In this article, the effect of material aging of an elastomeric main spring (MS) inside a hydraulic engine mount (HEM) on its dynamic performance is investigated. A set of HEMs aged under realistic operational conditions are used to create an empirical material aging model of the elastomer at two different temperatures (35°C and 95°C) using dynamic mechanical thermal analysis (DMTA). These aging models are then coupled to a multibody system (MBS) model of the HEM such that the output simulates variations of the dynamic stiffness, damping, and transmissibility against age (defined as vehicle distance travelled) and the operating engine frequency at these temperatures. The simulation results represent how the dynamic performance of the HEM deviates from its original design with age and how the transmitted force from the engine to the chassis (which is considered as a key indicator for vehicle ride comfort) varies with age, engine frequency, and temperature. This provides new information and knowledge on the dynamic performance of the vehicle as the HEM ages under realistic operating conditions.

https://www.researchgate.net/publication/348390790_Dynamic_Modelling_of_...

Post doctoral position at Brest, France.

Title: Analysis of the effects of transfer and storage phases
on the behavior of bonded joints for SYLDA5 structures

A post-doctoral fellowship is available at LBMS-ENSTA
Bretagne (www.lbms.fr) in the field of the characterization of thermal and
aging effect on the behavior of bonded
joints for aerospace applications. The
present fellowship, funded by the CNES, is a part of a project developed at the
LBMS (J. Y. Cognard, N. Carrere and R. Creac'hcadec) in collaboration with
IFREMER (P. Davies, Brest) and with CNES (F. Lavelle) on the optimization
of bonded joints for aerospace
applications.

More details please find in the attached file.

Contacts for this post are:

Jean-Yves COGNARD

Laboratoire Brestois de Mécanique et des Systèmes

EA 4325 - ENSTA Bretagne / Université de Brest / ENIB

ENSTA Bretagne (ex ENSIETA)

2 rue Francois VERNY, 29806 BREST CEDEX 9, FRANCE

Tel : 02 98 34 88 16 - Fax : 02 98 34 87 30

email : jean-yves.cognard@ensta-bretagne.fr

Florain LAVELLE

CNES DLA/SDT/STM

Tel : 01 60 87 72 28

email: florian.lavelle@cnes.fr