離心泵是運用範圍廣泛的泵浦之一，包括傳統民生用途的農業灌溉、自來水輸送到現今的化工廠藥液定量泵、核能發電廠的鍋爐給水泵、廠房冷卻系統等。由於離心泵在許多的應用上都扮演著關鍵角色，維持離心泵在正常的運作狀態是非常重要的。因此本研究利用實驗方法，建造一個離心泵監測系統即時監控離心泵的工作狀態，進行流量、壓力、溫度、電流、震動等性能指標之監控，進一步作問題診斷與預測。根據離心泵常見的失效模式及特徵來設計離心泵失效實驗，以蒐集異常狀況時各參數的變化情形，以建立適當的監控指標來進行問題診斷與預測。首先，針對離心泵阻塞問題，建立流阻為其監控指標，並利用改變管徑的方式使流阻上升等效阻塞情況，進行阻塞狀態監控與預測。接著，磨損離心泵葉輪上所有葉片的高度來等效腐蝕或空蝕等效應對葉片的磨損，亦可以等效葉輪與泵殼間的間隙變化所造成的影響。最後，磨損離心泵中的部分葉片來呈現離心泵中不平衡的狀況，並觀察其震動變化。本研究結合實驗數據與理論背景，建立監控指標及方法來進行離心泵之問題診斷與預測，在失效發生前做好零件維護及更換。

Centrifugal pumps are used for many different purposes in a wide variety of industries, such as power generation plants, chemical processing plants, water supply, heating and cooling distribution systems. Centrifugal pumps often play an important role in the entire production or process chain, so timely detection of faults is crucial to enhance the production level as well as reducing unexpected cost. In this study, a monitoring system is constructed to timely keep track on the status of the pump, including the flow rate, pressure, temperature, current, and vibration. In addition, clogging experiments and impeller experiments are designed based on the failure causes and effects. There are three kinds of experiments conducted in this study. The first experiment is to mimic the clogging status by shrinking the cross-sectional area of outlet, which can equivalent to the rises in flow resistance. The second experiment is to discuss the degrees of wear impeller blades. The final experiment is to consider the unbalance effects by grinding different number of blades. By collecting the data from sensors and combining with the pump domain knowledge, fault diagnosis and prognosis can be made to deal with the faults. Furthermore, the criterion of maintenance or replacement strategies can be formulated for users to follow, thus helping the centrifugal pump work properly to reduce accidental costs.

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