This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal...This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal and fixed at both ends.Through our procedure we experimentally find the first 9 Eigen frequencies(21 Hz,60 Hz,116 Hz...)and correlate them using the cantilever theory.展开更多
作为一种新型被动减振技术,颗粒阻尼已被应用于船舶、航空等领域。为进一步研究颗粒阻尼耗能机理,提高其减振性能,基于离散元(Discrete Element Method,DEM)-多体动力学(Multi Body Dynamic,MBD)耦合方法建立弹簧-颗粒阻尼减振系统模型...作为一种新型被动减振技术,颗粒阻尼已被应用于船舶、航空等领域。为进一步研究颗粒阻尼耗能机理,提高其减振性能,基于离散元(Discrete Element Method,DEM)-多体动力学(Multi Body Dynamic,MBD)耦合方法建立弹簧-颗粒阻尼减振系统模型,研究颗粒填充率及颗粒半径对系统减振效果的影响,并分析其耗能特性;通过试验验证DEM-MBD耦合仿真方法的准确性,等效阻尼比仿真值与试验值的平均误差为11.8%。研究结果表明:通过选择合适的填充比,可使弹簧-颗粒阻尼减振系统最大等效阻尼比比无颗粒时提高12.9倍。研究结果可为后续颗粒阻尼减振设计提供一定参考。展开更多
文摘This article presents the optical evaluation of the vibrational behavior of a steel bar,by a non-conventional optoacoustic procedure,the LPD(laser photo deflection)method.On this occasion the bar is located horizontal and fixed at both ends.Through our procedure we experimentally find the first 9 Eigen frequencies(21 Hz,60 Hz,116 Hz...)and correlate them using the cantilever theory.
文摘作为一种新型被动减振技术,颗粒阻尼已被应用于船舶、航空等领域。为进一步研究颗粒阻尼耗能机理,提高其减振性能,基于离散元(Discrete Element Method,DEM)-多体动力学(Multi Body Dynamic,MBD)耦合方法建立弹簧-颗粒阻尼减振系统模型,研究颗粒填充率及颗粒半径对系统减振效果的影响,并分析其耗能特性;通过试验验证DEM-MBD耦合仿真方法的准确性,等效阻尼比仿真值与试验值的平均误差为11.8%。研究结果表明:通过选择合适的填充比,可使弹簧-颗粒阻尼减振系统最大等效阻尼比比无颗粒时提高12.9倍。研究结果可为后续颗粒阻尼减振设计提供一定参考。
