Aero engine manufacturers conduct very sophisticated test procedures to evaluate and minimise the noise generated by the engines
Aircraft noise emission has been the subject of much discussion, debate and government legislation in recent years. Aero engine manufacturers conduct very sophisticated test procedures to evaluate and minimise the noise generated by the engines. For these tests to be effective, they must take place under standardized conditions of ambient humidity and temperature in the test zone
The tests are split into two specific areas:
The noise generated by the spinning of the engine components, turbine blades, bearings, etc is tested in a passive mode by rotating the engine in an anechoic chamber. This is a totally sound insulated chamber which produces no internal reflection of sound and measures the pure sound generated by rotation of the engine. The rotation is affected by an external controlled motor.
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