Journal
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
Volume 78, Issue -, Pages 143-155Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ymssp.2016.02.035
Keywords
Self-excited system; Piezoelectric emitter and receiver; Stress measurement; Acoustoelastic coefficient
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This paper presents the Self-excited Acoustical System (SAS) in elastic construction stress change measurement. The system is based on the acoustical autoresonance phenomena and enables an indirect measurement of the construction effort level. The essence of the SAS system is to use a piezoelectric vibration emitter and a piezoelectric vibration receiver placed at a distance, which are coupled with a proper power amplifier, and which are operating in a closed loop with a positive feedback. This causes the excitation of the system. The change of the velocity of wave propagation, which is associated with the change of the resonance frequency in the system is caused by the stress change in the examined material. A variable, which determines the change of the acoustic wave velocity, is called an acoustoelastic coefficient beta. Such a coefficient allows to determine the absolute stress value in the tested material. (C) 2016 Elsevier Ltd. All rights reserved.
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