Transfer Function for a Controllable Pitch Propeller with Added Water Mass

Author:

Leshchev Volodimir1ORCID,Maslov Igor1,Palagin Oleksandr1ORCID,Naydyonov Andrii1ORCID

Affiliation:

1. 1 Department of Ship Power Plants and Systems , Danube Institute of the National University „Odessa Maritime Academy” , Ukraine

Abstract

Abstract The relevance of this study lies in the fact that it presents a mathematical model of the dynamics of the propulsion system of a ship that takes into consideration the mass of water added to it. The influence of this phenomenon on the resonant frequencies of the propeller shaft is examined, and a transfer function for a controllable-pitch propeller is obtained for various operating modes. The purpose of the study is to improve the calculation of the dynamic operating modes of a controllable-pitch propeller by examining the features of a visual models. The VisSim software package is used in the study. A visual model is developed that considers the influence of the rotational speed on the value of the rotational inertia attached to the variable-pitch screw of the mass of water, and a special transfer function is proposed. The study shows that a transfer function of this type has a loop enabling negative feedback. An analysis of the operation of the propeller shaft at its resonant frequency is conducted based on the application of frequency characteristics using the transfer functions obtained. We show that in the low-frequency region, a consideration of the added rotational inertia using the proposed transfer function leads to a significant difference compared to the result obtained with the existing calculation method.

Publisher

Walter de Gruyter GmbH

Subject

Mechanical Engineering,Ocean Engineering

Reference31 articles.

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3. Król, P. 2021. Hydrodynamic state of art review: Rotor – stator marine propulsor systems design. Polish Maritime Research, 28(1), 72-82. https://doi.org/10.2478/pomr-2021-0007

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