摘要
为了获得拱坝动力模型试验所用石膏的动弹性模量,首先通过数值方法(有限单元法)计算得到石膏悬臂梁试件的第一阶固有频率,再通过激光扫描测振仪对试件进行试验模态分析,测得石膏悬臂梁试件的第一阶固有频率.将由数值方法和试验模态分析分别得到的第一阶固有频率,通过反演方法得到石膏在第一阶固有频率下的动弹性模量.试验结果表明:石膏在第一阶固有频率下的动弹性模量与静弹性模量相比,提高了约25.8%.
In order to obtain the dynamic elastic modulus of the plaster used for arch dam dynamication experimentation,the numerical method,FEM,was used to calculate the first-order natural frequency of a plaster cantilever beam.Then,a laser-scanning vibrometer was used for experimental modal analysis of specimens to measure the first-order natural frequency.Through comparison of the results obtained through the numerical method and experimental modal analysis,the dynamic elastic modulus of the plaster at the first-order natural frequency was obtained using the inverse method.The results show that the dynamic elastic modulus of the plaster was about 25.8% higher than the static elastic modulus at the first-order natural frequency.
出处
《河海大学学报（自然科学版）》
CAS
CSCD
北大核心
2012年第2期191-194,共4页
Journal of Hohai University(Natural Sciences)
基金
国家重点基础研究发展计划(973计划)(2007CB714104)
关键词
动弹性模量
悬臂梁
有限元
模态分析
激光扫描测振仪
dynamic elastic modulus
cantilever beam
finite element
modal analysis
laser-scanning vibrometer
