Measurement of the resonance frequency, the loss factor, and the dynamic young's modulus in structural steel and polycarbonate by using an acoustic velocity sensor

An acoustic velocity sensor, micro-flown, was used to monitor the vibration signal in measurements of the resonance frequency, the loss factor, and the dynamic Young’s modulus of structural steel and polycarbonate by using a resonance method. The results showed that the measured loss factors of the structural steel and polycarbonate used in the present specimen were 0.0023 and 0.056, respectively, and the Young’s moduli were 198.4 GPa and 2.4 GPa. The values measured with micro-flown agreed with those obtained with a conventional displacement sensor and with the theoretically estimated and reference values. The agreements ensure the reliability of the use of a micro-flown acoustic velocity sensor in measuring the resonance frequency, the loss factor, and the dynamic Young’s modulus.