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Reich, Franz Markus
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Simulation of Sound Transmission through Automotive Turbochargers

KTH-Competence Centre for Gas Exchange-Sabry Allam
Virtual Vehicle Competence Center-Rafael Veloso, Yasser Elnemr, Franz Markus Reich
Published 2012-06-13 by SAE International in United States
The use of turbochargers for production cars has been increasing due to the current trend of engine downsizing. Acoustically, it acts as a damper of the pressure pulsations from the engine that propagate through the intake and exhaust system. This effect is referred to as the passive acoustic properties of a turbocharger. The aim of this paper is to investigate the passive acoustic properties of an automotive turbocharger compressor and turbine and to develop and verify an acoustical model of the turbocharger.To investigate the acoustic properties such as the transmission loss and the transfer function through these elements under different operating conditions, acoustic two-port measurements were performed on a turbocharger test rig at different flow conditions. A geometry-based acoustical model of the turbocharger was developed for both the compressor and turbine to provide both the transmission loss and the transfer function of these elements and verified by means of non-linear time-domain 1-D gas dynamics simulation.A good agreement between measurement and simulation of the upstream and downstream acoustic transmission loss of the turbocharger was achieved and…
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Improved Comfort Analysis and Drivability Assessment by the Use of an Extended Power Train Model for Automatic Transmissions

SAE International Journal of Passenger Cars - Mechanical Systems

AVL LIST GmbH-Klaus Meitz
Gesellschaft für Industrieforschung mbH-Sigrid Klinger
  • Journal Article
  • 2012-01-1529
Published 2012-06-13 by SAE International in United States
The new generation of automatic transmissions is characterized by a compact and highly efficient design. By the use of a higher overall gear ratio and lightweight components combined with optimal gear set concepts it is possible to improve significantly fuel consumption and driving dynamics. Precise and efficient real time models of the whole power train including models for complex subsystems like the automatic transmission are needed to combine real hardware with virtual models on XiL test rigs. Thereby it's possible to achieve a more efficient product development process optimized towards low development costs by less needed prototypes and shorter development times by pushing front loading in the process.In this paper a new real time model for automatic transmissions including approved models for the torque converter, the lock-up clutch and the torsional damper are introduced. At the current development stage the model can be used for comfort analysis and drivability assessment. Thereby various operating conditions including motored engine and an open, slipping or locked clutch condition can be simulated. For the torque converter a map based,…
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Power Train Model Characteristics for Vibration Analyses – Conflicting Demands in Off Line and HiL Environments

AVL List-Dusko Prezel
Virtual Vehicle Competence Center-Josef Girstmair, Hans-Herwig Priebsch, Franz Markus Reich
Published 2009-05-19 by SAE International in United States
High quality predicting of power train vibration behaviour is desired in the early design stage for efficient vehicle development. Conflicting demands arise, since precise, fast simulation models are required. High precision of the models will allow for the elimination of resonance phenomena for future products, thereby ensuring their comfort for the customers. Fast simulations are becoming increasingly important for linking test environments with virtual prototypes under development.This paper deals with different aspects in these conflicting demands for power train vibration models. First, the paper investigates real-time capable mechanical models and decided in favor of the object-oriented modeling approach “for requirements of Hardware in the Loop” (HiL). This paper takes a closer look at the advantages of the object-oriented approach, the model setup, its validation and the test results. A further criterion for the real-time capability is an efficient time integration of the solutions.The result quality of these fast models is then successively compared to offline models as applied in multi-body dynamics (MBD). Even in the low frequency range, the torsional vibrations of the engine are…
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