Response And Optimization Of The Heavy Block Of The Mechanically Stabilized Platform In A Vibrating Environment

Mechanical automatic vertical drilling tools have the advantages of high temperature resistance,low cost,and wide application range.They have shown good application prospects in deep resource exploration applications,but the pure mechanical structure leads to relatively low correction accuracy.In order to further improve the correction accuracy of mechanical automatic vertical drilling tools,this paper studies the control performance of the mechanical automatic vertical drilling tool control mechanism(stabilized platform)in a vibrating environment.Based on the structure and working principle of the ?114mm dynamic push-back mechanical automatic vertical drilling tool stabilization platform developed by the scientific research team of the Key Laboratory of Deep Geological Drilling Technology of China University of Geosciences(Beijing),a simulation model of the mechanical stabilization platform is established in the software Adams;and A mathematical analysis model for the performance of the mechanical stabilized platform was created,and the factors affecting the performance of the stabilized platform were summarized through the mathematical model.Using the stabilized platform model,the control performance of the mechanical stabilized platform under vibration-free,stick-slip vibration and lateral vibration is studied respectively;and two performance evaluation indicators are used: control accuracy(critical included angle)and control efficiency(stabilization time)Analyze the simulation results;obtain the influence rules of various factors on the performance of stable platform under non-vibration,stick-slip vibration and lateral vibration.Finally,it is concluded that the factors that have a greater impact on the performance of the stable platform,and when the performance of the stable platform is optimal,the optimization direction and recommended values of each influencing factor.The analysis results show that the radius of the biased block and the radius of the PDC composite sheet have a greater impact on the control accuracy of the mechanical stabilized platform;and the length of the biased block and the density of the biased block increase,and the control accuracy will increase accordingly.The radius of the PDC composite sheet and the coefficient of dynamic friction between the PDC composite sheets have a relatively large influence on the control efficiency;and as the coefficient of dynamic friction between the PDC composite sheets increases,the control efficiency decreases.Finally,the optimization direction and recommended value range of the influencing factors of the mechanical stabilization platform under different optimization requirements are summarized,which provides a reference for the optimization design of mechanical automatic vertical drilling tools.