Characterization of the frequency‐dependent properties of damping materials

Abstract

In this paper an experimental method for determining the frequency-dependent stiffness and damping properties is presented. The aim is to obtain valid input parameters for a simulation model that considers the most important effects of typical damping materials without the necessity of poroelastic material formulations, which require at least five different input parameters. These parameters are difficult and expensive to determine experimentally. Moreover, the determination procedure is not very robust and the results can easily vary [1]. Additionally, such parameters are often phenomenological without having a physical meaning. For these reasons, it is promising to use a simpler material model based on frequency-dependent stiffness and damping parameters within numerical simulations in order to be able to predict the acoustic behavior of complex systems with different damping and insulation treatments sufficiently.

Topology optimisation of lattice structures to increase damping

“…Using the stated expressions the damping quantities can be calculated for every excitation frequency Ω, while other methods are only suitable in the region of natural frequencies for instance by using the half width of the resonance peak [3]. The method using harmonic excitation is widely used to determine damping and stiffness quantities - [4,5]. Stiffness, damping resistance and loss factor were measured for three different lattice structures for different excitation frequencies while outer dimensions and material are kept constant.…”