Rotor-Dynamic Characteristic Evaluation of Generator Geothermal Power Plant Using Finite Element Method

2014 ◽  
Vol 664 ◽  
pp. 170-174 ◽  
Author(s):  
Imam Djunaedi ◽  
Hilman Syaeful Alam ◽  
Aditya Sukma Nugraha
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Power Plant ◽  
Rotational Speed ◽  
Critical Speed ◽  
Rotational Velocity ◽  
Operating Speed ◽  
Geothermal Power Plant ◽  
Geothermal Power ◽  
Element Method

Dynamic characteristics of a critical speed of the rotor components at generator geothermal power plant is evaluated using finite element method. In this study, the critical speed is evaluated based on the over speed scenario at 100%, 120% and 150% of rated speed. The critical speed of the rotor is investigated in the Campbell diagram, which shows the relationship between natural frequency and rotational velocity of the system. Based on the rotordynamic evaluation using finite element, the critical speed at 100% and 120% of the operating speed occurs in the rotational speed of 2750 and 2837 rpm, while at 150%, the critical rotation occurs in the rotational speed of 2750, 2762 and 4051 rpm. It can be concluded that the speed ranges are the critical speed or the resonance region which can be as a direct cause of the component damage, therefore the operating speed should not work too long on that critical speed.

Structural design of high-speed rolling bearing test rig spindle with cantilever

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Hui Li ◽  
Hao Li ◽  
Rongfeng Zhang ◽  
Yi Liu ◽  
Shemiao Qi ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Critical Speed ◽  
Testing Machine ◽  
Structure Design ◽  
Installation Space ◽  
The Finite Element Method ◽  
Content Type ◽  
First Order ◽  
Element Method

Purpose The purpose of this paper is to introduce the structure design process of the cantilever spindle with limited installation space and wishing to increase its critical speed. Design/methodology/approach In this paper, the finite element method was used to analyze the influence of the supporting stiffness and the structure of the spindle on the critical speed, and then the structure of the spindle was designed; moreover, the experiment was accomplished and the experiment results show that the spindle can work stably. Findings Through analyzing the influence of the supporting stiffness and the structure of the spindle on the critical speed, the following conclusions could be obtained: the shape of the first-mode is the bend vibration of the cantilever of the spindle; the first-order critical speed of the spindle gradually decreases with the diameter and length of the cantilever increasing; the first-order critical speed of the spindle increases with the depth and diameter of the blind hole increasing; and the experiment was accomplished and the experiment results show that the spindle can work stably. Originality/value In this paper, the finite element method was used to design the spindle of the testing machine, and satisfactory results were obtained. It can provide a theoretical reference for the design of a similar spindle.

Geometry Investigation of L.R.S. Synchronous Machines Using FEM

2014 ◽  
Vol 792 ◽  
pp. 266-271
Author(s):  
Angelos P. Moschoudis ◽  
Miltiades C. Filippou ◽  
George J. Tsekouras ◽  
Antonios G. Kladas
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Rotational Speed ◽  
Electric Propulsion ◽  
Design Procedure ◽  
Synchronous Motor ◽  
Synchronous Machines ◽  
Salient Pole ◽  
Scale Design ◽  
Element Method

In this paper a geometry investigation of low rotational speed synchronous machines using finite element method is presented. The abovementioned investigation is accomplished using a two step design procedure for salient poles synchronous machines, while a respective example which will be shown synoptically is an under scale design of a low rotational salient pole synchronous motor connected to a ships propeller axis directly.Keywords: Geometry investigation, ships electric propulsion, finite element method, synchronous motor.

scholarly journals Contact Stress Analysis of Spur Gear Under the Different Rotational Speed by Theoretical and Finite Element Method

2018 ◽  
Vol 7 (4) ◽  
pp. 213 ◽  
Author(s):  
Jwan Kh. Mohammed ◽  
Younis Kh. Khdir ◽  
Safeen Y. Kasab
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Dynamic Analysis ◽  
Stress Analysis ◽  
Contact Stress ◽  
Rotational Speed ◽  
Three Dimensional ◽  
Spur Gear ◽  
Percentage Error ◽  
Element Method

In this study that spur gears are chosen, contact stress of spur gear is presented under the effect of rotational speed. Three-dimensional simulation of dynamic analysis of gears designed and modeled using ANSYS software. The dynamic analysis included in the determination of dynamic stresses analysis. Contact stress is theoretically calculated and analyzed and numerically estimated using both Hertzian mathematical model and finite element method respectively. Different values of rotational speed used to study its effect on contact stress. Both methods compared by evaluating the percentage error of contact stress, and the modeling of the spur gear and stress analysis of spur gear carried out using SOLID WORK and ANSYS V14, respectively. The most significant note in this study concludes that increasing speed causes vibration and pitting failure due to repetitions.

scholarly journals Galerkin finite element analysis of magneto two-phase nanofluid flowing in double wavy enclosure comprehending an adiabatic rotating cylinder

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Wael Al-Kouz ◽  
Bilal Abdel-Illah Bendrer ◽  
Abderrahmane Aissa ◽  
Ahmad Almuhtady ◽  
Wasim Jamshed ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Finite Element Method ◽  
Finite Element ◽  
Transfer Process ◽  
Rotational Velocity ◽  
Heat Transfer Process ◽  
Two Phase ◽  
Galerkin Finite Element ◽  
Computational Calculations ◽  
Element Method

AbstractIn this work, the finite element method is employed to simulate heat transfer and irreversibilities in a mixed convection two-phase flow through a wavy enclosure filled with water–alumina nanoliquid and contains a rotating solid cylinder in the presence of a uniform magnetic field. Impact of the variations of undulations number (0 ≤ N ≤ 5), Ra (103 ≤ Ra ≤ 106), Ha (0 ≤ Ha ≤ 100), and angular rotational velocity (− 500 ≤ Ω ≤ 500) were presented. Isotherms distribution, streamlines and isentropic lines are displayed. The governing equations are verified by using the Galerkin Finite Element Method (GFEM). The Nusselt numbers are calculated and displayed graphically for several parametric studies. The computational calculations were carried out using Buongiorno's non-homogeneous model. To illustrate the studied problem, a thorough discussion of the findings was conducted. The results show the enhacement of the maximum value of the flow function and the heat transfer process by increasing the value of Rayleigh number. Furthermore the irreversibility is primarily governed by the heat transfer component and the increment of the waviness of the active surfaces or the cylinder rotational velocity or hartmann number will suppress the fluid motion and hinders the heat transfer process.

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