基于热分析的风力发电机齿轮裂纹研究

发布时间：2018-04-12 12:26

本文选题：风力发电机 + 齿轮裂纹　；参考：《沈阳工业大学》2017年硕士论文

【摘要】：增速齿轮传动系统是风力发电机的核心部件,齿轮箱故障会导致整个风机停机。齿轮传动系统故障中齿轮类故障占主要部分,局部故障又是引发齿轮类故障的最重要原因之一,包括裂纹、崩齿等,而裂纹又是其中最难识别、最易发生的类型。因此,为了防止因齿轮裂纹引起轮齿折断造成的生产事故,有必要对齿轮裂纹的相关特性进行研究。本文以1.5MW风力发电机高速级渐开线直齿轮副为研究对象,由于高速级齿轮运转速度快,载荷较大,温度对齿轮的影响具有重大研究意义,本文基于热分析对齿轮裂纹力学特性进行研究,主要内容如下:基于ANSYS有限元分析软件环境下,分别建立无裂纹渐开线直齿轮副和含裂纹渐开线直齿轮副三维模型。在静力学分析基础上对二者进行冷态分析,研究其接触特性和时变啮合刚度。比较二者的分析结果,分析裂纹对齿轮的影响,通过改变裂纹的基本参数,更进一步得出裂纹对齿轮特性影响的相关规律。考虑温度对齿轮裂纹的影响,基于热分析对热态齿轮裂纹静力学特性进行研究,观察其热行为规律,与冷态分析结果进行比较,接触应力应变和啮合刚度都会因热变形现象发生改变,结果显示热态齿轮裂纹对齿轮接触特性影响更加敏感,分析结果更加符合实际情况。在静力学分析基础上,采用集中参数法建立直齿轮动力学模型,考虑温度变化情况,将有限元法计算得到的热态齿轮时变啮合刚度导入到模型中,利用MATLAB软件对不同深度裂纹和不同工作情况下的齿轮动态响应进行编程求解,根据结果对基于热分析的齿轮裂纹动力学性能进行研究。通过对含裂纹的齿轮在正常工作环境下的相关特性进行的分析,为齿轮能够高速、平稳运转提供理论依据,对理解齿轮产生振动噪声的原因和齿轮故障诊断研究具有更深刻意义。
[Abstract]:The speed-increasing gear drive system is the core part of the wind turbine. The gearbox failure will cause the fan to stop.Gear fault is the main part of gear transmission system fault, and local fault is one of the most important causes of gear fault, including crack, tooth collapse and so on, and crack is the most difficult to identify, the most prone to occur type.Therefore, in order to prevent the production accident caused by gear crack, it is necessary to study the characteristics of gear crack.In this paper, the high speed involute spur gear pair of 1.5MW wind turbine is taken as the research object. Because of the high speed and load of the high speed grade gear, it is of great significance to study the influence of temperature on the gear.The main contents of this paper are as follows: based on ANSYS finite element analysis software, 3D models of cracked involute spur gear pair and cracked involute spur gear pair are established respectively.On the basis of statics analysis, the contact characteristics and time-varying meshing stiffness of the two are studied.By comparing the results of the two analysis, the influence of crack on gear is analyzed. By changing the basic parameters of crack, the correlation law of crack on gear characteristic is obtained.Considering the influence of temperature on gear crack, the static characteristics of hot gear crack were studied based on thermal analysis, and the thermal behavior of the crack was observed and compared with the results of cold analysis.Both contact stress strain and meshing stiffness will change due to thermal deformation. The results show that the hot gear crack is more sensitive to the contact characteristics of the gear and the analysis results are more in line with the actual situation.On the basis of static analysis, the dynamic model of spur gear is established by means of lumped parameter method. Considering the change of temperature, the time-varying meshing stiffness of hot gear calculated by finite element method is introduced into the model.The dynamic response of gears with different depth cracks and different working conditions was solved by MATLAB software, and the dynamic behavior of gear cracks based on thermal analysis was studied according to the results.By analyzing the related characteristics of cracked gears in normal working environment, the theoretical basis is provided for the gears to run at high speed and smoothly.It is of great significance to understand the causes of gear vibration and noise and the research of gear fault diagnosis.
【学位授予单位】：沈阳工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM315;TH132.41

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