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A Dynamic Ptotoelastic Study of Flexural Wave Generation in a Model of Percussive Drilling
Luleå tekniska universitet.
1983 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 86, no 2, p. 243-252Article in journal (Refereed) Published
Abstract [en]

The development of the percussive drilling machine has led to a situation where the drill steel itself has become a major noise source. A qualitative theory for the generation of this noise is presented. In this theory the longitudinal drilling pulse is partially converted to flexural motion by non-symmetric boundary conditions. The technique of stress optics combined with high speed photography is used in conjunction with Araldite models of the drill steel to verify the above conjectures. The models are then used to demonstrate the importance of the clamping conditions in preventing the growth of noise producing motions of the drill steel. It is also shown that the Araldite models give a reasonable representation of the stress wave pattern in a true drill steel, at least for the time period associated with the first few passes of the primary stress wave pattern and its reflexions.

Place, publisher, year, edition, pages
1983. Vol. 86, no 2, p. 243-252
National Category
Fluid Mechanics and Acoustics
Research subject
Fluid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-10769DOI: 10.1016/0022-460X(83)90752-6ISI: A1983QB37400007Scopus ID: 2-s2.0-0020590165Local ID: 99f8d720-a4cb-11db-8975-000ea68e967bOAI: oai:DiVA.org:ltu-10769DiVA, id: diva2:983716
Note
Godkänd; 1983; 20070115 (ysko)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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