梁振动响应曲线滑动拟合法及在移动荷载识别中的应用

用选定的函数对梁振动响应整段曲线进行似合时,难以精确描述曲线的细部即响应的高频部分和随机部分,分段拟合可以提高拟合的精度.为了保持原响应曲线在分段点处的连续特性,拟合数据向前后延长覆盖分段点,这种拟合方法类似于滑动平均,因此称其为滑动拟合法.通过模型实验验证滑动拟合法识别移动荷载的有效性,并比较多项式和有理分式函数的拟合效果.

Vibration Response Curve Moving Fitting Method and Moving Forces Identification

When the vibration response of the beam is fitted with select function, the detail or high frequencies part of the response can not be fitted precisely. High fitting precision can be obtained by dividing the response into small sections. The continuity of the response at the section nodes can be guaranteed by the fitting data overlapped the section nodes. This method is called moving fitting because it is analogous with moving average method. Model test result shows that the moving fitting method is effective in moving loads identification.