螺旋桨噪声中轴频的闭环检测方法  

Closed-loop detection method of shaft frequency of propeller noise

作　　者：罗昕炜[1] 方世良[1] 

机构地区：[1]东南大学水声信号处理教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2013年第6期1168-1173,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家重大基础研究发展计划(973计划)资助项目(6131222);"十二五"国防预先研究资助项目(40102010030101);国家自然科学基金资助项目(11104029;11104141);中央高校基本科研业务费专项资金资助项目(3204003301)

摘　　要：基于多元复合假设检验模型,将谐波信号的闭环检测和估计算法应用于DEMON线谱的提取,提出了一种基于联合检测与估计的DEMON算法(JDEMON).该算法设计了DEMON线谱检测和轴频估计之间的耦合机制,利用了DEMON线谱的谐波特性,构建了轴频的检测统计量.在JDEMON处理过程中,首先给出一个假设的轴频先验分布,然后基于谱分析进行线谱检测和轴频估计,最后利用估计器的输出结果对先验的轴频分布信息迭代修正,重复进行线谱检测和轴频估计,形成闭环检测,从而提高了线谱检测和轴频估计性能.仿真数据和实测螺旋桨噪声数据的分析表明,与传统的DEMON处理方法相比,该方法提高了对螺旋桨噪声的轴频估计精度和线谱检测概率.A detection of envelope modulation on noise （DEMON）method based on the joint detec-tion and estimation （JDEMON）is proposed by applying closed-loop detection and estimation algo-rithm of harmonic signals to the DEMON line spectrum extraction according to the model of multiple composite hypothesis testing.In the proposed method,the coupling mechanism between the detec-tion and estimation of the DEMON line spectrum is designed and the test statistic of the shaft fre-quency of propeller is built by using the harmonic characteristics of the DEMON line spectrum.In the process of JDEMON,the prior distribution of the propeller speed is first supposed,and then the spectrum analysis is used to detect the line spectrum and estimate the shaft frequency.Finally,based on the estimated output of the prior distribution information of the shaft frequency through the itera-tive correction,the closed-loop detection is formed by the repeat detection of the line spectrum and the estimation of the shaft frequency.The simulated data and the measured propeller noise data anal-ysis show that the proposed method can improve the estimation accuracy of the shaft frequency and the detection probability of line spectrum compared with the traditional DEMON method.

关 键 词：DEMON 谐波 线谱检测 闭环检测 

分 类 号：TN911.7[电子电信—通信与信息系统]