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Real-time Hybrid Testing Using The Unconditionally Stable Explicitcr Integration Algorithm

机译：使用无条件稳定的显式积分算法进行实时混合测试

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摘要

Real-time hybrid testing combines experimental testing and numerical simulation, and provides a viable alternative for the dynamic testing of structural systems. An integration algorithm is used in real-time hybrid testing to compute the structural response based on feedback restoring forces from experimental and analytical substructures. Explicit integration algorithms are usually preferred over implicit algorithms as they do not require iteration and are therefore computationally efficient. The time step size for explicit integration algorithms, which are typically conditionally stable, can be extremely small in order to avoid numerical stability when the number of degree-of-freedom of the structure becomes large. This paper presents the implementation and application of a newly developed unconditionally stable explicit integration algorithm for real-time hybrid testing. The development of the integration algorithm is briefly reviewed. An extrapolation procedure is introduced in the implementation of the algorithm for real-time testing to ensure the continuous movement of the servo-hydraulic actuator. The stability of the implemented integration algorithm is investigated using control theory. Real-time hybrid test results of single-degree-of-freedom and multi-degree-of-freedom structures with a passive elastomeric damper subjected to earthquake ground motion are presented. The explicit integration algorithm is shown to enable the exceptional real-time hybrid test results to be achieved.
机译：实时混合测试将实验测试和数值模拟相结合，为结构系统的动态测试提供了可行的替代方案。实时混合测试中使用集成算法，根据来自实验和分析子结构的反馈恢复力来计算结构响应。显式集成算法通常比隐式算法更可取，因为它们不需要迭代，因此计算效率很高。当结构的自由度数变大时，显式积分算法的时间步长通常会非常小，以避免条件上的数值稳定性，这些时间步长通常在条件上是稳定的。本文介绍了一种新开发的用于实时混合测试的无条件稳定显式集成算法的实现和应用。简要回顾了集成算法的发展。实时测试算法的实施中引入了外推程序，以确保伺服液压执行器的连续运动。利用控制理论研究了所实现的集成算法的稳定性。给出了带有被动弹性阻尼器的单自由度和多自由度结构在地震地面运动下的实时混合测试结果。显示了显式集成算法，可以实现出色的实时混合测试结果。

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