IoTセンサーとアクチュエータを統合した振動センシング・アクチュエーションデバイスの試作

抄録

Owing to aging of distribution water pipe, the accidents such as leakage and burst are occurring. To prevent above accidents, it is essential to maintain and manage the system through appropriate renewal. For efficient maintenance and management, it is important to evaluate the condition of main by Non-Destructive Testing (NDT) and reflect it in renewal plans. One of method to maintain the main efficiently, deterioration diagnosis method for distribution water pipe focused on the eigen frequency change of in-plane bending mode in circular cylindrical shell is already suggested. The eigen frequency change of in-plane bending mode is expected to have high accuracy in detection of deterioration, because the eigen frequency is proportional to pipe thickness. However, the previous study was lack of the consideration of the implementation method for sensing equipment. In this study, we develop a vibration sensing actuation device that solves these problems. The device constructed from an IoT sensor module, an electrical relay circuit, a white noise generator and an electrodynamic exciter. The applicability of the device was evaluated using experimental circular ring to see if pipe thinning could be diagnosed. As a result, it was implied that the probability density of acceleration changed depending on the presence or absence of pipe thickness thinning.