Proceedings of the KSME Conference (대한기계학회:학술대회논문집)
- 2007.05b
- /
- Pages.3383-3388
- /
- 2007
Study on the Comparison of Piezoelectric Property of Acoustic Sensor for Valve Leak Diagnosis
밸브누설 진단용 PZT 및 Pb-Free 음향센서의 압전특성 비교 연구
Abstract
To compare the sensor performance of AE leak diagnosis system which can measure valve leak conditions, AE activities such as RMS voltage level, AE signal trend, leak rate degree according to AE database, FFT spectrum were measured on valve of the simulated test system for power plant. AE activities were recorded and analyzed from various operating conditions including different temperature, pressure difference, valve size and fluid using both piezoelectric acoustic emission sensor and Pb-Free acoustic emission sensor. The results of this study are utilized to select the type of sensors, the frequency band for filtering and thereby to improve the signal-to-noise ratio for diagnosis or monitoring of valves in operation. As the final result of application study above, portable type leak diagnosis system by AE was developed. The outcome of the study can be definitely applied as a means of the diagnosis or monitoring system for energy saving and prevention of accident for power plant valve.
Keywords
- Valve Leak;
- Piezoelectric Acoustic Emission Sensor;
- Pb-Free Acoustic Emission Sensor;
- Fourier-Frequency Transform;
- Frequency Analysis
- 밸브누설;
- 공진 압전 음향센서;
- 무연 압전 음향센서;
- 퓨리에 변환;
- 주파수분석;