Design Of Intelligent Vibration Control System For TBM Host

With the further advancement of domestic infrastructure construction,tunnel boring machine of full section(TBM)will play an increasingly significant part in urban subway,undersea tunnel and other engineering fields.TBM often encounters complex working conditions such as high hardness rocks and broken zones during the tunneling process.The host system vibrates violently,which causes rapid failure of key components.This seriously affects the safety and efficiency of tunnel construction.In response to the problems,this paper establishes the dynamic model of TBM host system that considers the external space multipoint random load,multi-source drive and system nonlinearity.The vibration characteristics of the key components and vibration transmission law of the system are obtained based on the dynamic model,and the design method for intelligent vibration control system of TBM host system is proposed.The main work details of this paper is as follows:(1)Taking TBM of a water diversion project as the research object of this paper,the dynamic model of the host system is established,and the calculation methods of internal parameters such as stiffness of main bearing,contact stiffness of shield and surrounding rock are given.According to the layout characteristics and force characteristics of the disc cutter,the equivalent load spectrum of the cutterhead is synthesized based on the test load,simulation load and measured load,which provides input for the dynamic model.(2)The internal parameters of the TBM dynamic model are calculated based on the structural parameters and the field tunnelling parameters.The field vibration sensing test system of TBM host system is built.The internal parameters are corrected by the multi-point measured vibration data,and the maximum error of the modified dynamic model is 30.89%.Based on the modified dynamic model,the vibration characteristics of the key components and the vibration transfer law of the system are analyzed.(3)The design of TMD-TBM anti-vibration scheme is completed.The dynamic model of the two-degree-of-freedom anti-vibration mechanism is built and the anti-vibration parameters are optimized.Based on the dynamic model,it was found that changing the damping parameters of the TMD system could improve the anti-vibration effect when frequency and amplitude of the external excitation change,and the maximum increase rate is 64.68%.Based on this characteristic,the anti-vibration scheme of MR-TMD-TBM is proposed.(4)The mechanical and electrical coupling model of MR-TMD-TBM system is established.The anti-vibration effect of key components is compared when the control system adopts different control algorithms,and the superiority of using the sky-hook control arithmetic is confirmed.Comparing the vibration response of the key components of the TBM system,TMDTBM system and MR-TMD-TBM system under typical working conditions,it is confirmed that the anti-vibration effect of the MR-TMD-TBM system is more significant,which can reduce the axial acceleration evaluation value of the cutterhead support assembly by up to 8.3% and the transverse overturning acceleration evaluation value by up to 58.6%.(5)The scale test bench of variable damping TMD anti-vibration mechanism is built,which provides the platform for the verification of anti-vibration scheme.The dynamic models of the scale test bench are built to compare the vibration response of key components,and determine the optimal vibration reduction parameters of the system under different working conditions to guide the selection of parts.Through the finite element analysis software,the strength and stiffness of the main bearing parts of the scale test bench are checked,and the stress and deformation are in the safe range.