TLP STRUCTURAL HEALTH MONITORING BASED ON VIBRATION SIGNAL OF ENERGY HARVESTING SYSTEM

Abstract

STRUCTURAL HEALTH MONITORING (SHM) OF TENSION LEG PLATFORM (TLP) IS VERY CRUCIAL FOR PREVENTING CATASTROPHIC AND SUDDEN COLLAPSE OF THE STRUCTURES. ONE OF THE METHODS OF MONITORING THESE STRUCTURES IS IMPLEMENTING SHM SENSORS. SUPPLYING ENERGY FOR THESE SENSORS FOR A LONG PERIOD IS A CHALLENGING PROBLEM. SO, ONE OF THE NEW METHODS OF SUPPLYING ENERGY FOR SHM, IS USAGE OF MECHANICAL ENERGY. IN THIS METHOD, THE PIEZOELECTRIC MATERIAL IS EMPLOYED TO CONVERT THE ME-CHANICAL ENERGY WHICH IS RESULTED FROM VIBRATION OF STRUCTURE, TO ELECTRICAL ENERGY. THE ADVANTAGE OF THIS METHOD IS BASED ON NOT IMPLEMENTING THE BATTERY CHARGING SYSTEM. THEREFORE, IN THIS PAPER, AFTER MODELING TLP STRUCTURE, ENERGY SUPPLYING OF THESE SENSORS WITH PIEZOELECTRIC CONVERTERS IS STUDIED. FURTHERMORE, FAULT DIAGNOSIS OF THESE STRUCTURES IN THE PRESENCE OF DIFFERENT UNCERTAINTIES IS PROPOSED BY THE FEATURES OF VOLTAGE SIGNAL, PRODUCED FROM PIEZOELECTRIC PATCHES AND FUZZY CLASSIFICATION METHOD. RESULTS SHOW THAT THIS METHOD CAN DIAGNOSE FAULTS OF THE STRUCTURE WITH AN ACCEPTABLE SUCCESS RATE.