Efficient Vibro-Acoustic Optimisation of a Thermoplastic Composite Oil Pan 2018-01-1480
Thermoplastic fibre reinforced composites offer a wide range of adjusting the material behaviour by varying material selection, layup and fibre orientation. By default, damping and stiffness of composites are contradictory material properties related to the fibre orientation. Thus, finite element analysis (FEA) based composite design requires special modelling efforts implying anisotropic damping of the composite as well as fluid-structure-inter-action for the oil filling. In contrast, multi-dimensional optimisations for various layups require computationally fast numerical solutions.
In this study, a complex but efficient vibro-acoustic modelling approach of a composite oil pan is presented. The FEA model includes a strain energy based modal damping approach for the layerwise accumulation of the anisotropic composite damping as well as a structural representation of the additional mass of the oil filling avoiding fluid modelling. Moreover, the radiated sound power of the component is determined by a structural dynamic steady state FEA using surface velocity based approaches. Next, the scalar optimisation objective, the mean sound power or the total energy within the frequency range, is further estimated by a semi-analytic approximation based on the resonance values.
This continuous simulation methodology is further used to design a vibro-acoustically optimised layup for a thermoplastic composite oil pan. The fibre orientation of single layers is chosen assuring a light, stiff and less radiating component.
Citation: Klaerner, M., Wuehrl, M., Kroll, L., and Marburg, S., "Efficient Vibro-Acoustic Optimisation of a Thermoplastic Composite Oil Pan," SAE Technical Paper 2018-01-1480, 2018, https://doi.org/10.4271/2018-01-1480. Download Citation
Author(s):
Matthias Klaerner, Mario Wuehrl, Lothar Kroll, Steffen Marburg
Affiliated:
Chemnitz University of Technology, Technical University of Munich
Pages: 10
Event:
10th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference
ISSN:
0148-7191
e-ISSN:
2688-3627
Related Topics:
Finite element analysis
Composite materials
Fibers
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