Airplane noise. Aircraft noise level

Noise is a very important issue in aviation. Noise abatement is second in importance after the safety oversight. Before the advent of aircraft Jet engine major airports takes about 10 aircraft per day. Today, that number has increased to several hundred. Landing and takeoff of aircraft performed almost every minute. This factor, together with the increase in population density, the number of airports and their location near the cities aggravates the problem of noise control. Passengers are also affected by aircraft noise. The noise level of modern jet aircraft during takeoff is 130-140 decibels.

Such noise can cause a person pain, because this is the magnitude of the threshold of endurance of the human ear. And in the cockpit of a modern aircraft noise sometimes reaches 100 dB, which breaks comfort, prevents passengers from resting and talking. The requirement for noise level is one of the main criteria for creating airliners. The international airport will not accept the modern airplane for anything if it does not meet the noise standards. Before the creators of the first passenger aircraft put the main task of reducing the noise level in the cabin. The appearance of the first jet engines contributed to the reduction of noise, but it increased on the ground with the landing and take-off of the aircraft.

How to reduce the noise level of the aircraft

The layout of aircraft with dual-circuit engines and installation of sound-absorbing facings in power plants somewhat reduced the "inconvenience" of aircraft on the ground. But these activities are not enough. To protect people from the noise presented by the operation of aviation equipment, various measures are being taken. For example, it is prohibited to erect near houses. New methods of landing and take-off are being developed, airspace is rationally used. But the main task of aircraft designers is to create a "quiet" aircraft. To solve this problem, it requires an investment of considerable financial resources. Based on the assessment of foreign firms, reducing the intensity of noise by half requires about 200 thousand rubles per aircraft. And to reduce noise in 4 times you need 600 thousand rubles! Therefore, reducing the noise of the entire aircraft fleet costs a lot of money.

Since noise generally produces engineThe greatest attention is paid to him. A large proportion of the noise comes from the jet gases. Therefore, the nozzle jet makes corrugated and create on their heads. The second option to reduce noise power plants - installation of special rods and nets. Around rips jet proposes the creation of a sound insulating shell and use a third-party source of the noise, to repay the principal.

Many modern aircraft engines are equipped with sound-absorbing lining of internal channels. It is represented by perforated plates, which are placed at a short distance from the rigid wall. The space between the wall and the plates is filled with honeycomb core. To reduce the noise level in the cockpit, soundproof and sound-absorbing materials are used. They are placed between the interior panels of the salons and cladding in several layers.