scholarly journals Modelling Bending Stiffness and Vibration Characteristics to Enable Simulation-Driven Ski Design

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 157
Author(s):  
John Borenius ◽  
Henrik Edman ◽  
Albin Lindmark ◽  
Marcus Pålsson ◽  
Thomas Abrahamsson ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Vibration Characteristics ◽  
Trial And Error ◽  
The Past ◽  
Design Changes ◽  
Simulation Based Design ◽  
Simulation Based ◽  
Design Options

When developing alpine skis, new design is often built upon experience from what has been done in the past. This allows for stable but incremental improvements that limit the possibilities of ground-breaking design changes. To allow such major changes, without risking spending a fortune on trial and error studies, simulation-based design is a must. This paper presents a method for such a simulation-based design approach, focusing on the effect of the internal ski structure and its effect on bending and vibration characteristics. As a prototype ski, we have studied Faction Skis’ Candide 3.0, for which a finite element model was developed and validated. In the next step, the effect of a design ski variation was analysed to demonstrate how simulation-based screening of design options can be easily implemented.

Vibration Characteristics of the Vocal Folds

2006 ◽  
Author(s):  
L. Hai ◽  
A. M. Al-Jumaily ◽  
A. Mirnajafi
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Vocal Fold ◽  
Vocal Folds ◽  
Element Model ◽  
Vibration Characteristics ◽  
Transverse Isotropic ◽  
Body Theory ◽  
Oscillation Characteristics ◽  
Vocal Fold Nodules

The vibration characteristics of the vocal folds are investigated using a finite element model which incorporates the in-homogeneity and anisotropy of the materials and the irregularity of the geometry. The model employs the cover and body theory to build the structure of the vocal folds and implements measured viscoelastic properties of the mucosa and the transverse isotropic elastic properties of the muscles. It has the potential to simulate some vocal-fold disorders and determine the change in characteristics. To determine the oscillation characteristics of the folds, the eigenfrequency and eigenmodes of the finite element model are determined using the ABAQUS software. The model results compare well with some experiments performed on a silicon vocal fold. It is anticipated that the model will help to identify voice disorders such as vocal-fold paralysis and vocal-fold nodules.

What have we learned from finite element model studies of lumbar intervertebral discs in the past four decades?

2013 ◽  
Vol 46 (14) ◽  
pp. 2342-2355 ◽  
Author(s):  
Hendrik Schmidt ◽  
Fabio Galbusera ◽  
Antonius Rohlmann ◽  
Aboulfazl Shirazi-Adl
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Element Model ◽  
Intervertebral Discs ◽  
Model Studies ◽  
The Past

Prediction of Modal Characteristics due to Design Change

1997 ◽  
Author(s):  
Tong Y. Yi ◽  
Parviz E. Nikravesh
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Stiffness Matrix ◽  
Element Model ◽  
Vibration Characteristics ◽  
Original Structure ◽  
Design Change ◽  
Modal Data ◽  
Modal Characteristics

Abstract This paper presents a method for predicting modal characteristics of a structure that is considered to undergo a design change. It is assumed that for the original structure the modal data is available either as a complete or as an incomplete set. Based on the available modal data and the known data on the design change, this paper discusses methodologies for determining the vibration characteristics of the modified structure. By considering practical situations, the emphasis of this paper is on structures for which a finite element model, and hence a stiffness matrix, is not available.

Finite element model-simulation-based characterization of a magnetostrictive gyrosensor

2010 ◽  
Vol 107 (9) ◽  
pp. 09E705 ◽  
Author(s):  
U. Marschner ◽  
F. Graham ◽  
C. Mudivarthi ◽  
J.-H. Yoo ◽  
H. Neubert ◽  
...  
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Model Simulation ◽  
Element Model ◽  
Simulation Based ◽  
Finite Element Model Simulation

Torsional Vibrations in Turbogenerators Due to Network Disturbances

1990 ◽  
Vol 112 (3) ◽  
pp. 312-320 ◽  
Author(s):  
P. Schwibinger ◽  
R. Nordmann
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Degrees Of Freedom ◽  
Element Model ◽  
Torsional Vibrations ◽  
The Finite Element Method ◽  
The Past ◽  
Turbine Generators ◽  
The Finite Element Model

Large steam-turbine generators in operation may be stimulated to torsional vibrations by dynamic moments at the generator due to electrical system transients. The induced torsional stresses in the shaft have drawn growing attention over the past few years. To solve the torsional vibration problem the turbogenerator shaft is modelled by the finite element method. This paper presents the results for a 600 MW turbogenerator set. To verify the quality of the used finite element model measurements were carried out and compared with the analytical results. For some applications it is desirable to have a torsional model with a reduced number of degrees of freedom, which reproduces the finite element model only in the lower eigenfrequencies and modes. This paper describes a method on how to find the most accurate reduced torsional model with discrete masses and springs from the finite element model.

The Vibration Characteristics Analysis of U-Shaped Pipe Based on Finite Element and Modal Experiment

2013 ◽  
Vol 427-429 ◽  
pp. 53-56
Author(s):  
Li Zhang ◽  
Ye Tian ◽  
Yan Miao Ma
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Modal Analysis ◽  
Element Model ◽  
Vibration Characteristics ◽  
Experimental Modal Analysis ◽  
Piping System ◽  
Characteristics Analysis ◽  
The Finite Element Model ◽  
Pipe Vibration

The U-shaped pipe located in the compressor piping system of the lyophilizer is studied in this paper. Its finite element modal analysis is carried out through the software ABAQUS, and at the same time, the experimental modal analysis is conducted by the software LMS Test.lab and its corollary equipment. Through the comparison between the finite element modal analysis results and the experimental modal results, it can be seen that the two results have good consistence, which verifies that the finite element model is reasonable. This paper provides reference for the further studies of the curving pipe vibration.

Development and Validation of an LS-DYNA Model for Simulating Vertical Drop Test of a Nuclear Fuel Shipping Package

2010 ◽  
Author(s):  
W. Zhao ◽  
B. Hempy ◽  
J. Liu ◽  
W. Stilwell ◽  
R. Rochow
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Fuel Assembly ◽  
Nuclear Fuel ◽  
Element Model ◽  
Design Changes ◽  
Hypothetical Accident ◽  
Accident Conditions ◽  
Simplified Finite Element Model ◽  
Development And Validation

To meet shipping package safety requirements for transporting fresh nuclear fuel assemblies, structural performance of the shipping package under hypothetical accident conditions must be evaluated and demonstrated to have adequate protection to the fuel assembly it transports. To efficiently evaluate design changes in the shipping package, a simplified finite element model for the shipping package and fuel assembly has been developed using LS-DYNA. The paper describes the development and validation of the finite element model, along with a few design analysis examples to illustrate its usefulness.

Research on Vibration Characteristics of the Three-Bearings Supporting Structure with Cracks in the Rotor of the 25Cr2Ni4MoV Exciter

2019 ◽  
Vol 893 ◽  
pp. 33-38
Author(s):  
Qing Meng Zeng ◽  
Zhi Min Liu ◽  
You Liang Chen ◽  
Fan Yang Meng
Keyword(s):  
Finite Element ◽  
Finite Element Model ◽  
Critical Speed ◽  
Case Analysis ◽  
Element Model ◽  
Vibration Characteristics ◽  
Supporting Structure ◽  
Response Characteristics ◽  
Model Based ◽  
Set Up

Finite element model based on a unit with cracks in the rotor of the exciter is set up. Andthen critical speed is calculated that compared to actual measured value to verify the rationality of themodel. Lastly response characteristics of the three-bearings supporting structure are studied when thefirst critical speed of the exciter with cracks is closed to the working speed. And the reliability ofconclusions is further verified by case analysis.

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