格构式钢管混凝土风力发电塔架的有限元分析结构工程专业论文.docxVIP

内 内蒙古科技大学硕士学位论文 I I 摘 要 水平轴风力发电机塔架主要可分为锥筒式和桁架式两类。目前对锥筒式塔架的研究较 多，这种塔架安全性较好，但用钢量较大。桁架式塔架由格构肢柱联接而成，整体呈空间 网格状，由于风荷载直接穿透塔架，从而避免塔架在风荷载作用下和叶片发生共振，相对 于锥筒式塔架，受力方面有其独特优越性，因此有必要对桁架式塔架进行分析。 本文以格构式钢管混凝土风力发电塔架为研究对象，以有限元软件 ANSYS 作为分析 平台。首先根据格构式风力发电塔架的几何参数和受力特点，对塔架进行了初步设计； 其次，在静力分析部分，利用 ANSYS 分析塔架在不同风荷载工况下的变形与应力，找出 格构式钢管混凝土塔架的受力薄弱部位，得出在极限风速工况下，塔顶位移超过了限 制，需要采取风振控制措施；又对格构式钢管混凝土塔架进行模态分析，得出塔顶机头 质量和基础刚度与塔架一阶固有频率的关系曲线；最后，对格构式钢管混凝土塔架进行 稳定性分析，研究不同荷载组合下的塔架失稳破坏形式，从而确定塔架的临界荷载。 本文对格构式钢管混风力发电塔架的理论研究和有限元分析结果可以为塔架设计提 供一些参考和建议。 关键词：格构式钢管混凝土塔架、风力发电、模态分析、应力、固有频率、稳定性 II II Abstract The horizontal axis wind-driven generator can be divided into two kinds: one is cone tube tower, and the other is lattice wind turbine. At present, there are lots of studies about cone tube tower, this tower’s security and safety is better, but the total steel quantity is large. What’s more, under strong wind force, the cone tube tower is easy to generate wind vibration phenomenon. However, the lattice wind tower turbine has connected by limb columns, and its whole shape shows space grid, as a result, wind load can directly penetrate the tower, avoid wind loads tower vibration prone, given its force-undertaken superiority, it is necessary to analyze lattice wind tower turbine. In this thesis，the research object is lattice wind turbine of steel tube filled with concrete , by using the finite element software ANSYS as analysis platform. First, according to the geometric parameters and mechanical characteristics of lattice wind tower, made the preliminary design of tower. Second, Study the conduct modal of lattice wind tower, using ANSYS analysis the deformation and stress of tower under different load combination, find the force weak positions of this constitutive type. Under static wind loads situation, the tower can work safety, the control indicators, column top displacement, can be in allowed range. At the same time, the factors which influent the tower’s natural inherent frequency, and the tower wont occur resonance, mo