• VERTICAL AXIS WIND TURBINE MECHANICAL PROJECT

    Some vertical axis windmills have even been equipped with hinged blades to avoid the stresses at high wind speeds. Some windmills, like the cycloturbine, have been equipped with a vane that senses wind direction and causes the rotor to rotate into the wind. Wind turbine generators have been equipped with gearboxes to control [shaft] speeds. Wind turbines have also been equipped with ...

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  • Design and Performance of Vertical Shafts

    Design and Performance of Vertical Shafts . Wong and Kaiser . 7th Annual Canadian Tunnelling Conference of TAC, Edmonton, 1988 . Abstract: Ground deformations around axisymmetric shafts cannot be determined with the currently available nonnumerical design methods which are mostly based on limit equilibrium models.

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  • Distribution of Active Earth Pressure on Vertical Shafts

    Distribution of Active Earth Pressure on Vertical Shafts Tatiana Tobar, Graduate Student Department of Civil Engineering Applied Mechanics, McGill University Montreal, Quebec, Canada Mohamed Meguid, Assistant Professor Department of Civil Engineering Applied Mechanics, McGill University, Montreal, Quebec, Canada ABSTRACT This study describes the experimental program that has been .

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  • Modeling and Simulation of Thermodynamic Processes of ...

    Abstract—A computational fluid dynamics (CFD) modeling and simulation of thermodynamic processes of vertical shaft kiln used for producing deadburned magnesia is presented. The model developed is a 2D steady state model. The combustion, particlegas dynamics and heat transfer processes which occur inside a vertical shaft kiln are modeled by Eulerian multiphase model, and Species transport ...

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  • Vertical Shaft Support Improvement Studies by Strata ...

     · Abstract. The shaft lining failure which occurs in deep alluvium is a sudden coal mine hazard. The strata grouting is one of the treatment methods for the shaft lining failure. To investigate the impact of grout injection pressure on the shaft lining, the field measurement and the numerical analysis of the shaft lining stress variation during the grouting were conducted. To improve the strata ...

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  • Simulating Seepage into Mine Shafts and Tunnels with ...

     · Numerical simulations conducted for individual UMWs, such as a vertical shaft or a horizontal drift, showed that accurate prediction of seepage rates can be achieved by either applying grid spacing that is much finer than the diameter/width of the simulated openings (explicit modeling) or using coarser grid with cell sizes exceeding the characteristic width of shafts or drifts by a factor of 3 ...

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  • Root cause failure analysis of coal mill vertical shaft

    Abstract [en] A root cause failure analysis of coal mill vertical shaft used in thermal power plant has been carried out. The failed parts of the shaft showed the signature of fatigue failures. The fatigue cracks originated from the top edge of the keyway area, where the bowl is assembled. Operating conditions, material of the shaft and design of the shaft for strength are the possible causes ...

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  • Deformation Failure Mechanism of Deep Vertical Shaft in ...

    Vertical shafts play an important role in the safe operation of mines. The stability of vertical shafts has always been a difficult problem in mining engineering, especially with the increasing of mining depth. In order to keep the engineering works stable, it is necessary to make the deformation failure mechanism of vertical shafts clear. This paper describes a case study of the deformation ...

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  • Alan Watt: Vertical Shaft

    Shaft is a small ceramic work of art created by a black fired earthenware technique. The gold shaft is created using gold leaf. The work was created in 1995 and was originally exhibited as as part of the 'Geomorphic' exhibition at the Narek Galleries. Partly abstract, the work imitates the nature of geological environment. It can also be seen as a statement on Australian mining activities of ...

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  • FALLING BODIES IN THE DEEP VERTICAL SHAFTS OF THE

    corrections, may be an earlier draft and/or notes for McNair's earlier talk to the AAAS, the abstract of which appears in Science XXIII, 415416 (1906). FALLING BODIES IN THE DEEP VERTICAL SHAFTS OF THE LAKE SUPERIOR COPPER DISTRICT The mystery of the dark has always hung over caverns, whether of nature's excavation or of the digging of venturesome man. Especially is this so as they .

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  • Underground Mining Transportation Systems

    Figure 1 shows a vertical shaft at Ikeshima Colliery, Japan. The winder is a multirope friction type and automatically operated. Figure 1: Vertical shaft at Ikeshima Colliery Cage The prime function of a cage is the transport of persons and materials to and from . UNESCO – EOLSS SAMPLE CHAPTERS CIVIL ENGINEERING – Vol. II Underground Mining Transportation Systems K. Matsui ...

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  • UPTHRUST PROBLEMS ON MULTISTAGE VERTICAL TURBINE PUMPS

    ABSTRACT Vertical turbine pumps aredesigned to operate with the pump shafts in tension (downthrust). Most pump and motor manufacturers caution users to not operate the vertical turbine pumps at conditions that result in "upthrust." Upthrust conditions are usually encountered for a few seconds each time the pump is started; however, the pump should not be operated for periods longer .

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  • SAND837068, 'Lining Considerations for a Circular ...

    VERTICAL SHAFT IN GENERIC TUFF by William Hustrulid for Sandia National Laboratories Box 5800 Albuquerque, New Mexico 87185 Under Sandia Contract: 501555 Sandia Contract Monitor G. Kenton Beall Geotechnical Design Division ABSTRACT This report summarizes some of the classical formulas used in the design of concrete linings for vertical, circular bored shafts and applies them to .

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  • VERTICAL ELLIPTICAL ACCESSSHAFTS Geometrical optimisation ...

    Mater Dertato n Geotechnical Engineering Report TVGT5068 SANDSTRÖM and BJÖRN ELFVING VERTICAL ELLIPTICAL ACCESSSHAFTS Geometrical optimisation through FEmodelling

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  • Deformation Failure Mechanism of Deep Vertical Shaft in ...

    Abstract: Vertical shafts play an important role in the safe operation of mines. The stability of vertical shafts has always been a difficult problem in mining engineering, especially with the increasing of mining depth. In order to keep the engineering works stable, it is necessary to make the deformation failure mechanism of vertical shafts clear. This paper describes a case study of the ...

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