Analysis of a Mathematical Model for Drilling System With Reverse Air Circulation by Using the ANN-BHCS Technique

Based on the outside cooling of the Passive Containment Cooling System (PCCS), a simplified containment mathematical model was built and was numerically solved. Air circulation driven by natural forces for a steady condition along with the coupled thermal-hydraulic phenomena was then obtained and analyzed. Variations of humid air temperature and velocity, water film sub-cooling and heat fluxes along the flow direction were discussed and driving forces were compared to obtain the ranked important phenomena of the PCCS outside cooling. The conclusions are significant to reasonably understand the PCCS outside transport phenomena.

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Mathematical Model for Manual Loading Activity in Underground mines

International Journal of Mechanical and Industrial Engineering ◽

10.47893/ijmie.2014.1199 ◽

2014 ◽

pp. 134-141

Author(s):

V. Vidyasagar ◽

Dr. P. N. Belkhode ◽

Dr. J.P. Modak

Keyword(s):

Mathematical Model ◽

Present Method ◽

Underground Mines ◽

Environmental Aspects ◽

Anthropometric Data ◽

Work Station ◽

Human Energy ◽

Time Required ◽

Air Circulation ◽

The Mathematical Model

The paper details the approach to improve the productivity and conserving human energy in Manual loading activity. Manual loading is one of the primary activities and consumes a good amount of time for the mining crew in the underground mines. With formulation of the mathematical model, improvements in the present method of Manual loading which can conserve human energy besides increasing the productivity and reducing the time required. This mathematical model predicts the optimization of Manual loading activity. Some of the variables used to formulate this model are (1) Environment of working area, which include the ergonomic aspects; i.e. various postures of the worker, anthropometric data of the miners and environmental aspects such as illumination, ambient temperature, relative humidity and air circulation facility around the work station (2)Tools used by miner which include geometric dimensions of tools, (3) Loading of the Ore per unit time, human energy consumption etc., based on the data collected of these variables, mathematical model is formulated.

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Mathematical Analysis of Possible Range of Stable Drilling in Offshore Riserless Drilling System

Volume 8: Polar and Arctic Sciences and Technology; Petroleum Technology ◽

10.1115/omae2017-62337 ◽

2017 ◽

Cited By ~ 1

Author(s):

Miki Y. Matsuo ◽

Tomoya Inoue ◽

Hide Sakaguchi

Keyword(s):

Mathematical Model ◽

Mathematical Analysis ◽

Deep Sea ◽

Earth Science ◽

Drill Pipe ◽

Drilling Process ◽

Stable Range ◽

External Perturbations ◽

Large Fluctuations ◽

Drilling System

In both of scientific and industrial drilling, it is not desirable to any have accompanying vibrations, large fluctuations, or other unexpected dynamics disturbing a steady and stable drilling process. One of the origins of such disturbances can be the flexibility of the drill pile; drill pipe is easily deformed by external perturbations because it is very long and slender. To specify the stable range of parameters of drill pipe, we theoretically and numerically analyzed a Cosserat-type mathematical model of drill pile. The values of the parameters of this model were set to appropriate values representing actual riserless drilling situations adopted in the operations of the scientific deep-sea drilling vessel Chikyu owned by the Japan Agency for Marine-Earth Science and Technology (JAMSTEC). We concluded that the buckling of pipe should be treated as a possible accident, but buckling does not happen in the normal operations of the Chikyu.

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Method for Calculating the Injection Effect to Create Air Circulation Inside Containers

International Journal of Innovative Technology and Exploring Engineering - Special Issue ◽

10.35940/ijitee.a9160.119119 ◽

2019 ◽

Vol 9 (1) ◽

pp. 3222-3224

Keyword(s):

Mathematical Model ◽

Structural Change ◽

Turbulent Flow ◽

Numerical Results ◽

Hydrodynamic Equations ◽

Injection Effect ◽

Air Circulation ◽

External Stream

The paper investigates the process of air circulation inside the container due to the effect of injection by an external stream. It is shown in the paper that injection can be created using the open hatch of the container, which is fixed at a certain angle. To calculate the emerging turbulent flow, a new effective mathematical model is used. The obtained numerical results of the hydrodynamic equations show that by a simple structural change in a simple container, air circulation inside the container can be significantly improved. This phenomenon gives a good perspective for the use of containers in the transportation of food.

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Oscillation Reconstruction and Bifurcation Analysis of a Drillbit–Rock Vibro-Impact System

International Journal of Bifurcation and Chaos ◽

10.1142/s0218127417500134 ◽

2017 ◽

Vol 27 (01) ◽

pp. 1750013 ◽

Cited By ~ 5

Author(s):

Maolin Liao ◽

Yinao Su ◽

Yingcao Zhou

Keyword(s):

Mathematical Model ◽

Numerical Continuation ◽

Simplified Model ◽

Percussive Drilling ◽

Impact System ◽

Codimension One ◽

Drilling System ◽

Parameter Continuation ◽

Two Parameter ◽

Parameter Bifurcation

A drillbit–rock vibro-impact system with a linear rock contact law is considered in this paper. This system is a simplified model to study the drillbit oscillation in a percussive drilling system. The main purpose of this work is to explore the optimized vibration condition of the drillbit to improve the drilling efficiency in practical drilling applications. In order to eliminate the influences of drilling progression on the dynamic analysis of drillbit oscillation, the drillbit oscillation is separated from its drift via oscillation reconstruction. The obtained bounded mathematical model is analyzed by numerical integration and numerical continuation. Based on the codimension-one bifurcations detected by TC-HAT during one-parameter continuation, the two-parameter bifurcation curves are traced by two-parameter continuation. These explored two-parameter bifurcation curves constitute the parameter boundaries for the period-one one-impact oscillation of drillbit, which is verified as the optimal oscillation with the highest drilling efficiency.

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