Coupling one-dimensional recharge solution to analytic element model: an approach for coastal aquifers in Brazil

2004 ◽  
pp. 405-414
Author(s):  
E. Wendland ◽  
J.A.N. Batista ◽  
H.E. Schulz
Keyword(s):  
Coastal Aquifers ◽  
Element Model ◽  
One Dimensional ◽  
Analytic Element

Impact and Bandgap Characteristics of Periodic Rods With Viscoelastic Inserts and Local Resonators

2020 ◽  
Vol 143 (4) ◽  
Author(s):  
Y. Alsaffar ◽  
O. Aldraihem ◽  
A. Baz
Keyword(s):  
Finite Element ◽  
Impact Loading ◽  
Complex Modulus ◽  
Structural Response ◽  
Element Model ◽  
One Dimensional ◽  
Theoretical Predictions ◽  
Finite Element Package ◽  
Viscoelastic Composites ◽  
First Time

Abstract A comprehensive theoretical and experimental study is presented of the bandgap behavior of periodic viscoelastic material (VEM) composites subjected to impact loading. The composites under consideration consist of an assembly of aluminum sections integrated with periodic inserts which are arranged in one-dimensional configurations. The investigated inserts are manufactured either from VEM only or VEM with local resonators (LR). A finite element model (FEM) is developed to predict the dynamics of this class of VEM composites by integrating the dynamics of the solid aluminum sections with those of VEM using the Golla-Hughes-Mctavish (GHM) mini-oscillator approach. The integrated model enables, for the first time, the accurate predictions of the bandgap characteristics of periodic viscoelastic composites unlike previous studies where the viscoelastic damping is modeled using the complex modulus approach with storage modulus and loss factor are assumed constants and independent of the frequency or the unrealistic and physically inaccurate Kelvin–Voigt viscous-damping models. The predictions of the developed FEM are validated against the predictions of the commercial finite element package ansys. Furthermore, the FEM predictions are checked experimentally using prototypes of the VEM composites with VEM and VEM/LR inserts. Comparisons are also established against the behavior of plain aluminum rods in an attempt to demonstrate the effectiveness of the proposed class of composites in mitigation of the structural response under impact loading. Close agreements are demonstrated between the theoretical predictions and the obtained experimental results.

Microfluidic Cell Heating Characterized by 3-ω Measurements

2008 ◽  
Author(s):  
Thomas Barilero ◽  
Thomas Le Saux ◽  
Ludovic Julien ◽  
Vincent Croquette ◽  
Pierre-Olivier Chapuis ◽  
...  
Keyword(s):  
Tin Oxide ◽  
Indium Tin Oxide ◽  
Ion Beam ◽  
Element Model ◽  
Heat Diffusion ◽  
Dimensional Model ◽  
Ion Beam Etching ◽  
3Ω Method ◽  
One Dimensional ◽  
Microfluidic Chamber

Ion beam etching (IBE) was used to microfabricate resistive heaters in indium-tin-oxide (ITO). The device was then closed with a microfluidic chamber and its thermal behavior was investigated using the 3ω method. Experiments and finite element model (FEM) simulations both satisfactorily agreed with a simple one-dimensional model for heat diffusion.

The Calculation of the Rotor Critical Speed of Turbopump

2012 ◽  
Vol 529 ◽  
pp. 220-223 ◽  
Author(s):  
Jun Feng Wang ◽  
Kang Sun
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Critical Speed ◽  
Element Model ◽  
Rotor Dynamics ◽  
Gyroscopic Effect ◽  
One Dimensional ◽  
Dimensional Finite Element ◽  
Shearing Deformation ◽  
Rotor Structure

With the rotor structure ofturbopump, using a one-dimensional finite element method, considering the mass of shaft, gyroscopic effect and influence of shearing deformation,establishedtheone-dimensional rotor dynamics finite element model, calculated its six rank of the critical speed, and compared the gyroscopic effect and mass of shaft to the influence of the critical speed turbopump, and the results show that, considering the mass of shaft there is a slight decrease of critical speed value, and gyroscopic effect on critical speed calculation has a significant effect, therefore, gyroscopic effect must be considered in the design of turbopumps.

DISPLACEMENT OF MONOLITHIC RUBBLE-MOUND BREAKWATER CROWN-WALLS

2012 ◽  
Vol 1 (33) ◽  
pp. 7
Author(s):  
Jørgen Quvang Harck Nørgaard ◽  
Lars Vabbersgaard Andersen ◽  
Thomas Lykke Andersen ◽  
Hans F. Burcharth
Keyword(s):  
Sea Water ◽  
Practical Importance ◽  
Element Model ◽  
Wave Loads ◽  
Wave Load ◽  
One Dimensional ◽  
Physical Model Tests ◽  
Total Failure ◽  
Rubble Mound ◽  
Sliding Distance

This paper evaluates the validity of a simple one-dimensional dynamic analysis as well as a Finite-Element model to determine the sliding of a rubble-mound breakwater crown-wall. The evaluation is based on a case example with real wave load time-series and displacements measured from two-dimensional physical model tests. The outcome is a more reliable evaluation of the applicability of simple dynamic calculations for the estimation of displacement of rubble-mound superstructures. The case example clearly demonstrates that a simplified one-dimensional sliding model provides a safe estimate of the accumulated sliding distance of crown-wall superstructures, which is in contrast to findings from previous similar studies on caisson breakwaters. The calculated sliding distance is approximately three times larger than the measured one when using the original one-dimensional model suggested in previous studies on caisson breakwaters, but correction terms are suggested in the present paper to obtain almost equal measured and estimated displacements. This is of great practical importance since many existing rubble-mound crown-walls are subjected to increasing wave loads due to rising sea water level from climate changes. Reliable and safe estimates are needed to determine whether displacements of crown wall superstructures during extreme situations would be acceptable or whether they lead to total failure of the structures.

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