【作者】 谭凯；

【导师】 刘一江； 易伟建；

【作者基本信息】 湖南大学 ， 结构工程， 2005， 硕士

【摘要】 结构拟动力试验是目前应用最为广泛的结构抗震试验,也是国内外研究最多的结构抗震试验。本文以研究分析结构拟动力试验中的试验误差为背景,在土木工程结构拟动力试验方法和自动控制理论的基础上,针对多自由度结构拟动力试验系统控制上存在的结构耦合问题,采用MTS电液伺服加载系统进行多自由度混凝土框支剪力墙模型的位移耦合实验。研究在电液伺服加载系统负载(多自由度结构)情况下结构构件特性参数(结构刚度)随着试验的进程发生变化时试验系统的位移耦合。 全文对结构拟动力试验的基本原理、发展历史、试验系统和流程、误差问题以及研究进展进行了简要的介绍。重点分析了多变量电液伺服系统的动态特性以及系统结构,特别是耦合环节的传递函数,在理论上得出结构耦合和结构刚度的关系式。整个试验的进程包括弹性阶段、弹塑性阶段Ⅰ以及弹塑性阶段Ⅱ。本文对三个阶段的位移耦合情况都进行了分析,并结合结构刚度的变化情况以及结构拟动力试验的数值计算方法,初步分析了由于结构耦合而产生的试验误差。为了消除结构耦合的影响,实现对系统的最优化控制,减小结构拟动力试验误差,本文以经典控制理论为基础,采用对角矩阵法来实现多变量伺服系统的解耦控制。通过分析PID控制规律以及PID参数与结构负载参数的关系,重点研究了解耦控制的关键问题-数字PID控制器的设计,得出了便于计算机识别的算法。采用PID调节后的试验结果表明:系统在一定程度上消除了结构耦合的影响,达到了减小试验误差,实现系统最优化控制的目的。更多还原

【Abstract】 Structural pseudodynamic test is the most comprehensive structural seismic testing presently used; it is the most excessive structural seismic testing researched domestic and overseas too. In this paper, by researching and analyzing the testing error in the structural pseudodynamic test, based on the civil engineering structural pseudodynamic test methods and automatic control theories, the testing of displacement interaction have been conducted on the specimen of MDOF (multi-degrees-of-freedom) reinforced concrete shear walls frame by the MTS computer-actuator on-line system to the interaction of structures of MDOF structural pseudodynamic test system control. And researches the displacement interaction of testing system by peculiarity parameters of structural specimen (structural stiffness) are changing with development of testing under the computer-actuator on-line system connected with the structural specimen (MDOF structure).The total paper mainly introduces the elementary theories, the developmental history, the testing system and procedure, the testing error, the researching development of structural pseudodynamic test. It researches strongly the mobile peculiarity and system structure of multivariable electro-hydraulic servo system, extraordinarily the transfer function of interaction part, concludes the relationship formula of interaction of structures and structural stiffness on theory .The total procedure of testing include elastic phase, elastic-plastic phase I and elastic-plastic phase II. This paper analyzes the things of displacement interaction of three phases, by connecting the varieties of structural stiffness and the numerical calculation methods of the structural pseudodynamic test, analyzes elementarily the test error because of the interaction of structures. In order to eliminates the influence of the interaction of structures, realizes the most optimized control of system, minish error of the structural pseudodynamic test, the paper achieve decoupling controlling of multivariable electro-hydraulic servo system by adopting the method of diagonal matrix based on the sutra control theory. By analyzes the rule of PID control and the relation of the PID parameters and the parameters of structural loading, researches strongly the key of decoupling control-the design of numerical PID controller, obtain the arithmetic facility to the identify of computer. The result of test indicates by adopting PID adjusting: the system eliminates influence of the structural interaction更多还原