Nonlinear substructuring control for parameter changes in multi-degree-of-freedom systems
Nonlinear substructuring control for parameter changes in multi-degree-of-freedom systems
复制标题
多自由度系统参数变化的非线性子结构控制
DOI：
10.1016/j.jsv.2017.06.029
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发表时间：
2017
影响因子：
4.7
通讯作者：
K. Kajiwara
中科院分区：
文献类型：
--
作者：
R. Enokida;K. Kajiwara
为了使线性子结构控制（LSC），特别是动态子结构系统（DSS）对非线性具有更强的鲁棒性，提出了非线性子结构控制（NLSC）。通过非线性单自由度（SDOF）系统的子结构试验，对基础隔震结构进行了数值和实验研究。本研究探讨NLSC在非线性多自由度系统之应用。开始，NLSC的非线性多自由度系统进行了讨论，并分析了其稳定性的纯时间延迟，这是一个关键因素，在许多子结构测试，应用Nyquist准则。其次，其控制器的设计和稳定性分析的数值和实验研究，通过子结构测试。在研究中，一个非线性四自由度系统受到地面运动被选为模拟系统的子结构试验。基于此仿真系统，三种类型的子结构试验进行了数值模拟;第一个模拟检查底层的物理子结构，第二个检查的地面和第一层，第三个只检查第一层。最后，利用一个由驱动器和橡胶支座组成的试验台，进行了一系列以底层为物理子结构的子结构试验。在这两个考试中，NLSC控制器的设计已经建立了非线性多自由度系统的子结构测试的效率。对于纯时滞的稳定性分析也被发现对预测非线性多自由度系统的子结构试验的不稳定条件是有用的。
Nonlinear substructuring control (NLSC) was developed to render linear substructuring control (LSC), particularly used in dynamically substructured system (DSS), more robust against nonlinearities. This NLSC was examined both numerically and experimentally via substructure tests of nonlinear single-degree-of-freedom (SDOF) systems demonstrating a base-isolated structure. This study examines the application of NLSC to nonlinear multi-degree-of-freedom (MDOF) systems. To begin, NLSC for nonlinear MDOF systems is discussed, and its stability with respect to a pure time delay, which is a critical element in many substructure tests, is analysed by applying the Nyquist criterion. Next, its controller design and stability analysis are numerically and experimentally examined via substructure tests. In the examination, a nonlinear 4DOF system subjected to a ground motion is selected as an emulated system for substructure tests. Based on this emulated system, three types of substructure tests are numerically simulated; the first simulation examines the ground floor as the physical substructure, the second one examines the ground and first floors, and the third one examines only the first floor. Finally, by using a test rig consisting of an actuator and a rubber bearing, a series of substructure experiments targeting the ground floor as the physical substructure was implemented. In both examinations, the design of the NLSC controller has established its efficiency in substructure tests of nonlinear MDOF systems. A stability analysis with respect to pure time delays has been also found useful for predicting instability conditions of substructure tests with nonlinear MDOF systems.