Research On Coupling Dynamic Characteristics Of TBM Cutterhead System Under Multi-source Uncertainties

TBM(tunnel boring machine)is an integrated large-scale tunnel boring complex equipment,which has been widely used in water conservancy,railway and other fields.As a kind of machine in extreme environment,the complex and changeable driving environment of TBM also causes the strong vibration damage of the key parts of TBM.As the most important part of TBM,the failure of the cutterhead system often seriously affects the driving efficiency,so it is necessary to analyze and study the vibration of the cutterhead system.There are many uncertainties in the cutterhead system,such as the uncertainty of assembly and the uncertainty of geology.These uncertainties are often coupled with each other,which increases the difficulty of vibration analysis of the cutterhead system,causes the inaccuracy of vibration analysis and the difficulty of dynamic characteristic prediction,and then makes the vibration reduction optimization design of the TBM cutterhead system go against expectations.Therefore,it is necessary to model and analyze the coupling relationship of multi-source uncertainties,and then establish a more practical dynamic model of cutterhead system,and carry out the corresponding dynamic analysis.The main work of this paper is as follows:1)The establishment of uncertainty model of TBM cutterhead system.Through the analysis of the uncertainty of the assembly of the hob,the location of the hob driving,and the uncertainty of the geology,the uncertain models of the hob assembly,the location of the hob driving,the geology are established.This provides the basis for the solution of the load interval of the cutterhead system.2)Dynamics modeling of cutterhead system under multi-source uncertain factors.The interval load of the system under the multi-source uncertainties is obtained by the interval transformation of the uncertain model,and the multi-degree-of-freedom coupling dynamic model of TBM cutterhead system under multi-source uncertainty is obtained by combining load interval with the established cutterhead system dynamics model,which provides the model basis for the dynamics research.3)Analysis of load variation rule of various degrees of freedom under various working conditions of cutterhead system under multi-source uncertainties.Through the combination of the established geological uncertainty model,the uncertain model of hob assembly,the uncertain model of hob position and the load calculation,the variation rule of the load in various degrees of freedom of the cutterhead under the multi-source uncertainty is analyzed,and on this basis,combined with the typical working conditions,the variation rule of various degrees of freedom under various working conditions of cutterhead system under multi-source uncertainties is obtained,which is the load input of the dynamic analysis of the cutterhead system under the multi-source uncertainty.4)Verification of uncertain dynamics solving method.In order to verify the effectiveness of the dynamic solution method of the cutter head system under multi-source uncertainties,the engineering measured data,simulation data and dynamic response boundary data under uncertainty are compared,and then the feasibility and effectiveness of the method in this paper are verified.5)Taking an engineering project as an example,the dynamic analysis of cutterhead system is carried out by using the research method in this paper.The influence rules of the cutterhead vibration response under different working conditions and different degrees of freedom of the cutterhead system under multi-source uncertain factors are studied.And they are compared with the vibration response boundary of the cutterhead without considering the uncertain factors,which not only illustrates the importance of the uncertain factors for dynamic analysis,but also provides a more effective theoretical reference for cutterhead structure and vibration reduction design.