Scholarly record
INVESTIGATION OF SHIP FREE OSCILLATION USING INERTIAL MEASURING UNIT SYSTEMS IN WATER AND AIR ENVIRONMENT
Abstract
The accurate assessment of a ship-s dynamic behavior is essential for understanding its stability characteristics, particularly in response to free oscillations such as roll decay. This study presents the development and application of a compact, cost-effective inertial measurement system based on the Bosch BMX160 IMU sensor, integrated with a Raspberry Pi 4 single-board computer, for measuring ship model free oscillations both in water and in a controlled air environment. The system enables remote data acquisition and real-time monitoring, offering versatility for laboratory and field applications. Comprehensive calibration procedures were performed for both the gyroscopic and accelerometric components of the BMX160 to ensure measurement reliability and minimize sensor drift. Roll decay tests were conducted on a scaled ship model in a towing tank, and analogous free oscillation tests were performed in air using a custom-built test rig designed to replicate controlled roll motions. The resulting datasets provided insight into damping characteristics and natural frequencies in different fluid environments. By comparing the roll decay behavior in air and water, the study explores the influence of added mass and hydrodynamic damping on the ship model's dynamic response. The cross-validation of results between both environments highlights the capability of IMU-based systems to capture subtle dynamic phenomena and offers a reference for numerical and analytical modeling approaches in naval architecture. This integrated system demonstrates a practical, scalable solution for experimental investigations of ship motions and lays groundwork for future studies incorporating more complex motion analysis.
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References6
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