Influence of wall vibrations on the sound of brass wind instruments

Kausel, Wilfried; Zietlow, Daniel W.; Moore, Thomas R.

doi:10.1121/1.3493457

Cited by 21 publications

(27 citation statements)

References 19 publications

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“…If the elephant bell did not have inter-tine gaps it would just be another convex bell with symmetry group C 1v and subject to the same consequences. 4 The vibrational patterns of Indian elephant bells are similar to those of trumpet bells, 5 bells, 6 and gongs. 7 Thus, the normal modes would occur in degenerate pairs with modal a) Author to whom correspondence should be addressed.…”

Section: A the Unperturbed Bellmentioning

confidence: 70%

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Normal modes of the Indian elephant bell

Perrin

Chalmers

Elford

et al. 2012

The Journal of the Acoustical Society of America

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The geometrical structure of the Indian elephant bell is presented and the requirements on its normal modes from group representation theory are described. These are in good agreement with the results of a finite-element model (FEM) for a specific 16-tine case. The spectrum consists of a sequence of families of modes lying on saturation curves, completely different from those of conventional bells. Physical explanations for the occurrence of these families are presented in terms of the tines behaving as a closed loop of coupled cantilevers with constraints from the dome. Each family is found to consist of modes in one of two specific sequences of symmetry types. Experimental measurements of the modes of this same 16-tine bell, using electronic speckle pattern interferometry (ESPI), have been made and are compared with the FEM predictions. Although the interpretation of the interferograms is difficult in all but the simpler cases, agreement in terms of frequencies is surprisingly good for the first few family sequences. The ESPI study also showed up numerous harmonics and subharmonics of true normal modes, showing the system to be rather nonlinear and making comparisons with the FEM results tricky.

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Section: A the Unperturbed Bellmentioning

confidence: 70%

“…5,15 The ESPI system used is described in detail in Ref. 16 and operates by imaging out-of-plane vibrations by digitally subtracting a speckle pattern interferogram of an object illuminated by coherent radiation before the object begins to vibrate, from one imaged subsequent to its movement.…”

Section: Methodsmentioning

confidence: 99%

Normal modes of the Indian elephant bell

Perrin

Chalmers

Elford

et al. 2012

The Journal of the Acoustical Society of America

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“…Moore's stance does seem to be the more popular, however, with the likes of Nief (2008) offering concurrent, albeit muddled, findings supporting the connection between wall vibrations and timbre. Kausel (2010) offered more robust support, claiming that, whilst the aetiology of the bell's impact is largely unknown, the findings of their research indicate that the 'majority of audible effects' are a direct result of the 'presence of strain oscillations' in the bell and their interaction with the air column of the instrument.…”

Section: Timbre and The Bellmentioning

confidence: 93%

Considerations for the Design of Composite 3D Printed ‘Intermediate Level’ Trumpets

Gibson

Spry

Pope³

2017

Electronic Workshops in Computing

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Using 3D printing techniques, it is now possible to create almost any small to medium object including brasswind instruments. However, creating a competitive brasswind instrument requires a different approach to conventional 3D printing -demanding specialised printing techniques which, up to now, have only been applied to the prototyping stage. This paper is a review of the considerations in the design process for a composite B♭ trumpet aimed at the intermediate level player. The trumpet is the next step up from introductory level instruments such as the pTrumpet or Tromba. As such, it must be comparable to brass equivalents available from manufacturers such as Vincent Bach, Getzen, and Yamaha. The acceptance of such an instrument is as important as the design therefore composite instruments would need to have 'added value' compared to their brass counterparts if they are to be successful in the marketplace.

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“…Recently Wilfried Kausel, Daniel Zietlow, and Thomas Moore have undertaken systematic studies of wall-vibration effects in brass instruments, 13 using an artificial lip excitation source and an experimental arrangement that allows the wall vibrations to be damped by sand (figure 4). They found that damping the wall vibrations resulted in severaldecibel increases in the first few harmonics of the radiated sound, along with reductions in the amplitudes of higher harmonics.…”

Section: Must Brass Instruments Be Made Of Brass?mentioning

confidence: 99%