Model Development with Verification for Thermal Analysis of Torsional Vibration Dampers

Venczel, Márk and Veress, Árpád (2020) Model Development with Verification for Thermal Analysis of Torsional Vibration Dampers. In: International Conference of Numerical Analysis and Applied Mathematics (ICNAAM 2019), 2019.09.23-2019.09.28, Rhodes, Greece.

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Abstract

The crankshaft of aircraft's piston engine is exposed to harmful torsional vibration. If the oscillation reaches high value of amplitude fatigue damage of the propeller system occurs. To avoid this, torsional vibration damper can be mounted onto the free-end of the crankshaft. Visco-dampers are the simplest in structure but one of the most effective type of torsional vibration dampers, which have working fluid of silicone oil. Silicone oil is a non-Newtonian fluid and the highest effect on its lifetime is the temperature. Due to the thermal complexity of the structure and due to the lack of proper thermal measurement technology, it is a challenging task to perform thermal management of the damper especially based on purely analytical way. Numerical methods must be applied in design and development phase of the product to approximate the temperature field for lifetime calculation. A finite-difference-method based 2D thermal calculation procedure has been developed in MATLAB environment in order to reveal the hidden heat transfer processes among the damper components and to approximate the temperature distribution inside the structure with especial care for the silicone oil. The accuracy of the developed thermal model has been verified by a finite-volume-method based engineering software in ANSYS environment. The newly developed and verified thermal model has been used to update the Iwamoto-equation for providing more accurate outer surface temperature for the recently investigated damper housing in analytical way.

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