Microphone array measurements of concert grand piano soundboards in different stages of production

2016 ◽  
Vol 140 (4) ◽  
pp. 3317-3317
Author(s):  
Niko Plath ◽  
Florian Pfeifle ◽  
Christian Koehn ◽  
Rolf Bader
Keyword(s):  
Microphone Array ◽  
Array Measurements ◽  
Grand Piano

scholarly journals Aeroacoustic noise reduction by application of end plates on wall-mounted finite airfoils

2021 ◽  
Vol 62 (5) ◽  
Author(s):  
Erik Schneehagen ◽  
Thomas F. Geyer ◽  
Ennes Sarradj ◽  
Danielle J. Moreau
Keyword(s):  
Noise Reduction ◽  
Microphone Array ◽  
Boundary Layer Transition ◽  
Tip Vortex ◽  
Layer Transition ◽  
Aeroacoustic Noise ◽  
End Plate ◽  
Array Measurements ◽  
Field Noise ◽  
Naca 0012

Abstract One known method to reduce vortex shedding from the tip of a blade is the use of end plates or winglets. Although the aerodynamic impact of such end plates has been investigated in the past, no studies exist on the effect of such end plates on the far-field noise. The aeroacoustic noise reduction of three different end-plate geometries is experimentally investigated. The end plates are applied to the free end of a wall-mounted symmetric NACA 0012 airfoil and a cambered NACA 4412 airfoil with an aspect ratio of 2 and natural boundary layer transition. Microphone array measurements are taken in the aeroacoustic open-jet wind tunnel at BTU Cottbus-Senftenberg for chord-based Reynolds numbers between 75,000 and 225,000 and angles of attack from 0$$^\circ$$ ∘ to 30$$^\circ$$ ∘ . The obtained acoustic spectra show a broad frequency hump for the airfoil base configurations at higher angles of attack that is attributed to tip noise. Hot-wire measurements taken for one configuration show that the application of an end plate diffuses the vorticity at the tip. The aeroacoustic noise contribution of the tip can be reduced when the endplates are applied. This reduction is most effective for higher angles of attack, when the tip vortex is the dominant sound source. Graphic abstract

scholarly journals Combining asynchronous microphone array measurements for enhanced acoustic imaging and volumetric source mapping

2021 ◽  
Vol 182 ◽  
pp. 108247
Author(s):  
Lourenço Tércio Lima Pereira ◽  
Roberto Merino-Martínez ◽  
Daniele Ragni ◽  
David Gómez-Ariza ◽  
Mirjam Snellen
Keyword(s):  
Microphone Array ◽  
Acoustic Imaging ◽  
Array Measurements

scholarly journals Microphone-Array Measurements in a Cryogenic Wind Tunnel

AIAA Journal ◽  
2010 ◽  
Vol 48 (7) ◽  
pp. 1470-1479 ◽  
Author(s):  
Thomas Ahlefeldt ◽  
Lars Koop
Keyword(s):  
Wind Tunnel ◽  
Microphone Array ◽  
Array Measurements ◽  
Cryogenic Wind Tunnel
Sign in / Sign up

Export Citation Format

Share Document