典型无序结构芯体夹层梁的振动特性试验分析  

Experimental analysis on vibration characteristics of sandwich beams with typical disordered porous metal cores

作　　者：黄磊[1,2] 岳晨冲 李斌潮 张志家 张钱城 金峰[1] HUANG Lei;YUE Chenchong;LI Binchao;ZHANG Zhijia;ZHANG Qiancheng;JIN Feng(State Key Laboratory for Mechanical Structure Strength and Vibration,Xi'an Jiaotong University,710049 Xi'an,China;State Key Laboratory of Science and Technology on Liquid Rocket Engine,Xi'an Aerospace Propulsion Institute,710100 Xi'an,China)

机构地区：[1]西安西安交通大学机械结构强度与振动国家重点实验室,西安710049 [2]西安航天动力研究所液体火箭发动机技术国防科技重点实验室,西安710100

出　　处：《应用力学学报》2022年第2期262-267,共6页Chinese Journal of Applied Mechanics

基　　金：装发部预先研究资助项目(No.41410040202);机械结构强度与振动国家重点试验室开放课题(No.SV2019-KF-28);基础加强计划技术领域基金资助项目(No.2019-JCJQ-JJ-480);陕西省创新人才推进计划-青年科技新星资助项目(No.2020KJXX-020)。

摘　　要：通过悬臂梁模态试验研究了典型无序芯体(纤维毡、闭孔泡沫铝以及开孔泡沫铝)夹层结构的振动特性,并与夹层结构所对应等质量钢板进行振动特性对比分析。研究结果表明:无序芯体夹层结构相较于对应等质量钢板均有着更高的前三阶固有频率和阻尼比;等质量钢梁任一横截面上各点具有相同振动特性,而夹层结构任一横截面上各点振动特性受芯体结构影响较大。The vibration characteristics of sandwich structures with typical disordered porous cores(i.e.,fiber felt,closed-cell aluminum foam,and open-cell aluminum foam)were analyzed through laboratory modal tests of sandwich cantilevers with fixed end boundary conditions applied at a free end.It was found that compared with the corresponding steel plates of the same mass,the sandwich beams with disordered porous metal cores have higher natural frequencies and damping ratios at the first three modes.Any cross section of the steel beam has the same vibration characteristics on its all points,but all points of vibration characteristics of sandwich beams at any cross section depend on the common influence of relative density and peak strength.

关 键 词：无序芯体 夹层结构 模态分析 固有频率 

分 类 号：TB33[一般工业技术—材料科学与工程]