不同橡膠腳墊對壓縮機於空調機邊界下之振動特性探討

迴轉式壓縮機安置於空調系統的方式，係將壓縮機放置在三個橡膠腳墊上方，並聯接管路系統。本文主要是針對不同橡膠腳墊對壓縮機於空調機邊界下的振動特性影響進行探討。首先，對腳墊邊界下的壓縮機進行實驗模態分析，可獲得不同橡膠腳墊邊界下的壓縮機振動模態。同時，建構了不同腳墊邊界的勁度矩陣模擬方式之壓縮機有限元素模型，透過模型驗證程序，可獲得及校正等效於實際結構腳墊邊界之勁度矩陣。另外，為探討不同腳墊對壓縮機在空調機系統邊界下的振動特性影響，本文也建立壓縮機在不同腳墊邊界及相同管路之系統模型，以模擬壓縮機在實際空調機之邊界狀態，並進行理論模態分析，以瞭解不同的橡膠腳墊對整體壓縮機振動模態特性的影響。結果顯示，壓縮機振動模態包括兩種類型：一種是低頻率的剛體模態，另一種是較高頻率的彈性體模態。不同橡膠腳墊之剛性差異對低頻的剛體振動模態之自然頻率有顯著的影響，而對高頻的彈性體振動模態則影響甚微。本文建立了實驗與分析流程完成橡膠腳墊的模擬與校正，也完成壓縮機在整體空調系統上的腳墊與管路邊界的分析模型，可以有效模擬壓縮機結構振動模態特性，未來可應用到響應預測與設計變更的相關議題。

關鍵字

橡膠腳墊；實驗模態分析；理論模態分析；振動模態

並列摘要

The rotary compressor is rested on the rubber pads and connected to pipe lines in the air conditioner. This work aims to investigate the effect of different types of rubber pads on vibration characteristics of compressor that is connected to the same pipe lines. First, the compressor with the rubber pad boundary only is considered to perform experimental modal analysis (EMA) to obtain structural modal parameters. The finite element (FE) model of compressor has been verified in free boundary in advance, and the pad boundary simulation by joint stiffness matrix method is also constructed to obtain the theoretical modal parameters. Through model verification procedure, the pad effect for the stiffness matrix can be determined such that the FE model of compressor in pad boundary is equivalent to the real structure. For practical application, we need to know the vibration modes of compressor with the pad and pipe lines connections for realizing the overall vibration response of the compressor. With the knowledge of pad boundary simulation for two different rubber pads, this work performs theoretical modal analysis (TMA) on the compressor FE models, considering two types of rubber pads and the same pipe lines. Results show there are basically two types of vibration modes, i.e. the rigid modes of compressor in low frequencies and the flexible body modes in high frequencies. The pad stiffness significantly affects the lower frequency modes, while the higher frequency flexible body modes of compressor are not much different in term of natural frequencies and mode shapes. This work calibrates the simulation techniques of rubber pads in conjunction with the compressor. The system model of compressor rested on the rubber pads and connection to pipe lines can then be reasonably constructed to predict the system response. The modeling and analysis of compressor in air conditioner system are established and useful for future applications, such as response prediction and design modification.

並列關鍵字

rubber pad ； experimental modal analysis (EMA) ； theoretical modal analysis (TMA) ； vibration modes

國際替代計量

不同橡膠腳墊對壓縮機於空調機邊界下之振動特性探討

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