Search Results

This work presents a study on dynamics of homocinetic half-shaft with constant velocity joints using experimental modal analysis. The first topic shows the development of a test rig that allows a representative simulation of the dynamic conditions imposed by the vehicle to the component concerning its first bending mode. Further, it is presented the development of an interative routine that allows the update of an analytical model that represents a dynamic behaviour based on experimental data.

The study of dynamic behaviour on mechanical components using experimental modal analysis allows the identification of parameters involved in this phenomenon in an objetive and realistic way. The object focused in this work is the homocinetic half-shaft used in F.W.D. passenger cars. The validity and limitation of the software used in this work is verified performing a benchmark with three distinct techniques of manual calculation. Mapping the influence of the identified parameters (boundary conditions, applied torque, spatial geometric configuration and excitation amplitude) allows a global view the dynamic behaviour of this component and indicates the necessary conditions to obtain representative data from laboratory experiments.

This paper describes the use of the transfer matrix method (T.M.M.)for the evaluation of in-plane flexural vibrations of half-shafts and, with the purpose of representing the concentrated damping and the articulation freedom of the constant velocity (C.V.) joints, a model is proposed. A software using the TMM was developed and the results obtained from frequency calculations are compared with those obtained by experimental modal analysis in three different situations: at the test rig on the laboratory, at the vehicle on the laboratory and at the vehicle on the field.