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混凝土重力坝振动参数识别研究
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摘要：本文基于最优控制解的理论，建立了引入先验约束条件的混凝土重力坝动态参数识别模型，提出了求解该模型的约束变尺度方法。以某大坝空库情形为例，在振动观测数据不完全的条件下，对本文所提出的动态材料参数识别方法进行考察。识别结果表明，本文方法不仅具有较高的计算精度和良好的数值稳定性，并且具有一定的抑制数据噪音的能力。在只有一阶圆频率和几个固定点处有一阶振型观测数据的情况下，可以可靠地识别出坝体混凝土和基础岩石的动弹性模量。从而为识别混凝土坝体和岩石基础弹性常数提供了一条新的有效途径。
关键词：振动参数 参数识别 混凝土重力坝 约束变尺度方法
Abstract ：Based on the theory of optimal control solution, the parameters identification model was built to estimate the elastic material parameters of concrete dam according to the model data of dam prototype experiment. The priori-constrained information was considered in the present model. And the constrained variable metric algorithm was proposed to solve it. The present process was inspected through using the incomplete measuring data of the concrete gravity dam under the condition of empty reservoir. Numerical results show that the present method not only has high precision and good stability, but also has powerful capability to restrain noise of measurements. The elastic modulus of dam concrete and that of rock basement could be reliably identified only using the first order frequency and the first order vibration mode values at several fixed points in the dam. Consequently a new reliably approach to identify dynamic elastic modulus of dam concrete and that of rock basement.
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