本文選題：活塞式壓縮機 + 消聲器　； 參考：《合肥工業(yè)大學》2014年碩士論文

【摘要】：壓縮機是冰箱的動力源，同時也是噪聲的主要來源。隨著時代的發(fā)展進步生活質量的提高，人們對家用電器各方面性能的要求也越來越高，不但要求家電節(jié)能高效率，噪音和振動水平也受到很大的重視。因此，提高家用電器的效率、減低其振動和噪聲水平，才能提高市場的占有率。 本文在分析了活塞式壓縮機噪聲發(fā)生機理和傳遞路徑的基礎上，分別研究了壓縮機曲柄滑塊機構擾流噪聲、電磁噪聲、軸承噪聲、進排氣噪聲等，得出了進氣噪聲是壓縮機噪聲的主要來源，并且在630Hz、3150Hz頻段噪聲幅值較大，為壓縮機進一步降噪研究奠定了基礎。 對壓縮機進氣消聲器的聲學性能、流體特性等進行了進一步研究。通過聲學有限元仿真，計算其傳遞損失；然后通過改變結構參數(shù)，如：消聲器擴張室級數(shù)、隔板位置、主氣流通道位置、內插管長度等，尋找最優(yōu)的消聲組合；計算了消聲器的阻力特性，得出了影響壓力損失的主要因素，通過改進有效地提高了消聲器的綜合性能。 以阻抗管測量材料聲阻抗的原理為基礎，搭建了四傳聲器法測量消聲器傳遞損失試驗臺，使用過渡錐形管，解決了消聲器進排氣孔徑與阻抗管管徑不一致的問題，并去除錐形管傳遞損失的影響，得到消聲器自身的傳遞損失曲線。試驗結果與仿真數(shù)據(jù)具有較好的一致性，一方面驗證了仿真分析的可行性，同時說明了改進后消聲器消聲性能的提高。 對壓縮機進行試驗模態(tài)分析，提取了壓縮機殼體前七階模態(tài)參數(shù)。壓縮機模態(tài)頻率主要集中高頻段，其中3000Hz左右模態(tài)集中，確定了壓縮機整體噪音在3150Hz頻段內噪音較大的原因。另外壓縮機振動的薄弱環(huán)節(jié)主要在上下殼體的焊接處，壓縮機內部4000Hz左右的振動也會激勵起壓縮機殼體頂部的振動。試驗結果為壓縮機殼體的優(yōu)化提供了參考。
[Abstract]:Compressor is the power source of refrigerator, but also the main source of noise. With the development of the times and the improvement of the quality of life, the requirements for the performance of all aspects of household appliances are becoming more and more high, not only requires the household appliances to save energy and high efficiency, but also the level of noise and vibration has been attached great importance. Therefore, to improve the efficiency of household appliances, reduce its vibration and noise level, can increase the market share. Based on the analysis of the noise generation mechanism and transfer path of piston compressor, the scrambling noise, electromagnetic noise, bearing noise, intake and exhaust noise of crank slider mechanism of compressor are studied respectively in this paper. It is concluded that the intake noise is the main source of compressor noise, and the noise amplitude is large in the frequency range of 630 Hz ~ 3150 Hz, which lays a foundation for further research on the compressor noise reduction. The acoustic performance and fluid characteristics of compressor intake muffler are further studied. The transmission loss is calculated by acoustic finite element simulation, and the optimal combination is found by changing the structural parameters, such as the expansion chamber series of the muffler, the location of the separator, the position of the main airflow passage, the length of the intubation, etc. The resistance characteristics of the muffler are calculated and the main factors affecting the pressure loss are obtained. The comprehensive performance of the muffler is improved effectively through improvement. Based on the principle of measuring material acoustic impedance by impedance tube, a four-microphone test rig was built to measure the transmission loss of muffler. The problem of the inconsistency between the inlet and exhaust aperture of muffler and the diameter of impedance tube was solved by using the transition cone tube. The transmission loss curve of the muffler is obtained by removing the influence of the transmission loss of the cone tube. The experimental results are in good agreement with the simulation data. On the one hand, the feasibility of simulation analysis is verified, and the improved muffler noise performance is improved. The first seven order modal parameters of compressor shell were extracted by modal analysis of compressor. The compressor modal frequency is mainly concentrated in the high frequency range, in which 3000Hz mode concentration, determine the compressor overall noise in the 3150Hz frequency band noise larger reasons. In addition, the weak link of compressor vibration is mainly in the welding place of upper and lower shell, and the vibration of 4000Hz inside the compressor will also stimulate the vibration of the top of the compressor shell. The test results provide a reference for the optimization of compressor shell.
【學位授予單位】：合肥工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TB657.4;TB535

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