Virtual Vehicle Competence Center ViF

Vehicle, Austria

Virtual Vehicle Competence Center ViF

Vehicle, Austria
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Rubab N.,Austrian Academy of Sciences | Rubab N.,University of Graz | Erkaev N.V.,Siberian Federal University | Langmayr D.,Virtual Vehicle Competence Center Vif | And 2 more authors.
Physics of Plasmas | Year: 2010

This study presents a theoretical approach to analyze the influence of kappa distributed streaming ions and magnetized electrons on the plasma wave propagation in the presence of dust by employing two-potential theory. In particular, analytical expressions under certain conditions are derived for various modes of propagation comprising of kinetic Alfv́n wave streaming instability, two stream instability, and dust acoustic and whistler waves. A dispersion relation for kinetic Alfv́n-like streaming instability has been derived. The effects of dust particles and Lorentzian index on the growth rates and the threshold streaming velocity for the excitation of the instability are examined. The streaming velocity is observed to be destabilizing for slow motion and stabilizing for fast streaming motions. It is also observed that the presence of magnetic field and superthermal particles hinders the growth rate of instability. Possible applications to various space and astrophysical situations are discussed. © 2010 American Institute of Physics.

Rubab N.,Austrian Academy of Sciences | Rubab N.,University of Graz | Erkaev V.,Siberian Federal University | Biernat H.K.,Austrian Academy of Sciences | And 2 more authors.
Physics of Plasmas | Year: 2011

Analysis of the electromagnetic streaming instability is carried out which is related to the cross field drift of kappa distributed ions. The linear dispersion relation for electromagnetic wave using Vlasov-fluid equations in a dusty plasma is derived. Modified two stream instability (MTSI) in a dusty plasma has been discussed in the limit ωpd 2/c 2k2 ⊥ < < 1. Numerical calculations of the growth rate of instability have been carried out. Growth rates of kinetic Alfvén instability are found to be small as compared to MTSI. Maximum growth rates for both instabilities occur in oblique directions for V 0 ≥ VA. It is shown that the presence of both the charged dust particles and perpendicular ion beam sensibly modify the dispersion relation of low-frequency electromagnetic wave. The dispersion characteristics are found to be insensible to the superthermal character of the ion distribution function. Applications to different intersteller regions are discussed. © 2011 American Institute of Physics.

Mader R.,AVL List GmbH | Mader R.,Graz University of Technology | Armengaud E.,AVL List GmbH | Armengaud E.,Virtual Vehicle Competence Center ViF | And 7 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2011

The shift of the automotive industry towards powertrain electrification introduces new automotive sensors, actuators and functions that lead to an increasing complexity of automotive embedded systems. The safety-criticality of these systems demands the application of analysis techniques such as PHA (Preliminary Hazard Analysis), FTA (Fault Tree Analysis) and FMEA (Failure Modes and Effects Analysis) in the development process. The early application of PHA allows to identify and classify hazards and to define top-level safety requirements. Building on this, the application of FTA and FMEA supports the verification of a system architecture defining an embedded system together with connected sensors and controlled actuators. This work presents a modeling framework with automated analysis and synthesis capabilities that supports a safety engineering workflow using the domain-specific language EAST-ADL. The contribution of this work is (1) the definition of properties that indicate the correct application of the workflow using the language. The properties and a model integrating the work products of the workflow are used for the automated detection of errors (property checker) and the automated suggestion and application of corrective measures (model corrector). Furthermore, (2) fault trees and a FMEA table can be automatically synthesized from the same model. The applicability of this computer-aided and tightly integrated approach is evaluated using the case study of a hybrid electric vehicle development. © 2011 Springer-Verlag.

Krammer M.,Virtual Vehicle Competence Center ViF | Marko N.,Virtual Vehicle Competence Center ViF | Armengaud E.,Virtual Vehicle Competence Center ViF | Geyer D.,AVL List GmbH | Griessnig G.,AVL List GmbH
Proceedings of the 15th IEEE International Conference on Emerging Technologies and Factory Automation, ETFA 2010 | Year: 2010

Electronic Control Units (ECUs) are implemented nowadays in safety-critical applications such as battery management or power control systems for hybrid vehicles. In this context, a critical product failure can harm people, environment or property and has therefore to be avoided. The challenge during the design of such components is to improve and guarantee the product quality while keeping flexibility for different variants and minimizing the development costs. We present in this paper first results of the newly started MEPAS project. The focus is set on improvements regarding requirements engineering as well as regarding the development of safety-relevant automotive embedded systems in the context of ISO 26262. ©2010 IEEE.

Armengaud E.,AVL List GmbH | Armengaud E.,Virtual Vehicle Competence Center ViF
Elektrotechnik und Informationstechnik | Year: 2011

Since several years the automotive industry strives for dealing with the fast growing system complexity, the increasing safety requirements and the increasing cost constraints of electronic components. In this work, we focus on two approaches: the time-triggered architecture which precisely specifies the system and its components both in the value and in the time domain, and component-based development which provides a framework for describing the system structure in a formalized way. We discuss in this paper the relationships between these two concepts and review methods for performing analysis and validation on top of component-based development frameworks. This combination is illustrated by a method for layered test and diagnosis for FlexRay communication architectures. © 2011 Springer-Verlag.

Griessnig G.,AVL List GmbH | Griessnig G.,University of Graz | Kundner I.,AVL List GmbH | Armengaud E.,AVL List GmbH | And 3 more authors.
Elektrotechnik und Informationstechnik | Year: 2011

Complexity in embedded systems engineering is increasing, imposing challenges to many industries. Especially the automotive industry has gone through significant changes with the application target of embedded systems moving towards safety-relevant applications. New safety standards as well as an increasing number of functionalities in a context of stringent cost constraints represent a complex challenge the industry is dealing with. In this paper, we provide an overview of two major challenges, the automotive industry is facing and of the main European research projects - with an emphasis to CESAR - focused on solving these challenges with respect to embedded systems engineering. We further discuss the reference technology platform as concept for tool integration and interoperability standard in order to significantly reduce costs. Finally, an exemplary realization of such reference technology platform for the automotive domain is presented. © 2011 Springer-Verlag.

Schwarzl C.,Virtual Vehicle Competence Center ViF | Wotawa F.,University of Graz
Elektrotechnik und Informationstechnik | Year: 2011

The vastly growing complexity of software enabled functionality - especially in the automotive industry where it is usually distributed over a network - requires also a steadily increasing number of test cases to ensure a high product quality. The automatic generation of test cases can ease this situation, but suffers from the well-known state space explosion problem, which is caused by the often infinite number of possible execution paths. The state space can be minimized by rules applied to test case generation leading to an enhanced scalability. A flexible rule adjustment according to the model structure allows a tailored test case generation capable of being fast as well as complete according to a given goal. In this work the implications of such rules on the searching capabilities are studied. The analysis is performed on a symbolic test generation engine based on a network of timed, deterministic UML state machines. © 2011 Springer-Verlag.

Hrach D.,University of Graz | Cifrain M.,Virtual Vehicle Competence Center ViF
Elektrotechnik und Informationstechnik | Year: 2011

Traction batteries occupy a central position in electric vehicles (EV). Besides the significant contribution to cost of the EV, the energy storage device affects the maximum power, the driving range and also the safety and lifetime of the vehicle, because a replacement of the complete battery pack after only a few years of service is not economically advantageous in most cases. Therefore it is inevitable to monitor and to manage the electrical and thermal condition of the battery, optimally. The underlying cell chemistry has a significant influence, some well-established types of batteries will therefore also be summarized. © 2011 Springer-Verlag.

Parise G.,Virtual Vehicle Competence Center ViF | Silar P.,Virtual Vehicle Competence Center ViF | Priebsch H.-H.,Virtual Vehicle Competence Center ViF | Miccoli G.,National Research Council Italy | And 2 more authors.
International Conference on Noise and Vibration Engineering 2012, ISMA 2012, including USD 2012: International Conference on Uncertainty in Structure Dynamics | Year: 2012

Recent years have seen an increase in the importance of analyzing the exterior noise generated by vehicle power trains, a trend which is expected to continue in light of the anticipated stringent update of the ISO 362 pass-by noise standard. To reduce exterior noise, there are a variety of analytical and computational methodologies available that can help design engine shields and other thermoacoustic trim parts that are positioned inside the engine bay. One such method is the Wave Based Technique (WBT), which uses the exact solutions of the governing differential equation instead of simple polynomial shape functions. Since a fine discretization is no longer required, the resulting wave based models are substantially smaller than their element-based counterparts. This paper describes a proposed application of the WBT to a car mock-up and compares the results with those achieved via the Boundary Element method and the Perfectly Matched Layer method. © (2012) by the Katholieke Universiteit Leuven Department of Mechanical Engineering. All rights reserved.

Tengg A.,Virtual Vehicle Competence Center ViF | Hank P.,NXP Semiconductors
2012 IEEE I2MTC - International Instrumentation and Measurement Technology Conference, Proceedings | Year: 2012

In this paper we describe a low level method for detecting and locating faults in the electrical physical layer of automotive networks based on time-domain reflectometry. Especially for safety-critical networks this approach could be a valuable complement for the existing network management layers, since it has the potential to detect damaged cables and plugs even before they cause serious malfunctions. We illustrate the feasibility of the proposed method by analyzing several FlexRay clusters with- and without faults. © 2012 IEEE.

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