摘要
目前较先进的地震模拟试验多采用加速度迭代控制方法,针对该方法存在的更新速率低导致振动台在试件弹塑性阶段控制精度差的缺陷,提出一种地震模拟快速迭代控制方法。该方法在频域分段的基础上利用位移和加速度控制信号分别对低频段和中频段系统阻抗进行辨识,并设置不同的系统辨识参数,使得低频段系统阻抗具有较高的频率分辨率,而中频段系统阻抗具有较高的更新速率,并设计合成方法生成系统驱动信号。在浙江大学构建的振动台上进行试验表明:该控制方法可以将中频段系统阻抗的辨识周期缩短至5 s左右,在试件传递特性突然发生变化后,能在两帧试验时间内对系统传递特性进行较高精度的辨识,加速度波形复现时域相关系数能达到90%以上。
Acceleration iterative control is generally used in advanced earthquake simulation tests currently. To overcome the poor control precision of an elastoplastic specimen due to low update rate of this control, an earthquake simulation rapid iterative control was proposed. This control method was used to identify the system impedance within lower-frequency band and middle-frequency band, respectively with displacement and acceleration control signals based on different frequency ranges. The system identification parameters were set so that the system impedance within lower frequency band had a higher frequency resolution, while the system impedance within middle-frequency band had a higher update rate. The system drive signal was generated using synthetic methods. The experimental results obtained with Zhejiang University shaking tables indicated that this control can shorten the period of the system impedance identification to 5 seconds; using this control can get a higher identification precision after two earthquake simulation tests; even though the specimen transfer characteristics have sudden changes, the test acceleration correlation coefficient can reach 90%.
出处
《振动与冲击》
EI
CSCD
北大核心
2014年第18期43-49,共7页
Journal of Vibration and Shock
关键词
地震模拟
弹塑性
阻抗分段辨识
驱动信号合成
快速迭代控制
earthquake simulation
elastoplastie
impedance divided identification
drive signal synthesizing
rapid iterative eontrol
