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Analysis of elastic waves from two-point strain measurement: strain, particle velocity, power transmission and related quantities can be determined at an arbitrary section of a cylindrical rod from measurement of strains at two different rod sections
Luleå tekniska universitet.
Institut CERAC.
1977 (English)In: Experimental mechanics, ISSN 0014-4851, E-ISSN 1741-2765, Vol. 17, no 6, p. 213-218Article in journal (Refereed) Published
Abstract [en]

Provided that the one-dimensional wave equation applies, strain measurement at two sections of a linearly elastic cylindrical rod makes it possible to determine a number of important quantities at an arbitrary section of the rod; for example, strain, particle velocity and power transmission. The equations needed are derived, and the design of an analogue real-time analyzer is presented. The influence of some principal sources of error is analyzed and it is shown that it should be possible to perform accurate evaluation (errors less than a few percent) during a time interval which is not very long compared to the travelling time for a wave between the two gage positions. Comparisons are made between direct measurement and digital evaluation of strain, and between digital and analogue evaluation of particle velocity and power transmission. The discrepancies are typically less than ten percent during a time interval of 20 travelling times between gages. Although these results do not represent what is achievable, the accuracy is sufficient in several applications and demonstrates the feasibility of the method used.

Place, publisher, year, edition, pages
1977. Vol. 17, no 6, p. 213-218
National Category
Applied Mechanics
Research subject
Solid Mechanics
Identifiers
URN: urn:nbn:se:ltu:diva-3323DOI: 10.1007/BF02324491ISI: A1977DG52700003Scopus ID: 2-s2.0-0017505664Local ID: 122cc850-04b5-11de-802a-000ea68e967bOAI: oai:DiVA.org:ltu-3323DiVA, id: diva2:976180
Note
Godkänd; 1977; 20090227 (bajo)Available from: 2016-09-29 Created: 2016-09-29 Last updated: 2018-07-10Bibliographically approved

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