Within the article the applicability of the Self-oscillating Acoustical System (SAS) in order to continuously monitor changes in strain was examined. The essence of SAS is to use a vibration exciter and vibration receiver placed in a distance, which is coupled by an amplifier operating in a positive feedback loop. Changing the speed of wave propagation, which is associated with the change of frequency in the system, can be measure of deformation of the material. The study confirmed the existence of the phenomenon of self-oscillating which can be used to assess the state of metal frame deformation.
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01 September 2011
14 February 2012
31 March 2012
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