The design of the engine intake and exhaust can do a lot to reduce noise levels.
there not
No Aircraft Noise ended in 1999.
No Aircraft Noise was created in 1995.
Henry A. Kumasaka has written: 'Definition of 1992 technology aircraft noise levels and the methodology for assessing airplane noise impact of component noise reduction concepts' -- subject(s): Aircraft noise, Noise spectra, Transport aircraft, Noise reduction, Jet aircraft
during flight aircraft reduce speed by spoiler
No.
Myles Simpson has written: 'Anaylsis of interior noise ground and flight test data for advanced turboprop aircraft applications' -- subject(s): Control systems design, Noise reduction, Aircraft compartments, Aircraft noise, Turboprop engines, Turboprop aircraft, Ground tests, Engine noise 'Noise barrier design handbook' -- subject(s): Traffic noise, Absorption of sound, Highway planning, Noise control
C. G. Bottom has written: 'A social survey into annoyance caused by the interaction of aircraft noise and traffic noise' 'A survey into the annoyance caused by aircraft noise and road traffic noise'
R. Vaicaitis has written: 'Design of sidewall treatment for cabin noise control of a twin engine turboprop aircraft' -- subject(s): Noise, Airplanes, Acoustical engineering 'Experimental study of noise transmission into a general aviation aircraft' -- subject(s): Noise control, Aircraft cabins
Joe W. Hough has written: 'Aircraft noise prediction program (ANOPP) fan noise prediction for small engines' -- subject(s): Noise spectra, Jet engines, Noise prediction (Aircraft)
Aircraft make noise any time they fly. They make less noise at night because airports have published "noise abatement" procedures pilots follow to keep the people who live around airports happy.
By streamlining the aircraft.