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Appendix 1: List of Measurements and Outputs for Icebreaker Parametric Design with Orca3D (07 May, 2020)
All parameters described in this appendix can be discussed and clarified during the kick-off meeting.
The origin for all measurements is the intersection of the Forward Perpendicular (FP), Baseline (BL), and Centerline (CL), unless otherwise noted.
General/Principal Characteristics Output In addition to the parameters in the below table, the script shall export a GHS Geometry File of the hull form. The script shall run and export Orca3D hydrostatics at the design draft and other user-specified drafts.
| Parameter Description |
| Symbol |
| Units |
| Underwater Hull Volume |
| VolUW |
| ft3 or m3 |
| Length Overall |
| LOA |
| ft or m |
| Length at Waterline |
| LWL |
| ft or m |
| Beam at Waterline |
| BWL |
| ft or m |
| Midship Section Coefficient |
| CM |
| - |
*All values are to be calculated at the design waterline unless otherwise noted.
Outputs Required for Ice Resistance Calculations
| Parameter Description |
| Symbol |
| Units |
| Hull Wetted Surface Area below DWL |
| S |
| ft2 or m2 |
| Frame Angle from Waterplane to Shell |
| β |
| deg |
| Length of Parallel Section |
| LPar |
| ft or m |
| Length of Bow Section |
| LBow |
| ft or m |
| Waterline Angle at DWL, CL |
| α0 |
| deg |
| Waterline Angle at DWL, 1/8 Beam |
| αB/8 |
| deg |
| Waterline Angle at DWL, 1/4 Beam |
| αB/4 |
| deg |
| Waterline Angle at DWL, 3/8 Beam |
| α3B/8 |
| deg |
| Bow Flare Angle at FP |
| β 0 |
| deg |
| Bow Flare Angle at Station 2 |
| β2 |
| deg |
| Bow Flare Angle at Midship (Station 10) |
| β10 |
| deg |
| Height of Hull Bottom at Propeller Locations |
| hProp |
| ft or m |
*See Figure 1 and Figure 2 for visual description/definitions
Parameter Definitions:
· Length of Bow Section: Distance between the two locations defined below
· Forward Location = FP
· Aft Location = Longitudinal location where the angle between CL and DWL becomes less than 1 degree and the turn of the bilge is at least 0.8*(Design Draft) below DWL
· Length of Parallel Section: Distance between the two locations defined below
· Forward Location = Aft Location of Bow Section
· Aft Location = Longitudinal location aft of the Forward Location where the angle between the CL and DWL becomes greater than 1 degree
Figure 1 – Hull Angle Definitions (Lindqvist)
Figure 2 - Hull Angle Definitions (CG-459)
Outputs Required for Ice Structures Each parameter is defined in Reference 1.
The hull is divided into the below areas. The boundary of each area is defined in Reference 1 and shown in Figure 3. The surface area (in ft2 or m2) shall be calculated and output for each region and subarea.
Bow
B
| Bow Intermediate |
| Bottom |
| BIb |
The location of all boundary lines that separate the areas and subareas shall be output.
· Longitudinal location of the following:
· Forward-most point on the Upper Ice Waterline (UIWL)
· Bow-Bow Intermediate Boundary
· Bow Intermediate-Midbody Boundary:
· Midbody-Stern Boundary
· Vertical location of the UIWL and Lower Ice Waterline (LIWL)
· Vertical and Transverse coordinates of the boundary between Bottom and Lower Hull areas at all stations aft of the Bow Region
· Longitudinal, Vertical, and Transverse coordinates of the intersection of all subarea boundaries and the midship section The bow area is further divided longitudinally into four equally-spaced subareas between the forward-most point on the UIWL and the Bow-Bow Intermediate Boundary. At the mid length of each subarea, the below angles (defined in Figure 4) shall be measured at the UIWL and output:
| Angle Description |
| Symbol |
| Units |
| Normal Frame Angle at UIWL |
| β′ |
| deg |
| Waterline Angle at UIWL |
| α |
| deg |
| Buttock angle at UIWL (measured from horizontal) |
| γ |
| deg |
Figure 3 – Hull Area Extents (ABS)
Figure 4 – Hull Angle Definitions for Structures (ABS)
Outputs Required for Area/Volume and Compartments The parameters in the table below shall be provided for each individual deck, bulkhead, subdivision, and compartment.
| Parameter Description |
| Units |
| Total Enclosed Hull Volume |
| ft3 or m3 |
| Bulkhead Locations |
| ft or m aft FP |
| Deck Locations |
| ft or m ABL |
| Deck Volumes (assigned to lower deck) |
| ft3 or m3 |
| Subdivision Deck Areas |
| ft2 or m2 |
| Subdivision Volumes |
| ft3 or m3 |
| Compartment Deck Areas |
| ft2 or m2 |
| Compartment Volumes |
| ft3 or m3 |
| Innerbottom Volume |
| ft3 or m3 |
Parameter definitions:
· Subdivision: A space running from baseline to the uppermost deck between two transverse bulkheads, or between the hull and the forward-most and aft-most bulkhead.
· Compartment: An individual space bounded by a bulkheads fore and aft, and decks above and below, and the hull port and starboard. Compartments include the forward-most, aft-most, and innerbottom spaces that are bound by the hull on more than two sides.
· Innerbottom Volume: The volume of space inside the hull below the lowest deck image4.emf image1.tmp image2.png image3.emf