摘要
随着科学技术的不断发展,风力发电技术在世界上得到了飞快的发展,越来越多的兆瓦级大型风力发电机组相继建成并投入运行,风电市场前景异常广阔。膜片联轴器是风力发电机组中的重要部件,而金属膜片是膜片联轴器的关键部件,通过它来传递转矩和运动,其设计的好坏将直接影响到整个机组的正常运行和使用寿命,因此有必要在设计阶段对膜片联轴器进行振动分析和疲劳计算,为联轴器的可靠性设计提供依据。本文课题研究就是在这样的背景下,应某企业的需求,对风力发电机组的膜片联轴器进行振动分析和疲劳计算。
本文主要进行了以下研究:
①基于多体动力学理论,利用虚拟仿真软件ADAMS建立了膜片联轴器多刚体虚拟样机。同时在多刚体模型的基础上对膜片进行柔性化处理,建立联轴器的刚柔耦合模型,得到了膜片的动力学响应。
②根据刚柔耦合分析得到的膜片应力—时间历程,结合疲劳分析软件FATIGUE进行膜片的疲劳分析,得到了膜片的疲劳损伤图以及疲劳寿命。
③基于振动理论,结合有限元分析软件PATRAN/NASTRAN,建立了膜片联轴器整机的有限元模型,通过模态分析,求出联轴器前10阶振型与固有频率,进而计算出联轴器的前五阶临界转速,将其工作转速与之进行了比较,验证是否会发生共振。
因此,本论文对膜片联轴器的分析和自主设计提供科学可靠的依据,对企业解决联轴器振动和寿命的问题具有重要的理论意义和工程实用价值,对企业在设计过程中减少设计缺陷,缩短开发周期,降低生产成本,快速响应用户的需求和市场的变化,提高企业的竞争力,具有重要的理论意义和实用价值。
Wind energy technology has developed rapidly with the science and technology uninterrupted growth. In all over the world, more and more large wind turbine generators have established consecutively and brought into service. The prospect of wind energy marketplace becomes vast extraordinarily. Diaphragm coupler is the important parts of the wind turbine, diaphragm is the key components of the diaphragm coupler, through which to transfer torque and exercise, and its design will affect to the normal operation and service life. So it is necessary to make vibration and fatigue analysis in the design stage for reliability. Under this background, the project is to carry out fatigue and vibration analysis to the crucial elements of diaphragm coupler, which responds to the need of some enterprise.
The main contents are following:
①This paper bases on the dynamics theories and utilizes software platform of ADAMS to establish multi-rigid body system. Then, on the use of finite element software PATRAN, establish modal neutral document of diaphragm, and add it into the ADAMS to get the rigid-flexible coupling body.
②According to the stress-time history results, utilizes the FATIGUE to make fatigue analysis, and obtain the life in repeats of diaphragm.
③Based on the vibration theory, combined with finite element analysis software PATRAN/NASTRAN, establish the finite element model of diaphragm coupler. Using the modal analysis to obtain the first 10 bands natural frequency of vibration. Then calculate the 10 bands critical speed, compared it with the work speed to verify whether there will be any resonance.
According to the above, it provides scientific and credible basis to the analysis and self design on the diaphragm coupler, and great theoretical significance and project application to enterprises to solve safety and life problem. In addition, it settles grounded basis for improving technical level of wind generator equipment, reducing cost of wind generation, promoting market competition capacity and implementing domestic wind generator with independent intellectual property rights.
引文
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