Analysis And Improved Design Of The Power Drive System Of Open-type Hard Rock Tunnel Boring Machine

Tunnel boring machine,short for TBM,is a collection of mechanical,hydraulic,measuring,control,and other multi-disciplinary technology,dedicated to the underground tunnel engineering construction equipment.With the development of society and traffic network,many countries pay much attention to the underground construction.In addition,national defense construction,large-scale water conveyance project,and urban drainage system is inseparable from the construction of the tunnel.It is important to adopt TBM with the advantage of high efficiency and safety in underground project.The main work is listed as follows:In chapter 1,this paper introduced the mechanical structure and development of TBM,the general situation and technology development of the driving system of TBM in the worldwide are also listed,as well as the shortages,and the study meaning and main work of this paper were put forward.In chapter 2,the basis of summarizing the existing research results and load characteristics in practical constructions,to solve the problem of mismatch of parameters,thrust force and torque calculation models of the thrust system and cutter head drive system were put forward based on the CSM model.Compared with the traditional formula,many factors in rock environment such as rock type and penetration have been taken into account.The relationship between propulsion and penetration was described,as well as torque.It was shown in the practical examples in Jilin water project,ABH water project and Baolin tunnel construction that the calculated and measured loads were much close,thus the model can be used for calculation of propulsion and torque of TBM power drive system.In chapter 3,to solve the condition of sharing load of motors,the paper proposed a speed-torque synchronous control for motors.The vector control model of synchronization 3-phase motor is established based on the orientation of rotor flux and coordinate transformation.Torque master-slave synchronization control and speed parallel control of cutter head multiple electric motor driving system are comparatively studied.In Chapter 4,the calculation method of propulsion and support force was put forward,the power system and attitude hydraulic system were also developed.In AMEsim software platform,load sensitive control and displacement synchronization of thrust cylinders against unbalance load are simulated and corresponding pressure or fluent control method are discussed separately,ground bearing pressure control based on the pump pressure cut-off of gripper cylinder are studied.Multi-cylinder synchronization control are proposed for the torque cylinder of attitude hydraulic system against inverse load with balance valve pair,the error of the attitude adjustment can be controlled under 1% of the target displacement.By comparing the simulation results and measured data,it was verified that such control methods is feasible,which provides theoretical basis for the design of the power system.In chapter 5,the conclusion is given and an expectation on the future work about this study is put forward.