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Proceedings Paper

Automatic optical-electronic system for measurements of elements shifts and deformations in huge mechanical and engineering constructions
Author(s): Yuri Chugui; Vladimir Bazin; Alexander Verkhogliad; Stepan Kalichkin; Vadim Kalikin; Sergei Makarov; Sergei Savkov
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Paper Abstract

As it is known the mining of oil and gas offshore is carried out using the drilling platforms, which are extremely massive and inert. In order to avoid excessive stresses on platform, which is highly inertial object, it consists of few large parts (normally base and legs). Four friction pendulum bearings are used for mechanical link between the base and legs. The bearings functionality is to provide the protection of the platform from all possible mechanical loadings on the legs that might affect the base with the drill and other sensitive equipment. Mechanical loadings include different seismic movements, ice shifts, mechanical loadings during the drilling, heat expansion stress, etc. Bearings are worn out after certain distance traveled and have to be replaced when the movement resource is over. The most important parameter, which allows estimation the bearing resource, is measuring the cumulative distance traveled by the bearing from the beginning of its service with the relative accuracy better then 0.01%, and absolute displacement at ±350 mm range with accuracy better then 1 mm. For this purpose the automatic optical-electronic system for measurements of bearings movements was developed. Its main aim is continuous noncontact measurement of the bearing location and calculation of the total distance traveled by the bearing for any defined time period. Measuring principle of the system is based on optical image processing. The passive part of the system (optical target) is fixed on one part of construction while active part - a field measurement sensor (FMS) is installed on another part of construction that moves relative to the first one. The FMS continuously captures and processes the image of optical target. On the FMS output, after processing, the relative displacement between FMS and Optical Target is obtained with high degree of accuracy. The system was certified as a measuring tool as well as for the use in explosive environments (for gas and oil industry). It is designed for continuous 24-hours operation during 30 years.

Paper Details

Date Published: 13 October 2006
PDF: 6 pages
Proc. SPIE 6280, Third International Symposium on Precision Mechanical Measurements, 628010 (13 October 2006); doi: 10.1117/12.716128
Show Author Affiliations
Yuri Chugui, Technological Design Institute of Scientific Instrument Engineering (Russia)
Vladimir Bazin, Technological Design Institute of Scientific Instrument Engineering (Russia)
Alexander Verkhogliad, Technological Design Institute of Scientific Instrument Engineering (Russia)
Stepan Kalichkin, Technological Design Institute of Scientific Instrument Engineering (Russia)
Vadim Kalikin, Technological Design Institute of Scientific Instrument Engineering (Russia)
Sergei Makarov, Technological Design Institute of Scientific Instrument Engineering (Russia)
Sergei Savkov, Technological Design Institute of Scientific Instrument Engineering (Russia)


Published in SPIE Proceedings Vol. 6280:
Third International Symposium on Precision Mechanical Measurements
Kuang-Chao Fan; Wei Gao; Xiaofen Yu; Wenhao Huang; Penghao Hu, Editor(s)

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