HXJ158C型海洋修井机有限元计算与分析
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摘要
结合海洋修井机的工程设计实例,利用ANSYS软件模拟计算,对其实际结构进行简化,采用整体建模分析的方法建立整机直立工作状态和井架起升状态的有限元模型,通过静力分析和模态分析,得出前10阶固有频率都在12 Hz以内,井架的振动幅度大于钻台底座。绞车主滚筒转速0~415 r/min,相应扰动频率0~7 Hz;转盘驱动最高转速221 r/min,其扰动频率在4 Hz以内。因此,由绞车带来的扰动激励容易激发井架前6阶共振,而转盘驱动的扰动激励容易激发底座的横向左右摆动。该项研究成果可为修井机设计和使用提供参考依据。
Referring to the practical engineering design example of offshore workover rig,applying the ANSYS software to conduct the simulation calculation and simplifying the real rig structure,the finite element model of the whole rig'upright operating condition and the derrick's lifting condition was established adopting the overall modeling analysis method.The slenderness ratio was judged and it was found that the natural frequency of the first ten orders falls within 12 Hz and the vibrating amplitude of the derrick is greater than that of the drill floor base.The rotation speed of drawworks is between 0 and 415 r/min;the corresponding disturbance frequency is between 0 and 7 Hz;the maximum rotary table-driven rotation speed is 221 r/min;its disturbance frequency falls within 4 Hz.Therefore,the disturbance excitation caused by the drawworks will easily excite the resonance of the derrick's first six orders.The disturbance excitation caused by rotary table driving will easily excite the base's lateral movement.In light of this condition,the resonance should be avoided in order to make the frequency of drawworks and rotary table go far away from the resonance zone frequency.The present study can offer the basis for the design and use of workover rig.
引文
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