Absorbing Traffic Noise With Bricks Using Helmholtz Resonators

One inevitable aspect of cities and urban life in general is that it is noisy, with traffic being one of the main sources of noise pollution. Finding a way to attenuate especially the low-frequency noise of road traffic was the subject of [Joe Krcma]’s Masters Thesis, the results of which he gave a talk on at the Portland Maker Meetup Club after graduating from University College London. The chosen solution in his thesis are Helmholtz resonators, which are a kind of acoustic spring. Using a carefully selected opening into the cavity, frequencies can be filtered out, and extinguished inside the cavity.

This is a companion discussion topic for the original entry at https://hackaday.com/2023/12/24/absorbing-traffic-noise-with-bricks-using-helmholtz-resonators/