The Dynamic Comparative Analysis between Two TBM Main System Structures

Junzhou Huo,Hanyang Wu,Jing Chen,Jingxiu Ling,Xiaolong Sun 보안공학연구지원센터 2015 International Journal of u- and e- Service, Scienc Vol.8 No.11

Excessive vibration and vibration damage are serious engineering problems in the TBM boring process. TBM dynamic characteristic analysis is essential to the anti-vibration design of the TBM mainsystem. This paper classifies the TBM thatmostly used in the practical engineering into TBM 1 and TBM 2, and comprehensively analyses the difference of cutter layout strategy, pinion layout strategy, shield support structure, etc between TBM 1 and TBM 2. A dynamic comparative analysis of TBM cutterhead was carried out based on a TBM dynamic model. The analysis results show that the cutterhead horizontal vibration of TBM 1 is around 0.3mm while that of TBM 2 is around 1.4mm.The vibration periodicity of TBM 2 significantly reduces. The influence of shield vertical support on the horizontal and vertical vibration of TBM 2 is analyzed. The results show that settinga vertical support at the bottom of the shield reduces the TBM cutterhead vibration by about 12%.

Anti-vibration design for TBM main drive system based on multi-directional coupling dynamic characteristics analysis

Junzhou Huo,Hanyang Wu,Wenbo Ji 대한기계학회 2020 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.34 No.11

Extreme vibration often occurs on TBM main system during the tunneling process. This paper established the mathematical model for TBM main system considering the impact load, time-varying internal incentive and the complex coupling relationship between each vibration degree of freedom. The dynamic model was modified by the multi-point vibration measured data. The calculation error of the system response of the main support frame’s main vibration direction was within 10 %. And it was found that the overturning vibration and axial vibration of the system were the main forms of vibration of the system. It was determined that the low-frequency vibration of 15-20 Hz was a coupled vibration of system’s first to fourth mode vibration mode. Based on the vibration characteristics of TBM main system, this paper designed a tuned mass vibration absorption structure (TMVAS) that can adapt to the multi degree of freedom (MDOF) coupling vibration of TBM main system during the actual tunneling process. To minimize system vibration, the optimal design parameters of the system was determined. The maximum amplitude of the axial and horizontal overturning vibration of the support frame was reduced by 26.7 % and 13 %, and the maximum amplitude of the cutterhead’s axial vibration was reduced by 23.2 %.

Comparative Analysis of Newmark and Rungekutta Method for Solving A TBM Cutterhead Multi-DOF Dynamic Model

Junzhou Huo,Hanyang Wu,Jing Chen,Jingxiu Ling,Guangqing Li 보안공학연구지원센터 2015 International Journal of Hybrid Information Techno Vol.8 No.7

In engineering, solving divergence and long solving time often occurs when solving large complex dynamic equations. Comparative analysis of Newmark and Rungekutta method fora complex dynamic model canprovidea theory basis for the selection of numerical integration method when solving complex dynamic equation.The comparative analysis on the solving precision and solving time by Newmark method andRungekutta method for calculating a same complex dynamic equation is carried out. The calculation results show that the response results by these two methods are in strong consistency. But the Newmark method shortens the solving time by at least 3 orders comparing that of Rungekutta method. Furthermore, the response displacement by Newmark method in different integration steps is obtained. The results indicate that the response results become stable with integration step continues reducing under 0.1.

Optimal disc cutters plane layout design of the full-face rock tunnel boring machine (tbm) based on a multi-objective genetic algorithm

Junzhou Huo,Wei Sun,Jing Chen,Pengcheng Su,Liying Deng 대한기계학회 2010 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.24 No.2

Improving of the quality of the disc cutters’ plane layout design of the full-face rock tunnel boring machine (TBM) is the most effective way to improve the global performance of a TBM. The plane layout design of disc cutters contains multiple complex engineering technical requirements and belongs to a multi-objective optimization problem with multiple nonlinear constraints. Based on analysis of the technical requirements of the plane layout problem, an optimizing mathematical model was built. To obtain a set of design schemes for engineers to choose from, a multi-objective genetic algorithm (MOGA) was applied to carry out the optimization of the mathematical model. A constraint-domination principle was utilized to handle the constraints, and a nondominated sorting method was adopted to obtain Pareto solutions. Simulation results showed that the proposed method was efficient and accurate in obtaining the Pareto layout solutions.

Multi-directional coupling dynamic characteristics analysis of TBM cutterhead system based on tunnelling field test

Junzhou Huo,Hanyang Wu,Jing Yang,Wei Sun,Guangqing Li,Xiaolong Sun 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.8

The core component, TBM cutterhead, bears a multi-directional impact load because of its direct contact with rock during tunneling. Unreasonable cutter design and parameter set lead to severe vibration or abnormal injury during excavation, seriously affecting the efficiencyof the TBM tunneling. Therefore, study of cutterhead dynamics response under impact loads is one of the core content of TBMsystem design. TBM multi-degree-of-freedom coupled dynamic model contains different geological conditions, cutter speed, body mass,time-varying mesh stiffness, transmission error, etc. A method is proposed to solve the problem based on Newmark algorithm, whichfurther improves the solution efficiency. A tunneling field test was conducted, and the results verify the correctness of the model and thesimplified cutter system. The simulation results of the Dahuofang project show that: ① The calculation process of Newmark is simplified,the calculation speed increased 3-4 orders of magnitude higher than Runge-Kutta method, while the solving time was reduced from2.6e5 s to 155 s under the same precision; ② Compared with the results of two kinds of rock with compressive strength 150 MPa and95 MPa, the translational vibration amplitude ratio is 3.33 and axial vibration amplitude ratio is 2.08. It indicates that as the rock compressivestrength increases, the growth of the cutterhead’s vibration amplitude increase accelerated, rather than proportional increases;③ The vibration decreases along with the cutter speed becomes larger and the system becomes stabilized when the cutterhead speedturns into 4r/min. The cutter head speed clearly affects torsional, lateral and longitudinal vibration. The change rate has reached 0.53-0.61. Therefore, TBM should choose the right cutter speed to avoid bearing damage, seal failure and other serious accidents; ④ The translationalvibration of components decreases with the components’ mass increase. It has the greatest impact on the horizontal and verticalvibration of the big ring. The vibration changing rate of the big ring reaches 0.31. The big ring has almost no effect on the axial vibrationand overturn, but the energy consumed on rock cutting will be reduced as the mass increases. Body weight should be chosen reasonablyconsidering vibration,construction economy and internal excitation of parameters. The above conclusions provide a theoretical basis forTBM dynamics optimization design, vibration control and cutterhead architecture design.

Disc cutters’ layout design of the full-face rock tunnel boring machine (TBM) using a cooperative coevolutionary algorithm

Wei Sun,Junzhou Huo,Jing Chen,Zhen Li,Xu Zhang,Li Guo,Haifeng Zhao,Yu Zhao 대한기계학회 2011 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.25 No.2

In rock TBM design the disc cutters’ layout design of the full-face rock tunnel boring machine (TBM) is one of the key technologies. However, there are few published papers in literatures for various reasons. In this paper, based on the engineering technical requirements and the corresponding cutter head’s structure design requirements, a nonlinear multi-objective disc cutters’ layout mathematical model with complex constraints and the corresponding multi-stage solution strategy are presented, in which the whole disc cutters’ layout design process is decomposed into the disc cutters’ spacing design and the disc cutters’ plane layout design. A numerical simulation method based on the FEM theory is adopted to simulate the rock chipping process induced by three TBM disc cutters to determine the optimal cutter spacing. And a cooperative coevolutionary genetic algorithm (CCGA) is adopted to solve the disc cutters’ plane layout design problem. Finally, a disc cutters’ layout design instance of the TBM is presented to demonstrate the feasibility and effectiveness of the proposed method. The computational results show that the proposed method can be used to solve the disc cutters’ layout design problem of the TBM and provide various layout schemes within short running times for the engineers to choose from.

Measured and investigated nonlinear dynamics parameters on bolted flange joints of combined rotor

Tao Li,Dongjian Yang,Binbin Zhao,Qingchao Sun,Junzhou Huo,Wei Sun 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5

The complex micro-slip phenomenon of the contact interface will lead to the nonlinear stiffness of the connection structure, as well as the structural damping and energy dissipation. As the most important connection structure of the combination rotor, the mechanical properties of bolted flange joint interface are needed in the dynamic analysis of the combined rotor. Therefore, it is urgent to model and test the friction contact interface in the nonlinear dynamic analysis of rotor. In this paper, two sets of mechanical characteristics test system were built to test the dynamic parameters of tangential and bending directions of the bolted flange joint interface. Then, the mechanical behavior and the change regularities of dynamics parameters were studied under different external excitation, bolt distribution and tightening torque. The results show that once the bolt preload is above the rated torque, stiffness softening behavior is not significant; and then the tangential stiffness of the joint interface tends to be stable, with the variation range of 8.08~8.96e8 N/m; the equivalent bending stiffness coefficient is about 3.38~3.83e6 N·m/rad. With the decrease of bolt preload, the external excitation and the number of bolts have a significant effect on the stiffness reduction of the joint. Finally, the change interval of the dynamics parameters of the interface obtained by the experiment provide basis for the uncertainty dynamic analysis and optimization of the rotor.

Experimental research for the protective effect of Naoxingtong-containing serum on rat cerebral microvascular endothelial cells

Jun, Zhou,Jianyou, Guo,Jian, Guo,Lanfang, Li,Canghai, Li,Nan, Jiang,Shuying, Guo,Hairu, Huo,JiangTingliang, JiangTingliang Kyung Hee Oriental Medicine Research Center 2005 Oriental pharmacy and experimental medicine Vol.5 No.2

The protective effect of Naoxingtong (NXT) on rat cerebral microvascular endothelial cell (rCMEC) was investigated. rCMEC was injured in vitro by incubating for 4 hours at 100% NO in a hypoxia chamber. After treated with NXT-containing serum, the cellular viability rate (90.3%) was significantly elevated when compared with that of control group and the inhibitive rate of lactic dehydrogenase activity (9.2%) was far lower than the control group with dose-dependent effect. The results indicate that NXT can increase viability of rCMEC, and protect cell membrane from injury during hypoxia.