摘要
为了得到安装在不同扣件系统下钢轨的振动特性,室内以WJ-7型扣件为样品,采用力锤激振法对其进行动力测试。基于MATLAB软件信号分析处理平台,利用线性短时傅里叶变换,非线性Page变换和Zhao-AtlasMarks变换对振动信号的时频特性进行对比分析。研究结果表明:钢轨轨脚振动主要集中在中高频,其中在2 250Hz振动能量最大,且持续时间最长;短时傅里叶变换(Short-time Fourier transform,简称STFT)具有较高的时间和频率分辨率,可以将轨脚的时域、频域和时频域的固有属性一一对应起来;非线性Page时频分析在能量较高的高频段具有较好的分辨率,而在低频段显得无能为力;非线性Zhao-Atlas-Marks分布时频分析在低频段效果较好,在高频段不是很理想。该分析结果可为轨道结构的振动噪声控制提供依据。
In order to get the vibration characteristics of rail installed on different fastening system,the dynamic test has been made on the rail using WJ-7type fastener as sample indoor with the hammer excitation method.Based on the signal analysis and processing platform of MATLAB software,the time-frequency characteristics of vibration signals are analyzed using the linear short-time Fourier transform and nonlinear Page transformation,Zhao-Atlas-Marks transform.The results show that the vibration of rail foot is mainly concentrated in the high-frequency and wherein the 2,250Hz vibration energy is the largest with the longest duration.The STFT has higher time and frequency resolution,and the inherent property of rail foot could correspond to each other in time domain,frequency domain and time-frequency domain.The nonlinear Page time frequency has a better resolution in the high frequency band with high energy,but powerless in the low-frequency band.Nonlinear Zhao-Atlas-Marks time-frequency analysis has a better effect in the low frequency band,while it is not very satisfactory in the high-frequency band.The results could provide the basis for the control of the vibration and noise of the track structure.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第1期33-38,187,共6页
Journal of Vibration,Measurement & Diagnosis
基金
铁道部重点资助项目(2012G008-D)
铁道部重大科研资助项目(2011G009)
国家自然科学基金资助项目(51008256)
关键词
扣件系统
时频分析
振动特性
动力测试
rail fastening system
time frequency transform
vibration characteristics
dynamic test
