基于工况传递路径分析(OTPA)方法的热泵热水器室外机振动噪声分析

Vibration and Noise Analysis of the Outdoor Units ofHeat Pump Water Heaters Based on OTPA Technique

由于具有较高的热效率及良好的经济性、安全性,热泵热水器在日常家居生活中的使用变得越来越普遍。同时热泵热水器室外机工作时产生的噪声与人们追求更高生活水准的矛盾也变得日益突出。工况传递路径分析可在机器正常运行工况下,对噪声源及主要传递路径进行识别分析并确定其对目标点噪声的贡献量,因而可被用于为室外机振动噪声控制提供依据。通过工况传递路径分析确定某型号热泵热水器室外机主要振动噪声源及其传递路径,并通过贡献矢量图分析在振动分量较大频率处对总贡献影响较大的路径,同时结合该路径实测信号判断影响路径振动贡献的主要原因。结果表明,压缩机振动噪声对热泵热水器外机噪声的贡献量最大。

Heat pump water heater is becoming more and more common in daily household life because of its high thermal efficiency,good economy and safety.At the same time,the contradiction between the noise generated by the heat pump water heater and people’s pursuit of higher living standards has become increasingly prominent.Operational transmission path analysis can identify and analyze the noise source and main transmission path to determine their contribution to the noise at the target point under normal operating condition of the machine,so it can be used to provide a basis for noise and vibration control of outdoor units.In this paper,the main vibration and noise sources and their transmission paths of the outdoor unit of a heat pump water heater was determined by analyzing the noise and vibration transmission path at the normal working condition.A contribution vector diagram analysis is presented to determine the major transmission paths of the main frequency components with large amplitudes.At the same time,the main factors affecting the noise and vibration transmission were determined by using the measured signals.The results show that the compressor vibration noise has the largest contribution to the noise of the outdoor unit of the heat pump water heater.