IMPROVING THE COMPONENT ASSESSMENT AIRCRAFT NOISE FOR THE CASE OF ITS RADIATION IN THE BACK SECTOR
Journal Title: Вісник Кременчуцького національного університету імені Михайла Остроградського - Year 2017, Vol 1, Issue 103
Abstract
Purpose. To improve the aircraft noise directivity function, which is used in the simulation of aircraft noise levels, by determining approximations of this function to suit different types of aircraft engines. Methodology. The mathemat- ical modeling for evaluating levels of aircraft noise taking into account the amendment in the back sector for different groups of aircraft has been used. Results. For takeoff operations at departure and at arrival, the correction of radiation in the rear sector is calculated according to the same dependence for any category of aircraft in accordance with ICAO document DOC 9911. However, each category of aircraft has its own peculiarity and this fact must be taken into ac- count when calculating the radiation in the rear sector. The software system has been offered by means of which exper- imentally typical amendments for calculating the radiation in the rear sector for the main five weight classes aircraft was obtained. Originality. The fourth-order dependences for the air noise emission direction function in the rear sector are obtained for the following aircraft categories: Jumbo, Heavy, Large, Regional Jet, Propeller. Practical value. It has been proved experimentally that for different types of engines the correction of radiation in the rear sector is changed and significantly is different from the equation, which is proposed in the document ICAO DOC 9911. Namely different fourth-order equations for each type of engine instead a single second-order equation that describes any type of engine have been offered. References 10, figure 17.
Authors and Affiliations
О. Zaporozhets, L. Levchenko
Keywords
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