scholarly journals A New Method for the Calculation of Energy and Power Requirements of Bucket Wheel Excavators

2019 ◽  
Vol 10 (1) ◽  
pp. 15-20
Author(s):  
József András ◽  
József Kovács ◽  
Endre András ◽  
Ildikó Kertész ◽  
Ovidiu Bogdan Tomus
Keyword(s):  
Energy Consumption ◽  
Numerical Method ◽  
Horizontal Plane ◽  
Vertical Plane ◽  
New Method ◽  
Energy Requirements ◽  
Belt Conveyor ◽  
Analytical Formulas ◽  
Power And Energy ◽  
Continuous Working

Abstract The bucket wheel excavator (BWE) is a continuous working rock harvesting device which removes the rock by means of buckets armoured with teeth, mounted on the wheel and which transfers rock on a main hauling system (generally a belt conveyor). The wheel rotates in a vertical plane and swings in the horizontal plane and raised / descended in the vertical plane by a boom. In this paper we propose a graphical-numerical method in order to calculate the power and energy requirements of the main harvesting structure (the bucket wheel) of the BWE. This approach - based on virtual models of the main working units of bucket wheel excavators and their working processes - is more convenient than those based on analytical formulas and simplification hypotheses, and leads to improved operation, reduced energy consumption, increased productivity and optimal use of available actuating power.

scholarly journals A grafo-numeric method of determination of the operation power of the rotor of EsRc-1400 bucket wheel excavator using computer simulation in SolidWorks

2019 ◽  
Vol 290 ◽  
pp. 04007
Author(s):  
Florin Dumitru Popescu ◽  
Sorin Mihai Radu ◽  
Andrei Andraş ◽  
Ildiko Kertész Brînaş
Keyword(s):  
Computer Simulation ◽  
Energy Consumption ◽  
Specific Energy ◽  
Horizontal Plane ◽  
Specific Energy Consumption ◽  
Vertical Plane ◽  
Conveyor System ◽  
Method Of Determination ◽  
Loading System

The bucket wheel excavator (BWE) is a complex continuous digging machine, used to excavate material using a layout of buckets installed on a rotor (bucket wheel), and at the same time, using the conveyor system installed on its boom, transferring this material to the main conveyor. The bucket wheel is the operating equipment, and it rotates in the vertical plane and performs (with the boom) a pivoting movement in the horizontal plane and an ascendant – descendent movement in the vertical plane. The paper presents a new grafo-numeric method of determination of the operation power of the BWE rotor, using computer simulation in SolidWorks. The aim of using virtual models for the analysis of the operation of some components of the BWE is to reduce the specific energy consumption during cutting while maintaining the installed operation power of the rotor, to increase the excavation capacity and to improve the cutting – loading system.

scholarly journals Analysis of Moving Chord Inclination Angles when Determining Curvature of Track Axis

2021 ◽  
pp. 92-103
Author(s):  
Wladyslaw Koc
Keyword(s):  
High Precision ◽  
Horizontal Plane ◽  
Vertical Plane ◽  
New Method ◽  
Turning Angle ◽  
Circular Arc ◽  
Inclination Angles ◽  
The Difference ◽  
Chord Method ◽  
Very High

The analysis presented in the paper explains computational issues related to the use of a new method of determining the curvature of the track axis – the so-called moving chord method. It indicates the versatility of this method – it may be used both in a horizontal and vertical plane. It also draws attention to its very high precision, as evidenced by the exemplary geometric cases under consideration. The focus here is on the computational foundations of the discussed method regarding the angles of inclination of the moving chord. It was found that for a circular arc in the horizontal plane, the inclination angles of the moving chord depend on the track turning angle, while the difference in inclination angles depends only on the radius of the arc. In the case of a circular arc in the vertical plane, the moving chord inclination angles are much smaller than in the horizontal plane, which is connected with the range of the applied radii of the arcs. As in the horizontal plane, the radius of the vertical curve is the only factor that determines the discrepancy in the inclination angles of the moving chord.

scholarly journals Dielectric anisotropy as indicator of crystal orientation fabric in Dome Fuji ice core: method and initial results

2021 ◽  
pp. 1-12
Author(s):  
Tomotaka Saruya ◽  
Shuji Fujita ◽  
Ryo Inoue
Keyword(s):  
Crystal Orientation ◽  
Horizontal Plane ◽  
Ice Core ◽  
Vertical Plane ◽  
Vertical Direction ◽  
Core Sample ◽  
Dielectric Anisotropy ◽  
Principal Axes ◽  
Polycrystalline Ice ◽  
Initial Results

Abstract Polycrystalline ice is known to exhibit macroscopic anisotropy in relative permittivity (ɛ) depending on the crystal orientation fabric (COF). Using a new system designed to measure the tensorial components of ɛ, we investigated the dielectric anisotropy (Δɛ) of a deep ice core sample obtained from Dome Fuji, East Antarctica. This technique permits the continuous nondestructive assessment of the COF in thick ice sections. Measurements of vertical prism sections along the core showed that the Δɛ values in the vertical direction increased with increasing depth, supporting previous findings of c-axis clustering around the vertical direction. Analyses of horizontal disk sections demonstrated that the magnitude of Δɛ in the horizontal plane was 10–15% of that in the vertical plane. In addition, the directions of the principal axes of tensorial ɛ in the horizontal plane corresponded to the long or short axis of the elliptically elongated single-pole maximum COF. The data confirmed that Δɛ in the vertical and horizontal planes adequately indicated the preferred orientations of the c-axes, and that Δɛ can be considered to represent a direct substitute for the normalized COF eigenvalues. This new method could be extremely useful as a means of investigating continuous and depth-dependent variations in COF.

The effects of variable mechanical parameters on peak power and energy consumption of ankle-foot prostheses at different speeds

2018 ◽  
Vol 32 (23) ◽  
pp. 1229-1240 ◽  
Author(s):  
Dianbiao Dong ◽  
Bryan Convens ◽  
Yuanxi Sun ◽  
Wenjie Ge ◽  
Pierre Cherelle ◽  
...  
Keyword(s):  
Energy Consumption ◽  
Peak Power ◽  
Mechanical Parameters ◽  
Power And Energy

Characteristics Analyses of Energy Consumption for Boom Closed Circuit of Hydraulic Excavators

2012 ◽  
Vol 170-173 ◽  
pp. 3491-3494
Author(s):  
Ming Dong Chen ◽  
Ding Xuan Zhao
Keyword(s):  
Energy Consumption ◽  
Mathematical Models ◽  
Operating Conditions ◽  
Closed Circuit ◽  
Load Drop ◽  
Hydraulic Pump ◽  
Full Load ◽  
Power Characteristics ◽  
Hydraulic Excavators ◽  
Power And Energy

The boom with closed circuit in Hydraulic Excavators, which is made up of motor, hydraulic pump and accumulator, was put forward based on analysis of the operating condition of ordinary hydraulic excavators and mathematical models of system were built. Power characteristics of main power elements were obtained under typical operating conditions, and then the energy consumption characteristics were analyzed. The results show that the installed power and energy consumption will be reduced using boom with closed circuit, and no-load drop and full load rise of boom are the worst operating conditions.

scholarly journals Performance of falling film plate evaporators in reconstructed multiple-effect evaporation station in sugar factory

2006 ◽  
Vol 10 (4) ◽  
pp. 55-61 ◽  
Author(s):  
Zoltan Zavargo ◽  
Aleksandar Jokic ◽  
Bojana Prodanic ◽  
Jasna Grbic ◽  
Rada Jeftic-Mucibabic
Keyword(s):  
Heat Transfer ◽  
European Union ◽  
Energy Consumption ◽  
General Trend ◽  
Regional Level ◽  
Energy Requirements ◽  
Falling Film ◽  
Evaporation Process ◽  
Transfer Coefficients ◽  
Heat Transfer Coefficients

General trend of free trade in regional level as well as in the direction of European Union has motivated sugar factories located in Serbia to invest into technologies that are more efficient in order to make their products more competitive at the markets in Europe. The aim of this work was to evaluate effects of falling film plate evaporators on the energy consumption of evaporation plant, as well as to validate performance of this type of evaporators. It was found that this type of evaporator decreased energy requirements and in the same time evaporation process was more effective due to high values of heat transfer coefficients. .

scholarly journals Protection against CNS Ischemia by Temporary Interruption of Function-Related Processes of Neurons

1995 ◽  
Vol 15 (3) ◽  
pp. 433-439 ◽  
Author(s):  
Adelbert Ames ◽  
Kenneth I. Maynard ◽  
Stuart Kaplan
Keyword(s):  
Energy Consumption ◽  
Continuous Monitoring ◽  
Glucose Utilization ◽  
Complete Loss ◽  
Full Recovery ◽  
Energy Requirements ◽  
Ischemic Damage ◽  
Fold Reduction ◽  
Pharmacologic Agents ◽  
Reducing Energy

Previous studies have shown that most of the energy consumption of CNS tissue is used for processes that subserve signaling functions of the cells. Since these function-related processes are probably not essential to cell viability, blocking them reversibly with a combination of pharmacologic agents should protect cells from a reduction in energy metabolism. Preliminary experiments to test this hypothesis were performed on isolated rabbit retinas. They were maintained in a newly devised chamber that permitted continuous monitoring of electrophysiological function for ≥8 h. Ischemia was simulated by a 6-fold reduction in both O2 and glucose. This caused a rapid ( t1/2 75 s) and complete loss of the light-evoked response in the optic nerve. Untreated retinas showed full recovery after ½ h of deprivation, but only 50% recovery after 1 h and little or no recovery after 2 or 3 h. Retinas exposed during 3 h of deprivation to a combination of six agents that abolished electrophysiologic function and reduced glucose utilization [tetrodotoxin (TTX), 2-amino-4-phosphonobutyric acid (APB), 2-amino-5-phosphonovaleric acid (APV), amiloride, Mg2+, and Li+] showed full recovery. We conclude that reducing energy requirements by blocking functional processes can prevent ischemic damage.

Application Research of a New Overrunning Clutch in Belt Conveyor

2012 ◽  
Vol 479-481 ◽  
pp. 890-893 ◽  
Author(s):  
Tong Long Xue
Keyword(s):  
Energy Consumption ◽  
Power Factor ◽  
Application Research ◽  
Belt Conveyor ◽  
Electric System ◽  
Normal Operating ◽  
Driven System ◽  
Reduce Energy Consumption ◽  
System Power ◽  
Conveyor Roller

In mine high-power belt conveyor, the driven system commonly used multi-motor-driven program. After starting the conveyor, the lower power is needed in normal operating of the conveyor, this appears serious “big horse pulling small car” phenomenon. Therefore, using a new overrunning clutch, when normal operating of belt conveyor is ensured by some motors, you can cut off a group or two groups of gearbox and motor running. This will not only reduce the load of the belt conveyor roller, and reduce energy consumption of gearbox and motor, and also improve the electric system power factor. It means significant energy saving there.

Many-legged maneuverability: dynamics of turning in hexapods

1999 ◽  
Vol 202 (12) ◽  
pp. 1603-1623 ◽  
Author(s):  
D.L. Jindrich ◽  
R.J. Full
Keyword(s):  
Horizontal Plane ◽  
Center Of Mass ◽  
Vertical Plane ◽  
Force Production ◽  
The Body ◽  
Mean Velocity ◽  
Blaberus Discoidalis ◽  
Body Design ◽  
Reaction Forces ◽  
Straight Ahead

Remarkable similarities in the vertical plane of forward motion exist among diverse legged runners. The effect of differences in posture may be reflected instead in maneuverability occurring in the horizontal plane. The maneuver we selected was turning during rapid running by the cockroach Blaberus discoidalis, a sprawled-postured arthropod. Executing a turn successfully involves at least two requirements. The animal's mean heading (the direction of the mean velocity vector of the center of mass) must be deflected, and the animal's body must rotate to keep the body axis aligned with the heading. We used two-dimensional kinematics to estimate net forces and rotational torques, and a photoelastic technique to estimate single-leg ground-reaction forces during turning. Stride frequencies and duty factors did not differ among legs during turning. The inside legs ended their steps closer to the body than during straight-ahead running, suggesting that they contributed to turning the body. However, the inside legs did not contribute forces or torques to turning the body, but actively pushed against the turn. Legs farther from the center of rotation on the outside of the turn contributed the majority of force and torque impulse which caused the body to turn. The dynamics of turning could not be predicted from kinematic measurements alone. To interpret the single-leg forces observed during turning, we have developed a general model that relates leg force production and leg position to turning performance. The model predicts that all legs could turn the body. Front legs can contribute most effectively to turning by producing forces nearly perpendicular to the heading, whereas middle and hind legs must produce additional force parallel to the heading. The force production necessary to turn required only minor alterations in the force hexapods generate during dynamically stable, straight-ahead locomotion. A consideration of maneuverability in the horizontal plane revealed that a sprawled-postured, hexapodal body design may provide exceptional performance with simplified control.

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