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| Flight Test Investigation of Characteristics of Lateral Attenuation of Civil Aircraft Airworthiness Certification Noise |
| Received:July 06, 2020 Revised:August 06, 2020 |
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| DOI：10.7643/issn.1672-9242.2020.09.032 |
| KeyWord:civil aircraft noise lateral attenuation noise model airworthiness certification flight test |
| Author | Institution |
| SONG Ya-hui |
Chinese Flight Test Establishment, Xi'an , China |
| ZHANG Xiao-liang |
Chinese Flight Test Establishment, Xi'an , China |
| ZHANG Yue-lin |
Chinese Flight Test Establishment, Xi'an , China |
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| Abstract: |
| The paper aims to model the lateral attenuation and study the characteristics of civil aircraft airworthiness certification noise. Through analyzing SAE’s lateral attenuation empirical model, the calculating model of main influencing factors was established. Then the equivalent flight test was designed based on the model and the procedures of lateral attenuation were designed based on test data. The results showed that the lateral attenuation was mainly affected by the sound propagation effects, ground scattering effects and engine installation effects. Sound propagation effects and ground scattering effects had significant influences on high and low elements respectively. The noise directivity difference due to engine installation effects was also a main factor of the lateral attenuation. The prediction results of lateral attenuation model were approximately in agreement with flight test results. But it was necessary to be modified by meticulously designed flight test. The presented equivalent flight test method and the quantum chemical calculation model on lateral attenuation of civil aircraft noise can be applied to low noise design, noise airworthiness certification, and noise pollution calculation around the airport of domestic civil aircraft to service the design and airworthiness certification of domestic civil aircraft. |
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