迴轉式壓縮機噪音量測與診斷分析之探討

本論文主要針對一有異音產生之虞的迴轉式壓縮機進行診斷，實驗項目主要分為兩大部分，第一部分為接受端測試，分別針對壓縮機在穩態運轉狀態下進行穩態運轉測試，以及壓縮機由靜止到固定轉速狀態下進行啟動運轉測試，其目的主要為求得壓縮機結構的振動及噪音頻譜，並找出壓縮機主要噪音之貢獻頻帶，並搭配量測數據之後處理工具程式篩選出轉速倍頻以及找出結構可能的自然頻率；第二部分為路徑測試，其實驗項目分別有轉子角度不同之幾何影響、邊界重現性測試、實驗模態分析(EMA)以及操作模態分析(OMA)，目的為求得壓縮機外殼的模態參數，包含自然頻率、模態振型以及阻尼比。但由於單純只觀察壓縮機外殼之模態振型無法判斷其振動特性，因此針對壓縮機上之儲液瓶結構進行有限元素分析(FEA)，以了解儲液瓶內部結構的動態特性。並將所有實驗數據搭配儲液瓶結構有限元素分析之結果進行綜合比較，結果顯示迴轉式壓縮機之異音來源可能是來自儲液瓶內部之內管以及檔板的振動所產生。最後本論文針對迴轉式壓縮機噪音異常建立診斷分析流程，已建立符合業界實際需求之壓縮機噪音診斷程序與步驟，並建立長遠發展所需之技術能力。

關鍵字

接受端測試；路徑測試；實驗模態分析；操作模態分析；有限元素分析

並列摘要

This work aims to perform the diagnosis for the rotary compressor that is potentially noisy. Experiments for diagnosis are planned into two parts. First, the receiver test is carried out to measure the noise and vibration for the compressor in steady state test, i.e. running at constant speed, and run-up test, i.e. running from still to the rated rotating speed, respectively. The purpose of receiver test is to obtain the noise and vibration spectrum for the compressor and determine the possible noisy bands of frequencies. The post processing program is developed and used to identify the harmonics with respect to the rotating speed as well as possible structural resonant frequencies. Second, the path test is to perform experimental modal analysis (EMA) on the rotary compressor. The compressor in different rotor angles for geometry effect is considered as well as repeatability tests on boundary conditions. Both EMA and operational modal analysis (OMA) are, respectively, conducted on the shell structures of the compressor to obtain structural modal parameters, including natural frequencies, mode shapes and modal damping ratios. Also, the finite element analysis (FEA) is adopted to predict the modal properties of accumulator to realize the internal structural modal characteristics and assist to diagnosis the possible noisy sound. Results show the major compressor noise contribution comes from the resonances of the internal pipe of accumulator and the suction filter plate, respectively. This work lays out the noise diagnosis procedure and establishes the measurement and analysis methodology for the rotary compressor and can be beneficial to the industrial applications.

並列關鍵字

Receiver Test ； Path Test ； Experiment Modal Analysis ； Operational Modal Analysis ； Finite Element Analysis

參考文獻

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迴轉式壓縮機噪音量測與診斷分析之探討

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