Abstract
The present study aims to reduce the pitch motion of an assault amphibious vehicle system in seaways by waterjet impeller revolution rate control. A series of seakeeping tests were performed in a towing tank with a 1/4.5-scale model. This vehicle is manufactured as a box-shaped hull, and since an appendage that generates lift force is attached, the amount of change in pitch motion is large according to the forward speed. For pitch motion reduction, the impeller revolution rate and resultant pitch moment were controlled through a proportional-integral-derivative controller. Improvements in seakeeping performance were examined in both regular and irregular conditions by the model tests in terms of root mean square of pitch motion. The tuned controller decreased pitch motion by more than 60%.
Highlights
IntroductionPublisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations
The effectiveness of the pitch motion control of an Assault amphibious vehicles (AAVs) was experimenIn this study, the effectiveness of the pitch motion of an AAV was experitally verified through the impeller revolution rate controlcontrol of a motor-driven waterjet promentally verified through the impeller revolution rate control of a motor-driven waterjet pulsion system
The tendency of the pitch response shows a similar result to that of the case where the controller is not activated, and most of the motion responses are reduced by about 70% in the frequency region where the pitch motion largely occurs
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Assault amphibious vehicles (AAVs) are categorized as a weapon system used for landing operations and landing amphibious forces from the sea. Fast arrival at the shore from ships is a critical issue; reliable and robust hydrodynamic performance of AAVs at high speed is essential. AAVs usually have a box-shaped chassis, but some appendages are installed to reduce resistance. The design of AAVs with appendages for operation at the sea considers trim-control devices such as hydrofoil to achieve high speed by decreasing the wetted surface area at high speed. AAVs are equipped with waterjets for propulsion, which are common in high-speed vessels
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