8 March 1999 Real-time monitoring of icebreaker propeller blades' ice load using underwater laser ranging system
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Navigation in arctic waters presents a formidable challenge to the ships' propulsion systems as large ice pieces impinging on their propeller blades may result in stresses exceeding the strength of blade material. Damage to propellers is costly and can also spell disaster if a shop becomes disabled in a remote area. To prevent such situations, design practice must be improved and validated against experimental data. In this paper we present the design of a system that performs ice load measurements. This system is based on conventional triangulation and uses an array of laser beams aimed at the propeller blades to monitor in real time their deformations. As the propeller rotates, each point rage sensor describes an arc of a circle on the blades. Using template-matching techniques, the range values for these series of arcs can be used to infer the actual ice-induced blade deformations. The actual system provides range measurements at a rate of 2 kHz on three different channels. The system accuracy is 0.5 mm at distances in excess of 3 meters.
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Andre Morin, Andre Morin, Michel Arsenault, Michel Arsenault, Merv H. Edgecombe, Merv H. Edgecombe, Ernst A. Radloff, Ernst A. Radloff, "Real-time monitoring of icebreaker propeller blades' ice load using underwater laser ranging system", Proc. SPIE 3640, Three-Dimensional Image Capture and Applications II, (8 March 1999); doi: 10.1117/12.341062; https://doi.org/10.1117/12.341062

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