METHOD AND DEVICE FOR DETECTION AND DIAGNOSTICS OF DEFECTS IN MARINE ICE-RESISTANT PLATFORMS Russian patent published in 2013 - IPC G01N29/04 

FIELD: testing equipment.

SUBSTANCE: on a platform deck they install a double-component sensor of horizontal accelerations of infrared range and with its help they register in a PC the amplitude, form and frequency spectrum of internal bending vibrations of the platform under effect of ice loads, disturbance and wind, which contain information on availability and nature of defects in stressed units of the structure. Then quantitative estimates of defects are calculated according to formulas, which establish the quantitative relation between parameters of oscillations and defects, at the same time availability of defects in the form of cracks and breaks in support units of the structure is determined by availability and amplitude of even harmonics in the spectrum of oscillations, and summary quantitative estimate of metal fatigue is determined by reduced quality of oscillations, which manifests in the width of spectrum of the main harmonic. The device for detection and diagnostics of defects is characterised by using active RC-filters of infrared range.

EFFECT: provision of the possibility to detect and diagnose cracks and breaks in stressed units of structure of marine oil and gas platforms, provision of metal fatigue assessment.

2 cl, 1 dwg