DARcorporation engineers have the ability to analyze the Sound Pressure Level (SPL) field, on and surrounding an aircraft, propeller or any object. SPL is used for the following:

A generic antenna radome on a twin engine aircraft is shown as an example for analyzing SPL. The SPL is used to determine if the unsteady fluctuation from the radome is a cause for concern to fatigue life, for example. Detached Eddy Simulation (DES) unsteady analysis is used to capture downstream effect and airflow turbulence frequency from the radome. Computational Fluid Dynamic (CFD) simulation of the radome determines detailed vorticity and pressure distributions that provide root mean square fluctuations loads. Time history pressure fluctuations is used to determine the SPL vs Frequency where the Overall Sound Pressure Level (OASLP) is calculated. The OASPL is a measure of the overall acoustic noise intensity, which is used in determining the severity of the acoustic noise.

This same methodology can be used to determine external noise which is crucial during aircraft design, such as evaluating UAM vehicle noise signature. It can also be used to determine whether an aircraft breaches any airport noise ordinance.