高量级宽带噪声等效加载方法  

Equivalent loading method for high-level noise under broadband condition

作　　者：陶永强 关成启 金亮 邹学锋[2] 潘凯[2] 李明轩 TAO Yongqiang;GUAN Chengqi;JIN Liang;ZOU Xuefeng;PAN Kai;LI Mingxuan(Beijing Aerospace Technology Institute,Beijing 100074,China;Aircraft Strength Research Institute of China,Xi'an 710065,China)

机构地区：[1]北京空天技术研究所,北京100074 [2]中国飞机强度研究所,西安710065

出　　处：《航空学报》2022年第12期46-56,共11页Acta Aeronautica et Astronautica Sinica

基　　金：国家级项目。

摘　　要：以多层复合材料结构为研究对象,按照国军标GJB150.17A—2009规定的噪声载荷谱,完成了总声压级168 dB的宽带噪声随机响应分析,获得了应力较大位置处的频率响应曲线,并根据宽带随机响应分析结果,选取两个不同宽度的窄带频段分别完成了随机响应分析和疲劳寿命分析。结果表明:在声压谱级相同的情况下,宽带加载时结构的主要模态/响应与窄带加载时基本相同,但窄带加载下的结构疲劳寿命长于宽带加载,宽带加载下单位时间内的峰值数大于窄带加载;当窄带加载时的声压谱级提高0.5 dB,计算得到的寿命与宽带加载时基本相同。利用行波管对多层复合材料结构完成了宽带、窄带响应特性试验和疲劳寿命研究,结果表明:根据宽带响应结果选取合适的加载带宽,窄带加载能够代替宽带加载。In light of multi-layer composite materials,random response analysis was achieved with the broadband noise of 168 dB according to GJB150.17 A—2009,and frequency response curves were obtained at the position of maximum stress.Based on the analysis results with the broadband noise,two narrowbands were chosen for random response analyses and fatigue life analyses.Experimental results show that fatigue life under the narrowband loading is longer,number of peaks per unit time under the broadband loading is more.When sound pressure spectrum level under narrowband loading increases 0.5 dB,fatigue life under the narrowband loading and the broadband loading is almost equal.Experiments were completed with broadband and narrowband noises at the assistance of traveling wave tubes.Experimental results show that narrowband loading is equivalent to that of the broadband with the selection of appropriate loading bandwidth according to the broadband response results.

关 键 词：高量级 噪声 等效加载 宽带 窄带 

分 类 号：V216.54[航空宇航科学与技术—航空宇航推进理论与工程]