應用多體動力學於具循環氣體負載之迴轉式壓縮機振動預測模型建立;Modeling of Vibration Prediction of a Rotary Compressor with Cyclic Gas-induced Loads Based on Multi-body Dynamics

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Title:	應用多體動力學於具循環氣體負載之迴轉式壓縮機振動預測模型建立;Modeling of Vibration Prediction of a Rotary Compressor with Cyclic Gas-induced Loads Based on Multi-body Dynamics
Authors:	李泱叡;Lee, Yang-Ruei
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;振動預測;動態響應;rotary compressor;multi-body dynamics;cyclic gas-induced loads;vibration prediction;dynamic response
Date:	2018-08-08
Issue Date:	2018-08-31 15:04:18 (UTC+8)
Publisher:	國立中央大學
Abstract:	迴轉式壓縮機因構造簡單、製造成本較低等優勢被廣泛應用於家用空調系統中。壓縮機核心壓縮件透過相互配合之偏心迴轉運動達到壓縮工作流體之功效，然而偏心機構件在高速迴轉時因慣性離心力而產生動不平衡問題，此為迴轉式壓縮機主要振動源之一，另外，壓縮腔室之週期性氣體負載變化、馬達扭矩輸出不穩定等亦為壓縮機主要振動源。本研究建立一套方法能分析預測迴轉式壓縮機之振動響應，不僅考量核心轉子系統動平衡、壓縮腔室氣體負載、馬達轉速變化，壓縮機連接機架之腳墊、吸入口與吐出口連接之銅管等邊界條件亦為本方法考量因素。透過實驗方式驗證多體動力學模型具足夠可靠度，能反應真實壓縮機之振動表現，並利用此模型作為研究平台，進行配重塊對壓縮機之振動響應分析，於配重塊設計方面得兩結論：主配重塊和頂配重塊之質量配合相較個別質量偏差，對於減振功效更具影響力，質量偏差同為0.5 g但組合不同，機殼振動量可高達4倍差異；配重塊設計應考量氣體負載，有無考量氣體負載於質量設計具28.76%機殼振動量差異，於安裝相位角設計具6.25%差異。;With its simplicity and low cost, rotary compressors are widely adopted in household air conditionings. The geometric structure of the compressor is asymmetrical to form an eccentric cam in order to conduct the compression process of the refrigerant. However, eccentric rotation cause huge dynamic unbalance, which is one of the major vibration sources of rotary compressors. Additionally, cyclic gas-induced loads in compression chamber and unstable motor torque input also are vibration sources of rotary compressors. By establishing a multi-body dynamic model considering dynamic balance of rotor system, cyclic gas-induced loads, variation of motor speed, characteristics of rubber grommet, suction tube and discharge tube to predict the vibration response of rotary compressor. Doing experiments to verify multi-body dynamic model, which is reliable then doing a series of simulations and analysis about effects of balancers on vibration reducing. There are two conclusions, the matches of main balancers and top balancers are more effective on vibration reducing than the tolerances of balancer weights. Gas-induced loads also affect the effects of balancers, therefore it is better to consider gas-induced loads when design balancers.
Appears in Collections:	[Graduate Institute of Mechanical Engineering] Electronic Thesis & Dissertation

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