Analysis And Optimization Of Dynamic Characteristics Of The Makeup And Breakout Device About LK500 Top Drive Drill System

The Makeup and Breakout Device(MBD)of Top Drive Drill system(TDS)is a typical electromechanical-hydraulic complex system,including mechanical,hydraulic components and controller.The controller controls the hydraulic actuators to drive the tilting device,the back tong and the IBOP to complete the operation of taking the drill pipe,connecting the root,preventing the mud spewing.It s outstanding advantage is to significantly improve the efficiency of drilling operations.Multidisciplinary Design Optimization(MDO)is a field of engineering which using optimization methods to solve design problems incorporating a number of disciplines.In the process of complex system design and analysis,the MDO adopts effective optimization strategy by integrating the modeling theory,analysis and calculation methods of different disciplines,so that the whole system can obtain the optimal solution.Dynamic characteristics analysis is an important index to evaluate system performance.The dynamic characteristics of complex systems include mechanical,hydraulic,and control aspects.In this paper,the dynamic characteristics analysis and optimization of MBD of LK500 type TDS are carried out in the following aspects:(1)The mathematical model of mechanical,hydraulic and control of the MBD tilting device was established,and the parallel hydraulic cylinder of the tilting device was controlled synchronously by using PID control method.The Multidisciplinary Feasible(MDF)and Collaborative Optimization applications(CO)were selected to establish the optimization framework,and three algorithms in genetic algorithm(GA)and two algorithms in Pareto algorithm(PE)were selected to calculate the mathematical model.According to the results,using the PE algorithm under the CO optimization framework is better.(2)An i SIGHT-based electromechanical-hydraulic complex system cosimulation optimization platform w as established.MDF and PE optimization algorithms were selected for optimization.According to the optimization results the PID control method can effectively increase the synchronization rate of the parallel hydraulic cylinders.By comparing with the calculation results of mathematical model,the overall quality of the system was decreased,the power of the hydraulic system was decreased and the control precision was improved while ensuring the strength and rigidity of the system.The simulation platform was optimized and set up reasonably.(3)The dynamic parameters of the mechanical system and the hy draulic system were analyzed according to the parameters of the optimized MBD.The load,pressure,and flow characteristics of the key components were obtai ned during the operation.According to the results,the MBD runs smoothly,verifying the rationality of the optimization program.PLC is used to write the hydraulic control program segment of the key components.In the end,the MBD with reliable performanc e is obtained.The methods and results of this paper can provide reference basis and technical support for the optimal design of the MBD.