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拱坝变形分析与监控的小波和神经网络方法研究
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摘要
拱坝的变形受到多方面因素的影响,变形与各影响因子之间的关系是复杂
    的,高度非线性的映射关系。传统方法只能近似地描述变形与各影响因子之间的
    关系。而小波变换技术和神经网络理论能行之有效地解决这类问题。
    本文在对拱坝变形的影响因子进行系统分析的基础上,采用多分辨分析的方
    法对影响拱坝变形的温度、水位特征进行了分析。详细地分析了温度的周期特征,
    水位的一般特征。同时,对温度、水位的分解结果进行去噪,去除其高频噪声,
    然后重构提取温度、水位的典型特征结果,为大坝变形的预测监控做准备。采用
    最优正交小波基分解拱坝的变形资料,然后去除其高频噪声的影响,重构变形结
    果,并详尽地分析了拱坝变形的一般规律。
    本文抓住影响拱坝变形的主要影响因子——气温和水位,以及实测变形之间
    的间接关系,利用小波变换提取的信息和大坝变形信息作为输入,实测变形值作
    为输出,通过对模型的合理优化和有效的数据处理,成功建立了拱坝变形的 BP
    网络监控预测分析模型。通过模型的运算,得出了满意的结果,并且模型的预测
    精度较高。
    本文研究结果表明,小波变换技术是对大坝原型观测资料进行分析的有效手
    段;神经网络通过对问题的隐性描述,能有效地实现变形与各影响因子之间的复
    杂的高度非线性映射关系。因此,小波变换技术和神经网络理论在大坝的原型观
    测资料分析方面具有较强的工程适用性和较好的应用前景。
Arch dam deformation is effected by multi-factors, and their relations, high
    nonlinear mapping relation, are very complex. Conventional method can only
    approximately describe the relationship of the deformation and its impacting factors.
    However, Wavelet Transform technique and Artificial Neural Net Work method can
    effectively solve it.
     On the basis of systematic analysis the impact factors of arch dam deformation,
    the characteristics of temperature and water level of dam are analyzed by adopt the
    Multi-resolution analysis method. The characteristic of temperature and the general
    characteristic of water level are detailedly analyzed. At the same time, the
    high-frequency noise of the decomposed result of temperature and water level are
    removed. Then, their representative characteristics are composed, which is prepared
    for forecasting and monitoring the dam deformation. The optimum orthogonal
    wavelet bases decompose the datum of arch dam deformation. Removing the
    high-frequency noise, the result of deformation is composed. Then, the general rules
    of dam deformation are detailedly analyzed.
     In this paper, the main impact factor, i.e. temperature and water level that effect
    the arch dam deformation, and the indirect relationship of adjacent actual
    measurement of deformation, are grasped by qualitative analysis. The
    Back-Propagation Net-work monitor-forecasting analysis model, whose input is
    information getting from Wavelet transformation and actual measurement of dam
    deformation, is successfully founded though properly optimized the model and
    effectively datum processing. Calculating with this model, the satisfactory resolution
    is got. Results show that the forecasting precision of this model is high.
     The study resolution shows that Wavelet Transform technique is an effective
    analysis method in analyzing prototype measurement of dam, and that Artificial
    Neural Net Work can effectively realize complex and high nonlinear mapping
    relationship between deformation and each impact factor through recessive
    description way. Therefore, Wavelet Transform technique and Artificial Neural Net
    Work method will find its way in analyzing prototype measurement of dam, worthy of
    propagation in hydraulic engineering practice.
引文
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