【作者】 韩睿；

【导师】 舒歌群；

【作者基本信息】 天津大学 ， 动力机械及工程， 2004， 硕士

【摘要】 压缩机是冰箱、空调等家用电器的主要组成设备。随着时代发展和人民生活水平的提高，对冰箱、空调等家用电器的噪声要求越来越高。压缩机是冰箱、空调等家用电器的主要噪声源，低噪声、高效率压缩机在市场上必然会对用户产生更大的吸引力。本文首先对压缩机进行了噪声振动测试，分别对压缩机三种工况下进行声功率、声压级和壳体振动测试，获得噪声和振动频谱。通过理论计算和分析确定了噪声频谱图中各噪声峰值对应的噪声源及其传递路径，指明了压缩机降噪的主要目标。其次，对压缩机机体外壳做模态实验分析，获得了1500HZ-5000HZ之间的13阶模态，并利用有限元软件MSC/NASTRAN计算了压缩机机体模态。确定噪声测试结果中的2500HZ和3150HZ处噪声是机体外壳的辐射噪声。而后，对壳体结构做优化设计，提出两种改进方案并用MSC/NASTRAN对两种方案进行模态计算，确定了较好的方案。在噪声频谱中的800HZ处噪声推测是压缩机的进气噪声，为此对进气消声器结构进行优化设计，确定了在消声器中增加一个腔的方案。用四端网络法对消声器做消声量计算，并使用LabView软件编写了计算界面。对压缩机排气细管做激励噪声测试，获得三个方向的激励噪声，确定600HZ附近噪声是排气细管的气流脉动激励噪声。针对2500HZ和3150HZ处噪声，改进排气消声器，进而提出三个方案，经分别计算插入损失，比较确定了最佳方案。利用MSC/NASTRAN对压缩机进气阀片进行模态计算，获得12阶模态频率和振型，分析确定800HZ附近噪声是进气阀片的振动噪声。 对改进后的压缩机进行声功率测试，经比较整机噪声降低1.09dB。更多还原

【Abstract】 Compressor is the main equipment of refrigerator and air-condition. With the development of ages and improvement of people living level, the requirement of the refrigerator and air-condition noise is higher. Compressor is the main source of refrigerator and air-condition noise, compressor with lower noise and higher efficiency will be of more attraction to people.Firstly, this paper make noise and vibration experiment, carry out the sound power, sound pressure level(A) and vibration of shell in three work conditions, obtain the noise and vibration spectrum. Through theory computation and analysis, the source of noise and transfer paths corresponding to every noise peak value are confirmed, the main aim to decreasing noise is pointed out.Secondly, model analysis is made on compressor shell, 13 models between 1500Hz and 5000Hz are abstained and compressor shell model is computed using a set of FEM software –MSC/NASTRAN. Make certain that noise at 2500HZ and 3150HZ are radiate noise of shell. Make optimize design on shell structure, present two ameliorate project and carry out model computation on the two project using MSC/NASTRAN to ascertain better project.It is presumed that noise at 800HZ in spectrum is inspirational noise. Thus the inspirational noise-reducer is optimized, and chooses the project of inserting one cavity. The inserting loss is computed using four-ferminal networks. The interface of computation is wrote using LabView.The inspiring sound of compressor exhaust pipe-line is tested and sound of three directions is obtained. It is ascertained that noise at 600HZ is gas pulsation noise. Exhausted reducer is modified for the noise at 2500HZ and 3150HZ. Two measures is put forward and the best measure is ascertained through computing inserting loss.The model of inspirational leaf spring valve is calculated using MSC/NASTRAN, 12 models and mode of vibration are obtained. It is ascertained that noise at 800HZ is inspirational leaf spring valve noise and sticking damping reduces noise and vibration.Sound power is measured on ameliorated compressor, the whole compressor noise reduces 1.09dB.更多还原