用交集域优选法辨识堆石坝材料参数

应用岩土力学、数理统计等理论，对鲁布革风化料心墙堆石坝变形观测资料进行了细致的分析，建立了数学模型，并将变形合理分为填筑分量，水压分量和时效分量。通过对材料各参数与变形之的关系分析和大量的有限元计算，按照交集域优选法的思想，辨识鲁布革堆石坝各区材料的非线性参数，结果令人满意。     

风力机参数的可辨识分析

风力机是风电机组吸收和转化风能的关键设备,准确的模型和参数是机组优化运行和控制的基础。文中基于风力机常用的高精度数学模型,运用计及实际运行工况的风力机的可测量量,进行参数的可辨识性理论分析,结果表明风力机的参数可辨识。     

同步水轮发电机组的机械参数辨识

选取特定的数学模型进行同步水轮发电机组机械参数可辨识性分析，得出该模型下可惟一辨识的结论。通过辨识算例有效地辨识出了同步水轮发电机组的机械参数，验证了数学模型选择的可用性，为水轮机机械参数的辨识奠定了理论基础。     

含有非线性环节的发电机励磁系统参数辨识

提出了一种基于遗传算法的励磁系统参数辨识方法，通过建立待辨识励磁系统的传递函数结构模型，以励磁系统的实际输入作为模型的输入，以实际励磁系统和模型的输出误差最小作为目标，利用遗传算法对模型参数进行优化调整，最终得到满足误差要求的励磁系统参数。该方法的优点在于解决了目前电力系统中常用的辨识方法无法对非线性环节进行有效辨识的问题；且根据输入输出采样数据直接在时域上进行参数辨识, 方法简便,直接得到传递函数框图环节参数，无需转换。在MATLAB下的数字仿真和现场试验结果均表明，该算法能较精确地辨识出包括非线性环节在内的励磁系统模型各个环节的参数。     

混沌优化用于电力系统静态负荷模型参数辨识

提出了一种应用混沌优化方法进行电力系统静态负荷模型参数辨识的新策略。混沌优化方法利用混沌变量的随机性、规律性、遍历性寻优，能够克服传统的基于梯度寻优的辨识方法容易陷入局部极小点的不足，而且方法简单、快速、易于掌握。实际算例的结果证实了混沌优化方法用于电力系统静态负荷模型辨识的有效性。     

变压器绕组变形诊断中的等效模型参数辨识

提出利用变压器频响试验数据，来辨识其等效模型的参数，以此诊断变压器绕组变形 。方法是：首先根据变压器电压传递函数和入端导纳函数分子、分母系数来粗定参数，然后 把这些粗定的参数作为模型参数优化的初始值，再运用“归一化”和Gauss-Newton优化方法 消除误差，确定模型参数的准确值；最后可以通过辨识模型参数的变化来诊断绕组变形。该 方法在模型变压器上取得了较好的效果。     

基于小波变换和Prony算法的同步电机参数辨识

将小波变换应用于同步电机瞬态参数测量，通过对采集到的同步电机三相突然短路电流进行小波变换，降低了信号的采集噪声，分离出了短路电流中的直流分量和基波电流分量,辨识出电机的瞬态参数和非周期分量时间常数，并提出利用扩展的Prony算法辨识电机的超瞬态参数。仿真分析和实机试验表明了所提出的方法是有效的。     

浅谈水电厂调速系统建模参数辨识试验

随着近几年国内各大水电厂大型机组的投产,电力系统对水电机组调速系统建模试验越来越重视,尤其是对研究调速系统精准的参数模型对电力系统稳定性有何影响,该试验有着重要的数据支撑和分析意义。为了更规范、正确地运用现代科技手段掌握目前各大水电厂调速系统模型,笔者根据多年的现场实施经验,并结合小湾电厂参数辨识试验数据和自身调速设备的控制和配置特点,提出了一些自己的思考和一些改进性建议。希望能为当前大型水电机组新型水轮机调速器的参数辨识研究和现场实施方法、分析,提供一定参考。     

基于轨迹灵敏度的负荷参数辨识范围调整方法

实践表明,参数辨识范围的选取对参数的辨识效果影响很大。在分析负荷模型参数对所吸收功率的轨迹灵敏度的基础上,提出了负荷模型参数辨识范围的调整方法。首先根据动态过程中轨迹灵敏度的大小选择要调整的参数对象,然后进一步依据动态轨迹灵敏度的变化特点调整参数的辨识范围,从而达到提高负荷辨识精度的目的。实际例子充分表明了这种方法的有效性。     

洮河流域洪水统计参数变化规律分析

采用数理统计方法计算的统计参数不仅要进行合理性检查多方比较，还应对其变化规律及成固有进一步的了解。笔者简述了洮河流域的基本特征和暴雨洪水情况，以干流控制站为主，分析了洪水均值及其变差系数Cv值随历时与面积变化的规律和特点。     

ADJOINT METHOD OF PARAMETER IDENTIFICATION FOR SOME NON- LINEAR REACTION-DIFFUSION SYSTEMS

This paper deals with the problem of determining two unknown parameters of some nonlinear reaction-diffusion models. These reaction-diffusion models are derived from applications in the groundwater flow transport, environ mental sciences, gas dynamics, heat and mass transfer, industrial automatization and some other engineering technological fields. The adjoint method based on the variational principle is a relatively new optimal control method. It is used in the identification of the unknown diffusion coefficient, and some coefficients of the nonlinear sink or source terms in these systems.At first, the problem is transferred into an optimization problem of minimizing a functional, and the adjoint equations of the governing equations are derived from the adjoint method.Then, the formulas are given to calculate the gradient of the objective function with respect to the couple of unknown parameters. At last, an iterative gradient-based optimization algorithm is presented for solving the optimization problem. A numerical example is offered in the end. It shows the effectiveness of the proposed approach.     

土石坝变形数学模型研究

研究土石材料的非线性、应力路径以及流变等对土石坝变形的影响，提出新的土石坝变形数学模型及迭代建模方法，算例分析表明新模型提高了拟合精度，研究工作使土石坝变形数学模型趋于合理。     

大坝安全监控模型中灰参数的识别

在对大坝的观测数据建立模型时，模型本身是不确定的，模型的输入也 是不确定的。文中从灰色系统的基本原理出发，对显式结构模型的灰参数进行了识别，确定 了灰参数的中点值和半径值，然后利用获得的灰参数的中点值和半径值对观测数据进行了预 测，给出了预测值的中点值和变化范围。     

NUMERICAL SIMULATIONS OF WAVE-INDUCED SHIP MOTIONS IN TIME DOMAIN BY A RANKINE PANEL METHOD

A time domain prediction of wave-induced ship motions by a Rankine panel method is investigated. Linear boundary conditions on free surface and mean wetted body surface are adopted, while the numerical damping method is used for the radiation conditions. The motions of two ships in regular head waves are computed by the present method. The related numerical results are compared with the experiment data and those from linear strip theory. The comparison shows satisfactory agreements for pitch and heave transfer functions.     

用结构法分析研究佛子岭连拱坝的变形性态

针对佛子岭连拱坝的结构特点 ,用三维薄层单元非线性有限元分析研究了典型坝垛的应力分布及坝顶位移变形规律 ,从而进一步掌握了佛子岭连拱坝的变形性态特性 ,亦解释了该坝 1 993年变形“异常”的物理成因机理     

岩土工程安全监测异常值属性的识别方法

针对施工期间岩土工程安全监测系统具有不完善、干扰和影响因素多、人工监测比重大等特点，介绍了监测数据可靠性检查和异常值监测方法，在将异常值分为假异常、表观异常和征兆异常后，结合工程实践阐述了异常值属性的识别原则和方法，并以实例分析了常见的导致假异常和表观异常的原因。这些分析方法是监测数据处理系统的必要组成部分。     

THE ANALYSIS OF THE SEPARATED LAYERS ALGORITHM BY DOMAIN DECOMPOSITION METHOD

From the principle of of the Domain Decomposition Method (DDM), we analyse the 2nd-order linear elliptic partial differential problems and link the Separated-Layers Algorithm (SLA) with DDM. The mathematical properties of SLA and numerical example are presented to obtain satisfactory computation results. For general linear differential ones, also are the structure of SLA and its characteristics discussed.     

空腹重力坝坝踵应力的有限元分析

空腹重力坝的结构比较复杂，用材料力学方法难以求出现踵的真实应力，采取弹性理论的有限元法来分析坝踵应力，对影响坝踵应力的多种因素进行了分析，以便为坝踵应力取值提供设计依据。     

TIME DOMAIN SOLUTION OF UNSTEADY FLOW AROUND A SHIP

The unsteady flow around a ship advancing at constant speed is studied in time domain using a higher-order boundary element method. The Rankine source is employed and the ship hull and free surface are discretized into 8-node isoparametric elements. A modified Green formula is used to overcome the numerical difficulty arising from the singular or quasi-singular integrals in the integral equation. In the case of τ> 0. 25, a rigid wall condition is applied to the upstream and a numerical beach is applied downstream to absorb the outgoing waves. The numerical results are satisfactory, compared with the experimental results.     

SIMULATION OF TANK SLOSHING BASED ON OPENFOAM AND COUPLING WITH SHIP MOTIONS IN TIME DOMAIN

Tank sloshing in ship cargo is excited by ship motions, which induces impact load on tank wall and then affects the ship motion. Wave forces acting on ship hull and the retardation function are solved by using three-dimensional frequency domain theory and an impulse response function method based on the potential flow theory, and global ship motion is examined coupling with nonlinear tank sloshing which is simulated by viscous flow theory. Based on the open source Computational Fluid Dynamics (CFD) development platform Open Field Operation and Manipulation (OpenFOAM), numerical calculation of ship motion coupled with tank sloshing is achieved and the corresponding numerical simulation and validation are carried out. With this method, the interactions of wave, ship body and tank sloshing are completely taken into consideration. This method has quite high efficiency for it takes advantage of potential flow theory for outer flow field and viscous flow theory for inside tank sloshing respectively. The numerical and experimental results of the ship motion agree well with each other.