Graphene squeeze-film microphone

Within this research a nouvelle microphone design is posed, modelled and tested. The design consists of a cavity covered by a membrane and having a venting channel, it uses the squeeze-film effect in order to link pressure to the membranes resonance and by extension acoustics to the membranes resonance. In [1] the squeeze-film effect was first...

Effect of instrumentation position and direction inaccuracy on the calculation of virtual point transformed FRFs

This work comprises research in the field of Experimental Dynamics. This technique is currently used in the automotive area and is used to enhances the current state of FEM with the inclusive of test- based models. Building test-based models for EDS (Experimental Dynamic Substructuring) requires very accurate measurement, and this thesis...

The emergence of dissipation dilution: in doubly clamped nanomechanical resonators

The goal of the research described in this thesis was to investigate the basis of dissipation dilution as well as make it comprehensible. In the written literature we could find that the kinetic energy of an oscillating beam is stored into two types of potential energy~\cite{Kippenberg, Kotthaus}. A dissipative bending component and a...

Graphene Gas Sensor

Gas permeation through graphene membranes has received considerable<br/>attention for water purification and molecular sieving applications. However,<br/>characterization of the permeation has been limited to long timescales<br/>of minutes. This thesis shows a method for measuring gas permeation<br/>through porous graphene membranes at the...