The Society of Naval Architects of Japan
60TH ANNIVERSARY SERIES
V O L U M E 11
RESEARCHES ON THE MANOEUVRABILITY
OF SHIPS IN JAPAN
By
Shosuke
i N O U ESeizo
MOTORAKensaku
NOMOTOShojiro
O K A D AHatsuzo
T A N IYasufumi
Y A M A N O U C H IThe Society of Naval Architects of Japan
Tokyo, 1966
C O N T E N T S
P E E F A C E
Page CHAPTER 1. EQUATIONS OF MOTION A N D FORCE ACTING UPON SHIP-BODY . . . . 1
1.1 Equations of Motion 1
1.2 V i r t u a l Mass 4 r.3 Force Acting Upon a Ship Body on Calm Water 7
CHAPTER 2. RESPONSE ANALYSIS OF MANOEUVRABILITY AND ITS
APPLICA-TION TO SHIP DESIGN 17
2.1 Introduction 17 2.2 Transfer Function in Steering and the Structure of Manoeuvrability 18
2.3 The First-Order System Approximation of Ship Motion i n Steering and
Steer-ing Quality Indices 31 2.4 Application of the Steering Quality Indices on Ship Design 43
2.5 Analysis of Automatic Steering on the Basis of the Transfer Function
Ap-proach 53
CHAPTER 3. ON THE PERFORMANCE OF RUDDERS A N D THEIR DESIGNS 61
3.1 Introduction 61 3.2 Performance of Open Rudder 62
3.3 On the Performance of Rudder Placed Behind Propeller 66
3.4 Performance of Rudder Positioned Behind Ship 71
3.5 Concept of Rudder Design 79
CHAPTER 4. SERIES MODEL EXPERIMENTS ON THE EFFECTS OF SHIP FORMS
ON MANOEUVRABILITY 83
4.1 Introduction 83 4.2 The Effect of CB and the Rudder Area 84
4.3 SR-41 Series (59)—Comparison of the Single & T w i n Screw Ship and the
Ef-fect of the Bulbous Bow 85 4.4 SR-45 Series (60)—L/S, Series for High Speed Cargo Ships 87
4.5 SR-61 Series (61)—L/B Series w i t h Constant Bid, CB on Tanker Form 92
4.6 SRI—L/B Series (43) 96 4.7 The Correlations of Model Tests and Actual Ship Performance on the
Manoeu-vrability 98
CHAPTER 5. ANALYSIS OF SHIP-STEERING ENGINE-HELMSMAN SYSTEM 103
5.1 Introduction 103 5.2 Transfer Functions of Ship, Steering Engine and Helmsman 103
ii CONTENTS
Page
5.3 Dynamic Characteristics of Helmsman 105 5.4 Analysis of Ship-Helmsman System by Means of the Root-Locus Method 108
5.5 The Relation Between the Manoeuvrability Indices of Ship and the Dynamic
Characteristics of Helmsman 113
CHAPTER 6. MISCELLANEOUS PROBLEMS 117
6.1 The Manoeuvrability of Ships Under the Effect of Wind 117 6.2 Kinematic Considerations on the Effectiveness of a Bow-Thruster 120
6.3 A n Improvement of Ship's Steering Qualities by Means of Automatic Control. .123
6.4 Manoeuvrability in Confined Waters 126
