钢弹簧浮置板阻尼比试验研究

Test and Research of Damping Ratio for Steel Spring Floating Slab

阻尼比是评价结构减振效果的重要指标,也是轨道结构动力仿真的关键参数。为了对普通钢弹簧浮置板的阻尼比进行测试分析,对比了落轴和循环加载两种阻尼比测试结果,并探究了不同固有频率计算方法和循环加载次数对系统整体阻尼比的影响。测试结果表明,落轴试验中使用功率谱法或公式法进行结构固有频率计算对最终阻尼比结果影响不大;疲劳试验中经过235万次加载后,钢弹簧浮置板的阻尼比下降15.48%;采用落轴或循环加载测试的各次阻尼比试验结果一致性较好。

Damping ratio is an essential index in structure vibration evaluation as well as one of the key parameters in dynamic simulation. In order to test damping ratio in a typical steel spring floating slab,this paper compared damping ratio results calculated by two kinds of different tests,the wheel-set dropping test and the circle loading test. Effects of various inherent frequency calculating methods and different circle loading times on the whole damping ratio were also analyzed. The results showed that in wheel-set dropping test damping ratios are basically the same when involving various inherent frequencies calculated via either power spectral density or formula; in circle loading test damping ratio declines by 15.48% after 2 million and 350 thousand times of loading. It finds out that the wheel-set dropping test and circle loading test share a good agreement in damping ratio results.