5 research outputs found

    A study of the effects of the properties of fuel, compression ratio and EGR on diesel exhaust soot physiochemical characteristics

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    This research work characterises diesel engine soot physiochemical properties and engine performance and emissions for the combustion of two common mineral diesel fuels (low and medium sulphur) and a RME B100 biodiesel fuel at two geometric compression ratios (19.5:1 and 16.5:1) and a broad range of EGR (10 to 55%) for an otherwise unmodified VW 1.9TDI 130PS engine. The principal focus of the research is the physiochemical characterisation of soot sampled from the engine exhaust manifold and also a DPF in the exhaust and exploring how the fuel type, compression ratio and EGR influence the soot properties and how these properties then influence the evolution of the soot in the exhaust. [Continues.

    Modelling of vehicle interior noise at reduced scale

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    The present paper describes some recent results on the development of simplified reduced-scale models that can be used for experimental studies of vehicle interior noise. In many important cases such simplified structural models can be described analytically, thus providing a developer with the effective engineering tools for prediction and mitigation of vehicle interior noise, especially on a design stage. The general approach is illustrated by a 1:4-scale simplified model of a car developed at Loughborough University – 'QUASICAR' (QUArter –Scale Interior Cavity Acoustic Rig). The model consists of a curved steel plate that is simply supported by two rigid side walls made of massive wooden panels. The effect of road irregularities exciting vehicle structural vibrations is imitated by electromagnetic shakers applied to the bottom of the steel plate. Measurements of structural vibrations and of the acoustic pressure generated inside the model are compared with the results of theoretical predictions

    Investigation of structural-acoustic coupling in a thin-walled reduced-scale model of a car

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    The present paper describes the results of the recent research into simplified reduced-scale thin-walled models that can be used for experimental studies of vehicle interior noise. In many important cases such models can be described analytically, thus providing a developer with the effective engineering tools for prediction and mitigation of vehicle interior noise, especially on a design stage. The structural simplification in the models is based on understanding the physics of generation of predominant modes of structural vibrations by particular dynamic forces and of radiation of sound by the excited vibrations into the vehicle interior. The above-mentioned general approach is illustrated by a 1:4-scale simplified physical model of a car developed at Loughborough University – 'QUASICAR' (QUArter –Scale Interior Cavity Acoustic Rig). The model consists of a curved steel plate that is simply supported by two rigid sidewalls made of massive wooden panels. The effect of road irregularities exciting vehicle structural vibrations is imitated by electromagnetic shakers applied to the bottom of the steel plate. Measurements of structural vibrations and of the acoustic pressure generated inside the model at different positions demonstrate their good conceptual agreement with the results of theoretical predictions

    Finite element calculations of structural-acoustic modes of vehicle interior for simplified models of motorcars

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    The present paper describes the results of finite element analysis of structural vibration modes, interior acoustic modes, and structural-acoustic modes in some simplified models of road vehicles having different levels of complexity, in particular in the QUArter-Scale Interior Cavity Acoustic Rig (QUASICAR) developed in Loughborough University. All the analysis has been carried out using the original code that had been developed in Patran Command Language (PCL) specifically for the purpose of this research. Resonant frequencies and spatial distributions of structural and acoustic modes have been calculated initially separately and then taking into account structuralacoustic interaction. The results have been compared with the experimental data obtained for QUASICAR. The comparison has demonstrated good agreement between numerical calculations and experimental results. The developed approach is reliable and efficient, and it can be extended to more complex vehicle models, thus assisting in better understanding of vehicle interior noise

    Finite element analysis of structural-acoustic interaction in simplified models of road vehicles

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    Finite element analysis of structural-acoustic interaction in simplified models of road vehicle
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