- 學位論文
空調機系統振動噪音量測診斷程序之發展
Development of Noise and Vibration Measuremt and Diangosis Procedure for Air Conditioner System
摘要
迴轉式壓縮機安裝於空調機系統匹配之振動噪音問題，一直是業界所關心與注重的課題之一，找出空調機系統結構所產生的振動噪音來源與改善，為目前廠商極力解決之重點項目。本文主要目標在於發展空調機系統振動噪音診斷程序，首先介紹振動與噪音的量測方法，包含收受端測試(Receiver test, R- test)及路徑端測試(Path test,P- test)，並探討了空調機系統內部結構路徑，其吸入口與吐出口銅管為主要有興趣研究區域，且進行P-test透過實驗模態分析(EMA)求得結構振動特性。接著探討空調機之噪音特性，發現吸入口與吐出口銅之振動模態有其關聯性，並採用有限元素分析(FEA)對吸入口與吐出口銅管進行路徑分析(Path-analysis)建立吸入口與吐出口銅管之有限元素模型，透過EMA之實驗結果校準其管路系統模型。結果顯示，管路系統模型以三維樑元素(BEAM) 與三維線性立方體元素(SOLID)分別建立有限元素模型，都能有效的適當模擬吸入口與吐出口銅管之振動特性。且最重要的是可以觀察顯示管路系統結構之模態振型，可據與輔助空調機系統之振動噪音診斷。
並列摘要
The rotary compressor is installed within the air-conditioner system, and the related noise and vibration resulting from the assembly effect can be of concern. Finding the source and the resolution of noise and vibration in the air-conditioner system is a critical issue. This work aims to develop the noise and vibration diagnosis procedure for the air-conditioner system. The noise and vibration measurement is first introduced, including both the receiver test (R-test) and path test (P-test), respectively. The structural paths in the air-conditioner system are discussed, and the inlet and outlet pipes are the primary interest parts that are conducted by P-test, i.e. experimental modal analysis (EMA), to investigate structural vibration characteristics. The emitted noise from the air-conditioner is studied and found correlated to those pipe’s vibration modes. The P-analysis, i.e. finite element analysis (FEA) on the inlet and outlet pipes is also conducted to build up the analytical FE models and calibrate the pipe system models via EMA. Both BEAM and SOLID element models are, respectively, constructed and shown effective to simulate the inlet and outlet pipe properly. Importantly, the structural mode shapes of the pipes can be visualized to assist noise diagnosis on the air-conditioner system. This work studies the structural path of the air-conditioner system, in particular the inlet and outlet pipes. Through P-test and P-analysis on the pipes, this work builds up the noise and vibration prognosis procedure and helps on structural design modification for noise and vibration concern.