Airbus

About: Airbus is a company organization based out in Bengaluru, Karnataka, India. It is known for research contribution in the topics: Fuselage & Signal. The organization has 10633 authors who have published 13089 publications receiving 88354 citations. The organization is also known as: Airbus Commercial Aircraft.

Device simulation study of the SEU sensitivity of SRAMs to internal ion tracks generated by nuclear reactions

Abstract: Single-event upsets (SEUs) in static random access memories (SRAMs) are investigated using three-dimensional (3-D) full cell device simulations for tracks that do not cross the OFF n-channel MOSFET drain. These tracks are representative of the most probable geometrical cases when the ions are generated inside the device by nuclear reactions, and then address one important part of neutron- or protons-induced soft errors. It is found that the duration and magnitude of the ion-induced current pulse strongly depends on the track location. As a result, the flipping of the memory cell is delayed, and the critical charge involved during the upset is no longer constant. A linear relationship between the critical charge and the delay is found and is explained by the contribution of the ON p-channel MOSFET. The increase of the ion current pulse delay and broadening when the track is moved away from the drain is explained on the basis of the diffusion-collection mechanism. Indications on the size of the sensitive regions are derived.

PROARTIS: Probabilistically Analyzable Real-Time Systems

Abstract: Static timing analysis is the state-of-the-art practice of ascertaining the timing behavior of current-generation real-time embedded systems. The adoption of more complex hardware to respond to the increasing demand for computing power in next-generation systems exacerbates some of the limitations of static timing analysis. In particular, the effort of acquiring (1) detailed information on the hardware to develop an accurate model of its execution latency as well as (2) knowledge of the timing behavior of the program in the presence of varying hardware conditions, such as those dependent on the history of previously executed instructions. We call these problems the timing analysis walls.In this vision-statement article, we present probabilistic timing analysis, a novel approach to the analysis of the timing behavior of next-generation real-time embedded systems. We show how probabilistic timing analysis attacks the timing analysis walls; we then illustrate the mathematical foundations on which this method is based and the challenges we face in the effort of efficiently implementing it. We also present experimental evidence that shows how probabilistic timing analysis reduces the extent of knowledge about the execution platform required to produce probabilistically accurate WCET estimations.

X-ray microtomography analysis of the damage micromechanisms in 3D woven composites under low-velocity impact

Abstract: 3D woven composites reinforced with either S2 glass, carbon or a hybrid combination of both and containing either polyethylene or carbon z-yarns were tested under low-velocity impact. Different impact energies (in the range of 21–316 J) were used and the mechanical response (in terms of the impact strength and energy dissipated) was compared with that measured in high-performance, albeit standard, 2D laminates. It was found that the impact strength in both 2D and 3D materials was mainly dependent on the in-plane fiber fracture. Conversely, the energy absorption capability was primarily influenced by the presence of z-yarns, having the 3D composites dissipated over twice the energy than the 2D laminates, irrespective of their individual characteristics (fiber type, compaction degree, porosity, etc.). X-ray microtomography revealed that this improvement was due to the z-yarns, which delayed delamination and maintained the structural integrity of the laminate, promoting energy dissipation by tow splitting, intensive fiber breakage under the tup and formation of a plug by out-of-plane shear.