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本文用ANSYS软件的有限元分析功能,对轮式作业机井架结构简化的三维空间梁结构进行模态分析、瞬时动态分析和谐波响应分析。系统的结构模态是振动系统特征的一种表征,轮式作业机井架的模态分析所得出的固有频率、振型是井架承受动态荷载的重要特征。根据固有频率和振型可以预测井架在各种振源作用下的实际振动响应和在瞬时动力作用下产生的薄弱环节。文章通过分析井架在自重情况下的前6阶自由振动频率和振型、井架在钩载为1100kN作用下产生位移-时间图及转盘激扰时的振动位移,可以得出以下结论:井架以整体弯曲为主,四根立柱为主要承载构件,且前两根的立柱的承载能力最为薄弱。建议通过改变截面大小和材料来提高结构的稳定性和承载能力,通过优化截面参数提高结构的刚度。
In this paper, the finite element analysis of ANSYS software is used to analyze the modal analysis, transient dynamic analysis and harmonic response of a simplified three-dimensional beam structure of a derrick. The structural mode of the system is a characterization of vibration system characteristics. The natural frequencies and vibration modes obtained from the modal analysis of the derrick are important characteristics of the derrick under dynamic load. Based on the natural frequency and mode shape, the actual vibration response of derrick under various vibration sources and the weak links caused by instantaneous dynamic force can be predicted. By analyzing the first six free vibration frequencies and modes of derrick under dead weight, the displacement-time diagram of derrick under the hook load of 1100 kN and the vibration displacement when the turntable is disturbed can be concluded as follows: Bending mainly four columns as the main bearing member, and the first two columns of the carrying capacity of the weakest. It is suggested that the structural stability and load carrying capacity should be improved by changing the section size and material, and the stiffness of the structure can be improved by optimizing the section parameters.