基于加加速度的地震模拟振动台控制技术
A New Control Technology of Shaking Table Based On the Jerk
作者：李小军(北京工业大学 工程抗震与结构诊治北京市重点实验室, 北京 100124;中国地震局 地球物理研究所, 北京 100081)；李芳芳(北京工业大学 工程抗震与结构诊治北京市重点实验室, 北京 100124)；纪金豹(北京工业大学 工程抗震与结构诊治北京市重点实验室, 北京 100124)；王巨科(北京工业大学 工程抗震与结构诊治北京市重点实验室, 北京 100124)
Author：LI Xiaojun(Beijing Key Lab. of Earthquake Eng. and Structural Retrofit, Beijing Univ. of Technol., Beijing 100124, China;Inst. of Geophysics, China Earthquake Administration, Beijing 100081, China)；LI Fangfang(Beijing Key Lab. of Earthquake Eng. and Structural Retrofit, Beijing Univ. of Technol., Beijing 100124, China)；JI Jinbao(Beijing Key Lab. of Earthquake Eng. and Structural Retrofit, Beijing Univ. of Technol., Beijing 100124, China)；WANG Juke(Beijing Key Lab. of Earthquake Eng. and Structural Retrofit, Beijing Univ. of Technol., Beijing 100124, China)
收稿日期：2018-03-08 年卷（期）页码：2018,50(3):64-72
期刊名称：工程科学与技术
Journal Name：Advanced Engineering Sciences
关键字：地震模拟试验;振动台;三参量控制;加加速度;有效频带
Key words：seismic simulation test;shaking table;three-variable control;jerk;effective frequency band
基金项目：国家自然科学基金资助项目（51278013；51738001）
中文摘要
地震模拟振动台试验是工程结构地震反应模拟和抗震性能观测的直接有效的手段，但由于电液伺服地震模拟振动台系统具有复杂的非线性，当伺服阀90°相移频率与系统油柱共振频率比较接近时，伺服阀特性对振动台系统特性有较大影响，严重影响系统的有效频带范围。现有的电液伺服地震模拟振动台系统的有效频带多为0.4～50 Hz，不足以满足大比例缩尺结构抗震试验的需求。为减小现有电液伺服地震模拟振动台系统的伺服阀特性对系统性能的影响和拓宽振动台系统的有效频带，在三参量控制的基础上，将加加速度反馈信号和加加速度前馈信号引入控制环节，形成一种基于加加速度的地震模拟振动台多参量控制算法。对所提出的控制算法的控制效果进行了理论推导和系统仿真分析，揭示了加加速度反馈可降低系统油柱共振频率并减小伺服阀特性对振动台系统性能的影响，而加加速度前馈使得系统的有效频带由三参量控制下的0.35～54 Hz拓宽至0.35～64 Hz，表明所提出的基于加加速度的地震模拟振动台多参量控制算法明显改善了地震模拟振动台的控制性能。
英文摘要
Shaking table test is a direct and effective means of seismic response simulation and seismic performance observation of engineering structures,but because the electro-hydraulic servo shaking table system is complex nonlinear system,the performance of shaking table system is apparently affected by the servo valve when the 90° phase-shift frequency of the servo valve is near to the oil-column resonance frequency of shaking table system,so that the effective frequency band of shaking table system is severely affected.The effective frequency band of existing electro-hydraulic servo shaking table is generally from 0.4 Hz to 50 Hz,which is not enough to satisfy the demand of the seismic test of large reduced scale structure.In order to decrease the adverse effect of the servo valve of existing electro-hydraulic servo shaking table system on the system performance,and to broaden the effective frequency band of existing shaking table system,a new control algorithm was proposed by introducing the jerk feedback and jerk feed-forward into the controlling unit on the basis of the three-variable control algorithm.The control effect of the proposed control algorithm was deduced theoretically and analyzed by the system simulation.It was revealed that the oil-column resonance frequency was reduced by the jerk feedback so that the influence of servo valve characteristics on the system performance was decreased,and the effective frequency band of shaking table system was widen from 0.35~54 Hz for the three-variable control algorithm to 0.35~64 Hz for the jerk feed-forward control algorithm,and it was proved that the control performance of the shaking table system was obviously improved by the proposed control algorithm.
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