Health Assessment Model and Maintenance Decision Model for Seawall Prognostics and Health Management System

Because the traditional maintenance method of seawalls suffers from problems of insufficient maintenance support ability and significant waste of resources, there is an urgent need to establish a scientific management system for seawalls. Therefore, advanced prognostics and health management (PHM) technology was introduced into seawalls, structure of the seawall PHM system was set up, and the health assessment model and the maintenance decision model of the seawall PHM system were studied. Combining the characteristics of seawalls and high-frequency monitoring information, the seawall health assessment indexes were selected and the weights of health assessment indexes were calculated by projection pursuit model. Then, the health assessment model was set up using fuzzy comprehensive assessment method. The Weibull proportional hazard model was used to link the health state, running time, and failure rate of the seawall. Using maximum availability as the decision objective, the maintenance decision model was established base on the Weibull proportional hazard model. The example analysis shows that the health assessment model can assess seawall health effectively and the maintenance decision model can make correct maintenance decisions in a timely fashion based on the seawall health state.