Rotor systems

Xem 1-20 trên 21 kết quả Rotor systems
  • This paper presents the influence coefficient method of determining the locations of unbalances on a flexible rotor system and the correction weights. A computer software for calculating the at-the-site balancing of a flexible rotor systern was created using c++ language at the Hanoi University of Technology. This software can be used by balancing flexible rotors in Vietnam.

    pdf13p chikychiky 26-10-2018 10 1   Download

  • This paper investigates models of Flexible AC Transmission Systems (FACTS) and applications of FACTS devices for improving the rotor angle stability. FACTS devices are applicable in shunt connection Static Var Compensator (SVC), in series connection Thyristor-Controlled Series Capacitor (TCSC), or in the combination of both.

    pdf8p sansan2 26-05-2018 5 1   Download

  • An optimal state feedback controller is then designed in order to directly formulate the performance objectives of the control system and provides the best possible control system for a given set of performance objectives. Zero steady-state error of system outputs is also given by the means of integrators which are added into the system. As a result, MIMO system’s responses achieve quick stabilization and good performances.

    pdf6p blackwidow123 15-06-2018 12 1   Download

  • In this paper, a Model Reference Adaptive Systems (MRAS) based an Adaptive System is proposed to a Twin Rotor MIMO System (TRMS). The TRMS is an open-loop unstable, nonlinear and multi output system.

    pdf6p blackwidow123 15-06-2018 3 1   Download

  • This paper proposes the angle tracking control method for Twin rotor multi-input multipleoutput (TRMS) using the input-to-state stability theory (ISS) for nonlinear systems. To apply this theory, the model of TRMS is rewritten by an Euler-Lagrange forced model with uncertain parameters and input disturbances.

    pdf17p cumeo2009 31-07-2018 2 0   Download

  • In this paper, after analysing deformations of loading ball-bearing it is able to investigate vibrations of rotor-bearing system as the system with non-linear and periodically varying stiffness.

    pdf17p thienthanquydu 21-10-2018 13 0   Download

  • Maintenance costs, as defined by normal plant accounting procedures, are normally a major portion of the total operating costs in most plants. Traditional maintenance costs (i.e., labor and material) in the United States have escalated at a tremendous rate over the past 10 years. In 1981, domestic plants spent more than $600 billion to maintain their critical plant systems. By 1991, the costs had increase to more than $800 billion, and they were projected to top $1.2 trillion by the year 2000.

    pdf425p beobobeo 01-08-2012 89 27   Download

  • Vibration absorption has been a very attractive way of removing oscillations from structures under steady harmonic excitations. There are many common engineering applications yielding such undesired oscillations. Helicopter rotor vibration, unbalanced rotating power shafts, bridges under constant speed traffic can be counted as examples.

    pdf42p goixanh 27-09-2010 33 5   Download

  • Helicopter aerodynamics is the branch of physics dealing with the forces and pressures exerted by air in motion. The atmosphere, the mass of air, which completely envelops the earth, is composed of varying and nonvarying constituents. The nonvarying constituents include oxygen (21%) and nitrogen (78%). The varying constituents include CO2, argon, hydrogen, helium, neon, krypton, and water vapor, which will vary from negligible amounts to approximately 4% by volume (100% relative humidity). Air is a fluid and is affected by changes in temperature, pressure, and humidity....

    pdf80p beobobeo 01-08-2012 37 4   Download

  • (BQ) Part 1 book "Aerodynamics of wind turbines hansen" has contents: General introduction to wind turbines, aerodynamics, momentum theory for an ideal wind turbine, shrouded rotors, the classical blade element momentum method, control regulation and safety systems, optimization.

    pdf95p bautroibinhyen18 23-02-2017 31 3   Download

  • This paper presents the method to design roller mechanism to apply two goals: create a continuous pressure for a regular granulation on steel conveyor. There are also granulation mechanism and maintain temperature not to stuck and solidify of sulfur in the supplying pile.

    pdf7p sansan2 26-05-2018 6 1   Download

  • Mass unbalance and bent shafts both give force excitation at a frequency corresponding to once per revolution. Taking a LP B rotor of a 1000 MW USC steam turbine as an example, this paper studies the lateral vibration of the LP B rotor based on finite element. Responses of mass unbalance and bent shaft are analyzed and compared.

    pdf10p cumeo2009 31-07-2018 10 0   Download

  • This paper has presented an adaptive fuzzy controller for permanent magnet synchronous motor. A rotor speed estimation based on sliding mode observer. Space-vector pulse width modulation was used for slipping frequency vector control system. The simulation architecture of system was implemented on Modelsim and Matlab/Simulink.

    pdf5p praishy2 27-02-2019 0 0   Download

  • Gyroscopic precession is a key factor involved in the concept of operation for the north-seeking gyrocompass, as will be discussed later. Friction in the support bearings, external influences, and small imbalances inherent in the construction of the rotor cause even the best mechanical gyros to drift with time. Typical systems employed in inertial navigation packages by the commercial airline industry may drift about 0.1 during a 6-hour flight [Martin, 1986]. 2.1.

    pdf20p longtuyenthon 27-01-2010 86 25   Download

  • This volume, based on the proceedings of the Sixth International Symposium on Unsteady Aerodynamics, Aeroacoustics and Aeroelasticity of Turbomachines and Propellers aims at promoting an international exchange of current research in unsteady flow phenomena in turbomachines and propellers.

    pdf604p kennybibo 14-07-2012 39 9   Download

  • Contents: Gold East Paper, Dagang – A non-plus-ultra papermaking line, “Stonebridge” – the world’s biggest single-line deinking system in China, Energy efficient HM Rotor – Power saving solution for virgin bale repulping applications, Voith Paper – A perfect partner at any time International Customer Symposium “Graphic Grades”: May 9 to 11, 2006, A vision becomes reality – Online calendering of LWC offset/rotogravure printing grades with high DIP content at LEIPA, Schwedt, Voith keeps customers “...

    pdf76p loixinloi 08-05-2013 50 7   Download

  • (BQ) Part 1 book "Heat-Transfer calculations" has contents: Introductory calculations, steady state calculations (solution for the heat transfer design of a cooled gas turbine airfoil, cooling of a fuel cell, turbo generator rotor cooling calculation,...), transient and cyclic calculations (thermal system transient response, transient analysis of low temperature, low energy carrier,...).

    pdf295p bautroibinhyen19 24-02-2017 11 4   Download

  • Synchronous machines come in a variety of different constructions and designs. The differences occur in the physical outlay of the rotor and in the way in which excitation flux is provided (if it is provided at all) in the machine. Regardless of the type however, all the synchronous machines have the same construction of the stator. Stator is of cylindrical crosssection, manufactured from laminated sheets of steel, and it carries a three-phase winding that is supplied with (in the motor case) or that produces (in the generator case) a system of threephase voltages....

    pdf25p liemthanh 14-12-2009 63 3   Download

  • Finally, electromagnetic bearings involve complex design problems to ensure that the heavy spindle, with its high inertia, does not fall and damage the magnetic bearing when power is shut off or momentarily discontinued. Therefore, a noninterrupted power supply is required to operate the magnetic bearing, even at no load or at shutdown conditions of the system. In order to secure safe operation in case of accidental power failure or support of the rotor during shutdown of the machine, an auxiliary bearing is required. Rolling-element bearings with large clearance are commonly used.

    pdf20p tieulac 29-11-2010 46 3   Download

  • A synchronous machine is an ac rotating machine whose speed under steady state condition is proportional to the frequency of the current in its armature. The magnetic field created by the armature currents rotates at the same speed as that created by the field current on the rotor, which is rotating at the synchronous speed, and a steady torque results. Synchronous machines are commonly used as generators especially for large power systems, such as turbine generators and hydroelectric generators in the grid power supply. ...

    pdf31p bk20062011 21-02-2011 51 3   Download


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