Journal of the Korean Society for Nondestructive Testing (비파괴검사학회지)

The Korean Society for Nondestructive Testing (한국비파괴검사학회)
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Development of Pressure Control System of Contact Transducer for Measurement of Ultrasonic Nonlinear Parameter

  • Lee, In-Ho (School of Mechanical Engineering, Hanyang University) ;
  • Son, Dae-Soo (School of Mechanical Engineering, Hanyang University) ;
  • Choi, Ik-Hwang (Automotive Engineering, Graduate School of Hanyang University) ;
  • Lee, Tae-Hun (Automotive Engineering, Graduate School of Hanyang University) ;
  • Jhang, Kyung-Young (School of Mechanical Engineering, Hanyang University)
  • Published : 2007.12.30
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Abstract

Ultrasonic nonlinearity has been considered as a promising method to evaluate the micro damage of material; however, its magnitude is so small that its measurement is not easy. Especially, when we use contact PZT transducer, if the contacting pressure is not kept in constant during the measurement then there exists extraneous fluctuation in the measured nonlinearity caused by the unstable contact condition, In this paper, we developed a pneumatic control system to keep the contacting pressure of transducer in constant during the measurement and analyzed the effect of contacting pressure to the ultrasonic nonlinearity measurement As a result, we found that the pressure of transducer in our measurement system should be greater than 170 kPa to measure the ultrasonic nonlinear parameter in stable with no dependency on the contacting pressure.

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References

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