壓縮機於空調機邊界之模擬與振動特性探討

空調機中，迴轉式壓縮機連接到管路並安裝在三個橡膠墊上，壓縮機的邊界效應包括橡膠墊和管路。本文旨在建立壓縮機有限元素模型的模擬技術和實驗驗證，包括橡膠腳墊和管路邊界。壓縮機有限元素模型以8個節點立體元素構建，均需適當設定所有零件的幾何和材料參數，以及零件之間接觸介面的接觸類型和剛度值。首先，針對自由邊界的壓縮機分別進行理論模態分析（TMA）和實驗模態分析（EMA），由模型驗證程序中，以實驗所得的模態參數為基準，可校正所設定的模擬參數，以驗證壓縮機有限元素模型能等效於實際結構。其次，以撓性矩陣方法模擬腳墊邊界，對具有腳墊邊界的壓縮機進行TMA和EMA，以實驗取得的模態參數為基準，校正腳墊之勁度矩陣，以吻合實際壓縮機結構特性。最後，含腳墊邊界的壓縮機模型帶入已驗證的管路模型，也進行TMA和EMA以獲得結構振動模態。結果顯示，空調機邊界下的壓縮機模型含腳墊及管路邊界之模擬分析，可以合理地預測壓縮機結構的剛體模態和撓性體模態，並與實驗所得到的振動模態相對應。本文介紹了壓縮機的建模技術從自由邊界、腳墊邊界、到含腳墊和管路實際邊界，以及對應的實驗驗證，也建立了經校正和驗證的空調機邊界壓縮機模型，可供未來的其他應用分析。

關鍵字

迴轉式壓縮機；空調機；邊界之模擬；振動模態

並列摘要

In air conditioner, the rotary compressor are connected to pipe lines and rested on three rubber pads. The boundary effects of compressor include the rubber pads and pipe lines. This work aims to establish the simulation techniques and experimental verification of finite element (FE) model of the compressor with both the pad boundary and pipeline boundary. The compressor FE model containing all components' geometry and material properties are built by 8 node brick elements. Those interfaces between components are specified with proper connection parameters for contact types and stiffness values. The compressor in free boundary condition is first considered to perform theoretical modal analysis (TMA) and experimental modal analysis (EMA), respectively. Through model verification procedure base on the experimental modal data, we can validate compressor FE model to calibrate the specified simulation parameters and get the equivalent numerical model. Next, the compressor in rubber pad boundary is considered. The pad boundary is simulated by joint stiffness matrix method. By performing TMA and EMA on the compressor with pads, we can obtain the calibrated joint flexibility matrix for pad boundary. Finally, the compressor rested on pads and connection to pipe lines that are verified in advance is also performed TMA and EMA, respectively, to obtain structural vibration modes. Results show the compressor FE model in air conditioner boundaries, i.e. pads and pipelines, can reasonably predict the rigid body modes and flexible body modes of the compressor that are comparable with the experimentally extracted modes. This work demonstrates the modeling techniques of the compressor from free boundary, pad boundary to practical boundaries with pads and pipelines as well as the experimental verification. The calibrated and validated compressor FE model in air conditioner boundaries are well established and can be useful for future applications.

並列關鍵字

rotary compressor ； air conditioner ； boundary simulation ； vibration modes

國際替代計量

壓縮機於空調機邊界之模擬與振動特性探討

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