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Experimental facilities for modal testing

Everaldo de Barros (Integration and Tests Division, Institute of Aeronautics and Space, São José dos Campos, Brazil)
Fernando Juliani (Integration and Tests Division, Institute of Aeronautics and Space, São José dos Campos, Brazil)
Leandro Ribeiro de Camargo (Offshore Well Construction and Maintenance, Petróleo Brasileiro S.A., Santos, Brazil)

Aircraft Engineering and Aerospace Technology

ISSN: 0002-2667

Article publication date: 6 March 2017




The experimental modal analysis requires good knowledge of various engineering fields, such as mechanical vibrations, transducers used in vibration measurement, transducers and system calibration methods, data acquisition systems, digital signal processing and system identification. Test facilities constitute a key factor for improving the quality of the estimated modal model. This paper aims to describe the experimental facilities at the Institute of Aeronautics and Space (IAE) Modal Testing Laboratory in terms of associated instrumentation and data acquisition system, metrological aspects and computational resources. The discussion is completed with a practical application showing a ground vibration testing (GVT) of an unmanned aerial vehicle (UAV).


The experimental facilities were evaluated in a typical GVT, using three shakers in both vertical and horizontal excitations and 88 response measurement points. The global excitation method was used to excite all desired modes. The reliability of the experimental modal model was validated by an auto modal assurance criterion matrix for the measured modes of the structure.


The experimental facilities were successfully used for validating the dynamical characteristics of the UAV under testing.


The modal test facilities of the Modal Testing Laboratory at the IAE, the main research center of the Brazilian Air Force, are described in this paper.



de Barros, E., Juliani, F. and de Camargo, L.R. (2017), "Experimental facilities for modal testing", Aircraft Engineering and Aerospace Technology, Vol. 89 No. 2, pp. 358-363.



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