Reduced Order Models for Dynamic Behavior of Elastomer Damping Devices
Résumé
In the context of passive damping, various mechanical systems from the space
industry use elastomer components (shock absorbers, silent blocks, flexible joints...). The
material of these devices has frequency, temperature and amplitude dependent characteristics.
The associated numerical models, using viscoelastic and hyperelastic constitutive behaviour,
may become computationally too expensive during a design process. The aim of this work is
to propose efficient reduced viscoelastic models of rubber devices. The first step is to choose
an accurate material model that represent the viscoelasticity. The second step is to reduce the
rubber device finite element model to a super-element that keeps the frequency dependence.
This reduced model is first built by taking into account the fact that the device’s interfaces are
much more rigid than the rubber core. To make use of this difference, kinematical constraints
enforce the rigid body motion of these interfaces reducing the rubber device model to twelve
dofs only on the interfaces (three rotations and three translations per face). Then, the superelement
is built by using a component mode synthesis method. As an application, the dynamic
behavior of a structure supported by four hourglass shaped rubber devices under harmonic loads
is analysed to show the efficiency of the proposed approach.
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