| TBM is a typical major equipment in the field of tunnel constrmction.Its technology is great difficult and the added value is high.It also reflects the level of our country's equipment manufacturing industry.The cutterhead driving system is the connection of the dynamic and statics of in TBM system,which has two functions:support and drive.The "three high"surrounding rock environment,which are high hardness,high temperature and high quartz content,would make the force behavior of the cutterhead complex.Severe vibration would be caused by the complicated force behavior in TBM cutterhead driving system,which can lead to damage of transmission parts and other engineering faults.The complex structural characteristics of TBM cutterhead driving system,such as multi point meshing,multi stage transmission and multi binding surface,have brought a challenge to the study of the dynamic characteristics of the system under complex excitation.In this paper,the open-type TBM cutterhead driving system is taken as the research object.A hierarchical dynamic modeling and analysis method for the complex structure of TBM cutterhead driving system is proposed.The mechanism of coupling vibration of the system under strong impact excitation is studied.The influence of the system parameters on dynamic characteristics is revealed,and the theoretical model is verified by the vibration test of driving field and model test stand.The main research work is as follows:1)In view of the complex structure characteristics of the TBM cutterhead driving system,a hierarchical modeling method for the dynamic model of the complex gear transmission system is proposed based on the generalized finite element modeling idea.Considering the strong coupling relationship between the driving unit parameters and the motion and force parameters of TBM cutterhead driving system,virtual axis equivalent method based on the dynamic similarity theory is adopted.On this basis,the whole machine dynamic model of cutterhead driving system is established,which contains many nonlinear factors such as multi source drive,main reducer multistage planetary gear train and binding site of all structural parts unit.2)The natural frequency and vibration mode characteristics of TBM cutterhead driving system are studied in this paper.The system mode is divided into three types:axial mode,torsional mode and transverse vibration mode.The modal veering points of-the natural frequency with the parameter variation are obtained,and the pinions are suggested to be distributed as central symmetry.Considering the speed and torque characteristics of multi-source inverter motor under master-slave control,study on the time frequency response and dynamic meshing force characteristics under the motor stall,steady state load and impact load.The influences of the cutterhead load,the distribution mode of pinion and the speed of the cutterhead on the vibration response characteristics are revealed.Vibration responses under the action of simulated load are estimated and verified by comparing with the data measured on the driving place,where the error is about I8%?50%.3)With the natural frequency,vibration response of the key nodes and the dynamic meshing force for the system dynamic characteristic evaluation index,considering the change of input parameters such as external loads,material parameters,meshing parameters and coupling parameters,the global parameter sensitivity of system dynamic characteristics is analyzed based on the technology of surrogate model.Finally,variation of dynamic characteristics considering the interaction of polytypic parameters are obtained.4)A model test stand of the cutterhead driving system is designed and built.The results of theoretical analysis,such as meshing frequencies and their multiple are the main vibration frequencies of TBM cutterhead driving system and its coupling dynamic characteristics are verified finally. |
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