Discrete Noise Prediction of Small-Scale Propeller for a Tactical Unmanned Aerial Vehicle

Ryu, Ki-Wahn

doi:2018.21.6.790

J. KIMS Technol > Volume 21(6); 2018 > Article

Research Paper

Journal of the Korea Institute of Military Science and Technology 2018;21(6):790-798.
DOI: https://doi.org/10.9766/KIMST.2018.21.6.790

Discrete Noise Prediction of Small-Scale Propeller for a Tactical Unmanned Aerial Vehicle

Ki-Wahn Ryu

Department of Aerospace Engineering, Chonbuk National University

소형 전술급 무인항공기 프로펠러의 이산소음 수치해석

유기완

전북대학교 공과대학 항공우주공학과

Abstract

Discrete noise signals from a small scale tactical unmanned aerial vehicle(UAV) propeller were predicted numerically using time domain approach. Two-bladed 29 inch propeller in diameter and 150 kgf in gross weight were used for main parameters of the UAV based on the actual size of the similar scale vehicle. Panel method and Farassat formula A1 were adopted for aerodynamic and aeroacoustic analysis respectively. Time domain signals of both thickness and loading noises were transformed into frequency domain to analyze the discrete noise characteristics. Directivity pattern in a plane perpendicular to the rotating disc plane and attenuation of noise intensity according to double distance were also presented.

Key Words: Tactical UAV, Propeller Noise, Acoustic Analogy, Directivity Pattern, Panel Method