| 摘要 |
<p>A structural health monitoring system (25) for a marine composite riser string (30) is provided. Each riser pipe section (31) includes a cylindrical form having an axis (A) and also a carbon epoxy matrix (37). A sensor (38) is associated with (e.g., embedded in) and substantially circumscribes the riser pipe section (31). The sensor (38) includes a polyvinylidene fluoride laminate (35) and electrodes (36) (e.g., conductive silver ink coating) so that the sensor (38) generates electricity at the electrodes (36) responsive to mechanical stresses and strains of the riser section (31), including vibrations. The system (25) can also include a data acquisition system (79) and digital signal analyzer (70) to analyze signals responsive to the generated electricity at the electrodes (36) of sensors (38) and to provide health monitoring and damage detection for the marine riser pipe string (30), including impact damage and fatigue crack initiation. The system (25) can further include a subsurface (23) energy storage device (40) and a plurality subsurface microelectromechanical devices (42) coupled to the subsurface (23) energy storage device (40).</p> |
