摘要
实时混合模拟是一种新型而有效的抗震试验方法。其中,作动器作为维系试验子结构和数值子结构的边界条件,其对指令位移的追踪直接影响到试验的准确性,而现有的作动器追踪精度的评价方法均基于时域分析。为克服时域评价方法的缺陷,该文提出了一种作动器追踪精度的基于傅里叶变换的频域评价方法,其优点是仅需试验的输入和输出,且能同时反映输入和输出的时间误差(时滞)和幅值误差。为克服快速傅里叶变换以及频谱泄漏对分析结果的影响,提出了一种数据加窗的处理方法。在一个由作动器、阻尼器和反力装置构成的实时混合模拟试验系统中,分别输入已知的正弦波和随机波并进行频域分析,验证了该频域评价方法的有效性。
Real-time hybrid simulation is a novel and effective technique for seismic tests. Servo-hydraulic actuators play an important role in a real-time hybrid simulation, where they serve to maintain the boundary conditions between the experimental and analytical substructures. Accurate actuator tracking directly affects the reliability of hybrid simulation results. Existing methods for actuator tracking assessment are often based on time-domain analysis. This paper proposes a frequency-domain actuator tracking method, based on use of the Fourier transform, which only requires the input and the output of the actuator and can simultaneously evaluate the phase delay and the amplitude error. To minimize the effect of the fast Fourier transform(FFT) and spectrum leakage on the analysis results, a Hann window is used to improve the accuracy of the method. The effectiveness of the proposed method is validated experimentally using a real-time hybrid simulation system which subjects the actuator to predefined sinusoidal and random signals.
出处
《工程力学》
EI
CSCD
北大核心
2014年第4期171-177,共7页
Engineering Mechanics
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项目(56237845)
美国国家自然科学基金项目(1227962)
关键词
实时混合模拟
频域
作动器位移追踪
评价方法
试验验证
real-time hybrid simulation
frequency domain
actuator tracking
evaluation method
experimental validation
