キャビテーション壊食によるTiNセラミックス皮膜の寿命評価に関する研究 : FBGセンサで検出したAE信号のスペクトル指数の適用

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In the piping wall of the industrial machinery such as the chemical plants, the ceramics coating materials which are excellent in the heat-resistance and the corrosion resistance are used. However, in the wall of which the speed and pressure of the flowing fluid become high, the cavitation is generated, and the adverse effect of the performance deterioration, the noise, the vibration and the cavitation damage is being brought about. Especially, the serious adverse effect is the cavitation damage, and the large accidents by the fracture of the piping will be caused. Therefore, the life prediction of the film is required in order to prevent the accidents. In this study, the life prediction of the film was tried by the features of the detected AE signals in the cavitation erosion experiment. Then, the FBG (Fiber Bragg Grating) sensor which is a kind of optical fiber sensor was used, because the AE measurement by the sensor using the piezoelectric device which handles the electric signals is very difficult in the environments where the explosion-proof and the water resistance such as the chemical plants are required. As the results, the following things became clear: (1) From the frequency analysis results of the detected signals, it was possible to evaluate the fracture types of the film. (2) The spectrum analysis is effective for the analysis method of the detected signals, and the life of the film is the case in which the spectrum exponent reached about 2.5. Also the similar results were observed, when the heat history was given to the film.
2010-10-25

キャビテーション壊食によるTiNセラミックス皮膜の寿命評価に関する研究 : FBGセンサで検出したAE信号のスペクトル指数の適用

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