基于前馈修正-总误差补偿的频带扩展式复合振动台控制方法研究

STUDY ON AN OVERALL ERROR COMPENSATION CONTROL METHOD BASED ON FEEDFORWARD CORRECTION FOR A FREQUENCY BANDWIDTH EXPANSION COMPOUND SHAKING TABLE

  • 摘要: 频带扩展式复合振动台(FBECST)作为一种新型地震模拟振动台,为同时实现长行程、宽频带激励提供了有效途径。FBECST由长行程振动台(主台)和高频振动台(扩展台)上下叠合而成,系统复杂度高。设计合适的补偿控制方法是实现FBECST高精度跟踪控制的前提。该文提出了一种基于前馈修正的总误差补偿控制方法,并分析了所提出方法的收敛性和稳定性;结合增益裕度理论给出了总误差反馈增益的取值方法;以逆补偿控制(IC)和离线迭代控制(OIC)为基准方法,对比验证了所提出方法的有效性和优势。一系列试验结果表明:所提出方法在时域和频域上的性能表现均优于IC和OIC,尤其在地震波的复现能力方面,所提出方法的优势更为显著。所提出方法仅需1次辨识和算法设计即可实现对FBECST系统的高精度补偿控制,对待测试件的影响极小。该文可为FBECST基于模型的补偿控制方法研究及工程应用提供有力支持。

     

    Abstract: The frequency bandwidth expansion compound shaking table (FBECST), as a new type of seismic simulation shaking table, provides an effective solution for achieving long-stroke and wide-band excitation. The FBECST is composed of a long-stroke shaking table and a high-frequency shaking table stacked vertically, which has a high system complexity. It is a prerequisite to design appropriate compensation control methods for achieving high-precision tracking control of FBECST. An overall error compensation control method based on feedforward correction is proposed, and the convergence and stability are analyzed. A method for determining the overall error feedback gain is proposed based on the gain margin theory. Taking the inverse compensation (IC) and offline iterative control (OIC) as baseline methods, the effectiveness and advantages of the proposed method are verified by comparison. A series of experiments demonstrate that the proposed method performs better than IC and OIC in both time-domain and frequency-domain, particularly in seismic wave reproduction, where its advantages are especially pronounced. The proposed method achieves high-precision compensation control of the FBECST system through only one identification and algorithm design process, minimizing its influence on the specimen. This paper offers robust support for the study and engineering application of model-based compensation control methods of FBECST.

     

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