摘要
为解决在随机振动离散分析中遇到的由有色噪声荷载的大范围空间相关性引起的实际计算困难,本文在讨论随机荷载的时间相关性和空间相关性的基础上,避开用白噪声滤波产生具有空间相关性的有色噪声荷载的方法,而把它直接当作既具有空间相关性又具有时间相关性的荷载处理,在不改变已有的随机振动离散分析的基本递推公式的前提下,使随机荷载的空间和时间相关性得到统一处理、最后给出了算例和计算结果.
In order to overcome the difficulties occurred in simulating the filtered whitenoise excitations with correlation over a large spatial area in Discrete Analysis Meth-od for random vibration of structures,this paper avoids the traditional way to gener-ate the filtered white noise excitation from white noise with fillers,and takes themas random excitation with temporal and spatial correlations,and makes thesecorrelations be treated in a unified way.Through the discussion about thedistinction between the temporal and spatial correlations,it is pointed out that thebasic recurrence formulas of discrete analysis method for random vibration will notbe changed and the calculation procedure proposed in Ref.[4] can be directly used.
关键词
随机振动
载荷
空间相关
时间相关
discrete analysis
filtered white noise
spatial correltion temporal correlation
random vibration
random excitation
