Service Communautaire d'Information sur la Recherche et le Développement - CORDIS

Algorithms to detect damages

In case of damage, an increase of flexibility of the tanks is expected. In addition a global deformation of the tank is expected - bending, ovalization, etc. Another particularly important aspect to be monitored is the symmetry of the tank behaviour. The strain field in tank is expected to be symmetrical with respect to the plane perpendicular to the axis of the tank and crossing the middle of the cylindrical part, and rotationally symmetrical with respect to axis itself. In case of damage, the strain field is expected to loose the symmetry.

To detect the damage, the behaviour of the tank is assessed at three levels:
1. In case of damage the tanks is expected to become more flexible; therefore, the slope of the strain-pressure diagram is expected to increase
2. In case of damage the tanks is expected to deform (bend, ovalize, etc.); as a consequence, axially symmetrical pairs of sensors will measure different values of strain
3. In case of damage the strain field in the tank is expected to loose the symmetry; hence, the coefficients of linear correlation between the sensors will change.

The optimised sensor layout was demonstrated to detect cutting and impact damages that significantly reduce the burst pressure. The defect can be detected at pressure well below the burst pressure, thus allowing an early response in case of dangerous damages.

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