Flexible multibody simulation of automotive systems with non-modal model reduction techniques

The stiffness of the body structure of an automobile has a strong relationship with its noise, vibration, and harshness (NVH) characteristics. In this paper, the effect of the stiffness of the body structure upon ride quality is discussed with flexible multibody dynamics. In flexible multibody simul...

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Bibliographic Details
Published in:Vehicle system dynamics 2012-12, Vol.50 (12), p.1905-1922
Main Authors: Shiiba, Taichi, Fehr, Jörg, Eberhard, Peter
Format: Article
Language:English
Subjects:
Acoustics
Applied sciences
Exact sciences and technology
flexible multibody dynamics
Fundamental areas of phenomenology (including applications)
Gramian matrices
Krylov-subspace
Mechanical engineering. Machine design
model reduction
NVH analysis
OpenCRG
Physics
racing kart
Solid dynamics (ballistics, collision, multibody system, stabilization...)
Solid mechanics
Structural acoustics and vibration
Structural and continuum mechanics
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:The stiffness of the body structure of an automobile has a strong relationship with its noise, vibration, and harshness (NVH) characteristics. In this paper, the effect of the stiffness of the body structure upon ride quality is discussed with flexible multibody dynamics. In flexible multibody simulation, the local elastic deformation of the vehicle has been described traditionally with modal shape functions. Recently, linear model reduction techniques from system dynamics and mathematics came into the focus to find more sophisticated elastic shape functions. In this work, the NVH-relevant states of a racing kart are simulated, whereas the elastic shape functions are calculated with modern model reduction techniques like moment matching by projection on Krylov-subspaces, singular value decomposition-based reduction techniques, and combinations of those. The whole elastic multibody vehicle model consisting of tyres, steering, axle, etc. is considered, and an excitation with a vibration characteristics in a wide frequency range is evaluated in this paper. The accuracy and the calculation performance of those modern model reduction techniques is investigated including a comparison of the modal reduction approach.
ISSN:0042-3114
1744-5159
DOI:10.1080/00423114.2012.700403