University of Twente Student Theses


Modelling and improved design of a displacement converter for a thin sound source

Hollaar, C.C.J. (2023) Modelling and improved design of a displacement converter for a thin sound source.

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Embargo date:7 July 2025
Abstract:In the past, designs have been proposed for making energy-efficient thin flat acoustic sources. These designs relied on piezoelectric stack actuators placed parallel to the diaphragm and a conversion mechanism that moved the diaphragm, which consisted of a lightweight sandwich structure. These past designs were only usable for limited frequency ranges and contained over- and underconstraints. In this master thesis a simpler design was made and modelled. Based on modelling results the design was optimised through multiple iterations. Improvements were aimed at increasing the first natural frequency of the system whilst not exceeding the stress fatigue limit. Once sufficient simulated performance was achieved, the design was manufactured to validate the model. Due to practical constraints the manufactured design deviates from the optimised model in multiple ways. In order to validate the model using the manufactured design, the model was adapted to the manufactured specs. The manufactured design was tested to identify the natural frequencies and subsequently the acoustic behaviour was tested using microphones. The results showed a natural frequency of 340Hz, which was predicted quite well by the model. Using this model a thin sound source for 20-500Hz seems achievable.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:52 mechanical engineering
Programme:Mechanical Engineering MSc (60439)
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