摘要
为研究实时混合模拟频域评价方法的物理意义,通过数值模拟和实验室试验,分别计算了线性结构和非线性结构在整个试验以及各个频率下的幅值、相位(时滞)和权重.研究发现,各频率上的幅值、等效时滞按照权重加权可以得到整个试验的幅值、等效时滞.因此,实时混合模拟频域评价方法的物理意义实际上是计算各个频率上的幅值和相位(时滞),并根据输入信号各个频率幅值平方的权重进行加权得到试验的幅值和相位(时滞).由于权重的影响,频域评价结果受输入中低频成分的控制;对于非线性结构,需注意虚假时滞对计算结果的影响.
In order to investigate the physical significance of the frequency-domain evaluation method for real-time hybrid simulation, numerical and laboratory tests are conducted on linear and nonlinear structures. The parameters, such as amplitude, phrase （delay） and weights, with regards to the whole tests and to each frequency component, are calculated respectively. The results show that the amplitude and equivalent delay of the whole test can be obtained from the weighted sum of the amplitude and equivalent delay of each frequency. Therefore, the frequency-domain evaluation method in nature is to calculate the amplitude and phrase （delay） of each frequency and to take the weighted sum as the amplitude and phrase （delay） of the test, in which the square of the amplitude of each frequency is taken as weighting coefficient. Due to different weights of various frequency components, the results of the evaluation method are dominated by the low-frequencies components of the input. In the calculation of equivalent delay, the effect of the false delay should be considered espe- cially for nonlinear structures.
出处
《东南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2013年第5期923-927,共5页
Journal of Southeast University：Natural Science Edition
基金
混凝土及预应力混凝土结构教育部重点实验室开放课题基金资助项目(CPCSME2010-03)
关键词
实时混合模拟
频域
评价方法
物理意义
权重
real-time hybrid simulation
frequency-domain
evaluation method
physical meaning
weight
