Anand Pitchaikani
Emmeskay, Inc, USA
Shankar Venkataraman
Emmeskay, Inc, USA
Kiran Kumar Koppu
Emmeskay, Inc, USA
John Batteh
Emmeskay, Inc, USA
Michael Tiller
Emmeskay, Inc, USA
Ladda ner artikel
http://dx.doi.org/10.3384/ecp09430009Ingår i: Proceedings of the 7th International Modelica Conference; Como; Italy; 20-22 September 2009
Linköping Electronic Conference Proceedings 43:49, s. 444-453
Publicerad: 2009-12-29
ISBN: 978-91-7393-513-5
ISSN: 1650-3686 (tryckt), 1650-3740 (online)
For developing high-quality and cost-efficient products; it is important to evaluate and compare system level performance for different configurations early in the development process. This paper will present the development of a vehicle system model in Modelica that is used to study the overall vehicle power-train torsional vibrations that impact Noise; Vibration & Harshness (NVH) characteristics of the vehicle. In this study; a detailed crank-angle resolved; multi-cylinder engine model is constructed; which includes intake/exhaust dynamics; combustion; heat transfer; engine friction and rotational dynamics of piston-crank mechanism. The engine model accurately reproduced real-world engine torque and acceleration fluctuations. The lumped parameter powertrain system model which includes clutch (and associated vibration isolation components); transmission; driveline and chassis is developed and used with the engine model to predict torsional vibrations. This system model is used to understand the powertrain torsional vibration characteristics in different operating regions such as idling; driving and coasting conditions.
To demonstrate the applicability of the developed models; results of unit tests for independent components; especially the engine torque variation and the clutch torsion characteristic; and the system-level quantitative validation with test data are presented. A special model that does fast Fourier transform of the signal on the fly is presented and its role in the analysis discussed. We present a comparison of rattle noise between two compliant clutch (isolator) designs and discuss the rattle metrics used in the analysis. Generic considerations for the deployment of such system level models are also discussed in this paper.
[1] R. Brancati; E. Rocca; R. Russo; An analysis of the automotive driveline dynamic behavior focusing on the influence of the oil squeeze effect on the idle rattle phenomenon; Journal of Sound and Vibration 303 (2007) 858-872.
doi: 10.1016/j.jsv.2007.02.008.
[2] Y. Wang; R. Manoj; W. J. Zhao; Gear rattle modeling and analysis for automotive manual transmissions; Proceedings of Imech; Journal of Automobile Engineering 215 (part D) (2001) 241–258.
doi: 10.1243/0954407011525610.
[3] R. Singh; H. Xie; R. J. Comparin; Analysis of automotive neutral gear rattle; Journal of Sound and Vibration 131 (2) (1989) 177–196.
doi: 10.1016/0022-460X(89)90485-9.
[4] R. Brancati; E. Rocca; R. Russo; A gear rattle model accounting for oil squeeze between the meshing gear teeth; Proceedings of Imech 219 (part D) 1075-1083.
[5] A. R. Crowther; C. Janello; R. Singh; Quantification of clearance-induced impulsive sources in a torsional system; Journal of Sound and Vibration 307 (2007) 428-451.
doi: 10.1016/j.jsv.2007.05.055.
[6] M. Tiller; W.E. Tobler; and M. Kwang; Evaluating Engine Contributions to HEV Driveline Vibrations; 2nd International Modelica Conference (2002) Proceedings; PP 19 – 24.
[7] Michael Tiller; Paul Bowles; Mike Dempsey; “Development of a Vehicle Modeling Architecture in Modelica”; 3rd International Modelica Conference (2003) Proceedings; pp. 75-86.
[8] Newman; C.; Batteh; J.; and Tiller; M.; 2002; "Spark-Ignited-Engine Cycle Simulation in Modelica"; 2nd International Modelica Conference Proceedings; pp. 133-142.
[9] John Batteh; Michael Tiller and Charles Newman; “Simulation of Engine Systems in Modelica”; 3rd International Modelica Conference Proceedings; pp. 139-148.
[10] M. Dempsey; S. Biggs and N. Dixon; Simulating driveability using Dymola and Modelica; 4th International Modelica Conference Proceedings; http://www.modelica.org/events/Conference2005/online_proceedings/Session3/Session3a4.pdf
[11] J. Batteh and M. Tiller; "Analytic Evaluation of Engine NVH Robustness Due to Manufacturing Variations"; ASME 2005 Internal Combustion Engine Division Spring Technical Conference; pp. 429-437
[12] Modelica Specification; version 3.0; www.modelica.org/documents/ModelicaSpec30.pdf
[13] M. Tiller; "Introduction to Physical Modeling with Modelica"; Kluwer Academic Publishers; ISBN 0-7923-7367-7
[14] Modelica; http://www.Modelica.org.
