摘要
采用边界元传递矩阵法,研究了层状土体中埋置波阻板(WIB)对条形简谐荷载振动的减振效果.土体为层状弹性半无限空间,波阻板埋置在层状土体中,通过计算层状土体中不同观察点的插入耗损,分析波阻板的减振效果.数值结果表明:波阻板对低频有较好的减振效果,但当振动波长相对于波阻板的埋深、宽度较小时,对于某些频率的振动,较远处的观察点有频率放大现象.
A numerical model which investigates the transmission of vibrations and its reduction in the far-field of the surface of the ground is presented.The vibration attenuation device is the wave impedance block（WIB）.It is based on an integral equation and transfer matrix formulation of the problem which is solved by using a boundary element approach.The ground is modeled as an elastic layered half-space and the inclusion is under the load within the layered half-space.The performance of WIB in impeding wave transmissions at a number of receiver positions is studied and measured in terms of insertion loss.It is shown that an inclusion has a beneficial effect at low frequencies.However,when the wave-length becomes short compared with the depth and width of the inclusion,adverse effects occur at some frequencies which are still observed in the far field.
出处
《南昌工程学院学报》
CAS
2011年第3期21-26,共6页
Journal of Nanchang Institute of Technology
基金
国家自然科学基金资助项目(50578071)
江西省教育厅青年科学基金项目(GJJ09367)
南昌工程学院首批大学生科研训练计划项目
关键词
波阻板(WIB)
层状弹性土
边界元传递矩阵法
减振
wave impedance block（WIB）
layered elastic half-space
BEM method
vibration attenuation
