Numerical Modeling of the TBM Disc Cutter’s Kinematic Behavior during its Wear Process and Experimental Verification

2013 ◽  
Vol 321-324 ◽  
pp. 51-56 ◽  
Author(s):  
Qing Tan ◽  
Zhen Huan Zhu ◽  
Yi Min Xia ◽  
Lv Jian Xie ◽  
Xin Jian Sun ◽  
...  
Keyword(s):  
Numerical Modeling ◽  
Zero Point ◽  
Rock Cutting ◽  
Rock Breaking ◽  
Disc Cutter ◽  
Fem Model ◽  
Wear Process ◽  
Rotating Speed ◽  
Kinematic Behavior ◽  
Simulation Results

In order to determine the disc cutter’s kinematic behavior, a 3-D FEM model is established to simulate the rock cutting process in Abaqus, using a unique connector element and considering the failure effect of the rock. Then, by using this model, a series of numerical simulations during disc cutter’s wearing process have been performed. The results show that the speed zero point is jumping near the deepest rock breaking point, the rotating speed of the disc cutter varies while it is cutting rock and the average rotating speed increases during its wear process. In the end, the laboratory test is presented in detail, and the experiment results are in accordance with the simulation results.

Numerical Modeling of the Effects of Wears on Cutting Loads

2011 ◽  
Vol 308-310 ◽  
pp. 2340-2344 ◽  
Author(s):  
Xiao Yu Wang ◽  
Zong Xi Cai ◽  
Peng Cheng Su ◽  
Hai Feng Zhao ◽  
Yi Lan Kang
Keyword(s):  
Numerical Simulation ◽  
Numerical Modeling ◽  
Numerical Simulations ◽  
Penetration Depth ◽  
Normal Force ◽  
Disc Cutter ◽  
Fem Model ◽  
Simulation Results ◽  
Modified Formula ◽  
The Relationship

In order to determine the normal force acting on the TBM disc cutter, a 3-D FEM model is established to simulate the cutting process, with the failure effect of the rock. Afterwards, by using this model, a series of numerical simulations are performed. Based on the numerical simulation results, via modifying Evans formula, an improved formula is given. The modified formula indicates the relationship between the normal force acting on a single disc cutter and the penetration depth, and contains the influence of formation stress and wear.

Distribution Law of Excavating Load of TBM Disc Cutter and Cutterhead

2014 ◽  
Vol 615 ◽  
pp. 22-26
Author(s):  
Xiang Heng Zhu ◽  
Yi Min Xia ◽  
Tao Ouyang ◽  
Kai Yang
Keyword(s):  
Yield Criterion ◽  
Tunnel Boring Machine ◽  
Element Model ◽  
Rock Breaking ◽  
Disc Cutter ◽  
Distribution Law ◽  
Disc Cutters ◽  
Lateral Forces ◽  
Simulation Results ◽  
Thrust And Torque

Cutterheads and disc cutters are the key components of Tunnel Boring Machine (TBM) used to fulfill the rock-breaking task. In order to study the variation and distribution law of cutting forces induced by disc cutters on TBM cutterhead, a finite element model of rock-breaking process is established based on the extended Drucker-Prager yield criterion for rock and then the excavating process of cutterhead is simulated. The simulation results show that: in the rock fragmentation process, the rock-breaking forces are step changing; with the increase of installation radius, the vertical forces of inner and face cutters increase, while the lateral forces decrease; with the increase of installation angle, the vertical forces of edge disc cutters decrease, while the lateral forces increase; the mean total thrust and torque of cutterhead are 5418.2 kN and 1624.4 kN·m respectively, the simulation results are verified by engineering data.

scholarly journals Simulation and Experimental Study on Characteristics of Multiorifice Nozzle in Radial Jet Drilling

Geofluids ◽  
2022 ◽  
Vol 2022 ◽  
pp. 1-8
Author(s):  
Tao Zhang ◽  
Yumei Li ◽  
Hui Lu ◽  
Jianing Jiang
Keyword(s):  
Numerical Model ◽  
Oil And Gas ◽  
Rock Breaking ◽  
Experimental Investigations ◽  
Horizontal Drilling ◽  
Rotating Speed ◽  
Flow Displacement ◽  
Oil And Gas Resources ◽  
Jet Nozzle ◽  
Simulation Results

The radial jet drilling (RJD) is a key technology to improve the development efficiency of low-permeability oil and gas resources. In order to seek a reasonable hydraulic engineering parameter combination of hydraulic radial jet drilling, to obtain the optimal hydraulic energy distribution, a jet radial horizontal drilling simulation experiment system of the casing windowing is designed. A sequence of experimental investigations focused on engineering parameters of pump displacement, rotating speed, and frequency of high-pressure plunger pump is performed, and the operability and the feasibility of the experiment are verified. To evaluate the maximum drillable length and the self-propelled force of a jet nozzle, a 3D numerical model based on ANSYS-CFX is developed to evaluate the effects of the inlet flow displacement, the flow rates ratio K , and the angle ratio F : B of the forward orifice and backward orifice of the jet nozzle on its maximum drillable length and self-propelled force by sensitivity analysis. Finally, the comparison of numerical simulation results (Ln), mathematical results (Lm), and experiment results (Le) of the maximum drillable length are presented. It is observed that the simulation results are consistent with the experiment results with an average accuracy of 97.07%. Therefore, the proposed numerical model has a good performance in predicting the maximum drillable length of the multiorifice nozzle. The research results can provide theoretical guidance for improving the rock breaking and drilling capability of radial jet drilling technology.

The Analysis of the Parameters of Rock Cutting by Disc Cutter Based on ANSYS

2013 ◽  
Vol 791-793 ◽  
pp. 778-781
Author(s):  
An Ning Zhang ◽  
Feng Zhu ◽  
Zhao Feng Zhu
Keyword(s):  
Yield Criterion ◽  
Element Model ◽  
Rock Cutting ◽  
Rock Breaking ◽  
Disc Cutter ◽  
Vertical Force ◽  
Rock Damage ◽  
Plastic Yield ◽  
Rock Mechanical Properties ◽  
Tbm Cutter

When TBM tunneling, the disc cutter directly in contact with the rock. The disc cutter is an important component of the TBM, so the numerical simulation study of disc cutter breaking rock process is established. The study contents disc cutter exerted vertical force on the rock. This is instructive for improving the disc cutter layout and improving the rock breaking capacity and tunneling efficiency. According to the rock Drucker-Prager plastic yield criterion lines and rock mechanical properties, finite element model of rock breaking by disc cutter was established by ANSYSWORKBENCH software and process of rock cutting with disc cutter was simulated. The rock elastic-plastic deformation occurred in the disc cutter effect, caused accumulation of rock damage, when the rock breaks completely damaged, get the vertical force exerted on the disc cutter, which is significance for the disc cutter layout and the calculation of force of TBM cutter breaking rock.

Fractal Characteristics of Sandstone Cutting Fracture under Mechanical Shock Loading Conditions

2012 ◽  
Vol 226-228 ◽  
pp. 1789-1794 ◽  
Author(s):  
Shu Ren Wang ◽  
Paul Hagan ◽  
Yan Cheng
Keyword(s):  
Fractal Dimension ◽  
Size Distribution ◽  
Structural Integrity ◽  
Theoretical Calculations ◽  
Mesh Size ◽  
Rock Cutting ◽  
Weight Percent ◽  
Rock Breaking ◽  
Engineering Practice ◽  
Mechanical Shock

It is the key to guide rock-breaking design and engineering practice for how to obtain a reasonable test indicator to assess the cuttability of the rock. Some sandstone samples were tested by using the linear rock cutting machine in the school of mining engineering, University of New South Wales (UNSW), Australia. The curves characteristics for the weight percent of the broken debris with the mesh size distribution were obtained through the screening statistics. Furthermore, the fractal dimension of the specimen broken debris was derived through theoretical calculations and statistical analysis. The results showed that the rock cutting fragmentation is of significant fractal features under the mechanical shock loads. The broken debris fractal dimension of the structural integrity specimens is bigger, the range of the fractal dimension is smaller and the broken debris size distribution is more even than that of the poor structural integrity specimens. The fractal dimension is the ideal test indicator to assess and analysis the rock-breaking degree.

Development of a Simulation Model to Investigate Tool Wear in Ti-6Al-4V Alloy Machining

2011 ◽  
Vol 223 ◽  
pp. 535-544 ◽  
Author(s):  
Volker Schulze ◽  
Frederik Zanger
Keyword(s):  
Tool Wear ◽  
High Strength ◽  
State Variables ◽  
Wear Model ◽  
Fem Model ◽  
Load Variations ◽  
Wear Rates ◽  
Simulation Results ◽  
Mechanical Machining ◽  
Very High

Titanium alloys like Ti‑6Al‑4V have a low density, a very high strength and are highly resistant to corrosion. However, the positive qualities in combination with the low heat conductivity have disadvantageous effects on mechanical machining and on cutting in particular. Ti‑6Al‑4V forms segmented chips for the whole range of cutting velocities which influences tool wear. Thus, optimization of the manufacturing process is difficult. To obtain this goal the chip segmentation process and the tool wear are studied numerically in this article. Therefore, a FEM model was developed which calculates the wear rates depending on state variables from the cutting simulation, using an empirical tool wear model. The segmentation leads to mechanical and thermal load variations, which are taken into consideration during the tool wear simulations. In order to evaluate the simulation results, they are compared with experimentally obtained results for different process parameters.

Study on Rock-Breaking Simulation and Experiment of Double Disc Cutter of TBM

2016 ◽  
Vol 23 ◽  
pp. 80-88
Author(s):  
F. Lu ◽  
C. Zhang ◽  
J. Sun ◽  
J.X. Tian ◽  
M. Liu ◽  
...  
Keyword(s):  
Rock Breaking ◽  
Disc Cutter ◽  
Element Analysis ◽  
Breaking Effect ◽  
The Finite Element Analysis ◽  
Breaking Mechanism ◽  
Simulation And Experiment ◽  
Tbm Cutter ◽  
Cutter Spacing ◽  
The Impact

In order to improve working efficiency of the tunneling process and extend working life of disc cutter, explore the impact of cutter spacing and loading for the cutter rock-breaking effect. With the theory of rock crushing, Based on the finite element analysis software ABAQUS, the process of disc cutter breaking rock is simulated, considering the adjacent cutters sequential constraints, then, to make sure two cutter space with the method of SE in experiment.The simulation results showed that the optimal cutter spacings were both about 80mm in the same loading and the sequentially loading, but the rock-breaking effect of sequentially loading is better than the same loading. The experimental data showed that the minimum specific energy of rock breaking is appeared cutter spacing between 80mm and 90mm. Thus, the correctness and rationality of the simulation was verified. The study is good for understanding the rock-breaking mechanism of double disc cutter and has a certain promoting value to optimize TBM cutter system.Keywords:TBM, rock fragmentation, ABAQUS, cutter spacing, sequentially cutting

scholarly journals Numerical modeling of microwave heating

2010 ◽  
Vol 42 (1) ◽  
pp. 99-124 ◽  
Author(s):  
A.K. Shukla ◽  
A. Mondal ◽  
A. Upadhyaya
Keyword(s):  
Thermal Conductivity ◽  
Numerical Modeling ◽  
Temperature Distribution ◽  
Microwave Heating ◽  
Two Dimensional ◽  
Conventional Furnace ◽  
Microwave Furnace ◽  
Simulation Results ◽  
Heating Behavior ◽  
Cylindrical Samples

The present study compares the temperature distribution within cylindrical samples heated in microwave furnace with those achieved in radiatively-heated (conventional) furnace. Using a two-dimensional finite difference approach the thermal profiles were simulated for cylinders of varying radii (0.65, 6.5, and 65 cm) and physical properties. The influence of susceptor-assisted microwave heating was also modeled for the same. The simulation results reveal differences in the heating behavior of samples in microwaves. The efficacy of microwave heating depends on the sample size and its thermal conductivity.

Influence of Inflow Distributions on Swirling Flow in Rotor-Stator Cavity With Centripetal and Centrifugal Superposed Flow

2020 ◽  
Author(s):  
Yu Shi ◽  
Shuiting Ding ◽  
Tian Qiu
Keyword(s):  
Swirling Flow ◽  
Flow Region ◽  
Reynolds Numbers ◽  
Meridian Plane ◽  
Typical Structure ◽  
Rotating Speed ◽  
Momentum Coefficient ◽  
Aero Engine ◽  
Sst Turbulence Model ◽  
Simulation Results

Abstract The disk cavity of the rotor-stator system is one of important parts of the aero-engine air system. The rotating speed of airflow determines the relative velocity between the airflow and the rotating assembly, so the maintaining characteristic for swirling flow of the rotor-stator cavity will affect the windage of the rotating assembly in the cavity, and the exporting characteristic for swirling flow of the rotor-stator cavity will affect the windage of the rotating assembly in the downstream chamber. Dual-inlet rotor-stator disk cavity is a typical structure of aero-engine. But there are few reports about the flow structure in the dual-inlet rotor-stator disk cavity in the open literature. In this paper, the influence of inflow distributions on maintaining and exporting characteristics for swirling flow was investigated by numerical simulation, aiming at the interaction between the two inflows. The SST turbulence model was well validated against published experimental results. The simulation results show that there are two flow regions in the rotor-stator cavity from the perspective of meridian plane, and there is a rotating vortex in each flow region. In order to quantify the rotational capacity of the airflow, the angular momentum coefficient was defined. Under different inflow distribution ratios, the sizes of the dominant regions of the two vortices in the cavity get varied, which results in the variation of maintaining and exporting characteristics for swirling flow. It was also found that inflow distributions have the same effect on maintaining and exporting characteristics for swirling flow under different rotational Reynolds numbers and different throughflow coefficients, but the capacity of maintaining and exporting swirling flow are different.

Numerical Modeling of Air Flow in a Cabinet Dryer Equipped by Deflector Plates

2019 ◽  
Vol 15 (10) ◽  
Author(s):  
Omid Reza Roustapour ◽  
Hamid Reza Gazor ◽  
Kazemi Farzin
Keyword(s):  
Fluid Dynamics ◽  
Numerical Modeling ◽  
Air Flow ◽  
Outlet Temperature ◽  
Governing Equations ◽  
Air Velocity ◽  
Drying Time ◽  
Elapsed Time ◽  
Quadrilateral Elements ◽  
Simulation Results

AbstractIn this study, air deflector plates were used in order to increase the air elapsed time in the chamber. The air flow pattern was simulated using computational fluid dynamics. The geometry of the chamber was produced in 2D and meshed by triangular and quadrilateral elements, boundary conditions were defined and the governing equations solved. Modeling of flow without any deflectors depicted the air flowed to the chamber conducted to the outlet without any distortion. Air vortices were generated when the deflectors defined in model. To evaluate the influence of deflectors on drying period, constructed plates installed in the dryer chamber and melon slices were dried when deflectors used or not. Simulation results showed magnitude of the air velocity was increased and temperature uniform distribution developed on the surface of trays. The outlet temperature was also decreased up to 10 % and drying time reduced to 22 % when the deflectors were employed.

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