基于自适应时滞补偿的实时混合试验方法与验证
发布时间：2019-06-17 14:20
【摘要】：在建筑抗震技术与理论不断发展的过程中,结构抗震试验技术具有举足轻重的地位。现代建筑结构日趋大型化和复杂化,新型抗震设计理论、结构构造形式以及隔震与耗能减震技术的涌现,为抗震试验技术提出了新的挑战。实时混合试验由拟动力试验发展而来,能够一定程度上解决原型结构足尺试验以及率相关试件的试验验证问题,自1992年被提出以来得到了快速发展。时滞问题是实时混合试验的核心问题。传统时滞补偿方法往往假定试验中时滞不变,然而加载系统的非线性以及试件性能的变化可能导致系统时滞变化,使得此类方法性能不够理想。针对变时滞实时混合试验,本文提出了基于模型参数在线识别的自适应时滞补偿方法。该方法采用离散模型描述伺服系统,通过在线参数估计确定系统状态,从而对伺服系统进行在线时滞补偿。本文的主要研究内容如下:(1)以自校正控制技术为基础,结合实时混合试验加载系统的简化离散模型,提出了基于加载系统离散模型参数在线识别的自适应时滞补偿方法,采用数值模拟评价了该方法在较大控制步长实时混合试验中的补偿效果。同时,离散模型参数数目作为影响时滞补偿效果的主要因素,分析了其在不同工况下对时滞补偿效果的影响;(2)分析了较小加载控制步长实时混合试验中,所提出的自适应时滞补偿方法效果变差的原因,并提出了相应的改进措施,使该时滞补偿方法具有更加广泛的适用范围。同时,针对不同的试验工况,评价了不同离散模型的改进自适应时滞补偿方法的补偿效果,验证了改进后时滞补偿方法的可行性;(3)建立了MTS-dSPACE实时混合试验的试验平台,规范了自适应时滞补偿实时混合试验的流程,并以钢结构柱的实时混合试验验证了本文提出的时滞补偿方法。
[Abstract]:In the process of continuous development of building seismic technology and theory, structural seismic test technology plays an important role. With the increasing scale and complexity of modern building structures, the emergence of new seismic design theory, structural structure form and isolation and energy dissipation technology poses a new challenge to seismic test technology. Real-time hybrid test, developed from quasi-dynamic test, can solve the problem of full-scale test of prototype structure and test verification of rate-related specimens to a certain extent, and has been developed rapidly since it was put forward in 1992. The problem of time delay is the core problem of real-time hybrid test. The traditional time delay compensation methods often assume that the delay is invariant in the test, however, the nonlinear of the loading system and the change of specimen performance may lead to the change of time delay of the system, which makes the performance of this method not ideal. In this paper, an adaptive time delay compensation method based on-line identification of model parameters is proposed for real-time hybrid experiments with variable time delays. In this method, the discrete model is used to describe the servo system, and the state of the servo system is determined by on-line parameter estimation, so as to compensate the servo system for on-line time delay. The main contents of this paper are as follows: (1) based on the self-tuning control technology and the simplified discrete model of real-time hybrid test loading system, an adaptive time-delay compensation method based on-line identification of discrete model parameters of loading system is proposed, and the compensation effect of this method in real-time hybrid test with large control step is evaluated by numerical simulation. At the same time, the number of parameters of discrete model is the main factor affecting the effect of time delay compensation, and its influence on time delay compensation effect under different working conditions is analyzed. (2) the reason why the proposed adaptive time delay compensation method becomes worse in the real time hybrid test of small loading control step size is analyzed, and the corresponding improvement measures are put forward to make the time delay compensation method have a wider range of application. At the same time, according to different test conditions, the compensation effect of the improved adaptive time delay compensation method for different discrete models is evaluated, and the feasibility of the improved time delay compensation method is verified. (3) the test platform of MTS-dSPACE real time hybrid test is established, the flow of adaptive time delay compensation real time hybrid test is standardized, and the delay compensation method proposed in this paper is verified by the real time mixing test of steel structure columns.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU317
本文编号：2501047
[Abstract]:In the process of continuous development of building seismic technology and theory, structural seismic test technology plays an important role. With the increasing scale and complexity of modern building structures, the emergence of new seismic design theory, structural structure form and isolation and energy dissipation technology poses a new challenge to seismic test technology. Real-time hybrid test, developed from quasi-dynamic test, can solve the problem of full-scale test of prototype structure and test verification of rate-related specimens to a certain extent, and has been developed rapidly since it was put forward in 1992. The problem of time delay is the core problem of real-time hybrid test. The traditional time delay compensation methods often assume that the delay is invariant in the test, however, the nonlinear of the loading system and the change of specimen performance may lead to the change of time delay of the system, which makes the performance of this method not ideal. In this paper, an adaptive time delay compensation method based on-line identification of model parameters is proposed for real-time hybrid experiments with variable time delays. In this method, the discrete model is used to describe the servo system, and the state of the servo system is determined by on-line parameter estimation, so as to compensate the servo system for on-line time delay. The main contents of this paper are as follows: (1) based on the self-tuning control technology and the simplified discrete model of real-time hybrid test loading system, an adaptive time-delay compensation method based on-line identification of discrete model parameters of loading system is proposed, and the compensation effect of this method in real-time hybrid test with large control step is evaluated by numerical simulation. At the same time, the number of parameters of discrete model is the main factor affecting the effect of time delay compensation, and its influence on time delay compensation effect under different working conditions is analyzed. (2) the reason why the proposed adaptive time delay compensation method becomes worse in the real time hybrid test of small loading control step size is analyzed, and the corresponding improvement measures are put forward to make the time delay compensation method have a wider range of application. At the same time, according to different test conditions, the compensation effect of the improved adaptive time delay compensation method for different discrete models is evaluated, and the feasibility of the improved time delay compensation method is verified. (3) the test platform of MTS-dSPACE real time hybrid test is established, the flow of adaptive time delay compensation real time hybrid test is standardized, and the delay compensation method proposed in this paper is verified by the real time mixing test of steel structure columns.
【学位授予单位】：哈尔滨工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TU317
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