“П”型井架背部杆联接刚度对其动力特性的影响

Effect of Joint Stiffness of Back Web Members on the Dynamic Characteristics of "П" Type Oil-Drilling Mast

以一个实际井架 (ZJ2 0 )作为算例 ,探讨了背部腹杆联接刚度对“П”型井架系统动力特性的影响 ,研究了背部腹杆节点在空间铰、柱形铰和刚性三种理想联接方式下井架系统的动力特性 ,给出了前 6阶模态和自振频率。揭示出当背部杆节点在空间铰与刚性联接两种极端情况之间变化时 ,井架系统前 6阶自振频率可发生 2 7%～

The effect of the joint stiffness of back web members on the dynamic characteristics of the mast system for oil drilling is investigated by analyzing a real mast of the type ZJ20. The dynamic characteristics of the mast system with three types of joints, i.e.,pin joints, cardan joints and fixed ends, of the back web members are investigated, and the first six modes and natural frequencies are given. It has brought to light that as the joint stiffness is changed between the extremes, the first six modes and the natural frequencies can have deviations of 27%～48% off their average .