scholarly journals DEM Simulation Based on Experimental Testing

Author(s):  
Šarunas Skuodis
Author(s):  
Fumi Sato ◽  
Naotaka Kikkawa ◽  
Nobutaka Hiraoka ◽  
Kazuya Itoh ◽  
Naoaki Suemasa

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.


2018 ◽  
Vol 55 (2) ◽  
pp. 95-103 ◽  
Author(s):  
Mikio Yamanoi ◽  
Yoichi Nakata

Author(s):  
Chen Chen ◽  
George T. Flowers ◽  
Michael Bozack ◽  
Jeffrey Suhling

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.


2012 ◽  
Vol 2012 ◽  
pp. 1-10 ◽  
Author(s):  
Claudio S. Malavenda ◽  
F. Menichelli ◽  
M. Olivieri

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.


Proceedings ◽  
2020 ◽  
Vol 49 (1) ◽  
pp. 101
Author(s):  
Tatsuya Yoshida ◽  
Shogo Nakamura ◽  
Fumiyasu Kuratani

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.


Sign in / Sign up

Export Citation Format

Share Document