End-Correction in Open Ducts: An Experimental Study AVL List GmbH

Format:

Book

Conference/Event

Author/Creator:

Greco, Andrea, author.

Contributor:

Graf, Bernhard

Conference Name:

12th International Styrian Noise, Vibration & Harshness Congress: The European Automotive Noise Conference (2022-06-22 : Graz, Austria)

Language:

English

Physical Description:

1 online resource cm

Place of Publication:

Warrendale, PA SAE International 2022

Summary:

This paper presents the results of an investigation on the influence of a duct's geometry and shape on its acoustic length, which differs from its physical length by a factor referred to as end-correction. In addition to traditional parameters such as length and diameter, the author has investigated the effect of additional geometry features which are less commonly addressed in the technical literature, such as a diameter contraction or a bent section along the duct. The relative microphone position with respect to the pipe orifice and to the ground surface of the measurement environment has been investigated, showing negligible impact on the measurement results. The sound wave propagation within a pipe featuring a diameter contraction has then been analysed, showing the relationship between the pipe contraction shape and location and the pipe acoustic length. The author has finally investigated the potential effect of a bending in the final section of the pipe, also showing an impact on the pipe effective length

Notes:

Vendor supplied data

Publisher Number:

2022-01-0987

Access Restriction:

Restricted for use by site license