Modeling of Tonal Propeller Noise in Hover Flight

Aleksandra Kvurt
Work towards MSc degree under the supervision of Asst. Prof. Oksana Stalnov (Technion)
Department of Aerospace Engineering
Technion – Israel Institute of Technology

Global interest in urban air mobility and multi-rotor unmanned aerial systems is rapidly growing. The acoustic signature of these vehicles is of great concern to the public. Tonal noise is attributed to the steady aerodynamics loads, on the one hand, and to their periodic variations, called blade loading harmonics, on the other hand. Analytical modelling of rotor tonal noise components is based on the acoustic analogy that relies on a three-step approach: prediction of (i) steady aerodynamic loads, (ii) blade loading harmonics, and (iii) tonal noise components. In the current study, aerodynamic loads and tonal noise components were modelled and compared with experiments conducted in the newly established anechoic chamber at the Faculty of Aerospace Engineering at the Technion. The aerodynamic loads, rotational frequency, and the corresponding acoustic signature were acquired simultaneously. The proposed semi-empirical approach was validated for predicting aerodynamic performance, noise radiation levels, and directivity. In the future, this work can be helpful for manufacturers and town planners that will be required to predict and monitor the noise levels in the urban soundscape. Therefore, noise prediction tools must be considerably improved to substantially reduce noise emission levels.

The talk will be given in English

Mon, 05-09-2022, 13:30-14:30 (Gathering at 13:30)

Classroom 165, ground floor, Library, Aerospace Eng. +

Light refreshments will be served before the lecture

Modeling of Tonal Propeller Noise in Hover Flight