Sensitivity analysis of an open TBM gripping-thrusting-regripping mechanism based on the natural characteristics. (September 2019)

• Record Type: Journal Article
• Authors: Yang, Yuhu; Chen, Gang; Liu, Xianzeng; Huang, Tian; Yang, Jianming
• Is Part Of: Mechanism and machine theory. Volume 139(2019)
• Page Start: 1
• Page End: 20
• Publication Date: 2019-09
• Subjects: Tunnel boring machine -- Gripping-thrusting-regripping mechanism -- Elasto-dynamic model -- Natural characteristics -- Natural frequency sensitivity; Machine theory -- Periodicals; Machinery -- Periodicals; Machines -- Périodiques; Génie mécanique -- Périodiques; Machine theory; Machinery; Periodicals; 621.81
• DOI: 10.1016/j.mechmachtheory.2019.04.006
• Languages: English
• ISSNs: 0094-114X

Abstract

Highlights: The dynamic model of GTRM is presented by Lagrangian method. The model is validated through a FEM model developed in SAMCEF software. The lower order natural frequencies and relevant vibration modes are investigated. The frequency sensitivity to the influence factors is analyzed in detail. Abstract: The gripping-thrusting-regripping mechanism, as the core transmission components of the open TBMs, is always subjected to the strong and low frequency distributed impacts in tunneling operations, causing the severe vibration and unexpected damage of the key components. It is therefore crucial to gain deep insight into the basic vibration characteristics. With the consideration of the stiffness of the actuating hydraulic cylinders, coupling of the generalized coordinates and elasticity of main beam, etc., the dynamic model is established by Lagrangian method to analyze the lower order natural frequencies and relevant vibration modes, and it is validated by the finite element model developed in SAMCEF software. The effects of the stiffness, inertial and dimensional parameters on natural frequencies as well as their sensitivity are investigated in detail. The results indicate that the 1st mode shape is the rotation around z -axis of cutter-head, main beam and carrier, and the 2-4th mode shapes are the translations at y, x and z directions; the parameters of cutter-head support unit and propel cylinder are the main factors affecting the natural characteristics. These findings can provide some references to design the mechanical structure and to select the duty parameters in engineering applications.