Modelling noise barrierEnvironment
From acoustics simulation capabilities, environmental protection remains one of the most valuable application. Modelling noise barrier in oceans, by roads or next to housing areas is very important to help find the right design and installation instructions.
Objectives from modelling noise barrier
In this case study, construction of an underwater noise barrier has been simplified through the use of acoustics simulation to compare different configurations of the barrier.
It is made of non-organic porous materials that have high damping characteristics for sound waves.
The barrier, aimed at protecting marine wildlife from construction work on the seashore, is modelled with a poroacoustics equation. The study compared two of them: Delany-Bazley-Miki and Zwikker-Kosten. Both gave similar results on a frequency range 200 to 1000 Hz.
Results from simulation and information extracted
The simulation objective was to minimise the consumption of raw materials and keep an efficient noise attenuation.
Results indicate that one configuration can use twice less raw material than the original one and still be as efficient.
Finally, another simulation scenario was investigated. One wanted to know what would happen if several elements of the barrier collapsed, creating a hole inside it. Simulation showed from which hole size (corresponding to a number of elements) this failure would have an impact. It confirmed the robustness of the barrier for sound attenuation.
Modelling initial noise barrier
The images show the sound wave that propagates until it is blocked by the designed barrier.
Visualisation of the barrier in grey, and of the wave in blue to red colours for minimal to maximal peaks.
Modelling final noise barrier
The second barrier: as efficient as the first one with twice less raw material.
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