【摘要】：在建筑抗震技術(shù)與理論不斷發(fā)展的過程中,結(jié)構(gòu)抗震試驗技術(shù)具有舉足輕重的地位�，F(xiàn)代建筑結(jié)構(gòu)日趨大型化和復雜化,新型抗震設(shè)計理論、結(jié)構(gòu)構(gòu)造形式以及隔震與耗能減震技術(shù)的涌現(xiàn),為抗震試驗技術(shù)提出了新的挑戰(zhàn)。實時混合試驗由擬動力試驗發(fā)展而來,能夠一定程度上解決原型結(jié)構(gòu)足尺試驗以及率相關(guān)試件的試驗驗證問題,自1992年被提出以來得到了快速發(fā)展。時滯問題是實時混合試驗的核心問題。傳統(tǒng)時滯補償方法往往假定試驗中時滯不變,然而加載系統(tǒng)的非線性以及試件性能的變化可能導致系統(tǒng)時滯變化,使得此類方法性能不夠理想。針對變時滯實時混合試驗,本文提出了基于模型參數(shù)在線識別的自適應(yīng)時滯補償方法。該方法采用離散模型描述伺服系統(tǒng),通過在線參數(shù)估計確定系統(tǒng)狀態(tài),從而對伺服系統(tǒng)進行在線時滯補償。本文的主要研究內(nèi)容如下:(1)以自校正控制技術(shù)為基礎(chǔ),結(jié)合實時混合試驗加載系統(tǒng)的簡化離散模型,提出了基于加載系統(tǒng)離散模型參數(shù)在線識別的自適應(yīng)時滯補償方法,采用數(shù)值模擬評價了該方法在較大控制步長實時混合試驗中的補償效果。同時,離散模型參數(shù)數(shù)目作為影響時滯補償效果的主要因素,分析了其在不同工況下對時滯補償效果的影響;(2)分析了較小加載控制步長實時混合試驗中,所提出的自適應(yīng)時滯補償方法效果變差的原因,并提出了相應(yīng)的改進措施,使該時滯補償方法具有更加廣泛的適用范圍。同時,針對不同的試驗工況,評價了不同離散模型的改進自適應(yīng)時滯補償方法的補償效果,驗證了改進后時滯補償方法的可行性;(3)建立了MTS-dSPACE實時混合試驗的試驗平臺,規(guī)范了自適應(yīng)時滯補償實時混合試驗的流程,并以鋼結(jié)構(gòu)柱的實時混合試驗驗證了本文提出的時滯補償方法。
[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.
【學位授予單位】：哈爾濱工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TU317

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