Aircraft Noise Trajectories

Flight trajectories are fully synchronised with the aircraft noise model and the signal analysis module, that performs calculations such as atmospheric absorption, ground effects (including refraction), wind and temperature effects (including wind directions).

Synchronisation is performed through a vector of parameters that includes the aircraft state, the control switches for landing gear and high-lift surfaces deployment/retraction, and all the atmospheric conditions.

A feature lets the user operate with either self-generated trajectories or external trajectories, so that the aircraft model can be coupled with other databases. The aircraft and receiver coordinates can be either absolute or GPS coordinates (latitude, longitude, heading, etc).

On output, the FLIGHT software provides the noise contribution of all the active components (airframe and propulsion elements).

 

Noise Trajectory for the Bombardier Dash8-Q400

This example refers to the noise trajectory at landing for the Bombardier Dash8-Q400 with PW150A turboprop engines and Dowty R408 propellers. The figure shows the simulated and measured OASPL(dB) at a community microphone during an approach trajectory.

Figure showing the simulated and measured OASPL(dB) at a community microphone during an approach trajectory

Simulated and measured OASPL(dB) during an approach trajectory

 

Noise Trajectories for the Boeing B737-800

The following video clips show the effects on the ground of multiple aircraft movements (arrival and departure). The noise metric plotted is the instantaneous OASPL (overall sound pressure level). The movements are separated by 90 seconds.

Takeoff model for a Boeing 737-800

Take-off model for the Boeing B737-800

Landing model for a Boeing 737-800

Landing model for the Boeing B737-800