation of the Thermal Network Model of a Machine Tool Spindle by Bluetooth Temperature Sensor Module |
作者: | Yuan-Chieh Lo 羅元玠 |
指導教授: | 張培仁(Pei-Zen Chang) |
關鍵字: | 熱網路模型,系統識別,工具機主軸,參數估計,熱特徵預測,藍牙溫度感測模組, Thermal network model,System identification,Machine tool spindle,Parameter estimation,Predictive thermal characteristic,Bluetooth temperature sensor module, |
出版年 : | 2017 |
學位: | 碩士 |
摘要: | 高速切削技術之發展過程中,工具機主軸的熱特徵為提升加工精度之重要參數。本研究以熱網路分析模型為基礎,採用系統識別法建構工具機主軸之暫態和穩態熱預測模型。硬體層面自行研發具高穩定度與高精度的溫度感測無線傳輸模組,以及適用於實驗量測之三種溫度探頭:(1)磁吸式、(2)螺紋式、(3)探棒式。模組測試結果已達到:精準度 ±(0.1+0.0029|t|)℃、解析度0.00489℃、功率為7 mW、模組尺寸Ø40×27mm3。內嵌數個微型溫度感測探頭於主軸之溫度特徵點(如:軸承外環、心軸、主軸表面、…等),設計於不同操作轉速及初始條件下量測溫升降曲線。軟體層面歸納主軸熱傳導特性,依據理論及經驗公式推導簡化與轉速相關之領導項,建構參數化熱模型。續搭配灰箱參數估測與實驗量測結果,實現主軸熱預測模型。經實驗證實此一熱模型識別法適用於工具機主軸溫度預測,即使在不同操作轉速以及初始溫度條件下,熱預測模型皆與實驗溫度數據吻合,吻合度達94.2%以上。同時應用系統降階法將主軸熱預測模型簡化,大幅減少數據運算量,以符合微處理器之運算能力,企圖實現邊緣運算(edge computing)之藍圖。 Thermal characteristic analysis is essential for machine tool spindles because sudden catastrophic failures may occur due to the unexpected thermal issue. This article presents a lumped-parameter thermal network model and parameter identification scheme, including hardware and software, to characterize both the steady-state and transient thermal behavior of machine tool spindles. For the hardware, the author develops a Bluetooth temperature sensor module which accompanying with three types of temperature-sensing probes (magnetic, screw, and probe). Its specification, through experimental test, achieves to the precision ±(0.1+0.0029|t|) ℃, resolution 0.00489 ℃, power consumption 7 mW, and size Ø40×27 mm3. For the software, the heat transfer characteristics of the machine tool spindle correlative the rotating speed are derived based on the theory of heat transfer and empirical formula. The predictive thermal network model of spindles was developed with the grey-box estimation and experimental results. Even under such complicated operating conditions as various speeds and different initial conditions, the experiments validate that the present modeling methodology provides a robust and reliable tool for the temperature prediction with 94.2% agreement, and the present approach is transferable to the other spindles with similar structure. For realizing the edge computing in smart manufacturing, a reduced order thermal network model is constructed by model order reduction technique and implemented into the real-time embedded system. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/77737 |
DOI: | 10.6342/NTU201702645 |
全文授權: | 未授權 |
顯示於系所單位: | 應用力學研究所 |
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