Dynamic Destruction of High Pressure Water to the Mining Floor Deformation

2011 ◽  
Vol 121-126 ◽  
pp. 3361-3365
Author(s):  
Wen Bin Sun ◽  
Wei Jia Guo ◽  
Jin Xiao Liu
Keyword(s):  
High Pressure ◽  
Transient Flow ◽  
Three Dimensional ◽  
Underground Water ◽  
Deep Well ◽  
Fracture Development ◽  
Destructive Action ◽  
Pressure Water ◽  
The One ◽  
The Impact

At present, the mines in our country gradually shift from the shallow mining to the deep mining, but the deep well floor is particularly serious hazard by high pressure underground water.This article considers the high pressure underground water as three-dimensional transient flow, sets up mechanical model by combining mechanical knowledge and to analyze the destructive action on floor from two aspects. On the one hand, researching the impact destruction of high pressure water at different positions of floor ; the other hand, to analyze mechanical function on fracture development from high pressure water.

scholarly journals Performance Analysis and Optimization of CRNs Based on Fixed Feedback Probability Mechanism with Two Classes of Secondary Users

2019 ◽  
Vol 2019 ◽  
pp. 1-10 ◽  
Author(s):  
Yuan Zhao ◽  
Hongyi Li ◽  
Jiemin Liu
Keyword(s):  
Performance Indicators ◽  
Three Dimensional ◽  
Secondary Users ◽  
Lower Priority ◽  
Fixed Parameter ◽  
One Step ◽  
The One ◽  
The Impact ◽  
Retransmission Control ◽  
Transfer Probability

In this paper, we conduct a research based on the classified secondary users (SUs). SUs are divided into two categories: higher-priority SU1 and lower-priority SU2, and two types of users generate two types of packets, respectively. Due to the lowest spectrum usage rights of SU2 packets, the SU2 packets’ transmission is easily interrupted by other packets with higher rights. With the purpose of controlling the SU2 packets’ retransmission behavior, we introduce two system parameters, namely, feedback threshold T and feedback probability q. When the amount of SU2 packets in the buffer reaches the feedback threshold T, the interrupted SU2 packets either enter the buffer with probability q for retransmission or leave the channel by probability 1−q, where q is a fixed parameter. We construct a three-dimensional Markov model based on the presented retransmission control mechanism and derive some important performance indicators of SU2 packets based on the one-step transfer probability matrix and steady-state distribution. Then, we analyze the impact of some key parameters on the performance indicators through numerical experiments. Finally, we establish a cost function and use particle swarm optimization algorithm to optimize the feedback threshold and feedback probability.

Three-dimensional effects in low-strain integrity testing of piles: analytical solution

2016 ◽  
Vol 53 (2) ◽  
pp. 225-235 ◽  
Author(s):  
Changjie Zheng ◽  
George P. Kouretzis ◽  
Xuanming Ding ◽  
Hanlong Liu ◽  
Harry G. Poulos
Keyword(s):  
Impact Load ◽  
Three Dimensional ◽  
Three Dimensions ◽  
Integrity Testing ◽  
Integrity Tests ◽  
The One ◽  
Propagation Of Waves ◽  
The Impact ◽  
Pile Integrity ◽  
Elastic Soil

The interpretation of low-strain integrity tests of piles is commonly based on methods developed around the one-dimensional wave propagation theory. In reality, waves resulting from the impact of a hammer on a pile head propagate in three dimensions, and the validity of the plane-front assumption is rather questionable for cases where the size of the hammer is small relative to that of the pile. This paper presents an analytical model of the dynamic response of a pile to an impact load on its head, considering propagation of waves in both vertical and radial directions. The proposed formulation applies to a pile of finite length embedded in multilayered elastic soil, and allows for considering both shape and material pile defects, by reducing locally the radius of the pile cross section or the Young’s modulus of its material. Arithmetic examples are used to depict the effect of high-frequency interferences on the interpretation of pile integrity tests, which can only be accounted for in the three-dimensional formulation of the problem, and lead to practical suggestions for the interpretation of such tests.

scholarly journals Professional Mobility and “Objective” and “Subjective” Satisfaction. a Non- Linear Analysis from the Theory of the Three-Dimensional Spiral of Sense in Population of Doctors

2016 ◽  
Vol 6 (1) ◽  
pp. 52
Author(s):  
Miriam Aparicio
Keyword(s):  
Social Representations ◽  
Three Dimensional ◽  
Professional Status ◽  
Structural Factors ◽  
Professional Careers ◽  
Professional Mobility ◽  
National University ◽  
Micro Level ◽  
The One ◽  
The Impact

This work goes along the lines of the author’s research (1995-2016) on professional careers and models bearing causes and effects regarding sustained interaction (core, psychosocial, institutional and structural factors). The aim of this paper was analyze, through the doctors’ social representations, the levels of satisfaction evidenced by those who have advanced professionally to the highest positions within the scientific (or other) system. The hypothesis states that the relation is not linear but inverse. Satisfaction would not increase according to the Professional Status. We consider here, on the one hand, the insufficient Professionalization and the increasing demands from the market; and on the other, the impact structural limits have on the micro level. The methodology used was quanti-qualitative (semi-structured questionnaires, interviews, and hierarchical evocations). The population consisted of doctors (2005-2012) from the National University of Cuyo, in Argentina and the Cnam (France) of different courses of study. The results confirm the hypothesis. As regards what was observed among those who advanced professionally, the increase on the growing market demands along with the lack of institutionalized means in order to reach goals, result in lower satisfaction. This is interpreted from the theory of the author, which involves 3 levels (macro-meso-micro-macro) (Aparicio, 2015 a, b). We also consider the theories of anomie and of the expectancy of valence (Feather - Davenport). Findings along this line were also seen in studies with scientists (Aparicio, 2014). The results propose a revision in the prevailing working conditions and police: satisfaction acts on subsystems and consolidates them.

scholarly journals Exploration on Application of High Pressure Water Jet Cleaning Technology

2021 ◽  
Vol 353 ◽  
pp. 01006
Author(s):  
Xinjian Xu ◽  
Zhaoxing Meng ◽  
Haiqiang Lv
Keyword(s):  
High Pressure ◽  
New Technology ◽  
Three Dimensional ◽  
Water Jet ◽  
Cleaning Machine ◽  
Pressure Water ◽  
Improvement Measures ◽  
High Pressure Water Jet ◽  
The Times ◽  
Cleaning Technology

at present, the three-dimensional cleaning machine involved in tank car cleaning technology in China has full-automatic function, which includes two main structures: three-dimensional positioning machine and high-pressure cleaning machine. However, the tank car cleaning process used in the railway field still has many shortcomings. For example, serious pollution, serious energy consumption, insecurity, etc. In order to improve such defects, it is necessary to introduce new processes and improve the previous cleaning processes. The introduction of new technology can reduce environmental pollution and save capital cost. It can adapt to the development of the times and meet people's needs. Therefore, this paper expounds and analyzes the high-pressure water jet cleaning technology in railway tank cars from the aspects of application and improvement, and puts forward the corresponding improvement measures for reference.

Vortex Transport and Blade Interactions in High Pressure Turbines

2003 ◽  
Author(s):  
V. S. P. Chaluvadi ◽  
A. I. Kalfas ◽  
H. P. Hodson
Keyword(s):  
High Pressure ◽  
Flow Field ◽  
Rotor Blade ◽  
Delta Wing ◽  
Classical Model ◽  
Three Dimensional ◽  
Axial Flow ◽  
Passage Vortex ◽  
Blade Row ◽  
The Impact

This paper presents a study of the three-dimensional flow field within the blade rows of a high-pressure axial flow steam turbine stage. Half-delta wings were fixed to a rotating hub to simulate an upstream rotor passage vortex. The flow field is investigated in a Low-Speed Research Turbine using pneumatic and hot-wire probes downstream of the blade row. The paper examines the impact of the delta wing vortex transport on the performance of the downstream blade row. Steady and unsteady numerical simulations were performed using structured 3D Navier-Stokes solver to further understand the flow field. The loss measurements at the exit of the stator blade showed an increase in stagnation pressure loss due to the delta wing vortex transport. The increase in loss was 21% of the datum stator loss, demonstrating the importance of this vortex interaction. The transport of the stator viscous flow through the rotor blade row is also described. The rotor exit flow was affected by the interaction between the enhanced stator passage vortex and the rotor blade row. Flow underturning near the hub and overturning towards the mid-span was observed, contrary to the classical model of overturning near the hub and underturning towards the mid-span. The unsteady numerical simulation results were further analysed to identify the entropy producing regions in the unsteady flow field.

Aerodynamic Analysis of a Multistage Centrifugal Compressor

2003 ◽  
Author(s):  
Duccio Bonaiuti ◽  
Andrea Arnone ◽  
Alberto Milani ◽  
Leonardo Baldassarre
Keyword(s):  
Flow Field ◽  
Centrifugal Compressor ◽  
Three Dimensional ◽  
Operating Range ◽  
Aerodynamic Analysis ◽  
Critical Elements ◽  
Multi Stage ◽  
The One ◽  
Multistage Centrifugal Compressor ◽  
The Impact

The aerodynamic analysis of a four–stage centrifugal compressor was performed by means of a three–dimensional multi stage CFD code. The whole operating range of the compressor was investigated and the critical elements affecting the choke and stall limit were identified. The isolated impellers were also analyzed separately and the flow field was compared to the one coming from the multistage analysis. This allowed us to study the effect of the interactions between components and quantify the impact of the multistage environment on the impellers’ performance.

i4.0, 3D printing, deglobalisation and new manufacturing clusters: The view from Australia

2020 ◽  
pp. 103530462098142
Author(s):  
Al Rainnie
Keyword(s):  
Manufacturing Industry ◽  
New Technologies ◽  
Manufacturing Sector ◽  
Three Dimensional ◽  
Three Dimensional Printing ◽  
Jel Code ◽  
The One ◽  
The Impact ◽  
Dimensional Printing ◽  
Work And Employment

Before the COVID-19 pandemic erupted onto the world stage, a new narrative was apparently beginning to emerge about the impact of i4.0 and new technologies in general, and three-dimensional printing in particular, on the future of work and employment. This was to have particular geographical implications for the manufacturing sector in particular. Proponents of i4.0 also suggested that this process, particularly in manufacturing, would promote the re-emergence of patterns of clustering. Developments in advanced manufacturing, particularly three-dimensional printing, would accelerate and reinforce these tendencies. This article looks at the role that three-dimensional printing is supposed to play in the new world, and in particular, critically evaluates its role in reinforcing the trend towards deglobalisation on the one hand, and, on the other, new clusters of manufacturing industry. JEL code: O33

scholarly journals Two and Three-Dimensional Fluid Transients

1968 ◽  
Vol 90 (4) ◽  
pp. 501-509 ◽  
Author(s):  
V. L. Streeter ◽  
E. B. Wylie
Keyword(s):  
Transient Flow ◽  
Three Dimensional ◽  
Low Velocity ◽  
Irregular Boundary ◽  
Flow Equations ◽  
Flow Problems ◽  
Fluid Transients ◽  
The One ◽  
Irregular Boundary Conditions ◽  
The Continuum

The paper presents an approach for the analysis of low-velocity two and three-dimensional transient fluid-flow problems. The method assumes the continuum can be represented by a latticework of piping elements and that motion in the continuum can be described by solving the one-dimensional transient flow equations in the piping elements. The approach offers the advantage of being able to handle unusual and irregular boundary conditions, fixed or moveable, but restricted to the limitation of low Mach number. Undesirable grid characteristics are identified and comparisons with known hydrodynamic solutions are presented.

scholarly journals Professional Mobility and “Objective” and “Subjective” Satisfaction. a Non- Linear Analysis from the Theory of the Three-Dimensional Spiral of Sense in Population of Doctors

2016 ◽  
Vol 2 (4) ◽  
pp. 52
Author(s):  
Miriam Aparicio
Keyword(s):  
Social Representations ◽  
Three Dimensional ◽  
Professional Status ◽  
Structural Factors ◽  
Professional Careers ◽  
Professional Mobility ◽  
National University ◽  
Micro Level ◽  
The One ◽  
The Impact

This work goes along the lines of the author’s research (1995-2016) on professional careers and models bearing causes and effects regarding sustained interaction (core, psychosocial, institutional and structural factors). The aim of this paper was analyze, through the doctors’ social representations, the levels of satisfaction evidenced by those who have advanced professionally to the highest positions within the scientific (or other) system. The hypothesis states that the relation is not linear but inverse. Satisfaction would not increase according to the Professional Status. We consider here, on the one hand, the insufficient Professionalization and the increasing demands from the market; and on the other, the impact structural limits have on the micro level. The methodology used was quanti-qualitative (semi-structured questionnaires, interviews, and hierarchical evocations). The population consisted of doctors (2005-2012) from the National University of Cuyo, in Argentina and the Cnam (France) of different courses of study. The results confirm the hypothesis. As regards what was observed among those who advanced professionally, the increase on the growing market demands along with the lack of institutionalized means in order to reach goals, result in lower satisfaction. This is interpreted from the theory of the author, which involves 3 levels (macro-meso-micro-macro) (Aparicio, 2015 a, b). We also consider the theories of anomie and of the expectancy of valence (Feather - Davenport). Findings along this line were also seen in studies with scientists (Aparicio, 2014). The results propose a revision in the prevailing working conditions and police: satisfaction acts on subsystems and consolidates them.

Hydromechanics Analysis with Flow-Field Characteristics of High Pressure Water-Jet in Sloping Bottom Hole of Radial Horizontal Drilling

2014 ◽  
Vol 952 ◽  
pp. 190-193
Author(s):  
Xian Zhong Yi ◽  
Song Lin Yi ◽  
Hui Shu ◽  
Yuan Qiang Ji ◽  
Sheng Zong Jiang
Keyword(s):  
Flow Field ◽  
Simulation Analysis ◽  
Three Dimensional ◽  
Horizontal Drilling ◽  
Bottom Hole ◽  
Flow Field Characteristics ◽  
Pressure Water ◽  
High Pressure Water Jet ◽  
Radial Drilling ◽  
The Impact

According to the principle of fluid dynamics, the Fluent software is used for the numerical simulation analysis of three-dimensional single-hole nozzle submerged jet flow field of radial drilling inclined shaft. The results show that when the bottom is tilted, there are two sizes of spiral along the center axis, and the vortices along tilt direction of the wall are stronger. When the jet source closes the bottom, the kinetic energy of jet is converted into the impact for the bottom of well, making the pressure of bottom hole on the wall have a tendency to rise.

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