Active Control of Impact Noise, A study on the reduction of the radiated sound power resulting from an impact between a sphere and a plate

Examensarbete för masterexamen

Please use this identifier to cite or link to this item: https://hdl.handle.net/20.500.12380/247659
Download file(s):
File Description SizeFormat 
247659.pdfFulltext1.01 MBAdobe PDFView/Open
Type: Examensarbete för masterexamen
Master Thesis
Title: Active Control of Impact Noise, A study on the reduction of the radiated sound power resulting from an impact between a sphere and a plate
Authors: Passanesi, André
Abstract: Impacts are an important noise source of today’s society. From a control standpoint, solutions to problems related to impacts are commonly based on passive methods. In this paper, an active method to control the radiated sound from a sphere impacting a simply supported plate attached to an infinite ba˜e is proposed. The contact force between sphere and plate is modeled by Hertzian contact, this force is then convoluted with the plate’s impulse response. From this, the radiated sound field is calculated by the Rayleigh integral in the time domain. In a following step, an active force is used to act on the plate with the purpose of minimizing the radiated sound power. This control force is estimated using a method based on the LMS algorithm formulated in the time-domain. For di˙erent positions of the impact between the sphere and the plate, the position of the active force is varied and for each case, the LMS algorithm obtains the optimal time record of the force. For non-trivial cases, where the acting force is not in the same position as the impact, results present reductions of up to 13 dB in the simulations of the radiated sound power.
Keywords: Building Futures;Akustik;Building Futures;Acoustics
Issue Date: 2016
Publisher: Chalmers tekniska högskola / Institutionen för bygg- och miljöteknik, Teknisk akustik
Chalmers University of Technology / Department of Civil and Environmental Engineering, Applied Acoustics
Series/Report no.: Examensarbete - Institutionen för bygg- och miljöteknik, Chalmers tekniska högskola
URI: https://hdl.handle.net/20.500.12380/247659
Collection:Examensarbeten för masterexamen // Master Theses



Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.