Fatigue Damage Monitoring System of the Water Bag for Water-Resources Marine Transportation

最近，世界上许多国家都面临着供水短缺的问题，而且情况还在恶化。为了克服这种情况，开发了一种用于海上运输和储存水的水袋。然而，传统的传感器很难检测到它的损伤，因为一个水袋漂浮在海面上，柔性的，超过100米长。然后，在本研究中，我们提出了一种新的基于缆索理论的大型水袋损伤检测技术。首先考虑了水袋及其环境的等效电路和模型。当从电极向水袋注入电流时，无论是从实验还是从理论上，都观察到受损和未受损的水袋之间的膜电位发生了明显的变化。这将为实际应用提供一种简便、经济的损伤监测方法。

Recently, many countries in the world are faced with water supply shortage and the situation is getting worse. In order to overcome this situation, a water bag was developed for sea-borne transportation and storage of water. However, it is difficult to detect its damage with conventional sensors, since a water bag is floating in the sea, flexible and more than 100 m long. Then, in this research, we propose a new damage detection technique for a large water bag by the cable theory. The equivalent circuit and a model of the water bag and its environment are considered first. When current is injected into a water bag from an electrode, obvious change of membrane potential is observed between damaged and undamaged water bags both experimentally and theologically. This will provide an easy and economical damage monitoring method for a practical usage.