Dynamic Characteristics Analysis of Cutterhead System with Uncertain Loads

Abstract

Tunnel boring machine (TBM) is a large and complex tunnel tunnelling equipment, which is widely used in underground works such as water conservancy, transportation, national defense and energy. In the construction of TBM, it is very difficult to predict the dynamic characteristics of the cutterhead system, because of its complexity and the uncertainty of the service environment, geological uncertainties and manufacturing process. To solve the above problems, first of all, this paper applies concentrated mass method, establishing a multi degree of freedom coupling dynamic model of TBM cutterhead system under uncertain excitation. Considering the changes between hob location and establishing the uncertain geological condition model, the load boundary with uncertainties is obtained and replaced by the load boundary. The dynamic characteristics of TBM cutter head system with uncertain load are obtained, which provides important basis for TBM vibration reduction and optimization design.