Maurizio Collu Dynamics of Marine Vehicles with Aerodynamic Surfaces

283 Pages·2009·3.21 MB·English

CRANFIELD UNIVERSITY
Maurizio Collu
Dynamics of Marine Vehicles with
Aerodynamic Surfaces
School of Engineering
Offshore Engineering and Naval Architecture Group
PhD Thesis

CRANFIELD UNIVERSITY
School of Engineering, Department of Structures, Impact & Machine Dynamics
Offshore Engineering and Naval Architecture Group
PhD Thesis
Academic Year 2007-2008
Maurizio Collu
Dynamics of Marine Vehicles with Aerodynamic
Surfaces
Supervisor
Prof. M. H. Patel
Co-Supervisor
Dr. F. Trarieux
November 2008
This thesis is submitted in partial fulfilment
of the requirements for the degree
of Doctor of Philosophy
(cid:176)c Cranfield University 2009. All rights reserved. No part of this publication may be
reproduced without the written permission of the copyright holder.

Audentes Fortuna Iuvat
(Fortune favors the bold)
Virgil, Aeneid, book X, line 284
VI
A Chiara,
non solo la donna piu’ bella
che abbia mai incontrato,
ma anche la piu’ comprensiva.

Abstract
An assessment of the relative speeds and payload capacities of airborne and
waterborne vehicles highlights a gap which can be usefully filled by a new vehi-
cle concept, utilizing both hydrodynamic and aerodynamic forces. A high speed
marine vehicle equipped with aerodynamic surfaces (called an AAMV, ’Aerody-
namically Alleviated Marine Vehicle’) is one such concept. The development of
this type of vehicle requires a mathematical framework to characterize its dynam-
ics taking account of both aerodynamic and hydrodynamic forces. This thesis
presents the development of unified and consistent equations of equilibrium and
equations of motion to predict the dynamic performance of such AAMV configu-
rations.
An overview of the models of dynamics developed for Wing In Ground ef-
fect ’WIGe’ vehicles and high speed marine vehicles (planing craft) is given first.
Starting from these models, a generic AAMV configuration is proposed and a
kinematics framework is developed. Then, taking into account the aerodynamic,
hydrostatic and hydrodynamic forces acting on the AAMV, equations of equilib-
rium are derived and solved. This is followed by deriving and solving the full
equations of motion, using a small perturbation assumption. A static stability
criterion, specific for the AAMV configuration, has been developed. This math-
ematical framework and its results are implemented in MATLAB and validated
against theoretical and experimental data. The resultant capability for analysing
novel AAMV configurations is presented through two parametric analysis. The
analysis demonstrate that these models offer a powerful AAMV design tool.