There are two kinds of the receiver probes on the fighters and attack aircraft for the probe-and-drogue refueling systems. The first is fixed one, with the probe protruded and fixed outside the airplane, such as the probes on French 'Mirage 2000'. The second is retractable one, with the probe extended out while refueling, and then retracted back, such as the probe on the Russia fighter 'Su-30'. The mechanism for the retractable probe is so complex that it is only used on the most advanced airplanes. The fixed receiver probe is used on many military airplanes, but it will induce additional cabin noise more or less compared with the aircraft without the probe. If it isn't designed in right way, the installation may induce serious noise or vibration to the aircraft, especially when adding such system on existing aircraft. This paper deals with the control of cabin noise induced by air refueling pipe using both the shape optimisation of the air refueling pipe and active noise control in the headpiece, and the pipe shape optimisation also improved the structure vibration. The results show that using pipe shape optimisation, the structure vibration is reduced to 55,7 % of the originated one, the cabin noise is reduced by 8.3 dB. Using both the pipe shape optimisation and the active noise control, noise sensed by the pilot is reduced by 16.6 dBA.
Comprehensive control of cabin noise induced by air refueling pipe using shape optimization and active noise control
Umfassende Regelung des durch dei Betankungsvorrichtung bei Kampfflugzeugen induzierten Kabinengeräusches durch Formoptimierung und aktive Geräuschregelung
2002
5 Seiten, 10 Bilder
Aufsatz (Konferenz)
Englisch
Active control of aircraft cabin noise
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