Earticle

초록

영어

Blade angle adjustment is one of the few noise-control measures available to operators of light sport aircraft fitted with ground-adjustable propellers, because engine speed cannot be lowered freely without penalising take-off performance. Reducing noise by changing the blade angle, however, also changes static thrust, so the two effects must be weighed together. This study converts A-weighted sound pressure levels and static thrust measured on a Rotax 914 UL powered light sport aircraft into a single evaluation index. A specific noise level, defined as the A-weighted level minus ten times the common logarithm of static thrust, is introduced, together with an exchange rate expressing noise reduction per unit of thrust loss. Four blade angles from 14 to 20 degrees were examined at three engine speeds. At the take-off setting the specific noise level was lowest between 16 and 18 degrees, while the 16 degree setting gave the highest exchange rate at 0.46 dB(A) per one percent of thrust loss. At the cruise setting only the 14 degree case reduced noise, at a markedly lower exchange rate. The results provide a numerical basis for selecting blade angles at training aerodromes where noise complaints are frequent.

목차

Abstract
1. 서론
1.1 연구 배경
1.2 선행연구 검토
1.3 연구 목적 및 범위
2. 이론적 배경 및 평가 지표
2.1 깃각과 회전수의 작용
2.2 소음-추력 상충관계 지표의 정의
3. 측정 개요 및 결과
3.1 대상 및 계측 장비
3.2 측정 조건
3.3 주파수 대역 특성
3.4 깃각별 소음 및 추력
4. 상충관계 분석 및 운용구간 도출
4.1 비소음레벨 산출
4.2 교환율 분석
4.3 운용구간 제안
5. 결론
References

키워드

저자

• 류종현 [ Jong-Hyeon Ryu | Member, Professor, Dept. of Flight Operation, Hanseo University ]
• 김세준 [ Se-Jun Kim | Member, Professor, Dept. of Liberal Studies in Natural Sciences, Hanseo University ] Corresponding Author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  한국기계항공기술학회 학술대회논문집(구 한국기계기술학회 학술대회논문집) [Proceedings of KSMT Annual Meeting]

• 간기

  부정기

• 수록기간

  2000~2026

• 십진분류

  KDC 550 DDC 620