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Contenuto archiviato il 2022-12-27

DIMENSIONAL VERIFICATION TO BE CARRIED OUT AT OPEN SEA ON OFFSHORE STRUCTURES BY MEANS OF PHOTO GRAMMETRY

Obiettivo

Phase 1 : Prefeasibility study and design of equipment, special instruments and softwares perfecting. Construction of a special metal support beam (nicknamed S. E. R. ) to be installed on a medium-large size helicopter. Manufacture of small ancillary instruments.
Phase 2 : Experimental tests of photographing from helicopter and subsequent tests of digital stereoplotting and mathematical processing.
Practical results in very large scales up to 1:25 and in digital measurements proved to be reliable and accurate in dimensional controls ans as built survey field. Possible use range from civil /industrial engineering to geology and shallow water hydrography even when the subject to be surveyed is moving.
The S. E. R. consists of a balanced beam which just out of the sides of an AB412 Agusta helicopter. At each end of the beam, contained in a specially designed pod, is a UMK 10/1318 film metric camera. The two cameras are synchronized and controlled by an impulse emitter placed on the control-console inside the craft itself. There are also two TV training cameras which are integral to the photographic cameras, and two monitors to check the accuracy of the training operations.
The beam has a nominal base of 6500 mm and may rotale freely around its longitudinal axis thus allowing downward vertical, forward horizontal and tilted stereo-photogrammetric takes, through any angle and ata distance between 30 and 100 metres.
The installation of an S. E. R. on board the AB412 takes about 2 hours and a half on average. Removing the system takes about 1 and a half hours.
At the sea the S. E. R. installed on the helicopter while hovering allows the survey of complex industrial installation, offshore petroleum platforms and structures, metal structures already loaded on barges, the same while they are launched at the sea, overall takes of ships, or details of the same, even during navigation.
On land instead possible performances could be in civil protection and civil engineering. For instances inventory of damages caused by eartquakes or other natural events, nearly immediate survey (max. 4 hours, weather and light condition permitting) of disasters occuring in any part of territory, for use in judiciary inquests, survey of natural phenomena in rapid evolution, dimensional checks and surveys on complex and inaccessible constructions, checks on monumental buildings towering over densely built city centres, surveys on steep and rocky coastal areas where there are or will be construction works.
Phase 1 : Prefeasibility study and design of equipment, special instruments and softwares perfecting. Construction of a special metal support truss (nicknamed "SER") to be installed on a medium -large size helicopter. Manufacture of small ancillary instruments. Experimental tests of photographing from moving supports ( helicopter, floating craft) and subsequent tests of digital stereoplotting and mathematical processing.
Phase 2 : In case of successful results in the 1st phase, proceed with the perfecting of means, equipments, instruments and methods in order to make the procedure fully operational and economical.

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ENI SpA- AGIP
Contributo UE
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Indirizzo
VIA EMILIA 1
20097 S. Donato Milanese (MILANO)
Italia

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