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  • 51.
    Karlsson, T.
    et al.
    Scania CV, Sweden.
    Glav, Ragnar
    Scania CV, Sweden.
    Simulation of the sound attenuation properties in highly complex exhausts system using the 2-port technique2011Conference paper (Refereed)
    Abstract [en]

    Simulation using basic acoustic 2-port elements is a time effective method for prediction of the attenuation of single components as well as of complete exhaust aftertreatment and silencer systems. However, with the complexity of current systems, the transformation from design geometries to networks of basic elements is not straightforward. In this paper a practical example of the modelling of a modern exhaust aftertreatment system is presented. A silencer aimed at the Euro 6 heavy duty emissions legislation containing complex flow turnings, parallel branches, DOC (Diesel Oxidation Catalyst), DPF (Diesel Particulate Filter) and SCR (Selective Catalytic Reduction) catalysts was modelled. Evaluation against measurements in order to understand the influence of the different acoustic elements upon overall attenuation and to improve the model with respect to near field and higher order mode effects was done. With the resulting accuracy, the 2-port model still, despite the geometrical complexity, offers a tractable tool for analysis and design of complete exhaust system in order to gain insertion loss either by modifying existing elements or by adding new.

  • 52.
    Lindborg, M. N.
    et al.
    Scania CV AB, Sweden .
    Karlsson, Mikael
    Scania CV AB, Sweden .
    Glav, R
    Scania CV AB, Sweden .
    Karlsson, Tony
    Scania CV AB, Sweden .
    Acoustic characterization of shallow flow reversal chambers2011Conference paper (Refereed)
    Abstract [en]

    Flow reversal chambers are common design elements in mufflers. Here an idealized flow reversal chamber with large cross-section but small depth has been studied. The inlet and outlet ducts as well as the cross-sectional area are fixed while the depth of the chamber can be varied. The resulting systems are then characterized experimentally using the two-microphone wave decomposition method and compared with results from both finite element modeling and various approaches using two-port elements. The finite element modeling results are in excellent agreement with the measurements over the whole frequency range studied, while two-port modeling can be used with engineering precision in the low frequency range. The influence of mean flow was studied experimentally and was shown to have relatively small influence, mainly adding some additional losses at low frequencies. This study yields an insight into the modeling approach necessary to capture the acoustical behavior of a flow reversal chamber. For initial studies of the performance the recommendation is to model the flow reversal as a straight duct two-port element connecting the inlet and outlet. For more in depth studies finite element modeling should be used to construct a two-port element for inclusion in a network model.

  • 53.
    Lund, Katarina
    et al.
    KTH, School of Industrial Engineering and Management (ITM), Machine Design (Dept.), Integrated Product Development.
    Glav, Ragnar
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
    Strategies for managing micro-level contextual ambidexterity: Combining exploration and exploitation in R&D2015In: Proceedings of the 15th annual CINet conference, 2015Conference paper (Refereed)
    Abstract [en]

    In this paper we study the achievement of contextual ambidexterity at the individual level, i.e. the micro-level. We explore how employees in four different teams in an automotive company use different strategies to prioritise time between, on the one hand exploration such as pre-development activities and research and, on the other hand exploitation such as realising set concepts in the later phases of the product development process. Based on our findings we argue that the status of exploratory activities must be elevated to equal levels with exploitation activities if ambidexterity is to achieved without using separation as the main strategy. We propose that clear goal setting, stricter follow-up of exploratory activities, and high levels of endurance among managers in change initiatives are ways to achieve a contextually ambidextrous organisation.

  • 54. Nygård, Stefan
    et al.
    Lindgren, Kent
    Glav, Ragnar
    Mätstudie av några avgassystems strömningsakustiska egenskaper: en mätrapport utförd åt Volvo PV2000Report (Other academic)
  • 55.
    Rumpler, Romain
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Glav, Ragnar
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
    Göransson, Peter
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL. KTH, School of Engineering Sciences (SCI), Centres, VinnExcellence Center for ECO2 Vehicle design.
    Off-Peak Hours Deliveries: An Acoustic Perspective on the Stockholm Pilot Study2018In: Noise News International, ISSN 1021-643X, Vol. 26, no 2, p. 18-20Article in journal (Other (popular science, discussion, etc.))
  • 56.
    Scarpati, Jose
    et al.
    SCANIA CV, Södertälje, Sweden.
    Wikström, Adam
    Scania CV, Södertälje, Sweden.
    Jönsson, Ola
    Scania CV, Södertälje, Sweden.
    Glav, Ragnar
    Scania CV, Sweden.
    Händel, Peter
    KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Hjalmarsson, Håkan
    KTH, School of Electrical Engineering (EES), Automatic Control. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.
    Prediction of Engine Noise using Parameterized Combustion Pressure Curves2007In: SAE technical paper series, ISSN 0148-7191Article in journal (Refereed)
    Abstract [en]

    A parameterization for combustion chamber cylinderpressures is tuned to measurements on an inline 6cylinder Diesel engine at different operating conditions.Both measured and modeled signals are filtered in thefrequency domain and according to the so called Lucasattenuation. Two different estimates of engine radiatednoise are obtained and compared in this fashion. Theinfluence of physically meaningful parameters on thefrequency contents of the final noise level is analyzed,as well as the contribution of the pressure trace of themotored engine. The scattering of data in the pressuresignal is calculated as a function of the crank angleallowing for statistical considerations.

  • 57.
    Wallin, Hans Petter
    et al.
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
    Carlsson, Ulf
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
    Åbom, Mats
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
    Bodén, Hans
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, MWL Flow acoustics.
    Glav, Ragnar
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
    Hildebrand, Robert
    KTH, School of Engineering Sciences (SCI), Aeronautical and Vehicle Engineering, Marcus Wallenberg Laboratory MWL.
    Sound and vibration2010 (ed. 2., rev. uppl.)Book (Other academic)
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