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ACOUSTIC POSTPROCESSING FOR MULTIBODY SIMULATIONS INCLUDING FLEXIBLE BODIES

Carrarini, Antonio (2009) ACOUSTIC POSTPROCESSING FOR MULTIBODY SIMULATIONS INCLUDING FLEXIBLE BODIES. Multibody Dynamics, ECCOMAS, 29. Jun. - 2. Juli 2009, Warschau, Polen.

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Abstract

In this paper an acoustic postprocessor for multibody simulations is presented. The tool computes the sound power on the surface of a generic vibrating flexible body. The radiated sound power is not computed because this would require the knowledge of the radiation efficiency. Such parameter can be determined by an ulterior analysis including the fluid/structure interface, to be performed by an appropriate Finite Element or Boundary Element analysis. The sound power computed by the presented tool can be directly used for the relative acoustic assessment of mechanical parts with respect to design variations or modified boundary conditions. Moreover, the computed sound power directly leads to an estimate of the radiated power – and thus eventually of the noise level – if the radiation efficiency can be deduced from experience or empiric formulas, which is the case of most engineering problems. As an application example, the acoustic behavior of a railway wheelset is studied. The wheelset is modeled as a flexible body and integrated in the multibody model of a complete vehicle. Two operative cases have been considered: first, the vehicle driving through a switch, with the resulting impulsive noise due to the wheel rolling over the rail gap in the middle of the switch (“frog”); secondly, the rolling noise due to wheel and rail roughness – a dramatic problem especially for freight vehicles.

Document Type:Conference or Workshop Item (Speech, Paper)
Title:ACOUSTIC POSTPROCESSING FOR MULTIBODY SIMULATIONS INCLUDING FLEXIBLE BODIES
Authors:
AuthorsInstitution or Email of Authors
Carrarini, AntonioAntonio.Carrarini@DLR.de
Date:2009
Refereed publication:Yes
In ISI Web of Science:No
Editors:
EditorsEmail
Arczewski, KUNSPECIFIED
Fraczek, JUNSPECIFIED
Wojtyra, MUNSPECIFIED
Status:Published
Keywords:Multibody simulation, flexible bodies, acoustics, structure borne sound, modal analysis, railway rolling noise
Event Title:Multibody Dynamics, ECCOMAS
Event Location:Warschau, Polen
Event Type:international Conference
Event Dates:29. Jun. - 2. Juli 2009
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Transport
HGF - Program Themes:Terrestrial Vehicles
DLR - Research area:Transport
DLR - Program:V BF - Bodengebundene Fahrzeuge
DLR - Research theme (Project):V - Next Generation Train (old)
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Robotics and Mechatronics > System Dynamics and Control (former Control Design Engineering)
Deposited By: Monika Klauer
Deposited On:14 Jan 2010 15:23
Last Modified:12 Dec 2013 20:52

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