University of Twente Student Theses


The design of an adaptive acoustic system for flexible sound attenuation in variable conditions

Wolff, R.T. de (2023) The design of an adaptive acoustic system for flexible sound attenuation in variable conditions.

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Abstract:The acoustic environment of an event can have detrimental effects on the experience for attendees and its surroundings. Conventional products used for damping or blocking sound, are typically characterised by porous material and noise screens, which are only effective against higher frequency sound. This thesis work has explored alternatives to conventional noise damping solutions, with the aim of being able to transiently dampen specific acoustic frequencies over a wide range. Locally resonant metamaterials yield an interesting prospect with their ability to provide the necessary damping at low frequencies, whilst remaining manageable in size. The electroacoustic absorber is identified as the most suitable resonant structure. The interaction between its acoustic, mechanical and electrical components allow the electroacoustic absorber to adapt its resonant behaviour and dissipate the energy into heat. This results in the desired adaptive frequency attenuation. The electroacoustic absorbers found in literature are elaborated upon by introducing a novel transducer concept, integrating a lightweight construction into an acoustic enclosure, and suggesting the use of an hybrid shunt circuit. The resutls from simulations suggest that the final design has potential, but ultimately needs furhter optimisation to be a suitable product for the events and professional audio sectors.
Item Type:Essay (Master)
Faculty:ET: Engineering Technology
Subject:50 technical science in general
Programme:Industrial Design Engineering MSc (66955)
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