Theoretical modelling, analysis and validation of the shaft motion and dynamic forces during rotor–stator contact

2013 ◽  
Vol 332 (24) ◽  
pp. 6359-6376 ◽  
Author(s):  
Said Lahriri ◽  
Ilmar F. Santos
Keyword(s):  
Theoretical Modelling ◽  
Modelling Analysis ◽  
Dynamic Forces

scholarly journals Theoretical Modelling Analysis on Tensile Properties of Bioepoxy/Clay Nanocomposites Using Epoxidised Soybean Oils

2019 ◽  
Vol 2019 ◽  
pp. 1-20 ◽  
Author(s):  
Haipan Salam ◽  
Yu Dong
Keyword(s):  
Experimental Data ◽  
Soybean Oil ◽  
Tensile Properties ◽  
Elastic Moduli ◽  
Clay Content ◽  
Theoretical Modelling ◽  
Clay Nanocomposites ◽  
Random Orientation ◽  
Modelling Framework ◽  
Modelling Analysis

A theoretical modelling framework was proposed to predict tensile moduli and tensile strengths of bioepoxy/clay nanocomposites in terms of clay content and epoxidised soybean oil (ESO) content, which could be influenced by properties of blended matrices in nanocomposites, clay filler type, orientation and dispersion status, clay morphological structures, and filler-matrix interfacial bonding. The random orientation of dispersed clay fillers played a significant role in predicting elastic moduli of bioepoxy/clay nanocomposites at clay contents of 1-8 wt% (ESO content: 20 wt%) according to Hui-Shia (H-S) laminate model and Halpin-Tsai (H-T) laminate model. In addition, when clay content was fixed at 5 wt%, H-S laminate model coincided well with the experimental data of bioepoxy/clay nanocomposites at the ESO contents of 0-40 wt%. Whereas, Hirsch model showed closer estimated values with experimental data at the ESO content of 60 wt%. Finally, Turcsányi-Pukànszky-Tüdõs (T-P-T) model predicted better tensile strengths of bioepoxy/clay nanocomposites at clay contents of 1-5 wt% (ESO content: 20 wt%) and at an ESO content of 20-60 wt% (clay content: 5 wt%).

Static and Dynamic Experimental Stress-Strain Analysis of Axles Loaded by Rotation Bending

2015 ◽  
Vol 732 ◽  
pp. 175-178
Author(s):  
Ivo Černý ◽  
Martin Čipera
Keyword(s):  
Fatigue Strength ◽  
High Precision ◽  
Fatigue Testing ◽  
Strain Analysis ◽  
Fatigue Tests ◽  
Theoretical Modelling ◽  
Strength Design ◽  
Dynamic Forces ◽  
Full Scale Tests ◽  
Very High

Safety assessment of railway axles is based on fatigue strength design. During the design overall lifetime, railway axles undergo a very high number of loading cycles under rotating bending. Due to safety and reliability reasons, fatigue strength design has to be very carefully evaluated. Both theoretical modelling and extensive experimental fatigue testing including full scale tests have to be performed, whereas such tests have to be performed correctly with a high precision. In the paper, problems of dynamic forces during fatigue tests of railway axles are pointed out. Though static calibration can be carried out with a very high precision, dynamic forces can cause a significant redistribution of static stresses along the axle. An example is given and discussed.

A Dynamic Modelling Technique for the XJ40 Body Structure Design

1986 ◽  
Vol 200 (5) ◽  
pp. s67-s70
Author(s):  
A M Brown ◽  
J W Dunn
Keyword(s):  
Structural Dynamics ◽  
Dynamic Modelling ◽  
Structure Design ◽  
Modelling Technique ◽  
Theoretical Modelling ◽  
Body Structure ◽  
Noise And Vibration ◽  
Modelling Analysis

This paper combines the principles of quantitative structural dynamics standards with a theoretical modelling analysis, and applies it to the Jaguar XJ40 body structure design. This work has resulted in high levels of vehicle refinement in terms of noise and vibration transmitted to the occupant in the complete car.

Some Problems in Understanding the Solar Corona

1994 ◽  
Vol 144 ◽  
pp. 1-9
Author(s):  
A. H. Gabriel
Keyword(s):  
Solar Corona ◽  
Solar Atmosphere ◽  
Theoretical Modelling ◽  
Total System ◽  
Major Advance ◽  
X Ray ◽  
Proper Perspective ◽  
Space Observations

The development of the physics of the solar atmosphere during the last 50 years has been greatly influenced by the increasing capability of observations made from space. Access to images and spectra of the hotter plasma in the UV, XUV and X-ray regions provided a major advance over the few coronal forbidden lines seen in the visible and enabled the cooler chromospheric and photospheric plasma to be seen in its proper perspective, as part of a total system. In this way space observations have stimulated new and important advances, not only in space but also in ground-based observations and theoretical modelling, so that today we find a well-balanced harmony between the three techniques.

Interlaboratory evaluation of theoretical modelling techniques for single-mode optical fibres

1992 ◽  
Vol 139 (5) ◽  
pp. 353 ◽  
Author(s):  
J. Pelayo ◽  
J. Paniello ◽  
N. Gisin ◽  
J.W. Burgmeijer ◽  
M. Blondel ◽  
...  
Keyword(s):  
Single Mode ◽  
Theoretical Modelling ◽  
Optical Fibres ◽  
Modelling Techniques

Simulation Model of the Dynamic Behavior of a Tire Running Over an Obstacle

1988 ◽  
Vol 16 (2) ◽  
pp. 62-77 ◽  
Author(s):  
P. Bandel ◽  
C. Monguzzi
Keyword(s):  
Simulation Model ◽  
Dynamic Behavior ◽  
Black Box ◽  
Box Model ◽  
Vehicle Suspension ◽  
Empirical Relationships ◽  
Static Tests ◽  
High Speeds ◽  
Dynamic Forces ◽  
Vehicle Suspension System

Abstract A “black box” model is described for simulating the dynamic forces transmitted to the vehicle hub by a tire running over an obstacle at high speeds. The tire is reduced to a damped one-degree-of-freedom oscillating system. The five parameters required can be obtained from a test at a given speed. The model input is composed of a series of empirical relationships between the obstacle dimensions and the displacement of the oscillating system. These relationships can be derived from a small number of static tests or by means of static models of the tire itself. The model can constitute the first part of a broader model for description of the tire and vehicle suspension system, as well as indicating the influence of tire parameters on dynamic behavior at low and medium frequencies (0–150 Hz).

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