Concept

Crash test

Related publications (19)

Mass lumping and stabilization for immersogeometric analysis

Trimmed (multi-patch) geometries are the state-of-the-art technology in computer-aided design for industrial applications such as automobile crashworthiness. In this context, fast solution techniques extensively rely on explicit time integration schemes in conjunction with mass lumping techniques that substitute the consistent mass with a (usually diagonal) approximation. For smooth isogeometric discretizations, Leidinger (“Explicit isogeometric B-Rep analysis for nonlinear dynamic crash simulations,” Ph.D.

Walter de Gruyter GmbH2026

Boundary approach for solid dynamics in large translation & rotations

High levels of space debris, created by decades of human activity in space, are becoming an increasing threat to astronauts and satellites alike. To tackle this issue, innovative solutions for cleaning space are called for. One company with a promising concept is Clearspace, who propose the use of satellites with claw-like arms that can be used to catch and de-orbit large pieces of debris. Designing such a satellite is highly complex and requires large financial means. To reduce the dependency on expensive

École Polytechnique Fédérale de Lausanne2025

Damage limit states for artistic assets from cyclic and dynamic tests on plastered masonry walls

Recent earthquakes have dramatically demonstrated the consequences of the seismic vulnerability of cultural heritage assets worldwide. Nevertheless, this critical issue still needs to be fully explored, as earthquake engineering efforts have been mostly devoted to structural performance and life safety rather than to non-structural response and damage control in the past. The protection of artistic assets to seismic actions requires the identification of the main damage mechanisms and the definition of prop

2021

Time reversal applied to fault location in power networks: Pilot test results and analyses

Mario Paolone, Zhaoyang Wang, Reza Razzaghi

This paper presents the results of a pilot test performed on a real medium voltage distribution network in Switzerland with the aim of assessing the performance of a fault location system relying on the Electromagnetic Time Reversal (EMTR) method. To the b ...

2020

Packaging technologies for high temperature control electronics

Yusuf Leblebici, Thomas Maeder, Peter Ryser

Current low temperature electronics (175°C) for prolonged periods of time require packaging technologies that have to tackle many new problems. At high temperatures traditionally used materials such as organic circuit boards, adhesives and standard solders degrade rapidly or undergo changes in structure and pro

IMAPS2013

Probing the microscopic strength of alumina reinforcements

Andreas Mortensen, Marco Cantoni, Andreas Rossoll

In this work we develop a methodology to probe the strength and toughness of microscopic brittle phases by combining focused ion beam (FIB) milling methods with microtesting techniques and finite element simulation. We present results from tests conducted on alumina fibres and compare data thus obtained with known macroscopic fibre properties derived from tensile tests conducted on long sections of the fibres. The developed methodology is to be transposed towards the microscopic mechanical testing of irregu

2013

Appraisal of Core Analysis Methods against Zero-Power Experiments on Full-Scale BWR Fuel Assemblies

The present doctoral research aims at the appraisal of nodal core simulators used for the calculation of commercial boiling water reactor (BWR) cores, against measurements carried out at the Paul Scherrer Institute under the LWR-PROTEUS experimental progra ...

EPFL2012

Risk indicators - Unsafe traffic conditions

This study proposes a framework for developing a pro-active system aiming at reducing motorway crash risk based on risk indicators. Although motorways are of safe road type by design, a crash if happens would be really severe. Reducing motorway crash risk would prevent crashes or diminish their severity. To that purpose, risk indicators are tested and validated with real data including traffic data, meteorological data, and crash databases from a study site in Switzerland. A guideline about how to define th

COST Office2009

Nanoparticle Based Tuberculosis Vaccine

Tuberculosis (TB) is a growing world health problem, especially in developing countries. The only available vaccine is the hundred years old Bacille de Calmette et Guérin (BCG). It has been shown to reduce infant mortality, but it is not an effective method for preventing TB in adults. A new vaccine that can safely and effectively be administered in infancy and confers long-term protection against TB is urgently needed. Using a novel nanoparticle (NP) delivery platform developed in the laboratories of Prof.

2008

Nanoparticle based Tuberculosis vaccine

Despite the widespread use of Bacille de Calmette et Guérin (BCG) for over50 years, tuberculosis (TB) continues to be a major global health problem, especially in developing countries. Indeed BCG as been shown to reduce infant mortality, but demonstrated very high variability in preventing TB in adults. There is thus an urgent need for the development of an e-cacious novel TB vaccine that confirms long-term protection in both adult and children. A newnanoparticle (NP) delivery technology was recently develo

2008

A Software/Hardware Platform For Rapid Prototyping of Video and Multimedia Designs

Marco Mattavelli

Traditional design and test of complex multimedia systems involves a large number of test vectors and is a difficult and time-consuming task. The simulation times are prohibitively long on current desktop computers. Driving actual design scenarios and timing burst behavior which produce real-time effects is difficult to do with current simulation environments. This paper describes a rapid emulation framework for accessing multiple hardware IP blocks on an FPGA. This solution involves an abstraction of the F

IEEE2005

A new look at atomic broadcast in the asynchronous crash-recovery model

André Schiper

Atomic broadcast in particular, and group communication in general, have mainly been specified and implemented in a system model where processes do not recover after a crash. The model is called crash-stop. The drawback of this model is its inability to express algorithms that tolerate the crash of a majority of processes. This has led to consider group communication in the so-called crash-recovery model, in which processes have access to stable storage, to log their state periodically. This allows them to

2004

Robust Emulations of Shared Memory in a Crash-Recovery Model

Rachid Guerraoui

A shared memory abstraction can be robustly emulated over an asynchronous message passing system where any process can fail by crashing and possibly recover (crash-recovery model), by having (a) the processes exchange messages to synchronize their read and write operations and (b) log key information on their local stable storage. This paper extends the existing atomicity consistency criterion defined for multi-writer/multi-reader shared memory in a crash-stop model, by providing two new criteria for the cr

2004

An Efficient Universal Construction for Message-Passing Systems

Rachid Guerraoui, Partha Dutta

A universal construction is an algorithm that transforms any object with a sequential specification into a wait-free and linearizable implementation of that object. This paper presents a novel universal construction algorithm for a message-passing system with process crash failures. Our algorithm relies on two fine-grained underlying abstractions: a weak form of leader election, and a one-shot form of register. Our algorithm is \emp{indulgent}, \emp{efficient} and \emp{generic}. Being indulgent intuitively

2002

On the practical use of weld improvement methods

Alain Nussbaumer

Many laboratory studies have shown the beneficial effects of weld improvement methods on the fatigue strength of welded details. However, no structural codes systematically include weld improvement methods in detail classification. The purpose of this paper is to discuss the possibilities of using these methods in practice on either new or existing structures. This paper provides the reader with practical rules for designing and computing the fatigue strength of improved welded joints. A computation method

2001

Modeling and simulation of an impact test using wavelets, analytical solutions and finite elements

Pierre Vandergheynst

An instrumented falling weight impact test is thoroughly investigated in two cases, that of a rebound and that of a rupture in the sample. First, the force signal is analyzed with four methods: the continuous wavelet transform (with different wavelets: derivatives of a Gaussian and Morlet's), the Gabor transform, the Wigner Ville transform and the classical Fourier analysis. It is shown how a proper use of the time frequency methods allows to precisely detect the discontinuities in the signal, the moment of

2001

MHD stability limits in the TCV tokamak

Holger Reimerdes

Magnetohydrodynamic (MHD) instabilities can limit the performance and degrade the confinement of tokamak plasmas. The Tokamak à Configuration Variable (TCV), unique for its capability to produce a variety of poloidal plasma shapes, has been used to analyse various instabilities and compare their behaviour with theoretical predictions. These instabilities are perturbations of the magnetic field which usually extend to the plasma edge where they can be detected with magnetic pick-up coils as magnetic fluctuat

EPFL2001

Muteness Failure Detectors: Specification and Implementation

Rachid Guerraoui, André Schiper

This paper extends the failure detector approach from crash-stop failures to muteness failures. Muteness failures are malicious failures in which a process stops sending algorithm messages, but might continue to send other messages, e.g., ``I am alive'' messages. The paper presents both the specification of a muteness failure detector, denoted ny M and an implementation of M in a partial synchrony model. We show that, modulo a simple modification, a consensus algorithm that has been designed in a crash-

Sprnger1999

Muteness Failure Detectors, Specification and Implementation

Rachid Guerraoui, André Schiper

This paper extends the failures detector approach from crash-stop failures to muteness failures. Muteness failures are malicious failures in which a process stops sending algorithm messages, but might continue to send other messages, e.g. 'I-am-alive' messages. The paper presents both the specification of a muteness failure detector, denoted by MA, and an implementation of MA in a partial synchrony model (there are bounds on message latency and clock skew, but these bounds are unknown and hold only after so

1999

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Related publications (19)