Nonlinear Static and Dynamic Stiffness Characteristics of Support Hydraulic System of TBM

Abstract

Full-face hard rock tunnel boring machines (TBM) are essential equipment in highway and railway tunnel engineering construction. During the tunneling process, TBM have serious vibrations, which can damage some of its key components. The support system,an important part of TBM, is one path through which vibrational energy from the cutter head is transmitted. To reduce the vibration of support systems of TBM during the excavation process, based on the structural features of the support hydraulic system, a nonlinear dynamical model of support hydraulic systems of TBM is established. The influences of the component structure parameters and operating conditions parameters on the stiffness characteristics of the support hydraulic system are analyzed. The analysis results indicate that the static stiffness of the support hydraulic system consists of an increase stage, stable stage and decrease stage. The static stiffness value increases with an increase in the clearances. The pre-compression length of the spring in the relief valve affects the range of the stable stage of the static stiffness, and it does not affect the static stiffness value. The dynamic stiffness of the support hydraulic system consists of a U-shape and reverse U-shape. The bottom value of the U-shape increases with the amplitude and frequency of the external force acting on the cylinder body, however, the top value of the reverse U-shape remains constant. This study instructs how to design the support hydraulic system of TBM.

Study on the effect of dynamic stiffness of supporting structure on dynamic characteristics of the rotor system

“…The frequency response of the support is obtained by finite element analysis software. The corresponding dynamic stiffness of the support is calculated by MATLAB according to equation (4). Then the global parameter matrices K, M, C, G, and Q are established, and the global stiffness matrix integrates the dynamic stiffness of the support, which varies with the rotating speed.…”

“…Kim et al 3 calculated the dynamic stiffness of a five-axis multi-task machine tool in three directions, and the dynamic stiffness experiments were carried out with an exciter to verify the correctness of the results. Tao et al 4 analyzed the influence of component structural parameters and operating conditions on the stiffness characteristics of the roadheader hydraulic support system, finding that its dynamic stiffness characteristics were U-shaped and reverse U-shaped over time. However, the above study on dynamic stiffness has nothing to do with rotor systems.…”

Development of High-Speed On–Off Valves and Their Applications

“…Hydraulic technology which generates, transmits, and controls the power with pressurized liquids has advantages of high power density, large output force and easy linear motion [1]. It plays an irreplaceable role in many fields, such as construction machinery, machine tool industry, mining engineering, and so on [2][3][4]. With the widespread application of the computer and microelectronic technology in the industry, digitization which is essential to the intelligent control becomes the inevitable developing trend of the hydraulic technology.…”

Research on a ø6m TBM Steel Arch Splicing Manipulator

“…Generally known as a large-scale equipment, Hard Rock Tunnel Boring Machine (TBM) is specially applied to conduct the tunnel excavation inside hard rock [1][2][3][4].With the functions of excavating, slagging and supporting, TBM is also widely adopted in the field of hard rock excavation [5][6][7]. The construction of TBM would unavoidably destroy the initial in-situ stress state of the surrounding rock in the original stratum, resulting in redistribution of stress in the surrounding rock which would lead to the deformation, destruction or even collapse of the surrounding rock [8,9].…”