摘要
在理论推导梁轴向振动微分方程基础上,提出一种以轴向振动低阶模态振型二阶导数为损伤指标的结构损伤识别方法。在方钢管构件上布置加速度传感器进行轴向振动模态试验,测试时由信号发生器发出正弦波信号,经功率放大器放大后通过电磁激振器对结构进行激励,同时采集各测点的加速度反应信号。在确定结构共振点后,根据共振点处加速度值,编制轴向振动损伤指标的计算程序,分析结果表明该指标对结构损伤的位置和程度均很敏感,既能精确定位损伤,又能标定损伤程度,即在损伤位置将发生相反方向的突变,且突变幅度随损伤程度增大而增大。
A damage diagnosis method based on axial vibration was presented in the light of theoretically derived axial vibration differential equation.The method takes the second derivative of low-level axial vibration modal shape as damage index.Modal experiment of axial vibration was performed on steel components with sine wave excitation and acceleration response collection.The resonance point was determined,and the axial vibration damage index was calculated based on the acceleration value at the resonance point.The test and calculation results show the damage index is very sensitive to both the location and degree of structural damage and is helpful to plan the calibration.The index will change to the opposite direction suddenly at the damage position and the magnitude of sudden change may indicate the degree of damage.
出处
《振动与冲击》
EI
CSCD
北大核心
2010年第12期122-125,共4页
Journal of Vibration and Shock
基金
国家自然科学基金(50808005)
北京市自然科学基金重大项目(8100001)
关键词
轴向振动
损伤诊断
模态试验
加速度信号
axial vibration
damage diagnosis
modal test
acceleration signal
