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
Related Articles
- EP ID EP659471
- DOI -
- Views 51
- Downloads 0
CALCULATION OF THE REINFORCED ELEMENTS IN ONE-SIDED EXPANSION BY USING NONLINEAR CONCRETE CREEP EXTENTION
Purpose. The article investigates a reinforced concrete element of a rectangular profile, hardened in the stretched zone by upbuilding, using a nonlinear deformation model taking into account nonlinear sustained processe...
STRUCTURAL PROPERTIES OF POROUS SILICON RECEIVED BY ELECTRIC CHEMICAL CONTROL METHOD
Purpose. To investigate the change in PS morphology, to investigate the formation of pores and ‘‘porous silicon’’ for a wide spectrum of potential applications since the discovery of the unexpected optical properties...
DEVELOPMENT OF HIGH-SENSITIVE HYDROGEN SENSORS OF SCHOTTKY DIODES BASED ON n-GaAs NANO LAYERS
Purpose. To research porous semiconductor materials which have unique chemical and physical properties due to their extremely small size and large surface-to-volume ratio, so they open up alternative possibilities for th...
MODIFICATION OF THE FORMS OF SERVICES PROVIDED BY HIGHER EDUCATION ESTABLISHMENTS
Purpose. The problems of the development of higher education are related to the activity of higher education establishments that are the basic link of the education process. The changes in the exter...
APPLICATION OF POROUS GaAs IN THE MANUFACTURE OF SCHOTTKY DIODES
Purpose. To study the electrical properties of Pd / por-GaAs / n-GaAs. It is of great interest since the efficiency of porous electronic devices based on GaAs is expected to increase. The electrochemistry of Si (and of o...