大跨度桥梁施工监控的自适应系统研究
发布时间：2018-10-20 13:06
【摘要】：本文基于自适应控制系统的改进算法对大跨度桥梁施工监控进行了分析和研究。自适应控制是依据非线性系统分析方法的一种复杂反馈控制,在对象控制中表现为多变量时变的反馈控制。桥梁施工监控(特别是大跨度桥梁)是以现代控制理论为基础的一种自适应控制的复杂系统工程,其控制目标是确保施工及成桥的质量和安全。自适应控制方法的核心在于自适应模型的选择和使用,并针对桥梁施工过程选择合适的控制方法,使得其能够适应对象的非线性变化,并进行预测和调整,使其接近理论设计的目标。本文以安徽省大别山旅游扶贫快速通道龙井冲大桥和芜湖长江二桥跨无为矮塔斜拉桥为工程背景,采用自适应控制方法对桥梁施工过程进行了控制和分析。利用MIDAS有限元软件对桥梁施工进行阶段性分析,借助MATLAB软件对设计参数误差进行识别、估计与修正,使用最小二乘法、卡尔曼滤波法、灰色理论以及改进算法等对立模标高、预应力(斜索力)等参数进行实时调整,并对施工状态进行预测,使桥梁结构的实际状态与理想状态一致。根据不同类型桥梁的施工特点,本文提出了基于模型参考自适应控制理论的改进算法,对桥梁施工过程中的变形与内力进行预测,并将该方法应用于连续梁桥与斜拉桥的实际工程中。通过监控的实践证明,施工的合拢精度和内力精度满足设计要求,验证了该方法的可行性。
[Abstract]:Based on the improved algorithm of adaptive control system, the construction monitoring of long span bridges is analyzed and studied in this paper. Adaptive control is a kind of complex feedback control based on nonlinear system analysis method. It is shown as multivariable time-varying feedback control in object control. Bridge construction monitoring (especially long-span bridge) is a complex system engineering with adaptive control based on modern control theory. Its control goal is to ensure the quality and safety of construction and bridge. The core of the adaptive control method is the selection and use of adaptive model, and the selection of appropriate control method for the bridge construction process, so that it can adapt to the nonlinear changes of the object, and predict and adjust it. Bring it close to the goal of theoretical design. Taking Longjing Chong Bridge and Wuhu Yangtze River Bridge as the engineering background, adaptive control method is used to control and analyze the construction process of the bridge. The MIDAS finite element software is used to analyze the stage of bridge construction, and the MATLAB software is used to identify, estimate and modify the design parameter error, using the least square method, Kalman filtering method, grey theory and improved algorithm. The parameters such as prestress (skew cable force) are adjusted in real time and the construction state is forecasted to make the actual state of the bridge structure consistent with the ideal state. According to the construction characteristics of different types of bridges, an improved algorithm based on the model reference adaptive control theory is proposed to predict the deformation and internal force during the bridge construction. The method is applied to the practical engineering of continuous girder bridge and cable-stayed bridge. Through the practice of monitoring, it is proved that the closing precision and the internal force precision of the construction meet the design requirements, and the feasibility of the method is verified.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
[Abstract]:Based on the improved algorithm of adaptive control system, the construction monitoring of long span bridges is analyzed and studied in this paper. Adaptive control is a kind of complex feedback control based on nonlinear system analysis method. It is shown as multivariable time-varying feedback control in object control. Bridge construction monitoring (especially long-span bridge) is a complex system engineering with adaptive control based on modern control theory. Its control goal is to ensure the quality and safety of construction and bridge. The core of the adaptive control method is the selection and use of adaptive model, and the selection of appropriate control method for the bridge construction process, so that it can adapt to the nonlinear changes of the object, and predict and adjust it. Bring it close to the goal of theoretical design. Taking Longjing Chong Bridge and Wuhu Yangtze River Bridge as the engineering background, adaptive control method is used to control and analyze the construction process of the bridge. The MIDAS finite element software is used to analyze the stage of bridge construction, and the MATLAB software is used to identify, estimate and modify the design parameter error, using the least square method, Kalman filtering method, grey theory and improved algorithm. The parameters such as prestress (skew cable force) are adjusted in real time and the construction state is forecasted to make the actual state of the bridge structure consistent with the ideal state. According to the construction characteristics of different types of bridges, an improved algorithm based on the model reference adaptive control theory is proposed to predict the deformation and internal force during the bridge construction. The method is applied to the practical engineering of continuous girder bridge and cable-stayed bridge. Through the practice of monitoring, it is proved that the closing precision and the internal force precision of the construction meet the design requirements, and the feasibility of the method is verified.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U445.4
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