熔裝固化鑄模內壁面接觸熱傳係數之逆向估算

An Inverse Analysis for Estimating Unknow Contact Conductance during Metal Casting

陳聰堅(Tsung-Chien Chen)

《中國航空太空學會學刊》 33卷3期 (2001/09) Pp. 209-215

https://doi.org/10.6124/TAASRC.200109_33(3).09

摘要

在熔裝固化過程中，鑄模內壁面與熔液交界面所產生的孔隙率將造成界面熱阻的存在，影響熱傳與固化的速率。本研究以線上逆向熱傳導解法，利用熱電藕量測鑄模外壁溫度，配合卡爾漫濾波技術觀念與最小平方法所推導之遞迴式輸入估算法測，即時估算鑄模與熔液界面間之接觸熱傳係數，函數個典型時變接觸熱傳係數估算分析與驗證結果，本法勿須量測整批溫度數據、不佔運算記憶空間且可有效、即時、精確估算接觸熱傅係數。

關鍵字

熔裝 ； 固化 ； 卡爾曼濾波技術 ； 遞迴式輸入估算法

並列摘要

The aft-gap formation between the casting and the metal mold during the casting of metals creates a thermal resistance that reduces the heat transfer and solidification rates. In this work, the on-line inverse solution methodology based on the kalman filtering technique and the recursive least-squares algorithm is developed for estimating the variation of unknown contact conductance with time from the temperature measurements taken with thermocouples at the outer mold surface. From computer simulation studies, we have demonstrated the effectiveness of this method in estimating some typical cases with time-varying contact conductance. The scheme is simple in concept and reduces the computational load in implementation drastically. The applications can be extremely useful in efficient and immediate identification of unknowns such as period contact conductance or heat flux.

並列關鍵字

casting ； solidification ； Kalman filtering technique ； recursive least-squares algorithm