气动旋扣钳主件动刚度研究

Study on Dynamic Stiffness of Main Parts of Pneumatic Rotary Clamps

动刚度是指结构在特定的动态激扰下抵抗变形的能力。旋扣钳作为石油钻井平台井口关键设备之一,研究其动刚度,以提高其动力学性能。对气动旋扣钳的主件进行了动刚度研究,通过锤击法来测量气动旋扣钳主件的结构动刚度,得到了气动旋扣钳主件的动刚度曲线。由动刚度曲线得到的前四阶固有频率,与用有限元法模拟计算的前四阶固有频率吻合,误差小于10%。分析动刚度曲线,表明动刚度随频率的变化而变化,激振频率等于固有频率时动刚度最小。研究成果为进一步提高气动旋扣钳的动力学性能提供理论依据。

The dynamic stiffness refers to the ability of a structure resisting deformation under specific dynamic disturbances.As one of the key equipment of the oil well drilling platform,the rotary clamp is studied to improve its dynamic stiffness.The structur⁃al dynamic stiffness of the main component of the pneumatic rotary clamp is measured by the hammering method,and its dynam⁃ic stiffness curve is obtained.The first four natural frequency obtained from the dynamic stiffness curve agrees with the first four natural frequency calculated by the finite element method,and the error is less than 10%.The dynamic stiffness curve is ana⁃lyzed,which shows that the dynamic stiffness changes with frequency,and the dynamic stiffness is the smallest when the excita⁃tion frequency equals the natural frequency.The research results provide a theoretical basis for further improving the dynamic per⁃formance of pneumatic rotary clamps.