University of Surrey

Test tubes in the lab Research in the ATI Dance Research

Impulse measurements on tubular acoustic systems.

Watson, Andrew Philip. (1989) Impulse measurements on tubular acoustic systems. Doctoral thesis, University of Surrey (United Kingdom)..

Full text is not currently available. Please contact sriopenaccess@surrey.ac.uk, should you require it.

Abstract

This thesis investigates the transient measurement and analysis of brass musical instruments. The experimental apparatus of Deane (1986) has been substantially revised and developed to allow accurate determination of the input impulse response of instruments up to 8kHz. The inverse problem of calculating the bore of an instrument from its impulse response has been studied with good success. The bores of trumpets have been accurately determined to within 0.1mm up to the bell section where the flare is too great for the algorithm to be valid. Further developments have been made to the application of transient measurements to the manufacturing environment. The apparatus has been shown to detect valve misalignments as small as 0.25mm. A modified apparatus has been developed to allow determination of the input impedance of instruments from transient measurements. The shape of the calculated impedance curves show good agreement with measurements made in the frequency domain although absolute calibration shows errors related to truncation of the transient responses. The internal field of a French Horn bell is studied with the results presented in a series of space-time and space-frequency diagrams. This technique allows detailed examination of the shape of an impulse travelling through the horn. Finally, the relationships between impedance, impulse response and bore have been analysed to form the foundations of a Computer Aided Design technique for brass instruments.

Item Type: Thesis (Doctoral)
Divisions : Theses
Authors :
NameEmailORCID
Watson, Andrew Philip.
Date : 1989
Depositing User : EPrints Services
Date Deposited : 09 Nov 2017 12:16
Last Modified : 09 Nov 2017 14:44
URI: http://epubs.surrey.ac.uk/id/eprint/843862

Actions (login required)

View Item View Item

Downloads

Downloads per month over past year


Information about this web site

© The University of Surrey, Guildford, Surrey, GU2 7XH, United Kingdom.
+44 (0)1483 300800