Experimental study of a new type of hydrodynamic log

This paper presents research on the development of a new type of ship speed measuring device based on microelectromechanical systems (MEMS). A design deficiency in the configuration proposed in the authors’ earlier publications has been identified. Computer-based calculations demonstrated a significant error in determining vessel speed, caused by inaccurate measurement of static water pressure resulting from fluid flow around a cylindrical body. Further studies were carried out using modern software packages to evaluate errors in vessel speed measurement and to determine the optimal geometry of the log tube and the best locations for installing pressure sensors. Based on the results of numerical simulations, an improved design is proposed that reduces measurement error. Experimental testing of a prototype under real marine conditions confirmed the feasibility of measuring a vessel’s relative speed using MEMS components. The model presented in this study eliminates many of the drawbacks characteristic of previous generations of hydrodynamic logs. The device has been significantly miniaturized, creating prospects for installation on both conventional vessels and small autonomous maritime craft. Key directions for further research are highlighted.