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It cannot reflect the real situation for analysis of flexible coupling-rotor system if the flexible coupling is viewed as shaft or directly ignored. After carefully analyzing the responses in different speed and different unbalance displacements considering the threaded coupling, the accurate threaded coupling-rotor system is established using finite element method. Meanwhile, the threaded coupling-rotor...
Unbalance forces are a crucial issue in rotor systems. Often it is of interest to monitor the states of unbalances while the rotor is running in order to prevent damages to the rotor system. For the model based unbalance monitoring a rotor model is required to represent the behavior of the rotor system and the influences of the unbalances. The feasibilities of the methods are often limited by the...
Today, in order to fulfill the growing need of electricity, renewable energy has occupied respectable position. Wind energy has become the most promising renewable energy source. Small wind turbine technology is in embryonic stage. The simple, cost effective and reliable small wind turbine system is the need of hour. This work is related to unidirectional co-axial series rotor wind turbine. In this...
The transverse vibration characteristics of rigid rotor-bearing system was studied with the gyroscopic effect taken into consideration which was arosed by unsymmetrical bearings. And its transverse vibration equation considering the gyroscopic moment and fluid force was established. The stability condition for the system's vibration and critical stability rotational speed's concrete expressions were...
The transmission vibration characteristics of the helicopter test stand was analyzed using the transfer matrix method, including the torsional vibration and the lateral vibration. The torsional vibration modal frequencies and the modal shapes of each order were obtained by analyzing the torsional vibration of the rotor test stand transmission; What's more, each order natural frequency and the relationship...
Based on the simple hinge crack model, the dynamic equation of a rotor containing transverse crack and initial deflection is modelled in dimensionless form, which can be applied to the vibration analysis of cracked rotor with different parameters at stationary, transient and nonlinear state. By analytical solution, the frequency components of the cracked rotor with initial deflection are compared...
The gap between the rotor and the stator of the external circulation piston pump has an important impact on pump efficiency and operation reLiabiLity. Shaft and rotor are important parts of the external circulation piston pump. The gap value is determined by the shaft flexural deformation. According to the force of the rotor and shaft, the relevant module of the software ANSYS was appLied to give...
This paper describes a design and implementation of a low power wind turbine. The designed turbine is a Horizontal Axis Wind Turbine (HAWT), meaning that axis of rotation is parallel to the ground. Rotor, blades, supporting hub, and drive train are designed using computational software. Implemented wind turbine was tested and experimental results were obtained for 3.5 m/s to 9 m/s wind speed.
This paper investigates the use of simulations to study wind turbine imbalance faults. The dynamics of a model wind turbine generator (WTG) are simulated in a combined environment of TurbSim, FAST (Fatigue, Aerodynamics, Structures, Turbulence), and Simulink in three different scenarios, i.e., normal operating conditions, blade imbalance, and aerodynamic asymmetry. The blade imbalance is simulated...
Electrical machine standards were dominated by the manufacturers until API 541 RP was created in 1972. Up until the mid 1960's, manufacturers constantly re-designed the electrical parts of the machine without user assistance. Critical motors servicing large pipeline pumps were specified with little or no features. All electrical connection points were mounted inside the enclosure and all key mounting...
The research object of the paper is a rotor in the lubricant pump for steam turbine. It was found in actual using that the gear shaft was frequently abandoned due to the wearing of teeth surfaces Laser cladding is a effective technique for repairing this kind of wearing high-accuracy components due to its potty heat-affected zone and metallurgical combination between cladding coats and base material...
In this paper an IPMSM (Interior Permanent Magnet Synchronous Motor) rotor configuration optimization is proposed in order to increase the performances in terms of torque, limiting at the same time the rotor leakage flux. The final mixed radial and tangential rotor configuration here proposed and described determines a reduction in PM material quantity of about 25% compared to a tangential IPMSM one...
This paper presents the use of simulations to study imbalance faults of wind turbines. The dynamics of a model wind turbine are simulated in three different scenarios, i.e., normal operating conditions, blade imbalance, and aerodynamic asymmetry, using TurbSim and FAST. Blade imbalance is simulated by scaling the mass density of one blade which created an uneven distribution of mass with respect to...
The nonlinear torsional vibration on rotor system driven by universal joint was studied considering both natural structure misalignment and actual error misalignment. Firstly, the equation with weakly nonlinear vibration was derived after analyzing the kinematic relation about driven shaft and driving shaft. Secondly, the periodic solution was obtained corresponding to principal resonance by multi-scale...
Low-frequency torsional resonance arising from large inertia load and elastic shaft causes vibration when industrial servo system is working, which degrades the system's performance of motion control. This paper presents an adjustable inertia ratio control strategy based on designing disturbance observer, which the inertia ratio between the load and rotor is adjusted to an optimal ratio so as to suppress...
The simulation system on the thermal stresses and fatigue life loss of the rotator during startup and shutdown for a domestic 600 MW steam turbo generator unit, By means of the analysis of simulation system on the thermal stress and life loss of the rotor, and we could know that the surface of the shaft was suffered a crushing stress, but it was a pulling stress when a unit shut down. The max thermal...
The simulation system on the thermal stress & fatigue life loss of the rotor during startup & shutdown for a domestic 600 MW steam turbo generator unit, by the simulation, the surface of the shaft was suffered a crushing stress, but it was a pulling stress when a unit shutdown. The max thermal stress & the max combined stress produced on the rotor of a medium pressure cylinder was about...
Rotor is the major work components of vertical shaft impact crusher and tip set extra hard is the most wearing part of it. Based on the analysis of the structure and the working principles of the vertical shaft impact crusher, we set up the three-dimensional model of the rotor in Solid Works. Through the importation of the 3-D model into ADAMS for the dynamic simulation, we simulate the throwing process...
In order to study the influence of slant cracks on rotor's torsional shear stress, the mode III stress intensity factors in different positions of slant crack rotor, with dip angles (the angle between crack surface and axial line) greater than 60 degrees and at different depth ratios of shafting, are analyzed and calculated .The results show that: the stress intensity factor of the same position and...
A spherical stepping motor with a hexahedron based rotor and an octahedron based stator is designed. The motor has a rotor supported by six spherical bearings and a stator. Eight NdFeB permanent magnets are attached at the vertexes of the virtual hexahedron inscribed in the rotor so that the North and the South poles are located alternately. Six iron cores are also attached on the spherical shell...
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