Finite Element Model Correlation of an Automotive Propshaft with Internal and External Dampers

In the absence of prototypes, analytical methods such as finite element analysis are very useful in resolving noise and vibration problems, by predicting dynamic behavior of the automotive components and systems. Finite Element Analysis (FEA) is a simulation technique and involves making assumptions that affect analytical results. Acceptance and use of these results is greatly enhanced through test validation.

In this paper, dynamic behavior of the automotive propshaft equipped with cardboard liner and torsional damper is investigated. The finite element model is validated at both component and subsystem levels using frequency response functions. Effects of the cardboard liner and torsional damper on the propshaft bending, torsional and breathing frequencies are studied under free-free boundary conditions. Effects of the U-Joint stiffness along with other design variables on the driveshaft dynamic behavior are also studied.

Excellent correlation has been achieved between the test and the analytical model results up to 1200 Hz. The investigation evaluates the effect of U-joint stiffness on propshaft assembly natural frequencies. The effect of internal damper on shell modes and external damper on the torsional modes also has been investigated.