摘要
为了从源头抑制轨道交通产生的振动噪声,采用力锤激励法实测了扣件-钢轨耦联系统的加速度阻抗,从加速度阻抗曲线上得到了钢轨的振动模态及相应固有频率处的加速度阻抗幅值,通过不平顺波长与激振频率关系推出了不同行车速度下最不利不平顺波长。对钢轨进行了频率响应分析、脉冲响应分析和脉冲响应函数的时频分析,分离出了钢轨振动优势频率,其值与从加速度阻抗曲线识别得到的结果一致,同时还得到了优势频率的振动持续时间。试验说明,优势频率是钢轨振动与辐射噪声的主要频率,只要能控制优势频率的振动,就可以抑制钢轨的全频域振动与噪声。
In order to reduce the noise and vibration generated by rail traffic from the source,the vibration modes of the rail and the corresponding intrinsic acceleration frequency impedance amplitudes are identified from the acceleration impedance curve,by using the hammer excitation method to measure the acceleration impedance of the rail-fastener coupled system.Based on this,the most adverse irregularity wavelengths under different driving speeds are introduced by the relationship between the wavelength and excitation frequency of the irregularity.In addition,the analyses for rail frequency response,impulse response,and time-frequency of the impulse response function are done on the rail,and the dominating vibration frequencies and their vibration durations are then obtained.The dominating vibration frequencies are consistent with the results obtained from the acceleration impedance curve,and are exactly where the rail vibration and noise frequency radiation are primarily found.Thus,if the main vibration frequencies are brought under control,the full range of rail vibration and noise can be inhibited.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2014年第4期680-685,778,共6页
Journal of Vibration,Measurement & Diagnosis
基金
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
锤击法
扣件-钢轨耦联系统
加速度阻抗
时频分析
hammering method
rail-fastener coupled system
acceleration impedance
time-frequency analysis
