考量氣體負載下迴轉式壓縮機動態負載分析模型之建立;Modeling of Dynamic Analysis of A Rotary Compressor with Considering Gas-induced Loads

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Title:	考量氣體負載下迴轉式壓縮機動態負載分析模型之建立;Modeling of Dynamic Analysis of A Rotary Compressor with Considering Gas-induced Loads
Authors:	呂明恆;Lu, Ming-Heng
Contributors:	機械工程學系
Keywords:	迴轉式壓縮機;多體動力學;循環氣體負載;動態響應
Date:	2017-08-21
Issue Date:	2017-10-27 16:20:36 (UTC+8)
Publisher:	國立中央大學
Abstract:	迴轉式壓縮機具有構造簡單、成本低的優勢，因此在家用空調中有很大的比例是使用迴轉式壓縮機，為了達到壓縮流體的目的，迴轉式壓縮機無法避免的是不對稱之幾何結構，若沒有偏心轉軸凸輪狀之結構，壓縮機無法壓縮氣體，因此不對稱之幾何結構成為了振動最大的主因，也成為了迴轉式壓縮機最大的缺點。若能建立一模型可以成功預測於氣體負載下迴轉式壓縮機之動態響應，可以輕易改變馬達轉速、氣體造成之負載等工作狀況，預先得知偏心轉軸之位移情形、加速度變化等，可以大幅省去壓縮機改良研發之作業時間。因此，本研究建立一組迴轉式壓縮機之多體動力學分析模型，其中不僅考量冷媒氣體在機構中造成之流體壓力，亦考量了配重塊質量與安裝之相位角對於運轉下之迴轉式壓縮機造成之影響。本文中亦對於實務上常使用之兩種工作狀況下模擬，並對於兩種工作狀況提出改良之建議配置，整理上述情況之軸承負載力、偏心轉軸之位移狀況等，並配合實驗結果作分析討論，提供製造商初步對於振動噪音改善之方針，以利改進其壓縮機之動態特性。;With its simplicity and low cost, rotary compressors are widely adopted in household air conditionings. The geometric structure of the compressor is made asymmetrically to form an eccentric cam in order to conduct the compression process of the refrigerant, which becomes the major cause of its vibration and its biggest drawback. By establishing a numerical model that could predict the dynamic response of the rotary compressor under various working conditions such as different rotation speeds and gas loads, the displacement and the change of acceleration of the shaft can be obtained in advance, which will dramatically reduce the time of development of compressors. Therefore, a multi-body dynamic model was established in this research, which considers the fluid pressure induced by the refrigerant and the mass and phase angle of the counterweight to evaluate their influence on an operating rotary compressor. Optimized conditions were proposed based on the simulations conducted under two practical working conditions. Summarizing the above results including the load of bearings and the displacement of the shaft, the analysis and the experiment result can be provided to the manufacturer in order to improve the dynamic response such as vibration and noise of the compressor.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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