NONLINEAR SYSTEM MODELING AND VELOCITY FEEDBACK COMPENSATION FOR EFFECTIVE FORCE TESTING
NONLINEAR SYSTEM MODELING AND VELOCITY FEEDBACK COMPENSATION FOR EFFECTIVE FORCE TESTING
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DOI：
10.1061/(asce)0733-9399(2005)131:3(244
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发表时间：
2005-03
期刊：
影响因子：
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通讯作者：
Jian Zhao;C. Shield;Catharine French;T. Posbergh
中科院分区：
文献类型：
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作者：
Jian Zhao;C. Shield;Catharine French;T. Posbergh
有效力测试（EFT）是一种可用于向大型结构模型施加实时地震荷载的测试程序。EFT方法的实现需要对致动器进行速度反馈补偿，以便将力准确地施加到测试结构上。伺服系统中的非线性对速度反馈补偿和测试结果有显著影响，当存在大流量需求时，这可能是由大的结构速度和/或施加到测试结构上的大的力引起的。本文提出了一种非线性伺服系统模型，并在此基础上提出了一种非线性补偿方案。对模型和补偿方案进行了实验验证。结果表明，该模型能准确地描述伺服系统的动态特性，并通过非线性速度反馈补偿，实现了EFT方法的实时动态测试。
Effective force testing (EFT) is a test procedure that can be used to apply real-time earthquake loads to large-scale structural models. The implementation of the EFT method requires velocity feedback compensation for the actuators in order to apply forces accurately to test structures. Nonlinearities in the servosystem have a significant impact on the velocity feedback compensation and test results when large flow demands are present, which can be caused by large structural velocities and/or large forces applied to the test structure. This paper presents a nonlinear servosystem model, upon which a nonlinear compensation scheme is proposed. The model and compensation scheme are experimentally verified. The results indicate that the proposed model accurately describes the servosystem behavior, and with the nonlinear velocity feedback compensation, real-time dynamic testing can be conducted using the EFT method.