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Online hybrid test by internet linkage of distributed test-analysis domains

机译：通过互联网链接分布式测试分析域的在线混合测试

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摘要

Online hybrid tests (called the online tests), particularly when combined with substructuring techniques, are able to conduct large-scale tests. An extension of this technique is to combine multiple loading tests conducted in remote locations and to integrate the tests with large numerical analysis codes. In this study, a new Internet online test system is developed in which a physical test is conducted in one place, the associated numerical analysis is performed in a remote location, and the two locations communicate over the Internet. To implement the system, a technique that links test and analysis domains located at different places is proposed, and an Internet data exchange interface is devised to allow data communication across Internet. A practical method that utilizes standard protocols implemented by operating systems for sharing files and folders is adopted to ensure stable and robust communication between remotely located servers that commonly protect themselves by strict firewalls. To combine the online test with a finite element program formulated in an incremental form and adopting an implicit integration scheme, a tangent stiffness prediction procedure is proposed. In this procedure, a tangent stiffness is estimated based on a few previous steps of experimental data. Using the system devised, tests on a base-isolated structure were carried out. Here, the base-isolation layer was taken as the tested part and tested in Kyoto University, Japan, and the superstructure was modelled by means of a finite element program and analysed in a computer located in Osaka University. A series of physical Internet online tests were carried out, with the integration time interval and the method of tangent stiffness prediction as the major parameters. The tests demonstrated that the Internet communication was very stable and robust, without malfunctions. The proposed method of stiffness prediction was effective even when the experimental hysteresis curves exhibited complex behaviour, thereby ensuring accurate simulation for the earthquake response of the entire structure.
机译：在线混合测试（称为在线测试），尤其是与子结构技术结合使用时，能够进行大规模测试。该技术的扩展是将在远程位置执行的多个负载测试组合在一起，并将这些测试与大型数值分析代码集成在一起。在这项研究中，开发了一种新的Internet在线测试系统，其中在一个地方进行了物理测试，在远程位置执行了相关的数值分析，并且两个位置通过Internet进行通信。为了实现该系统，提出了一种链接位于不同位置的测试和分析域的技术，并设计了Internet数据交换接口以允许跨Internet进行数据通信。采用一种实用的方法，该方法利用操作系统实现的标准协议来共享文件和文件夹，以确保通常由严格的防火墙保护自己的远程服务器之间的稳定可靠的通信。为了将在线测试与以增量形式制定的有限元程序结合起来并采用隐式积分方案，提出了切线刚度预测程序。在此过程中，将基于先前的实验数据的一些步骤来估算切线刚度。使用设计的系统，对基本隔离的结构进行了测试。在此，将基础隔离层作为测试部分并在日本京都大学进行了测试，并通过有限元程序对上部结构进行了建模，并在大阪大学的计算机中对其进行了分析。以积分时间间隔和切线刚度预测方法为主要参数，进行了一系列物理互联网在线测试。测试表明，Internet通信非常稳定和健壮，没有故障。所提出的刚度预测方法即使在实验磁滞曲线表现出复杂的行为时也是有效的，从而确保了对整个结构的地震响应的准确模拟。

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