噪声与振动控制2018，Vol.38Issue(z1)：477-482,6.DOI:10.3969/j.issn.1006-1355.2018.Z1.103
城市轨道交通箱梁中高频振动导纳特性试验研究
Study on Mid-and High-frequency Mobility Characteristics of Urban Rail Transit Box-girders
摘要
Abstract
A hammer excitation test was carried out on a 30m long simply-supported box-girder of an urban rail transit line, and the mid- and high-frequency mobility characteristics were investigated. The results show that the predominant frequencies of top slab and flange slab mobility are both ranged from 80 Hz to 125 Hz with peak value central frequency of 100 Hz; while the predominant frequencies of web slab and bottom slab mobility are both ranged from 63 Hz to 100 Hz with peak value central frequency of 80 Hz. Mid- and high-frequency mobility of each slab decreases gradually with the increasing of the distance between the testing location and the excitation location. The force acting on the box-girder has little effect on the beam segment beyond L/4 (L denotes the box-girder span) from the excitation point. The mid-and high-frequency vibration characteristics of the cross sections of the box-girder are almost the same due to their similar shape and size. The coincidence of the peak frequencies of the slab mobility may cause the resonance and amplify the vibration and noise radiation. Increasing the thickness of each slab can restrain the mid-and high-frequency vibration and is beneficial to the vibration and noise reduction.关键词
振动与波/箱梁/锤击试验/中高频振动/导纳/噪声Key words
vibration and wave/box-girder/hammer excitation test/mid-and high-frequency vibration/mobility分类
交通工程引用本文复制引用
宋立忠,李小珍,高慰,张迅..城市轨道交通箱梁中高频振动导纳特性试验研究[J].噪声与振动控制,2018,38(z1):477-482,6.基金项目
国家自然科学基金资助项目(51378429、51778534) （51378429、51778534）
