MSc thesis project proposal

Nonlinear material models for transducer membranes

Project outside the university


This project is a collaboration with the Sonion Company in Hoofddorp. There are options for final project and also internship.

Goal of this project is to investigate the nonlinear behaviour of the sealing layer in miniaturized loudspeakers membranes and its effects on the transducer frequency response. The sealing layer, polymer-based foil with thickness ranging from 10 to 30 um, is placed on the transducer membrane to acoustically seal the front and back chamber while being mechanically transparent. A fully coupled FEA-based model will be developed by using COMSOL software


The investigation will include the following aspects:
-    Sealing foil implementation by using 3D solid domains or 2D shell boundary settings
-    Electro-mechano-acoustical coupling with and without thermo-viscous damping
-    Parameter mesh sensitivity to properly predict the frequency response of the model
-    Nonlinear material response of the sealing layer as a function of membrane displacement



•    At least a bachelor’s degree in mechanical engineering, electrical engineering and/or physics
•    Knowledge of engineering processes/principles
•    Ability to write technical documentation
•    Capable of thinking on a system level as well as on component level  
•    Familiarity with one (or more) of the following topics: acoustics, finite element methods, electromagnetism, computational mechanics.
•    Easy learner (to use new FEM-based softwares (COMSOL) or SPICE simulators (OrCAD, LTSpice).
•    Basic knowledge of Mathworks Matlab.
•    Result driven
•    Pro-actively searching for solutions
•    Not afraid to think “outside of the box”



prof.dr. Paddy French

Bioelectronics Group

Department of Microelectronics

Last modified: 2022-11-21