THE structure of an aeroplane has several natural modes of vibration in flexure and torsion with frequencies within the le frequency range covered by possible forcing vibrations emanating from engine, airscrew and aerodynamic sources. Resonance in any of these modes may give rise to vibration in the structure of a severe nature which, in extreme cases, may be a limiting factor.
Barlow, F.G. (1938), "The Vibration of Aircraft: An Instrument Developed at the R.A.E. to Obtain Quantitative Measurements", Aircraft Engineering and Aerospace Technology, Vol. 10 No. 10, pp. 301-305. https://doi.org/10.1108/eb030376
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