Your Selections

Priebsch, Hans H.
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

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,…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

On the Use of the Wave Based Technique for a Three-Dimensional Noise Radiation Analysis of Coupled Vibro-Acoustic Problems

Virtual Vehicle Research and Test Center-Jan Rejlek, Hans H. Priebsch
Published 2011-05-17 by SAE International in United States
Driven by both the ever more restrictive legal regulations on human exposure to noise and the growing customers' expectations regarding the functional performance of a product, the vibro-acoustic behaviour of the product have gained a significant importance over the last decades. At the same time, product development phase and costs have been reduced in order to comply with the nature of competitive market. To cope with those conflicting design targets, the computer aided engineering (CAE) became an essential part of the product design process.A broad class of engineering vibro-acoustic problems involves the mutual coupling interaction between the structure and fluid. In this type of problem, the back-coupling effects are no longer negligible and the problem has to be considered as a fully coupled system. The conventional state-of-the-art techniques adopt the element-based schemes, such as the finite (FEM), boundary (BEM) and infinite element method (I-FEM). The inherent non-symmetric nature of a coupled system, however, compromises the computational efficiency of the uncoupled sparse solvers, mainly due to the high bandwidth of the system matrices. As a result,…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Power Train Model Refinement Linked with Parameter Updating Through Nonlinear Optimization

SAE International Journal of Passenger Cars - Mechanical Systems

AVL LIST GmbH-Josef Zehetner
Virtual Vehicle Research and Test Center-Josef Girstmair, Hans H. Priebsch, Franz Reich
  • Journal Article
  • 2010-01-1421
Published 2010-06-09 by SAE International in United States
In the virtual development process validated simulation models are requested to accurately predict power train vibration and comfort phenomena. Conclusions from refined parameter studies enable to avoid costly tests on rigs and on the road. Thereby, an appropriate modeling approach for specific phenomena has to be chosen to ensure high quality results. But then, parameters for characterizing the dynamic properties of components are often insufficient and have to be roughly estimated in this development stage. This results in a imprecise prediction of power train resonances and in a less conclusive understanding of the considered phenomena. Conclusions for improvements remain uncertain.This paper deals with the two different aspects of model refinement and parameter updating. First an existing power train model (predecessor power train) is analyzed whether the underlying modeling approach can reproduce the physical behavior of the power train dynamics adequately. Thereby especially rotational irregularities of the power train causing the low frequency boom noise are considered. Based on the example “tire model”, different model improvements are investigated by means of sensitivity analysis. Efficient measures are…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Design Parameters of the Timing Chain Drive and Their Influence on Structure-Borne Noise Excitation-A Numerical Approach Based on a Fully Coupled Mbs-Model of the Timing Drive

AVL List GmbH and TU Graz-Martin Sopouch, Wolfgang Hellinger, Hans H. Priebsch, Thomas Schaffner
  • Technical Paper
  • 2002-08-0307
Published 2002-07-23 by Society of Automotive Engineers of Japan in Japan
Durability and lifetime requirements are the main reasons why timing drive systems of recent passenger car engines are often equipped with chain drives. From the NVH point of view chain- driven systems are usually more critical than synchronous belt- drives. In particular meshing impacts between chain and sprockets as well as impacts in the engagement/disengagement regions of sprockets/guides, lead to a considerable excitation of the engine's structure (whine noise). The MBS modelling of the entire timing drive as a fully coupled system and the assessment of the model's validity by measurements of primary dynamics and structural excitation is presented. The influence of selected chain drive's design parameters on structure-borne noise is evaluated.
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Simulation of Engine's Structure Borne Noise Excitation due to the Timing Chain Drive

AVL List GmbH-Wolfgang Hellinger
AVL List GmbH, Graz Austria and Christian-Doppler Laboratory for Engine and Vehicle Acoustics at Institute for Combustion Engines and Thermodynamics-Martin Sopouch
Published 2002-03-04 by SAE International in United States
Due to durability and lifetime requirements, the timing drive systems of modern passenger car engines are often equipped with chain drives. Chain driven systems are usually more critical in view of NVH compared to synchronous belt-drives. Mainly the polygonal effect and the related phenomena, like impacts caused by the meshing between the chain-links and impacts in the engagement/disengagement regions of guides and sprockets, lead to an increased excitation of the engine's structure. Since the polygonal effect occurs with the meshing frequency, the excited vibrations are basically narrow banded and can finally be recognized as an annoying whine-noise.This paper describes the modeling (MBS) of the entire timing-drive system containing a bushing-chain-drive, camshafts and all connected single valve trains. The investigations carried out are mainly focused on the primary dynamics of the chain drive and the forces which are transferred to the engine's structure. A comparison with measurements serves to assess the validity of the MBS-Model used in view of the primary chain-drive dynamics and induced structural excitation.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A Methodology to Simulate Piston Secondary Movement under Lubricated Contact Conditions

Christian-Doppler Laboratory for Engine and Vehicle Acoustics at Institute for Combustion Engines and Thermodynamics TU Graz and AVL List GmbH-Günter Offner, Hubert M. Herbst, Hans H. Priebsch
Published 2001-03-05 by SAE International in United States
The authors want to introduce a general methodology for the simulation of the dynamics of the piston-liner contact considering a realistic oil film at inner liner wall. Because of the complexity of this problem and in order to minimize computing time a twin model was developed. Firstly, a simplified model is used to compute piston motion trends and piston ring lubrication in minimum simulation time. Secondly a very detailed model simulating multi-body dynamics, surface vibrations and elasto-hydrodynamic contact is applied.Both, the theoretical background of the twin model and the advantages of the coupled simulation procedure given in the wide range of considerable influences are discussed. The result examples focus on interaction effects of piston secondary movement and the influence of the available oil film. Finally, the status of verification of the models using measured results is shown.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Structure Borne Noise Prediction Techniques

AUDI AG Ingolstadt, West Germany-Geert Kuipers
AVL LIST GmbH Graz, Austria-Hans H. Priebsch, Josef Affenzeller
Published 1990-02-01 by SAE International in United States
The Noise Vibration Harshness (=NVH) behaviour of engines or power units is the one of the predominant factors for market acceptance of vehicles.To reach this goal it is necessary to reduce the absolute noise level and also the noise level in specific frequency ranges. In diesel engines the predominant noise or vibrations are caused by combustion. This excitation is transferred via the crank train and bearings to the outer noise radiating engine surfaces. For gasoline engines this transfer path is also important. In such engines noise is created in the area of the main bearings by vibrations of the crankshaft.In this paper a new prediction technique for the above mentioned vibration transfer problems which was developed at AVL during the last three years is described. The work was carried out in cooperation with AUDI AG and VW AG, West Germany.This prediction technique is based on nonlinear Finite Element (FE) calculation methods and includes hydrodynamic calculation of the engine bearings. The results are obtained by a time history calculation of the response of the engine model…
Annotation ability available