摘要
实时子结构实验中,使用液压伺服作动器作为加载设备时会出现作动器响应的时滞问题。根据作动器的动力特性,提出液压伺服作动器阶跃响应的双线性简化模型。基于该模型,以OS法(Operator-Splittingmethod)和中心差分法为例,利用谱半径方法分析了作动器时滞及其补偿对实验稳定性的影响。分析结果表明,作动器时滞使实验的稳定性降低,三阶外插补偿可以提高实验的稳定性。此外,分析结果也表明OS法的稳定性好于中心差分法。
In real-time substructure testing （RST） with a hydraulic actuator as the loading devices, there is an inevitable time delay of actuator response. This paper introduces a bilinear step response model based on the basic dynamics of an actuator. With this model, the effects of time delay and compensation of integration methods in RST are analyzed using spectrum radius method. The specific time stepping methods under investigation are the operator-splitting method and the central difference integration method. The analysis results show that the time delay will reduce the stability of RST response, while the 3rd-order polynomial compensation can improve .the stability effectively. The results also show that the stability of the operating-splitter method is better than that of the central difference method.
出处
《工程力学》
EI
CSCD
北大核心
2007年第2期9-14,8,共7页
Engineering Mechanics
基金
国家自然科学基金(50338020)
国家高科技发展计划(863计划子课题)(2003AA602150)
关键词
结构实验技术
实时子结构实验
时滞
补偿
OS法
中心差分法
seismic testing
real-time substructure testing
delay
compensation
operator-splitting method
central difference method
