OrcaFlex Manual - Orcina

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System Modelling: Data and Results, Lines Data for Umbilicals 376 w The Line Type Wizard can help build a line type to represent umbilical. Umbilical cables have many applications including the carrying of electrical communication wires and hydraulic connectors to submersibles. The Line Type data quantities that the wizard derives have been estimated from a limited amount of project data. The single item of input data is: Umbilical Diameter The outer diameter of the umbilical. Each derived line type property is a function of this diameter. Data for Hoses The Line Type Wizard helps you build a line type to represent a hose, based on the following data. A limited amount of available project data has been collated and used to derive purely empirical relationships between the diameter of types of hose and certain line type data quantities. The input data consists of: Hose Inner Diameter Each derived line type property is a function of the hose inner diameter. Hose Type The Hose Type can be one of high pressure, low pressure or fold-flat. These categories roughly cover the available project data. Outer and Inner Diameters The Line Type Wizard sets up Outer and Inner Diameters for hoses and umbilicals as follows: Hoses The inner diameter (ID) is specified by the user and the outer diameter (OD) is a function of the inner diameter: Umbilicals OD = 1.40 ID m (for High Pressure) [90% 150%], OD = 1.28 ID m (for Low Pressure), OD = 1.34 ID m (for Fold-Flat). The inner diameter (ID) is set to zero and the outer diameter (OD) is specified by the user. Mass per unit length The Line Type Wizard sets up mass for hoses and umbilicals as follows: Hoses For each type of hose the mass per metre has been estimated as a function of inner diameter giving: Umbilicals Mass per metre = 0.7253 ID te/m (for High Pressure) [55% 145%], Mass per metre = 0.3642 ID te/m (for Low Pressure), Mass per metre = 0.1844 ID te/m (for Fold-Flat). For the umbilicals the mass per metre has been estimated as a function of outer diameter giving: Mass per metre = 1.8 OD 2 te/m (for Umbilical) [35% 170%]. Axial and Bending Stiffness The Line Type Wizard sets up Axial and Bending Stiffness and Limit Compression for hoses and umbilicals as follows: Axial Stiffness For each type of hose the axial stiffness has been estimated as a function of inner diameter giving: Axial Stiffness = 2.80 x 10 6 ID kN (for High Pressure) [40% 160%],
w Axial Stiffness = 3.40 x 10 4 ID kN (for Low Pressure), Axial Stiffness = 6.56 x 10 3 ID kN (for Fold-Flat). For the umbilicals the axial stiffness has been estimated as a function of outer diameter giving: Axial Stiffness = 1.44 x 10 6 OD kN (for Umbilical) [15% 415%]. Bending Stiffness 377 System Modelling: Data and Results, Lines For each type of hose the bending stiffness has been estimated as a function of inner diameter giving: Bending Stiffness = 3 x 10 4 ID 4 kN.m 2 (for High Pressure) [45% 300%], Bending Stiffness = 6 x 10 2 ID 3 kN.m 2 (for Low Pressure), Bending Stiffness = 1 x 10 3 ID 3 kN.m 2 (for Fold-Flat). For the umbilicals the bending stiffness has been estimated as a function of outer diameter giving: Bending Stiffness = 3 x 10 3 OD 3 kN.m 2 (for Umbilical) [55% 240%]. Limit Compression As the bending stiffness is significant this is set to 'no'. 6.8.17 Modelling Stress Joints A tapered stress joint is a riser joint with a tapered cross-section. Stress joints are used to spread loads over a critical section of the riser. Stress joints are typically fabricated from steel or titanium. Stress joints are modelled in <strong>OrcaFlex</strong> using profiled line types. To model a stress joints you need to take the following steps: 1. Create a line type with the homogeneous pipe category and set the inner diameter, material data (Young's modulus, Poisson ratio, material density), hydrodynamic properties etc. 2. Create a Line Type Outer Diameter variable data source which defines the stress joint profile. 3. Set the line type outer diameter to refer to the variable data source of the profile. 4. Set the Line Type data item on the structure page of the line data form to refer to the profiled line type created above. Segmentation <strong>OrcaFlex</strong> line segments are straight, that is the diameter is constant over the length of the segment. Each segment in a profile line section has a diameter defined by evaluating the profile data at the mid-point of the segments. Because of this you typically need to use quite short segments to model the taper accurately. However, note that a stress joint is usually placed in a region of concentrated stress. Such regions also require short segments for accurate modelling and so the use of straight segments to model the profile does not in practice turn out to be a significant limitation. In order to determine segment length we recommend that you perform sensitivity studies on segment length. Arc length convention Profile arc length is defined relative to the start of the line section and increases from End A towards End B. To illustrate this consider a stress joint defined by the following profile:
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w Orcina Ltd. Daltongate Ulverston
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Contents 4 w 3.4 Libraries 40 3.4.1
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Contents 6 w 5.6 Dynamic Analysis 1
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Contents 8 w 6.5.23 Wave Scatter Co
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Contents 10 w 8.12 Results 444 8.13
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Introduction, Installing OrcaFlex
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Introduction, Parallel Processing M
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Introduction, References and Links
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Introduction, References and Links
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w 2 TUTORIAL 2.1 GETTING STARTED 21
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w 23 Tutorial, Dynamic Analysis sha
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w 3 USER INTERFACE 3.1 INTRODUCTION
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w Simulation Paused 27 User Interfa
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w Keys on Main Window New model Ope
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w Rotate viewpoint left (decrement
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w General: StaticsMethod: Whole Sys
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w A text data file saved by OrcaFle
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w 37 User Interface, Model Browser
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w Cut/Copy Cut or Copy the selected
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w 3.4.1 Using Libraries 41 User Int
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w 43 User Interface, Libraries Once
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w 3.5.1 File Menu New Deletes all o
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w New Vessel New Line New 6D Buoy N
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w 3.5.5 View Menu Change Graphics M
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w Preferences 51 User Interface, Me
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w 53 User Interface, 3D Views 3D Vi
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w 55 User Interface, 3D Views � D
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w 57 User Interface, 3D Views a lin
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w 59 User Interface, 3D Views � F
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w Replay Period 61 User Interface,
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w Frame interval in real time 63 Us
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w Numeric 65 User Interface, Data F
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w � For lines you must specify th
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w 69 User Interface, Results this i
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w 71 User Interface, Results Let th
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w 73 User Interface, Results remain
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w Results 75 User Interface, Result
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w Replays 77 User Interface, Graphs
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w Axes 79 User Interface, Spreadshe
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w Command Line Parameters 81 User I
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w Wire Frame Graphics Codec 83 User
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Automation, Batch Processing Multi-
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Automation, Batch Processing 88 w N
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Automation, Batch Processing Assign
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Automation, Batch Processing Line T
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Automation, Batch Processing SHEAR7
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Automation, Batch Processing PolarT
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Automation, Batch Processing Figure
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Automation, Text Data Files Data in
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Automation, Text Data Files Selecte
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Automation, Text Data Files SHEAR7L
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Automation, Text Data Files 4.3.2 A
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Automation, Post-processing 108 w F
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Automation, Post-processing 110 w N
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Automation, Post-processing Referen
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Automation, Post-processing Command
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Automation, Post-processing Figure:
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w 5 THEORY 5.1 COORDINATE SYSTEMS 1
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w 125 Theory, Object Connections Di
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w 127 Theory, Static Analysis Final
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w 129 Theory, Static Analysis metho
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w 131 Theory, Dynamic Analysis for
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w Static Starting Position Simulati
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w 135 Theory, Friction Theory The n
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w where μ = magnitude of the vecto
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w 139 Theory, Extreme Value Statist
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w where σ = GPD scale parameter ξ
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w 143 Theory, Environment Theory Th
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w where Pu(z) = Nc(z/D)su(z)D Pu-su
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w 147 Theory, Environment Theory
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w Repenetration Offset After Uplift
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w 151 Theory, Environment Theory sp
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w Extrapolation Stretching 153 Theo
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w 155 Theory, Environment Theory st
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w 157 Theory, Vessel Theory individ
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w 159 Theory, Vessel Theory RAOs ca
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w 161 Theory, Vessel Theory Notes:
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w 163 Theory, Vessel Theory ω is t
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w surge/sway/heave M M.L roll/pitch
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w 167 Theory, Vessel Theory that co
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w 169 Theory, Vessel Theory separat
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w 171 Theory, Vessel Theory At this
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w Segment 1 Segment 2 Segment 3 Act
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w 175 Theory, Line Theory � If to
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w where component of M2 in the Sx2
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w The hysteresis model is described
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w � (90,90,90) sets Ex along -GX,
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w = v1 + p' + ω×p Therefore its a
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w y End A Stress ID z Stress OD O S
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w 5.12.16 Hydrodynamic and Aerodyna
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w 189 Theory, Line Theory Another w
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w Drag Chain Seabed Interaction 191
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w 193 Theory, Line Theory OrcaFlex
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w 195 Theory, 6D Buoy Theory clashi
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w 197 Theory, 6D Buoy Theory For Lu
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w 199 Theory, 6D Buoy Theory (due t
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w 201 Theory, 6D Buoy Theory Note:
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w α is the angle between the relat
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w 5.13.6 Contact Forces Contact For
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w Dynamic Analysis 207 Theory, Winc
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w 209 Theory, Shape Theory Finally,
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System Modelling: Data and Results,
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Modal Analysis, Theory 432 w For si
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Modal Analysis, Theory 434 w This h
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Fatigue Analysis, Commands 436 w Fo
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Fatigue Analysis, Load Cases Data f
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Fatigue Analysis, Load Cases Data f
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Fatigue Analysis, Analysis Data 442
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Fatigue Analysis, Integration Param
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Fatigue Analysis, Fatigue Points Ba
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Fatigue Analysis, How Damage is Cal
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VIV Toolbox, Frequency Domain Model
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