Accelerated time history iteration method for offline real-time hybrid testing

IF 4.3 2区 工程技术 Q1 ENGINEERING, CIVIL Earthquake Engineering & Structural Dynamics Pub Date : 2024-04-30 DOI:10.1002/eqe.4133
Youming Guo, Peng Pan
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Abstract

Real-time hybrid testing (RTHT) is an efficient method to simulate the dynamic behavior of complex engineering systems. A novel offline RTHT method has been developed in recent years, wherein the computation of the numerical substructure and the loading of the experimental substructure are independent. Offline RTHT has obvious advantages in terms of accuracy, stability, and cost compared with conventional online RTHT. However, due to the excessive number of iterations, the application range of the existing offline RTHT methods is limited. This paper proposes an accelerated time history iteration (ATHI) method based on system identification and virtual iteration. A two-loop parameter optimization (TLPO) method is developed to obtain an accurate discrete transfer function. Virtual iterations are performed by replacing the real system with an identified transfer function, which can reduce the number of real iterations. Physical tests were performed on structures equipped with a tuned mass damper or active mass damper, where resonance, nonlinearity, closed-loop control, and measurement noise exist. The test results suggest that the real system can be accurately represented by the identified transfer function when adopting the TLPO method. The proposed ATHI successfully accelerates the convergence process while ensuring stability and accuracy.

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用于离线实时混合测试的加速时间历程迭代法
实时混合测试(RTHT)是模拟复杂工程系统动态行为的一种有效方法。近年来,人们开发了一种新颖的离线 RTHT 方法,该方法中数值子结构的计算和实验子结构的加载是独立的。与传统的在线 RTHT 相比,离线 RTHT 在精度、稳定性和成本方面具有明显优势。然而,由于迭代次数过多,现有离线 RTHT 方法的应用范围有限。本文提出了一种基于系统识别和虚拟迭代的加速时间历程迭代(ATHI)方法。开发了一种双环参数优化(TLPO)方法,以获得精确的离散传递函数。虚拟迭代是通过用识别的传递函数替换真实系统来进行的,这样可以减少实际迭代的次数。对装有调谐质量阻尼器或主动质量阻尼器的结构进行了实际测试,这些结构存在共振、非线性、闭环控制和测量噪声。测试结果表明,采用 TLPO 方法时,所识别的传递函数可以准确地表示真实系统。所提出的 ATHI 成功地加速了收敛过程,同时确保了稳定性和准确性。
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来源期刊
Earthquake Engineering & Structural Dynamics
Earthquake Engineering & Structural Dynamics 工程技术-工程:地质
CiteScore
7.20
自引率
13.30%
发文量
180
审稿时长
4.8 months
期刊介绍: Earthquake Engineering and Structural Dynamics provides a forum for the publication of papers on several aspects of engineering related to earthquakes. The problems in this field, and their solutions, are international in character and require knowledge of several traditional disciplines; the Journal will reflect this. Papers that may be relevant but do not emphasize earthquake engineering and related structural dynamics are not suitable for the Journal. Relevant topics include the following: ground motions for analysis and design geotechnical earthquake engineering probabilistic and deterministic methods of dynamic analysis experimental behaviour of structures seismic protective systems system identification risk assessment seismic code requirements methods for earthquake-resistant design and retrofit of structures.
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