A Study of Gear Root Strains in a Multi-Stage Planetary Wind Turbine Gear Train Using a Three Dimensional Finite Element/Contact Mechanics Model and Experiments

2011 ◽  
Author(s):  
Phillip E. Prueter ◽  
Robert G. Parker ◽  
Frank Cunliffe
Keyword(s):  
Finite Element ◽  
Wind Turbine ◽  
Contact Mechanics ◽  
Three Dimensional ◽  
Gear Train ◽  
Mechanics Model ◽  
Multi Stage ◽  
Dimensional Finite Element ◽  
Advanced Analysis ◽  
Three Dimensional Finite Element

Wind energy has received a great deal of attention in recent years in part due to its minimal environmental impact and improving efficiency. Increasingly complex wind turbine gear train designs, well-known failures in gear train rolling element bearings, and the constant push to manufacture more reliable, longer lasting systems generate the need for more advanced analysis techniques. The objectives of this paper are to examine the mechanical design of an Orbital2 flexible pin multi-stage planetary wind turbine gear train using a three dimensional finite element/contact mechanics model and to compare to full system experiments. Root strain is calculated at multiple locations across the facewidth of ring gears from the computational model and compared to experimental data. Gear misalignment and carrier eccentricity are also considered. Design recommendations for improving load distribution across gear facewidths are also discussed.

Modeling of Blades as Equivalent Beams for Aeroelastic Analysis

2003 ◽  
Author(s):  
David J. Malcolm ◽  
Daniel L. Laird
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wind Turbine ◽  
Three Dimensional ◽  
Element Model ◽  
Detailed Model ◽  
Stiffness Matrices ◽  
Aeroelastic Analysis ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

A procedure has been developed and tested to derive a set of one-dimensional beam properties that will duplicate the behavior of a full three-dimensional finite element model of a wind turbine blade. This allows the full features of a detailed model to be transferred to an aeroelastic code for dynamic simulation of the complete wind turbine. The process uses the NuMAD interface to generate an ANSYS® finite element model to which a set of six unit loads are applied at the tip. The displacement results are used in a series of MATLAB routines to extract the stiffness matrices of the desired beam elements. Tests have been carried out on a number of blades and the stiffness matrices incorporated into ADAMS® models of the blades and complete wind turbines.

Multi Stage Seaming Process for Large Tubular Mechanical Bonded Structure

2007 ◽  
Vol 340-341 ◽  
pp. 1437-1442
Author(s):  
Yoon Kim ◽  
Dong Woo Kang ◽  
Tae Wan Ku ◽  
Jeong Kim ◽  
Beom Soo Kang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Bonding Strength ◽  
Initial Conditions ◽  
Three Dimensional ◽  
Element Analysis ◽  
Multi Stage ◽  
Bending Process ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element

This study is dedicated to three-dimensional finite element analysis of seaming process, which consists of bending, curling and caulking process, of a large tubular mechanical bonded structure. The seaming process is often used to improve a high bonding strength as avoiding any kind of defect. Finite element simulations of the seaming process were preformed for two different initial conditions with pre-analyzed results and without those from bending process. The mechanical bonding strength of the seamed area in the large tubular structure was estimated and compared through finite element analysis among several different analysis conditions of the bending and the caulking. Tensile test for the specimen extracted from the large tubular mechanical bonded structure was also executed and compared with the results of finite element analysis, in order to verify which initial condition in finite element analysis was suitable for this kind of multi stage seaming process. As a result, the effect on an accuracy of finite element analysis for the multi stage seaming process was evaluated in this study. Finally, it is noted that the pre-analyzed results from bending process should be considered in order to obtain the accurate results from finite element analysis.

On the wind turbine blade loads from an aeroelastic simulation and their transfer to a three-dimensional finite element model of the blade

2019 ◽  
Vol 44 (6) ◽  
pp. 577-595
Author(s):  
Louis-Charles Forcier ◽  
Simon Joncas
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Wind Turbine ◽  
Turbine Blade ◽  
Three Dimensional ◽  
Element Model ◽  
Wind Turbine Blade ◽  
Dimensional Finite Element ◽  
Three Dimensional Finite Element ◽  
Blade Loads

This article first presents a description of the different load types to which a wind turbine blade is subjected. Analytical equations are derived to express blade loads from operation parameters of the wind turbine (rotor and nacelle velocities and accelerations; pitch, coning, tilt, and azimuth angles; blade mass properties; turbine geometry). This allows a better understanding of the contribution of each of these parameters to the total load on a blade. A difficulty arises for transferring the loads computed by an aeroelastic model (a one-dimensional model of the blade) to a three-dimensional finite element model of the blade. A method is proposed for that purpose. It consists in applying the aerodynamic loads using RBE3 elements and applying gravitational and inertial loads as volume forces. Finally, an example of this method used for the design of a 10 kW wind turbine blade is presented.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

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