scholarly journals DEM Simulation Based on Experimental Testing

10.5772/63889 ◽  
2016 ◽  
Author(s):  
Šarunas Skuodis
Keyword(s):  
Experimental Testing ◽  
Dem Simulation ◽  
Simulation Based

STUDY ON MECHANISM OF ROCK FALL AT TUNNEL CUTTING FACE AFTER BLASTING

2017 ◽  
Vol 4 (1) ◽  
Author(s):  
Fumi Sato ◽  
Naotaka Kikkawa ◽  
Nobutaka Hiraoka ◽  
Kazuya Itoh ◽  
Naoaki Suemasa
Keyword(s):  
Crack Opening ◽  
Experimental Tests ◽  
Rock Fall ◽  
Tunnel Construction ◽  
Rock Falls ◽  
Dem Simulation ◽  
Tensile Stresses ◽  
Simulation Based ◽  
Small Cracks ◽  
Gas Expansion

There are around 10 casualties due to rock-fall at cutting face annually in conventional tunnel construction in Japan. As from the analysis conducted on the cases involving such casualties, workers were either killed or seriously injured when they works in front of or near the cutting face. For the purpose of evaluating the mechanism of rock fall at tunnel cutting face, this paper performed experimental tests which involved blasting to excavate a model ground of tunnel cutting face, and then analyzed the stress state which is in the cutting face by using Discrete Element Method (DEM) simulation. Based on the results, the tensile stresses remained even when the action of gas expansion due to blasting has completed. Therefore, it is suggested that rock falls might be induced because of the residual tensile stresses. The tensile stresses would gradually open small cracks between rocks and then rocks may suddenly fall after sufficient crack opening due to gravity.

scholarly journals DEM Simulation Based on Scaling Rule

2018 ◽  
Vol 55 (2) ◽  
pp. 95-103 ◽  
Author(s):  
Mikio Yamanoi ◽  
Yoichi Nakata
Keyword(s):  
Dem Simulation ◽  
Simulation Based ◽  
Scaling Rule

A Study on Vibration-Induced Fretting Degradation in Connector Systems

2009 ◽  
Author(s):  
Chen Chen ◽  
George T. Flowers ◽  
Michael Bozack ◽  
Jeffrey Suhling
Keyword(s):  
Experimental Testing ◽  
Parallel Simulation ◽  
Relative Influence ◽  
Actual Application ◽  
Simulation Based ◽  
Design Factors ◽  
D Model ◽  
System Characteristics ◽  
Design And Application ◽  
Modeling Study

Vibration-induced fretting degradation is widely known as a major problem for electrical connectors. At present, much of the evaluation of fretting propensity for particular connector designs and the influence of variations in those designs on fretting performance is conducted through exhaustive experimental testing. Therefore, a simulation based method to predict the influence of various design factors would be beneficial to those responsible for connector design and application. In the authors’ previous work, a combined experimental and modeling study of vibration-induced fretting degradation was conducted for a single blade/receptacle connector pair. However, in actual application, multiple pin connector system are typically used. Thus, studying a complete connector system is an appropriate next step in investigating the relative influence of connector system characteristics on fretting degradation. In this study, a simplified 2-D model was developed using ABAQUS. A series of parallel simulation and corresponding experiments were performance. Good correlation between the experimentally observed results and those predicted by the models was observed.

scholarly journals Delay-Tolerant, Low-Power Protocols for Large Security-Critical Wireless Sensor Networks

2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Claudio S. Malavenda ◽  
F. Menichelli ◽  
M. Olivieri
Keyword(s):  
Low Power ◽  
Experimental Testing ◽  
Wireless Sensor ◽  
Wireless Sensor Node ◽  
Energy Aware ◽  
Security Applications ◽  
Simulation Based ◽  
Wireless Medium ◽  
Sensor Networking ◽  
Delay Tolerant

This paper reports the analysis, implementation, and experimental testing of a delay-tolerant and energy-aware protocol for a wireless sensor node, oriented to security applications. The solution proposed takes advantages from different domains considering as a guideline the low power consumption and facing the problems of seamless and lossy connectivity offered by the wireless medium along with very limited resources offered by a wireless network node. The paper is organized as follows: first we give an overview on delay-tolerant wireless sensor networking (DTN); then we perform a simulation-based comparative analysis of state-of-the-art DTN approaches and illustrate the improvement offered by the proposed protocol; finally we present experimental data gathered from the implementation of the proposed protocol on a proprietary hardware node.

scholarly journals Effectiveness of a Snowboarding Simulation Using the Distinct Element Method

Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 101
Author(s):  
Tatsuya Yoshida ◽  
Shogo Nakamura ◽  
Fumiyasu Kuratani
Keyword(s):  
Granular Material ◽  
Distinct Element ◽  
Simulation Method ◽  
Distinct Element Method ◽  
Simulation Methods ◽  
Test Results ◽  
Dem Simulation ◽  
Simulation Based ◽  
Different Shapes ◽  
Element Method

Some snowboarding simulation methods have been developed. Although snow has unique properties such as granular material and continuum, few snowboard simulation methods can reproduce the discrete behavior of snow. Conventional simulations are unsuitable for reproducing the characteristics of snow when ski and snowboard turns carve through snow and create grooves in it with their edges. We developed a snowboarding simulation based on the distinct element method (DEM) to reproduce the characteristics of snow and compare the results of the developed method with those of a conventional simulation method. The developed simulation was validated by comparing with the results of an experiment involving a few miniature snowboards of different shapes and a pseudo-snow slope. The turn trajectory and board posture predicted by the DEM simulation were closer to the test results than those predicted by the conventional simulation.

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