洗碗机SEA噪声预测模型的探讨  

Research on dishwasher SEA noise prediction model

作　　者：刘海生[1] 李文婷[1] 李佳菊[1] 田碧玉[1] 王吉荣[1] 

机构地区：[1]同济大学声学研究所,上海200092

出　　处：《声学技术》2011年第6期505-512,共8页Technical Acoustics

基　　金：国家自然科学基金项目(10774114)

摘　　要：洗碗机基本属于线性、保守和弱耦合的双壳型声振耦合系统。水流激励是使其产生噪声的主要激励源,具有宽频不相干的特点。根据统计能量分析理论建立的洗碗机250 Hz和500 Hz倍频带声功率级(Lwf)统计能量分析(Statistical Energy Analysis,SEA)噪声预测模型的精度分别为4 dB和2 dB。根据该模型制定的洗碗机降噪措施取得明显成效:250Hz和500Hz倍频带声功率级分别降低12 dB和13dB,总声功率级降低了7dB。The dishwasher could be viewed as a linear,conservative and weak-coupled vibroacoustic system with dou-ble-shell.Water current impact is the main excitation with broadband and non-correlative feature to make noise of the dishwasher.The SEA noise band sound power level（Lwf） prediction model based on Statistical Energy Analysis method has high precision： the deviation of 250 Hz and 500 Hz octave is less than 4 dB and 2 dB respectively.The measure which has been put forward by the SEA model yields good result on dishwasher noise control： the Lwf of 250 Hz and 500 Hz octave could be reduced by 12 dB and 13 dB respectively,the total Lwf could be reduced by 7 dB.

关 键 词：洗碗机 统计能量分析 水流冲击 声振耦合 噪声预测模型 

分 类 号：TB53[理学—物理]