EXPERIMENTAL IDENTIFICATION OF NONLINEAR JOINT MODELS: APPLICATION TO AUTOMOTIVE HEADLAMPS

Lionel Manin (1) , Abdelhak Hmid , Christine Roucoules , Regis Dufour (1)

1 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]

The work presented deals the dynamic and vibration behavior of automotive headlamps. Some vibration tests have exhibited nonlinear behavior of these optical systems regarding the excitation amplitude and/or the direction of the frequency sweep. The causes of these nonlinear phenomena can be a priori attributed to the joints that connect the reflector part to the housing part. The types of nonlinearities considered are: stick-slip, clearance, friction. An experimental analysis is conducted to identify the models that are the most suitable to predict the joints dynamic behavior. A specific test rig has been designed. Three different joints are considered, they are subjected to a forced alternated displacement. The force – displacement curves obtained are analyzed versus the amplitude and the frequency of the imposed displacement. Then the parameters for the models are estimated concerning: the Masing model, the Kelvin Voigt and a spring with two stop ends. Some dependency is observed with respect to the frequency. The results are discussed and future work orientations are given.

Mots clés: joint nonlinear behavior; experimental; identification; automotive optical systems

Domaines: Mécanique des structures [physics.class-ph]

Lionel Manin, Abdelhak Hmid, Christine Roucoules, Regis Dufour. EXPERIMENTAL IDENTIFICATION OF NONLINEAR JOINT MODELS: APPLICATION TO AUTOMOTIVE HEADLAMPS. International conference on structural engineering dynamics, Nuno Maia, Jun 2015, Lagos, Portugal. ⟨hal-01248112⟩