The dynamic tensile failure of rock is a main mode in deep underground engineering projects. microscopic mechanism analysis this plays key role disaster warning. Moment tensor inversion very well-known method used to analyze mechanisms. However, an acoustic emission (AE) event cannot be accurately distinguished experiments at the laboratory scale, because there are hundreds AE events generated ...

In this paper the Discrete Element Model (DEM) ‘ESyS_Particle’, previously used to model fracture of brittle rocks and earthquake processes, is further developed to be able to be applied to the hydraulic fracturing process in Engineered Geothermal Systems (EGS). The advantage of DEM is that large deformations and dynamic process can be modelled easily. ESyS_Particle has been used to successfull...

The paper presents the results of an experimental and numerical analysis aimed to clarify some aspects regarding the impact of a granular flow on structures. The experimental set-up comprises a flume equipped with a system of differently sized model obstacles, which are placed along the run-out trajectory to measure the impact force. The soil used for the small-scale model is a mono-granular me...

Dieser Beitrag beschreibt die Entwicklung einer simultanen Regelung von Ladedruck und Abgasrückführrate für Nutzfahrzeug-Dieselmotoren [9]. Für die Regelung wird ein modellgestütztes prädiktives Verfahren eingesetzt. Im Rahmen des von der Europäischen Gemeinschaft geförderten Projektes ,,ATECS” (Advanced Truck Engine Control System) wurden als Entwicklungsumgebung nichtlineare Simulationsmodell...

The in-situ tests have been widely used to directly assess the strength and deformability of rock mass, along with which, various numerical approaches were proposed to give rational interpretations to the mechanical phenomenon happening during these tests. In this study, the so-called potential cracks are introduced into DEM model, leading to expanded DEM (EDEM) approach which is capable of sim...

Spatial decision support systems (SDSS) are designed to make complex resource allocation problems more transparent and to support the design and evaluation of allocation plans. Recent developments in this field focus on the design of allocation plans using optimization techniques. In this paper we analyze how uncertainty in spatial (input) data propagates through, and affects the results of, an...

Vorgestellt wird ein Ansatz zur objektorientierten Modellierung, Simulation und Animation von Informationssystemen. Es wird ein Vorgehensmodell dargestellt, mit dem unter Verwendung des beschriebenen Ansatzes Anforderungsoder Systemspezifikationen von Rechnergestützten Informationssystemen erstellt werden können. Der Ansatz basiert auf einem Metamodell zur Beschreibung Rechnergestützter Informa...

Granular materials in a split-bottom ring shear cell geometry show wide shear bands under slow, quasi-static deformation. From discrete element simulations (DEM), continuum fields like the deformation gradient and stress can be computed with the goal to formulate objective constitutive relations for the flow behavior. From a single simulation only, by applying timeand (local) space-averaging, y...

Das Verhalten eines mobilen Systems wird bestimmt durch seine Architektur (statische und dynamische Anteile, Softwareverteilung), die zu Grunde liegende Netzwerkinfrastruktur (Topologie, Parameter wie Bandbreiten oder Latenzzeiten) und Interaktionen der Benutzer mit dem System. Um bereits zur Entwurfszeit zu bestimmen, ob ein mobiles System nichtfunktionale Anforderungen wie Antwortzeiten oder ...