OPNOP
OPNOP is a project whose purpose is to increase knowledge about how different noise generating sources on landing aircraft affect different areas of the ground during the approach.
The project will also increase knowledge about the possibilities of controlling the generation of noise from these sources by flying the aircraft slightly differently with regard to the speed and timing of extension of flaps and landing gear. This could allow noise to either be moved from one geographical area to another during the approach sector, or the noise to be minimized at a specific area on the ground. This is despite the fact that the aircraft continues to fly the same path through the air and over the ground.
The aim of the project will be achieved by using flight data recorded onboard landing planes from to two of the runways at Stockholm-Arlanda Airport. At the same time, the noise on the ground is measured with microphones. Flight data is then matched with noise data from specific flights. Collected data is thereafter analyzed and significant changes in noise levels and frequency spectrum of the noise will be correlated with significant flight-operative events such as selection of flaps or landing gear.
Project OPNOP is based on collaboration with other projects within the Center for Sustainable Aviation. Collaboration takes place through OPNOP taking part in the results of the ULLA project and using developed software from the SAFT project. At the same time, OPNOP assists with flight data for these other projects within the center.
Project members
Vernamack AB