Abstract

VARI, L.M.  and  HEYNS, P.S.. Strain modal testing - a critical appraisal. R&D j. (Matieland, Online) [online]. 1997, vol.13, pp.83-90. ISSN 2309-8988.

In performing modal tests it is conventional to measure either, acceleration, velocity or displacement as a response quantity. However, research indicates that modal testing based on strain measurement, appropriately termed strain modal testing (SMT), may provide the analyst with significant advantages such as modal testing efficiency improvement and condition monitoring benefits. Equipment requirements for SMT are however found to be less favourable than for conventional displacement modal testing. It may also be shown that the theory underlying SMT brings about fundamental changes in the nature of the data acquired and the ensuing analysis procedures. This paper critically assesses SMT and its potential applications and concludes that the analyst could benefit significantly from its judicious employment. SMT provides valuable additional information compared to displacement modal testing and should be employed complementary to conventional modal testing.

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