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轴流式转子轮毂关键部位的有限元分析

The Finite Element Analysis of Wheel Hub Essential Spot of Axial-Fiow Rotor

作者: 专业:机械设计及理论 导师:张永建 年度:2010 学位:硕士  院校: 山东科技大学

Keywords

Pro/Engineer, ANSYS, Hub, Finite Element Method, Statical Analysis, Modal Analysis

        我国对于通风机的研制和在工业部门广泛应用已有几十年历史了,目前通风机被广泛应用于煤矿的通风,被形象的称为“矿井的肺腑”。通风机的安全性和可靠性直接关系到工人的生命安全和矿井的正常生产。近年来矿用主通风机在运行时仍然发生了大量的轮毂和轮盘开裂等事故,引起风机领域的广泛关注。本文针对某煤矿一台矿用主通风机,利用三维建模软件Pro/Engineer构建分析模型,利用有限元分析软件ANSYS对其进行有限元分析和模态分析,从而确立转子中各部分的应力分布和振动特性,在保证结构强度、刚度的前提下提出优化转子结构,降低材料用量的方案。首先,根据本次研究被提供的条件,通过测绘、查阅手册得到分析对象的尺寸参数;取整个叶轮结构的1/16,利用Pro/Engineer的强大建模功能,分别对叶轮结构中每个零件建模。利用Pro/Engineer的装配功能,将零件装配成叶轮单元整体,实现快速而精确的建立叶轮曲面模型;然后将叶轮模型作必要的简化,利用Pro/Engineer和ANSYS的模型数据转换功能将模型导入ANSYS。其次,在有限元分析软件ANSYS中,通过定义单元类型、划分网格、加载以及求解,得到有限元静力分析的结果。通过查看轮毂受力云图和变形云图,从而得出轮毂危险部位之所在,对危险截面和结构冗余部位进行改进设计,达到节省材料和保证结构强度的双重目的,实现轮毂的安全性、经济性、合理性设计。最后,对叶轮进行模态分析,得到轮毂的振型变形图。通过轮毂的振型变形图,得到轮毂的振动频率和变形情况,为避免轮毂的自振频率与叶轮转动频率的整数倍重合提供理论依据。综上所述,本课题研究的目的是希望寻找一种研究叶轮结构特性的新方法,为以后的通风机转子设计与研究提供一种新途径和参考。
    It is several dozens years history for our country about fan’s study and widespread application in the Industry sector, at present the fan is widely applied in coal mine ventilation, it is image named "the lung of mine". The security and reliable of fan relateses workers’safety and regular production of mine directly. In recent years, mineral main fan still had had massive accidents on wheel hubs and wheel disk dehiscence and so on when works arouses the widespread interest of fan-domain. This article in view of a mineral main fan of a coal-mine, constructing anatomic model using Pro/Engineer which is a three dimensional modelling software, carries on the finite element analysis and the modal analysis using ANSYS which is finite element analysis software to it, thus establishes various parts of stress distribution resonance and oscillation dynamic characteristic in the rotor, proposed the plan that optimizing rotor structure and reducing the material amount under the premise guarantees the structure rigidity and intensity.Firstly, according to the condition which this research provides, we obtain the analysis size parameter of object through the surveying and consulting handbook, takes 1/16 of the entire impeller structure. Then using the formidable modelling function of Pro/Engineer, Modelling to each components in the impeller structure, useing the assembly function of Pro/Engineer to assemble the component of impeller to be a unit, realizing that the establishment of impeller-model fast and precisely. Then, we make the impeller-model the essential simplification, inputing the model to ANSYS with the data conversion function between Pro/Engineer and ANSYS.Next, in ANSYS, we can get statical analysis result by the way of definiting unit type, divising grid, loading as well as soluting. We can obtain dangerous spot of hub through examinatiing stress-cloud-chart and distortion-cloud-chart of hub, carries on the improving design to the dangerous section and the redundant structure spot, achieves double objects both saving the material and guaranteeing structural strength, realizes safe, economy, reasonable design of hub. Finally, carring on the modal analysis to the impeller, we obtain mode of vibration distortion chart of hub and vibrational frequency and the distortion situation through the vibration-distortion chart of hub. It provides the theory basis in order to avoid base-frequency of hub and the impeller rotational-frequency integral multiple superposition.In summary, the goal of this topic is seeking for one new method of research impeller structural property,it provides one new way and a reference for ventilator rotor design and the research later.
        

轴流式转子轮毂关键部位的有限元分析

摘要5-6
ABSTRACT6-7
1 绪论12-18
    1.1 选题背景及意义12-13
    1.2 国内外研究现状和发展趋势13-16
    1.3 本课题研究的目的及意义16-18
2 建立分析的数学模型18-22
    2.1 气流对叶片的作用力18-20
    2.2 叶轮自重而引起的惯性载荷20-21
    2.3 本章小结21-22
3 建立叶轮模型22-34
    3.1 Pro/Engimeer三维建模软件的发展22-23
    3.2 Pro/Engincer的主要特性及功能23-25
    3.3 利用PRO/E构建叶轮模型25-31
    3.4 将模型导入ANSYS系统31-33
    3.5 本章小结33-34
4 有限元静力分析34-53
    4.1 CAE技术及其发展34-36
    4.2 ANSYS软件及其应用36-39
    4.3 ANSYS分析前处理39-41
    4.4 施加载荷并求解41-45
    4.5 对简化后的叶轮进行有限元分析45-48
    4.6 有限元分析结果分析48-51
    4.7 轮毅改进设计51-52
    4.8 本章小结52-53
5 轮毅的动力学分析53-68
    5.1 模态分析简介53-54
    5.2 轮毅的模态分析过程54-67
    5.3 本章小结67-68
6 结论与展望68-70
    6.1 本文结论68-69
    6.2 未来研究工作展望69-70
致谢70-71
参考文献71-74
攻读硕士期间从事的科学研究及发表的论文74
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