Tài liệu hạn chế xem trước, để xem đầy đủ mời bạn chọn Tải xuống
1
/ 647 trang
THÔNG TIN TÀI LIỆU
Cấu trúc
Contents
Preface
Acknowledgements
1. Introduction to hovercraft
1.1 Hovercraft beginnings
1.2 ACV and SES development in the UK
1.3 ACV and SES development in the former USSR
1.4 US hovercraft development
1.5 ACV and SES development in China
1.6 SES and ACV developments in the 1990s
1.7 Applications for ACV/SES
1.8 The future
1.9 SES and ACV design
2. Air cushion theory
2.1 Introduction
2.2 Early air cushion theory developments
2.3 Practical formulae for predicting air cushion performance
2.4 Static air cushion characteristics on a water surface
2.5 Flow rate coefficient method
2.6 The 'wave pumping' concept
2.7 Calculation of cushion stability derivatives and damping coefficients
3. Steady drag forces
3.1 Introduction
3.2 Classification of drag components
3.3 Air cushion wave-making drag (R[sub(w)])
3.4 Aerodynamic profile drag
3.5 Aerodynamic momentum drag
3.6 Differential air momentum drag from leakage under bow/stern seals
3.7 Skirt drag
3.8 Sidewall water friction drag
3.9 Sidewall wave-making drag
3.10 Hydrodynamic momentum drag due to engine cooling water
3.11 Underwater appendage drag
3.12 Total ACV and SES drag over water
3.13 ACV skirt/terrain interaction drag
3.14 Problems concerning ACV/SES take-off
3.15 Effect of various factors on drag
4. Stability
4.1 Introduction
4.2 Static transverse stability of SES on cushion
4.3 SES transverse dynamic stability
4.4 Calculation of ACV transverse stability
4.5 Factors affecting ACV transverse stability
4.6 Dynamic stability, plough-in and overturning of hovercraft
4.7 Overturning in waves
5. Trim and water surface deformation under the cushion
5.1 Introduction
5.2 Water surface deformation in/beyond ACV air cushion over calm water
5.3 Water surface deformation in/beyond SES air cushion on calm water
5.4 Dynamic trim of ACV/SES on cushion over calm water
6. Manœuvrability
6.1 Key ACV and SES manœuvrability factors
6.2 Introduction to ACV control surfaces
6.3 Differential equations of motion for ACV manœuvrability
6.4 Course stability
6.5 ACV turning performance
7. Design and analysis of ACV and SES skirts
7.1 Introduction
7.2 Development and state of the art skirt configuration
7.3 Static geometry and analysis of forces acting on skirts
7.4 Geometry and analysis of forces in double or triple bag stern skirts
7.5 Geometry and forces for other ACV skirts
7.6 Analysis of forces causing the tuck-under of skirts
7.7 Skirt bounce analysis
7.8 Spray suppression skirts
7.9 Skirt dynamic response
8. Motions in waves
8.1 Introduction
8.2 Transverse motions of SES in beam seas (coupled roll and heave)
8.3 Longitudinal SES motions in waves
8.4 Longitudinal motions of an ACV in regular waves
8.5 Motion of ACV and SES in short-crested waves
8.6 Plough-in of SES in following waves
8.7 Factors affecting the seaworthiness of ACV/SES
9. Model experiments and scaling laws
9.1 Introduction
9.2 Scaling criteria for hovercraft models during static hovering tests
9.3 Scaling criteria for tests of hovercraft over water
9.4 Summary scaling criteria for hovercraft research, design and tests
10. Design methodology and performance estimation
10.1 Design methodology
10.2 Stability requirements and standards
10.3 Requirements for damaged stability
10.4 Requirements for seaworthiness
10.5 Requirements for habitability
10.6 Requirements for manœuvrability
10.7 Obstacle clearance capability
11. Determination of principal dimensions of ACV/SES
11.1 The design process
11.2 Role parameters
11.3 Initial weight estimate
11.4 First approximation of ACV displacement (all-up weight), and estimation of weight in various groups
11.5 Parameter checks for ACV/SES during design
11.6 Determination of hovercraft principal dimensions
12. Lift system design
12.1 Introduction
12.2 Determination of air flow rate, pressure and lift system power
12.3 Design of fan air inlet/outlet systems
12.4 Lift fan selection and design
13. Skirt design
13.1 Introduction
13.2 Skirt damage patterns
13.3 Skirt failure modes
13.4 Skirt loading
13.5 Contact forces
13.6 Selection of skirt material
13.7 Selection of skirt joints
13.8 Assembly and manufacturing technology for skirts
13.9 Skirt configuration design
14. Structural design
14.1 ACV and SES structural design features
14.2 External forces on hull – introduction to the strength calculation of craft
14.3 Brief introduction to the structural calculation used in MARIC
14.4 Calculation methods for strength in the former Soviet Union
14.5 Safety factors
14.6 Considerations for thickness of plates in hull structural design
14.7 Hovercraft vibration
15. Propulsion system design
15.1 Introduction
15.2 Air propellers
15.3 Ducted propellers and fans
15.4 Marine propellers
15.5 Water jets
15.6 Power transmission
15.7 Surface contact propulsion
16. Power unit selection
16.1 Introduction
16.2 Powering estimation
16.3 Diesel engines
16.4 Gas turbines
16.5 General design requirements
16.6 Machinery space layout
16.7 Systems and controls
16.8 Operation and maintenance
References
Index
A
B
C
D
E
F
G
H
I
J
K
L
M
N
O
P
Q
R
S
T
U
V
W
X
Y
Nội dung
[...]... systematically describes ACV and SES theory - primarily the hydrodynamics and aerodynamics ofcushion systems The third part, from Chapters 11 to 16, describes the design methods of ACV and SES, including the design criteria and standards for craft performance, lift system design, skirt design, hull structure design, and methods for determining the principal dimensions ofcraft The principles for material... under the wing and produce static lift This gives a PARWIG the ability to hover through static cushion lift alone Due to the distinct differences for both hydrodynamics and structural design between PAR/WIG and ACV/SES craft, the theory and designof PAR/WIG are not discussed further in this book Aircushioncraft are part of the larger group of high performance vehicles shown in Fig 1.1, and may be divided... (years) Steam boat Hydrofoil craft Submarine Hovercraft Jet aircraft Aircraft 41 35 25 13 12 8 hovercraft, focussing on the UK, former USSR, USA and China which have been leading centres of both analytical and practical craft development In Britain the hovercraft has been developed mainly for civil applications, while the US government has strongly supported development for military use, and only lately has... only the calculation method for stability of ACV and SES on cushion, and not stability of hovercraft while floating off cushion With respect to the designof machinery and propulsion systems of ACV and SES, for instance, air or water propeller design, water-jet propulsion installation and machinery installtion in hovercraft, which is rather different from that on conventional ships, these are covered... closer to that of aircraft Several vehicle concepts have developed from this work Amphibious hovercraft (or ACV) The amphibious hovercraft (Fig 1.3) is supported totally by its air cushion, with an air curtain (high pressure jet) or a flexible skirt system around its periphery to seal the cushionair These craft possess a shallow draft (or a negative draft of the hull structure itself) and amphibious... and designof hovercraft, and endeavour to connect the theories with practice in order to solve practical problems in hovercraft design xii Preface There are three parts to this book The first chapter gives a general introduction to hovercraft, which introduces briefly the classification of hovercraft, and the development and civil and military applications of the hovercraft in China and abroad in the... the 1960s, to practical use as ferries and military craft More than 60 hovercraft types have been constructed or imported for operation in China This book has been written to summarize the experience in aircushion technology in China and abroad to date, with the aim of improving understanding ofaircushion technology Due to the relatively quick development of the cushion technology relative to other... In the 1970s and 80s on average about one third of passengers and cars on these routes were transported by hovercraft, with transport efficiency of about double that of hydrofoil craft Market development: from the beginning of the 80s to the present Although aircushion technology had advanced significantly by the end of the 70s, there were still difficulties to overcome in order for hovercraft to compete... book are teachers and students, both at undergraduate and postgraduate level in universities, and engineers, technicians and operators who are involved in ACV/SES research, design, construction and operation or wish to work in this field During the writing of this book, the authors have had the help and support from senior engineers and researchers of MARIC and used research results and theories from... could not continue to serve in practice The theory of air cushion performance has therefore changed significantly since the 1960s On one hand a lot of technical references and some technical summaries and handbooks with respect to aircushion technology are available to translate the physical phenomena but on the other, owing to different research methods, objects and means, there are many different methods . y0 w0 h1" alt=""
Theory
and
Design
of Air
Cushion Craft
This page intentionally left blank
Theory
and
Design
of Air
Cushion Craft
Liang
Yun
Deputy
. stability
of ACV and SES on
cushion,
and not
stability
of
hovercraft
while
floating off
cushion.
With respect
to the
design
of
machinery
and
propulsion