9 Applications of 3D Scanning Laser Doppler Vibrometry to an Article with Internal Features 95 Fig. 9.12 Axial and torsion mode shape comparison from roving hammer and 3D LDV tests 9.7 Conclusions Traditional roving hammer impact testing can be useful by minimizing mass loading of test articles when compared with the alternative of fully instrumenting a test article with accelerometers. However, it was found that a far better alternative for some applications is to utilize 3D scanning LDV measurements with impact excitation to practically eliminate mass loading all together. Addition of non-contact 3D measurements allowed for internal feature motion inferences, correct shape interpretations, and eliminated need for multiple test article configurations which, in this case, resulted in erroneous initial results. Reference 1. Hensley, D.P., Mayes, R.L.: Extending SMAC to multiple references. In: Proceedings of the 24th International Modal Analysis Conference, pp. 220–230, February 2006
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