Project cost ($):
1 hour to prepare, 2 day for experiment
Easily found. You can obtain a decibel meter from Radioshack at around US$50
The area around the airport will have tight security checks and safety requirements. Please ensure that you obtain proper clearance from airport authorities if the selected location is too close to the airport. Please wear proper ear protection
Table of Contents
This experiment was done to compare the noise levels generated by an aircraft during take off and landing.
An aircraft will make more noise during take off than during landing.
Type of aircraft noise
Aircraft noise can be heard during the taxi stage (aircraft moving on runway), take off, when the aircraft is flying overhead and when it is landing. The noise from an aircraft is amounts to noise pollution than can be a great nuisance and cause health problems for residents living close to an airport. The types of noise generated by an aircraft are listed below:-
Noise due to aerodynamics is caused by the flow of air across the surface of the airplane. The air flow causes the extremely rapid compression and expansion of the surrounding air resulting in noise. This noise will increase as the aircraft speed increases. It will also be higher pitched at lower altitudes due to higher air pressure.
Noise from jet engines is the main source of noise during take off and landing. The noise from a jet engine is proportional to the speed at of the jet during take off and landing.
Aircraft system noises are noises that origin within the cabin and the cockpit of the aircraft. This noise is from the power unit which generates the power to start the aircraft engines and provide the electricity to operate the electronics inside the aircraft.
Aerodynamics, compression, expansion, airflow, decibel meter
The materials required for the experiment:
The results show that the aircraft will generate more noise during take off as compared to during landing. The noise levels are also different for different types of aircraft. The Cessna 206 was the loudest and the Airbus 300 was the quietest aircraft.
Use the below graph to plot the results in the above table.
The hypothesis that aircraft will generate more noise during take off rather than during landing is proven to be true. The noise during take off is about 10 to 12 dB louder than the noise generated during landing.
The experiment can be repeated by taking the measurement at night.
Aircraft noise - http://en.wikipedia.org/wiki/Aircraft_noise