1、 1992-2011 Napa Ltd. All rights reserved.NAPA Online Manuals 2011.1Loading Conditions (LD)NAPA Online Manuals 2011.1Loading Conditions (LD) 1992-2011 Napa Ltd. All rights reserved.Table of Contents1 The loading conditions subsystem. 11.1 Definitions done under LD 11.1.1 Loading conditions 11.1.2 Lig
2、ht weight 11.1.3 Tank pairs 11.1.4 Tank supports 11.1.5 Loading priorities 11.1.6 Limiting curves for longitudinal strength 11.1.7 Free surface rules. 21.2 Analyses done under LD. 21.3 Installation 21.4 Connections to other subsystems 31.4.1 Summary. 31.4.2 Connection to table calculation. 31.4.3 Co
3、nnection to CR and DA. 31.4.4 Connection to grain stability 41.4.5 Connection to container loading. 41.4.6 Connection to weight calculation 41.4.7 Connection to the inclining test. 42 Basic concepts. 42.1 Purpose 52.2 Initial requirements. 52.3 Properties of loads. 52.3.1 The substance (LOAD) 52.3.2
4、 The location of the load 72.3.3 The amount of load. 72.3.4 Load types. 72.3.5 Mass loads. 82.4 Compartments open to sea and grounding 92.5 Interaction with the arrangement. 92.6 Combined loading conditions. 102.7 Lightweight definitions. 102.8 Auxiliary definitions. 102.8.1 Handling of free surface
5、 moments 102.8.2 Loading priority 112.8.3 Tank pairs 112.8.4 Tank supports. 112.8.5 Permissible strength values. 112.8.6 Permissible draughts. 122.8.7 Shear force corrections. 122.9 Calculation and output functions 122.10 Operations on sets of loading conditions. 133 Lightweight definitions 133.1 Ge
6、neral. 133.2 Definition of a lightweight case. 143.3 Lightweight distribution 143.3.1 Undefined distribution. 143.3.2 Total distribution by a curve. 143.3.3 Total distribution by elements 153.3.4 Distribution by elements and a curve. 15NAPA Online Manuals 2011.1Loading Conditions (LD) 1992-2011 Napa
7、 Ltd. All rights reserved.3.3.5 Distribution from weight calculation. 163.3.6 Dimensioning undimensional distribution curves 163.3.7 Lightweight elements handled by a table 163.4 Parameters for deflection 173.5 Center of twist. 173.6 Factors for combined stress. 173.7 Auxiliary commands 183.8 Storin
8、g the lightweight version in the database. 183.9 Leaving lightweight definition. 194 Defining loading conditions. 194.1 General. 194.2 LOAD command 194.3 Summary of LOAD command options. 204.3.1 Specifying the load type 204.3.2 Specifying the amount of load. 204.3.3 Specifying the location 214.4 Cha
9、nging the substance. 224.5 Changing the density in the LOAD command 224.6 Loading tank pairs 224.7 Special loading commands (MOVE, CHA and BAL). 234.7.1 MOVE 234.7.2 CHANGE. 234.7.3 BALANCE. 234.8 Loading message. 244.9 Mass loads 244.10 Defining deadweight constants 264.11 Adding result quantities
10、to the results list. 284.11.1 Existing quantities. 284.11.2 Quantities calculated in macros. 284.12 Container loading GUI. 284.12.1 Connection between a load case and a container load case 294.12.2 Activating the CL GUI 294.12.3 Layout of the CL GUI . 304.12.4 Selection of containers 314.12.5 Handli
11、ng of short/long container positions . 324.12.6 Administration 324.12.7 Hint for handling containers with different properties 324.13 Grain loading GUI. 334.13.1 General 334.13.2 Loading grain. 334.14 Permissible draughts. 334.15 Shear force corrections 334.16 Auxiliary functions. 344.16.1 Commands
12、DES and EDIT. 344.16.2 LIST PAR 354.16.3 Graphic feedback and graphic input. 354.16.4 Command WATCH 354.16.5 Events. 355 Handling load components in tables. 365.1 General. 365.1.1 Purpose. 365.1.2 Transfers between tables and the loading condition 375.2 Properties of the tables. 37NAPA Online Manual
13、s 2011.1Loading Conditions (LD) 1992-2011 Napa Ltd. All rights reserved.5.2.1 General. 375.2.2 Compulsory columns. 375.2.3 Other columns. 385.3 Dependence between quantities 385.3.1 Overview 385.3.2 Quantities related to the density. 395.3.3 Quantities related to the amount. 395.3.4 Load properties
14、used. 405.3.5 Loading time and rate 405.3.6 Derived load properties. 405.3.7 Checking the amount of load 405.3.8 Relation to other columns in the table 405.3.9 The dynamic dependence management. 415.3.10 Special questions for gauge values. 425.3.11 Special questions for free surface moments 425.3.12
15、 Compartments open to sea 435.3.13 Pressurised compartments (damaged). 435.3.14 Designing a table for mass loads. 435.3.15 Designing a table for both mass loads and loads in compartments. 445.4 Updating the table from the loading condition 445.5 Updating the loading condition from the table 465.6 Us
16、ing the arrangement plan. 475.7 Defining the automatic table connection. 476 Auxiliary definitions. 486.1 Tank pairs. 486.2 Priorities. 486.3 Permissible strength values 486.4 Tank supports 517 On calculation. 517.1 Calculation methods 517.1.1 Floating position. 517.1.2 The fixed trim method 527.1.3
17、 Stability curve. 527.1.4 Free surface moments 537.1.5 Longitudinal strength. 547.2 Calculation arguments 557.2.1 Arrangement 557.2.2 Calculation hull 557.2.3 Seawater density 557.2.4 Heeling angles. 557.2.5 Calculation method. 567.2.6 Asymmetry control. 567.2.7 Calculation mode 567.2.8 Lightweight
18、version. 577.2.9 Free surface rule. 577.2.10 Wave 577.2.11 Openings 577.2.12 Slack limit 587.2.13 Permissible strength values 587.2.14 Filling limits for free surface handling 587.2.15 Limits for longitudinal strength 587.2.16 Resetting arguments 587.2.17 Management of arguments. 58NAPA Online Manua
19、ls 2011.1Loading Conditions (LD) 1992-2011 Napa Ltd. All rights reserved.7.3 Storing results in the data base 597.4 Additional calculation control. 597.4.1 Force. 597.4.2 Calculate 607.4.3 Update 608 Free surface handling 608.1 General. 608.2 FRS command. 618.2.1 Parameter group 618.2.1.1 *CLASS . 6
20、18.2.1.2 LOAD 628.2.1.3 ALL 628.2.1.4 OTHERS. 628.2.1.5 (T1.Tn). 628.2.2 Parameter subgroup. 628.2.3 Parameter rule 638.2.3.1 IMO 638.2.3.2 REAL 638.2.3.3 DGZREAL 638.2.3.4 R50 638.2.3.5 it 638.2.3.6 MAX. 648.2.3.7 LLMAX. 648.2.3.8 ITREAL 648.2.3.9 REAL5. 648.2.3.10 FMAX. 648.2.4 Parameter info 648.
21、3 Free surface moment for mass loads. 648.4 Exceptions to free surface rules 658.4.1 Handling of exceptions in FSDEF task 658.4.2 Exceptions in tables 658.5 Polygon definition. 658.6 Slack limit. 668.7 Output and check 668.8 Examples 678.9 Free surface definition subtask. 678.9.1 Commands and defini
22、tions in the free surface definition (FSD) subtask 689 Listing functions 689.1 General . 689.2 Command LIST 699.3 Listing arguments 699.4 The command ASG (assign) 709.5 Command OUTPUT 729.5.1 Scope 729.5.2 Contents . 729.5.3 Layout . 739.5.4 Naming lists 749.6 Auxiliary listing functions 749.7 Tailo
23、ring list outputs 7510 Drawing functions. 7610.1 General 7610.2 Geometry oriented drawing. 76NAPA Online Manuals 2011.1Loading Conditions (LD) 1992-2011 Napa Ltd. All rights reserved.10.2.1 Drawing the arrangement 7610.2.2 Showing loads graphically 7610.2.3 Drawing mass loads. 7810.2.4 Automatic plo
24、tting of changed loads. 7910.3 Using multiple views. 8010.4 Drawing diagrams with PLD 8010.4.1 Plotting stability curves 8010.5 Diagrams with command PLOT. 8310.5.1 Frames 8310.5.2 Scaling 8410.5.3 PLOT STAB 8410.5.4 PLOT STR. 8410.5.5 PLOT LIMIT 8610.5.6 PLOT GCR, grain criterion. 8710.5.7 PLOT WL
25、8710.5.8 Plotting the ship in the actual floating position 8710.6 Adding drawings to lists 8811 Managing processes 8811.1 The process table 8911.2 Treating the time. 8911.3 Controlling quantities 9011.3.1 Columns related to quantities 9011.3.2 Target of quantity changes 9011.3.3 Quantity change even
26、ts. 9011.3.4 Default quantity 9311.3.5 Connected change. 9311.3.6 Time definition dependent on quantities. 9311.3.7 The C and T events 9411.3.8 Effect of maximum values. 9511.3.9 Various examples 9611.4 Order between the lines. 9611.5 Output of functions related to quantities. 9711.6 Alternative sce
27、narios 9711.6.1 Managing alternative scenarios 9811.6.2 Graphic representations of alternative scenarios 9811.7 Using a process table for controlling loading conditions. 10011.7.1 Initial values 10111.7.2 Properties controlled by the process table 10111.7.2.1 Loads in compartments 10111.7.2.2 Mass l
28、oads. 10111.7.2.3 Damage related properties of a compartment . 10211.7.2.4 Breaches. 10211.7.2.5 Grounding 10211.7.2.6 Arguments 10211.7.2.7 Special events. 10211.7.3 Grouping of events 10211.7.4 Generating a loading condition 10311.7.5 Loading condition properties as function of time. 10311.7.6 Sta
29、te dependent on the history. 10411.8 Short summary 10511.8.1 Columns. 10511.8.2 Event types 10511.8.3 Time definition 10611.8.4 Functions 106NAPA Online Manuals 2011.1Loading Conditions (LD) 1992-2011 Napa Ltd. All rights reserved.12 Commands, service functions and events. 10612.1 Administrative and
30、 general commands 10712.2 Definition of loading conditions. 11212.3 Calculation arguments 12412.4 Calculation and output 13912.5 Lightweight definition (subtask LGDEF). 15812.6 Free surface rule definition (subtask FSDEF) 16512.7 Service functions. 17112.7.1 Current loading condition. 17112.7.2 Load
31、ing. 18812.7.3 Administration. 19812.7.4 Drawing 19912.7.5 Table interface 20312.7.6 Lightweight elements. 20612.7.7 Various. 20612.7.8 Container loading 21012.7.9 Onboard-NAPA 21112.7.10 Functions related to process tables. 21912.7.11 Tide, grounding. 22312.8 Events 226NAPA Online Manuals 2011.1Loa
32、ding Conditions (LD)1 (228) 1992-2011 Napa Ltd. All rights reserved.1 The loading conditions subsystemThe main purpose of the loading condition subsystem (LD) is to handle definitions, administration and analysesrelated to loading conditions, i.e. for the ship where components dependent on the opera
33、ting conditions aredefined.Some of the analyses, such as intact stability criteria and damage stability are organized into own subsystems,accepting loading conditions defined under LD as input. Directly under LD, the ship can be studied when givencompartments are open to the sea.The main definition
34、function concerns loading conditions. In addition, the supporting definitions such as tankpairs, tank supports, loading priorities, free surface calculation rules, light weight are organized under LD. Thelight weight can also be handled with the separate weight calculation subsystem.1.1 Definitions
35、done under LD1.1.1 Loading conditionsA loading condition is defined by assigning loads, which can be loads in tanks or other compartments or loadsdefined independently. A special case is formed by container loads.1.1.2 Light weightThe light weight of the ship can be defined by giving its weight, cen
36、ter of gravity and a rule for its distribution,by giving separate light weight elements or by a combination of these.Alternatively, the light weight can be fetched from the weight calculation system.1.1.3 Tank pairsA tank pair is formed by two tanks, the load of which can be connected so that an equ
37、al load is assignedautomatically.1.1.4 Tank supportsA tank support is a construction supporting the tank. Its role in the calculations is to modify the way the weight ofthe tank contents affects the load on the hull. A tank may have several supports and the load may be distributedon the supports as
38、desired.1.1.5 Loading prioritiesLoading priorities are applied when a given load is loaded into a set of tanks in a single operation, and definesthe order in which the tanks are taken into use.1.1.6 Limiting curves for longitudinal strengthThe curves define the maximum allowed shear force, bending m
39、oment, torsion moment and combined stressas a function of x.NAPA Online Manuals 2011.1Loading Conditions (LD)2 (228) 1992-2011 Napa Ltd. All rights reserved.1.1.7 Free surface rulesThe free surface rules control the way the effect of free surfaces is calculated.1.2 Analyses done under LDThe followin
40、g calculations are handled by the loading condition subsystem:a73 weight and center of gravity for the total weight, for the deadweight and selected subsetsa73 floating position and related hydrostaticsa73 free surface corrections for each liquid loada73 GM and gz-curve for the loaded ship, properti
41、es of the stability curve with reference to IMO,a73 longitudinal distribution of weight, buoyancy, shear force, corrected shear force and bending momenta73 torsion momentsa73 combined stress, i.e. sum of bending moment and torsionmoments multiplied by certain factorsa73 deflection of the ship.a73 ap
42、plication of grain shifting moments (from GS)a73 behaviour when compartments are open to the sea1.3 InstallationAll functions of the loading condition subsystem are installed under task LOAD or LD. The main level of this taskcontains definition of loading conditions, calculation, output and auxiliar
43、y functions. It contains the followingfunctions as subtasks:a73 lightweight definition (LGDEF)a73 definition of free surface rules (FSDEF)a73 general drawing task (DR)a73 table calculation (TAB)a73 ship model (arrangements) (SM)a73 load parameters (LPD)a73 geometry definitions (DEF)a73 stability cri
44、teria (CR)a73 damage stability (DA)a73 container loading (CL)Definition of lightweights is installed as a subtask called LGDEF. (Before rel. 2001, the command was the sameas that of the argument, i.e. LIG).The general drawing task (same as task DRAW under GM) is installed as a subtask, for the purpo
45、se of allowingall drawing facilities to be used when adding graphics to loading condition documents. The most importantdrawing commands (SETUP, DRW, EDR, FILL) are available directly in the main task.In case parameters of load types need to be listed, defined or modified, the purpose definition task
46、 PD of SMcan be accessed as a subtask LPD. The SM task itself is available (subtask SM), but only for use of listingand auxiliary functions, not changing of arrangements. The need for the SM and LPD commands has beenreduced by the possibility to access the compartment and load properties using the t
47、able editor.The geometry definition task DEF is available as a subtask with the same name. This allows the geometry ofcompartments to be changed without leaving the loading condition subtask.This is not considered the normal context for modifying the ship geometry, but it makes it possible to testth
48、e influence of geometry changes on loading conditions.NAPA Online Manuals 2011.1Loading Conditions (LD)3 (228) 1992-2011 Napa Ltd. All rights reserved.1.4 Connections to other subsystems1.4.1 SummaryThe geometry subsystem (GM) provides the definitions of the hull and the compartments.The ship model
49、subsystem (SM) collects the pieces to arrangements, where the role of the compartments andtheir relevant properties are defined. The properties of the loads (substances) are also defined under SM.The general drawing functions of the geometry subsystem are available for graphic output where loads arepresented in connection with ship geometry.The light weight can be obtained from the weight calculation subsystem (WG).The container arrangements used for loading of containers are handled by the container loading (CL)subsystem. This subsystem also handles the container lo
