空气能热水器低频噪声分析与控制

针对某型空气能热水器,借鉴汽车NVH特性研究技术,利用试验方法采集样机数据,分析数据中异常噪声频率分布,识别出主要噪声频率。在空气能热水器机箱下部结构有限元与声学有限元以及声—固耦合有限元建模基础上,分别对三者进行模态频率计算,通过对比分析三者的模态频率,确定空气能热水器低频噪声产生的主要原因。根据分析结果对机箱结构优化和改进,并对整改机型进行试验测试。结果表明,与样机相比整改机型的低频噪声得到很好地控制,为空气能热水器低频噪声的分析与控制提供一种有效的方法。

Analysis and Control of Low Frequency Noise of Air Source Water Heaters

For a certain type of air source water heaters, referring to the research technology of automobile NVH characteristics，this paper analyzed the frequency distribution of abnormal noise in the data by using testing method to identify the main noise frequency. The substructure finite element model, acoustic finite element model and acoustic-structure coupling finite element model for an air source water heater were built to compute modal frequencies. Through the comparative analysis of the three kinds of modal frequency, the mainly cause of low frequency noise is determined. According to the results of analysis, the structure of air source water heater is optimized, and the optimized product was tested. The results show that, compared with the prototype, low frequency noise of the optimized product is under good control. This paper provides an effective method for the analysis and control of low frequency noise of air source water heater.