Measurement and Analysis of Drag on a Real Submarine Periscope

摘要

A submarine periscope will bend and vibrate because of the impact of drag when it is raised. The drag on a periscope is an important reference for the design, use, and other aspects of the periscope. To investigate the drag on a submarine periscope, the dynamic strain responses of a real submarine periscope are measured in the field using bare fiber Bragg grating (FBG) sensors based on quasi-distributed measurement technology. The experimental scheme for the real submarine periscope is designed and described in detail. To ensure installation accuracy and speed, a novel packaged FBG sensor array is proposed. Based on the prior full preparation, some complete data of the downstream periscope are collected, and the drag on the periscope in different conditions is analyzed. Furthermore, theoretical analyses (using the Morison equation) and numerical simulations (using Fluent) of drag are performed based on the parameters of the periscope. Finally, some conclusions are given.