The shock responses of submunition drop on various ground-mediums are modeled and investigated by numerical simulation in this paper. Submunition impacts on concrete surface, gravel ground or sand with various drop ve...The shock responses of submunition drop on various ground-mediums are modeled and investigated by numerical simulation in this paper. Submunition impacts on concrete surface, gravel ground or sand with various drop velocities, different drop angles and attack angles are calculated in a finite element program. The loads and dynamic responses of submunition are analyzed, curves of various drop velocities, drop angles and attack angles related to peak overload are calculated and law of interaction time on different ground mediums is obtained.展开更多
对隧道、桥梁结构和沿线建筑而言,浮置板减振性能优异,但其对轨道板及其上部结构的耗能能力有限。针对此问题,将调谐质量粒子阻尼技术应用于轨道交通振动控制领域,提出一种基于调谐质量粒子阻尼器(Tuned Mass Particle Damper,TMPD)的...对隧道、桥梁结构和沿线建筑而言,浮置板减振性能优异,但其对轨道板及其上部结构的耗能能力有限。针对此问题,将调谐质量粒子阻尼技术应用于轨道交通振动控制领域,提出一种基于调谐质量粒子阻尼器(Tuned Mass Particle Damper,TMPD)的耗能型钢弹簧浮置板结构。基于调谐质量阻尼器(Tuned Mass Damper,TMD)及粒子阻尼理论,利用1:1浮置板轨道进行室内试验,通过落轴试验研究调谐质量粒子阻尼器安装前后钢弹簧浮置板轨道动力学特性。研究结果表明:TMPD能显著降低浮置板轨道在固有频率11.7 Hz附近的振动响应,浮置板加速度分频振级损失最大可达11.9 dB;安装TMPD的耗能型钢弹簧浮置板轨道从钢轨到地面的振动衰减最大可达23.6 dB,表明其具有优异的隔振效果;进行Z振级评价分析可得,耗能型钢弹簧浮置板Z振级约降低5 dB,在保证隔振效率基础上,调谐质量粒子阻尼器可提高浮置板轨道的耗能能力。展开更多
基金Supported by the Project of State Key Laboratory of Science and Technology(ZDKT10-3C&1102)the National Natural Science Foundation of China(11032002)National Basic Research Program of China(2010CB832706)
文摘The shock responses of submunition drop on various ground-mediums are modeled and investigated by numerical simulation in this paper. Submunition impacts on concrete surface, gravel ground or sand with various drop velocities, different drop angles and attack angles are calculated in a finite element program. The loads and dynamic responses of submunition are analyzed, curves of various drop velocities, drop angles and attack angles related to peak overload are calculated and law of interaction time on different ground mediums is obtained.
文摘对隧道、桥梁结构和沿线建筑而言,浮置板减振性能优异,但其对轨道板及其上部结构的耗能能力有限。针对此问题,将调谐质量粒子阻尼技术应用于轨道交通振动控制领域,提出一种基于调谐质量粒子阻尼器(Tuned Mass Particle Damper,TMPD)的耗能型钢弹簧浮置板结构。基于调谐质量阻尼器(Tuned Mass Damper,TMD)及粒子阻尼理论,利用1:1浮置板轨道进行室内试验,通过落轴试验研究调谐质量粒子阻尼器安装前后钢弹簧浮置板轨道动力学特性。研究结果表明:TMPD能显著降低浮置板轨道在固有频率11.7 Hz附近的振动响应,浮置板加速度分频振级损失最大可达11.9 dB;安装TMPD的耗能型钢弹簧浮置板轨道从钢轨到地面的振动衰减最大可达23.6 dB,表明其具有优异的隔振效果;进行Z振级评价分析可得,耗能型钢弹簧浮置板Z振级约降低5 dB,在保证隔振效率基础上,调谐质量粒子阻尼器可提高浮置板轨道的耗能能力。
