Moscow State University has proposed a new method for assessing the effect of engine noise on an airframe. This was reported by the press service of Moscow State University.
During flight, the fuselage of an airplane is subjected to intense stress. This applies to both the pressure of the incoming air and the vibrations and oscillations that result from it. In particular, the aircraft is affected by the sound of its own engines, which can have a devastating effect. These problems must be taken into account when designing an aircraft, the effect of sound vibrations is calculated both theoretically and according to the results of tests carried out in a wind tunnel.
MSU experts have conducted theoretical studies in the field of fuselage structure vibrations caused by the acoustic effect of the engine jet, in order to develop methods for reducing the impact of the sonic boom of a supersonic passenger aircraft. To calculate the transfer of acoustic load fields to the elastic finite element model of the body structure, software was developed and the dynamic response of the structure was calculated. As a result, designers can evaluate the strength of the airframe being created, as well as its ability to resist fatigue failure.
These methods are particularly useful in the design of passenger supersonic aircraft. “In world practice of the aircraft industry, it is generally considered that the acoustic load of the gas on the aircraft structure is negligible, resulting in structure vibrations of generally small amplitude. In this case, a linear analysis is sufficient for engineering calculations. However, when considering the creation of a supersonic airliner, part of the fuselage retains the noise of the engine jet and is subjected to much more intense acoustic loads,” explains Dmitry Georgievsky, director of the Supersonic Center.
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