Numerically disturbed shake table experimentation to examine nonlinear signal-based control
Numerically disturbed shake table experimentation to examine nonlinear signal-based control
复制标题
DOI：
10.3389/fbuil.2022.964394
复制
发表时间：
2022-08
期刊：
影响因子：
--
通讯作者：
R. Enokida;K. Ikago;K. Kajiwara
中科院分区：
文献类型：
--
作者：
R. Enokida;K. Ikago;K. Kajiwara
本研究引入了数值扰动实验来解决振动台实验中常见的振动台控制退化问题。这种退化是由实验中的非线性特性（例如地震损伤）引起的；然而，观察这种非线性特性是这些实验的主要目的。在所提出的数值扰动实验中，对结构进行数值模拟，并通过实时交互将其结构响应作为扰动信号反馈到物理域中的表。这使我们能够检查具有结构的振动台的控制性能，而无需在其上放置实际的结构。该实验对于将新的控制方法应用于振动台控制的情况是有益的，因为可以通过使用数值模拟在各种结构条件下安全有效地检查控制性能。所提出的实验应用于基于非线性信号的控制（NSBC）的振动台控制检查，该控制对非线性结构动力学具有非线性信号反馈作用，以及基于反演的控制（IBC），这是一种常见的前馈方法。在数值扰动实验中，NSBC在具有严重非线性特性的振动台上准确地实现了地震加速度记录，而IBC由于非线性特性而表现出控制退化。使用钢结构的实际振动台实验也获得了类似的结果。因此，所提出的数值扰动实验可以替代使用结构的振动台实验。
This study introduces a numerically disturbed experimentation to address the shake table control degradation commonly observed in shake table experiments. This degradation is caused by nonlinear characteristics, such as seismic damage, in the experiments; however, observing such nonlinear characteristics is a major purpose of these experiments. In the proposed numerically disturbed experimentation, a structure is numerically simulated, and its structural responses are fed back as the disturbance signal to the table in the physical domain via real-time interaction. This enables us to examine the control performance of a shake table with a structure, without having to place an actual structure on it. This experimentation is beneficial in cases wherein new control methods are applied for shake table control because the control performance can be examined safely and efficiently under various structural conditions by using numerical simulations. The proposed experimentation was applied to the shake table control examination of nonlinear signal-based control (NSBC), which has a nonlinear signal feedback action for nonlinear structural dynamics, as well as inversion-based control (IBC), which is a common feedforward method. In the numerically disturbed experiments, NSBC accurately realized a seismic acceleration record on the shake table with severe nonlinear characteristics, whereas IBC exhibited control degradation due to nonlinear characteristics. Similar results were obtained using actual shake table experiments with a steel structure. Therefore, the proposed numerically disturbed experimentation can be an alternative to shake table experiments using structures.