【作者】 付常佳；

【导师】 陈长征；

【作者基本信息】 沈阳工业大学 ， 机械电子工程， 2009， 硕士

【摘要】 随着现代设计技术水平的不断提高,压缩机的性能指标不断得到强化,研究如何降低压缩机的噪声和减少振动成为了重要的课题。本文对离心压缩机振动噪声产生机理进行了详尽的分析,并且系统地研究了振动噪声控制技术,提出减振降噪方案。为离心压缩机车间减振降噪项目提供了理论基础。首先确定了离心压缩机车间的振动源,采用振动频谱分析仪在各测点进行测量,通过分析离心压缩机的振动频谱以及振动过程,得出了振动原因。再根据离心压缩机的振动原因提出相应合理的解决方案,如对管路进行隔振处理消除管路振动,在地面和机组之间加减振垫来减小离心压缩机机组的振动。在离心压缩机组周围设置不同的测点,采集了离心压缩机组的噪声信号,并进行频谱分析。根据噪声频谱来分析噪声源的声学特征。再通过噪声学控制理论和实际噪声控制项目经验确定噪声控制方法。使用隔声罩把离心压缩机组与工作区隔离,进行隔声控制;使用宽频带阻抗复合吸声结构进行吸声控制;使用阻抗复合式消声器进行消声控制。通过一系列的综合治理,消除了车间内混响现象,噪声声压级也得到了很大的降低,项目最终取得了很好的效果。宽频带阻抗复合吸声结构在噪声控制工程中得到很高的实用价值。使用SYSNOISE有限元软件,以隔声罩为研究对象,基于有限元分析方法,建立有限元模型并分析了厚度,阻尼层对隔声罩降噪效果的影响。得出了厚度和阻尼层的变化会对隔声罩降噪效果产生直接影响的结论,为解决实际问题提供了一定的参考依据。更多还原

【Abstract】 With the continuing rise in the level of modern design compressor Performance indicators are continuously strengthened how to reduce compressor noise and vibration has become an important subject.Centrifugal compressor as the main research target , this paper mainly studies vibration and noise sources, transmission mechanism, principles of performances, and soon, in-depth studies vibration and noise control technologies, formulates optimization programs. Providing a theoretical basis for vibration and noise reduction of centrifugal compressor workshop .At first,identified the vibration source of the centrifugal compressor workshop. Summarized the centrifugal compressor generator breakdown diagnosis detailed process. The corresponding and reasonable solution is given for Centrifugal compressors’ vibration issue so as to address the root causes of the vibration unit. According to the reasons for the vibration of centrifugal compressor , propose appropriate and reasonable solution, such as the isolation of the pipeline, and set damping pad between the crew and the ground to reduce the vibration of centrifugal compressor.Set up different measurement points around the centrifugal compressor group. Signal of noise eradiated from refrigerator of Centrifugal compressor had been collected, and transform the signal into spectrum. Analyze the acoustic characteristics of the noise source according to the noise spectrum. And determine the noise control methods through the noise control theory study and practical experience in noise control project. Using acoustic enclosures to control noise between centrifugal compressor unit and work area; Using broadband acoustic impedance structure for sound absorption control; Using impedance compound muffler for noise control. Reverberation had disappeared and sound pressure level had declined in the room after noise reduction. A practicality value can be gotten in noise control project with compounding large channel sound-absorbing structure.In this paper, sound insulation encasing is for the study based on finite element method, using SYSNOISE software, establishing finite element models and analyzing of the influence of noise radiation of the sound insulation encasing with different thickness and damping. Obtained a conclusion of difference in thickness and damping will affect the noise reducing and provide some reference to solve practical problems.更多还原