| 梯形轨道系统动力特性及减振效果试验研究 |
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| 引用本文： | 王文斌,刘维宁,马蒙,孙晓静,李克飞.梯形轨道系统动力特性及减振效果试验研究[J].中国铁道科学,2010,31(2). |
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| 作者姓名： | 王文斌 刘维宁 马蒙 孙晓静 李克飞 |
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| 作者单位： | 北京交通大学隧道与岩土工程研究所,北京,100044 |
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| 基金项目： | 国家自然科学基金资助项目 |
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| 摘 要： | 采用锤击法,对梯形轨道系统(简称梯轨)进行动力特性试验。利用变时基传递函数细化分析方法,解决力信号时域波形精度与加速度信号频率分辨率之间的矛盾,提高低频脉冲频响分析精度。根据锤头材料的锤击特性和试验研究的频率范围,分别选择尼龙和钢制锤头进行梯轨模态和减振特性试验研究。结果表明:梯轨的低阶模态分布比较密集,基频为48.6Hz,前3阶模态的阻尼比较高,1阶阻尼比最大,达到6.64%;梯轨的工作频率约为50Hz,在梯轨工作频率之上1/3倍频程中心频率处,传递损失不随锤击力的大小而变化,梯轨的振动衰减系数为常数;梯轨具有较高的减振作用,在0～1000Hz频段传递损失在45dB左右。
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| 关 键 词： | 城市轨道交通 梯形轨道 动力特性 锤击法 变时基 传递损失 试验研究 |
Experimental Study on the Dynamic Characteristics and the Vibration Mitigation Effect of Ladder Track System |
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| WANG Wenbin,LIU Weining,MA Meng,SUN Xiaojing,LI Kefei.Experimental Study on the Dynamic Characteristics and the Vibration Mitigation Effect of Ladder Track System[J].China Railway Science,2010,31(2). |
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| Authors: | WANG Wenbin LIU Weining MA Meng SUN Xiaojing LI Kefei |
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| Affiliation: | WANG Wenbin,LIU Weining,MA Meng,SUN Xiaojing,LI Kefei (Institute of Tunnel & Geotechnical Engineering,Beijing Jiaotong University,Beijing 100044,China) |
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| Abstract: | By means of hammering method, tests were carried out on the dynamic characteristics of the ladder track system. By making use of the varied-time-base transfer function detailed analysis method, the conflict between the accuracy of the time-domain waveform and the frequency resolution of the acceleration signal of the ladder track system was solved, which improved the analysis precision of the low frequency response. By analyzing the hammering characteristics of different hammerheads and the sample frequency... |
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| Keywords: | Urban mass transit Ladder track Dynamic characteristics Hammering method Varied-time-base Transfer loss Experimental study |
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