【作者】 张敏；

【导师】 孔凡凯；

【作者基本信息】 哈尔滨工程大学 ， 机械制造及其自动化， 2012， 硕士

【摘要】 本文采用计算机建模与仿真的方法讨论了200kW潮流发电水轮机的外部载荷计算、有限元建模和动力学特性分析三个方面的内容。在外部载荷计算方面，根据实际测量的潮流流速，采用五次多项式拟合得到潮流流速随时间的变化函数。运用流体动量定理计算作用于潮流发电水轮机外部载荷随时间变化的函数，包括叶轮转矩和推力随时间变化的函数。采用傅立叶级数分解对所求函数进行变换，使其成为周期变化的简谐激励。在建模方面，主要利用Pro/E软件建立了叶片、轮毂、主轴、增速器和简化后潮流发电水轮的三维模型。利用简化后的潮流发电水轮机三维模型得到.igs格式文件，然后导入ANSYS软件作为几何模型，最后对其进行网格划分，接触定义和约束载荷施加，建立潮流发电水轮机的有限元模型。在动力学特性分析方面，主要进行了潮流发电水轮机传动系统及其相关零部件的模态分析和谐响应分析。通过对重要零部件的模态分析，得到叶片和增速器的前十阶固有频率，并将其与外部激振频率相比较，判断是否发生共振；提取潮流发电水轮机前十阶模态，将其固有频率与外部激励对比分析，判断是否发生共振。通过分析在外部载荷激励、叶轮偏心激励和发电机转子偏心激励作用下潮流发电水轮机的动态响应，验证结构设计的合理性。更多还原

【Abstract】 This paper discussed the200kW tidal current turbine including external loadscalculation, finite element analysis modeling and dynamic characteristic analysis of threeaspects based on computer modeling and simulation methods.In the external loads calculation, according to the actual measured velocity of the tide, itused five polynomial fitted the tide velocity with time. Proposed fluid momentum theoremobtained the tide of the external loads function with time acted on the tidal current turbine,including the impeller torque and thrust functions with time. Fourier series decompositionwas applied to transform the demand function into a cycle of harmonic excitation.In the modeling aspect, mainly using the Pro/E software fulfilled the three-dimensionalmodel, including the blade, hub, shaft and the simplified tidal current turbine. Utilized thesimplified three-dimensional model of turbine generate IGS file, and then as a geometricmodel import into ANSYS software, finally mesh, define contact and add constraints andloads, to establish finite element mode of tidal current turbine.In dynamic characteristic analysis aspect, mainly analyzed tidal current turbine and itsassociated parts’ modal and harmonious response. Through the important parts of the modalanalysis, obtained the top ten natural frequencies of the increaser and blade, and comparedthem with the external excitation frequency to estimate whether resonance occurred; extractedthe top ten order mode of tide power turbine, compared its natural frequency with the externalexcitation to estimate whether resonance occurred. Analyzed the tide power turbine dynamicresponse together with the incentives in the external loads, impeller and rotor eccentricincentives, verify whether the structural design is reasonable.更多还原