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Title: Investigation of the lip reed using computational modelling and experimental studies with an artificial mouth
Author: Richards, Orlando
Awarding Body: University of Edinburgh
Current Institution: University of Edinburgh
Date of Award: 2003
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To investigate the lip reed, artificial mouths have recently been employed to facilitate scientific study of the behaviour of the reed. These devices model the human lips using natural latex rubber tubes filled with water. This study uses one such device to experimentally investigate the relationships between the resonances of the reed and the resulting self-sustained oscillation when driving an acoustic resonator - a trombone in this case. The resonances of the reed are initially investigated by measuring the area of opening between the lips as they are driven by a known oscillating acoustic signal. Additionally, the resonances of the reed are investigated in two dimensions using a laser doppler vibrometer.  Motion of the lips in two dimensions is analysed using a high speed digital video camera. Using these results, computational investigations of lip models provide a great deal of insight into the basic mechanics of the reed. Linear stability analysis shows that a model with at least two degrees of freedom is required to reproduce experimentally observed threshold playing frequencies. Time domain simulations are used to investigate the response of the models, and comparisons are made with the experimentally obtained response data. Strong similarities are found between the area of opening function of a two degree of freedom model and the area function recorded in experimental studies, when the opening area is described by an appropriate non-linear functions of the reed position. These results greatly improve the understanding of the merchants of the lip reed, and pave the way for the development of fully capable physical sound synthesis models.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available