HECSALVCharles Dorger Fall 2009 1 Contents 1 Importing Your Model into HECSALV 2 Tables 2.1 Hydrostatic Table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Bonjean Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 Cross Curves Curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Compartments 4 Floodable Length 5 Damage Stability 6 Conclusion 3 16 16 18 20 23 26 30 37 2 Today, we will be covering how to use HECSALV. HECSALV is a computer program specializing in Naval Architecture design work. Some feature such as damage stability and floodable length is easier to use in HECSALV rather than in Maxsurf. This tutorial will cover how to import your model. 1 Importing Your Model into HECSALV We will start with the R/V Lemuria’s Hull: Figure 1: R/V Lemuria Hull Select the hull and then choose Tools/Attach GHS Data. GHS data is another way of importing hull forms. It captures the shape of the hull by either using a default or user defined number of sections. 3 4 . Start by choose Hull Items.Figure 2: Tools Menu A menu will then appear. This should then appear: 5 .Figure 3: Attach GHS Data Window Then select Add Part and select your hull. Now you can leave the default selection. I choose the centerline option.Figure 4: GHS Data You will notice that pink stations have appeared. This is because the bow is more defined and takes more stations to correctly define it. As a personal preference. since most hulls are symmetric and HECSALV should recognize that. Select Edit Shape and you should see this: 6 . Nota Bene Notice how the bow is more pink than the stern. Nota Bene Sometimes only half of the hull stations will be selected. This is fine. or you can define how many stations you want to use. Figure 5: Attach GHS Data Window If you uncheck Refine Stations. Nota Bene Be sure to select Create Stations after you change the number of stations!! You will now notice that the number of stations has drastically changed. you can input the number of stations you want. For HECSALV you want to input an odd number of stations. Under the file menu.gf file. I’m going to change the number of stations to 255. Now select the entire hull. Nota Bene gf means geometry file. Change the file type to a . select Export Selected. 7 . We will cover the other HECSALV applications in a different tutorial.Figure 6: Save Window Now its time to open HECSALV. This can be done by going to Start/ Courseware Applications/ NA470/ HECSALV/ Ship Project Editor. Figure 7: Start Window Cancel out of the opening menu. Go to File/ Import: 8 . Figure 8: File Menu Be sure to change the file type to .gf in order to open your saved hull form. 9 . Figure 9: Import Window You will then see this: 10 . BE SURE TO ENTER THE LBP IN FEET! This is part of the program import/export system. lets make sure the reference point and units are correct. Go to Tools/ Options. Before we do anything.Figure 10: Geometry File Options You want to be sure your reference is from the FP. 11 . Nota Bene Don’t change the units from feet. Enter your length between perpendiculars. Now lets go to References. Change that to FP. Notice the Longitudinal is MS . Now select OK. so lets go there first and make sure the units are correct.Midship.Figure 11: Options Window There is a tab for Units. 12 . Double click on Particulars in the upper left. This can be done by selecting the MS and using the drop down box that appears. 13 .Figure 12: Design Particulars A menu will open that shows all your information in the units that your Rhino model was in. We will now save our file: File/Save As. After you choose where you want to save it a menu appears where you can make comments of changes in this version: 14 . draft and the design draft line. We are almost done.Figure 13: Design Particulars You will need to input the beam. Figure 14: Save Window 15 . 16 . 2. A dialog box should appear with the following options: • General . its 0. If it was forward a “F” would appear.1 Hydrostatic Table To generate your ship hydrostatics go to Tables/Generate Hydrostatics: Figure 15: Tables Menu Nota Bene Switching from the R/V Lemuria to a container ship hull.17A where “A” is aft. change reference point. density and heel • Drafts . Similarly in the Port/Starboard cases a “P” would appear for Port and a S for starboard.Trim.Change the number of drafts you want to analyze • Trim Corrections Nota Bene If you are unsure of the coordinate system in HECSALV.2 Tables This section discusses how to create tables in HECSALV. it should tell you when you type in a number. Notice in Figure 16. select the Hydrostatic folder and an item called “Hull” will be there.Figure 16: Hydrostatics Generation Options When the values seem reasonable then click on “Generate”. Click on the “Hull” item in order to view your results. A series of tables will come up describing the hydrostatics of the ship at different drafts: 17 . After a few minutes a new option will appear: Figure 17: Explorer Menu Under Tables. Figure 18: Hydrostatic Results 2.2 Bonjean Curves To generate the Bonjean Curves go to Tables/Generate Bonjeans: Figure 19: Tables Menu A dialog box will appear: 18 . When you are satisfied with the drafts.Figure 20: Bonjean Generation Window You can adjust the drafts at which your ship will be analyzed. Select it. select generate. 19 . Nota Bene Recall that Bonjean Curves are used for describing station area curves. Again on the side a Bonjean Curve option will appear. By copying the data into excel you can select the stations to plot. 2.Figure 21: Bonjean Results Since there are hundreds of stations describing your ship. there are hundreds of curves to describe the stations.3 Cross Curves Curves To generate the Cross Curves go to Tables/Generate Cross Curves: Figure 22: Tables Menu 20 . 21 . Again on the side a Cross Curve option will appear. When you are satisfied with the displacements and angles. TCG and Pole Height • Displacement/ Angles . Select it.A dialog box should appear with the following options: • General . trim GMt or KG. heel direction. If you set the Pole Height to zero then you must make a correction.Change the number of displacements and heeling angles • Downflood Points . select generate. If Pole Height equals the KG then you can plot the curves as your GZ curves.Density. Nota Bene Recall from class about the Pole Height.Points vulnerable to flooding Figure 23: Cross Curves Generation Window Nota Bene You only need the GMt or the KG. Figure 24: Cross Curves Results Now you can create your Righting Arm curve. 22 . Figure 26: Table Generation To create the departments. Go to Geometry/Generation Tables. 23 . simply double click on the box next to the label. Figure 25: Explorer Options In the empty line type in a label for your compartments.3 Compartments Now lets divide the ship into compartments. This will be usefull for the Damage Stability information. When you are finished select the generate button in the lower left corner. Figure 28: Compartment Generation After you have generated all your compartments. Remember you need to account for all the space so don’t don’t forget about the area forward of the collision bulkhead and aft of the Aft-peak bulkhead. you will be able to see the compartments in the general view of your ship. 24 .Figure 27: Compartment Generation Now input all the different spaces of your ship. Figure 29: Compartment Results 25 . 26 .4 Floodable Length Do a search for “Floodable Length”.shp” file to start the process. Figure 30: Start Menu Import your “. Here you can change your reference point. Figure 32: Definitions Enter the permeabilities you wish to check. 27 . Nota Bene Unlike in the Ship Project Editor. You will want to make sure your reference point is from the FP to match the rest of your project.Figure 31: Floodable Length Window First go to Definitions/Basic. Check with the regulations and the Coursepack to verify the condition you need to meet. Next go to Project/Units. you will need to double click the reference you want. go to Results/ Basic. When you are finished go to Calc/Run Calc. After you input one bulkhead a new space will appear allowing another bulkhead to be inserted. When the program finishes. The process will take a couple minutes to finish. Figure 34: Bulkheads Input your bulkheads. 28 .Figure 33: Units and Coordinate System Next go to Definitions/Bulkheads. Figure 35: Floodable Length If your bulkheads do fail you can change them without recalculating. 29 . The time spent calculating was towards forming the permeability lines. be sure to have created the compartments in your design.shp” ship design file. Start by searching for “Damage Stability”: Figure 36: Start Menu Select the Damage Stability program and it will prompt you to select your “. 30 .5 Damage Stability Nota Bene Before you start this program. Figure 38: Damage Stability Window 31 .Figure 37: Damage Stability Window First go to Project/Units/Prec. Here we can change the units and coordinate system. Now we will go down the different options of the “Definitions” drop down menu. Nota Bene For NA470 you will want to use the Deterministic approach. Like in the Floodable Length Program. You will also need the GMt or the KG and the TCG. Next go to Project/Stability Criterion. you need to double click the coordinate system you would like to use. I have some papers you can look at. select “OK”. 32 . If you are interested in the Probabilistic approach. Drafts Here you can set the testing drafts. After you have selected your criteria. Figure 39: Project Criteria Here you can change the criteria requirements. You can test a series of compartments by selecting more compartments. Simply double click on the compartment that you wish to test.Figure 40: Drafts Compartment Status Here you can set whether a compartment is damaged or intact at the time of the test. Figure 41: Compartment Status Damage Cases Here you can change which compartments get damaged in the tests. 33 . 34 . Your compartments are further defined to be used in the probabilistic equations. Permeability Definition Here you can set the permeabilities of the different compartments. Figure 43: View Damage Cases Subdivision This is used in the Probabilistic approach. You can use the arrows to switch between cases.Figure 42: Damage Cases View Damage Cases Here you can view the damage cases you selected in the option before. simply go to tools/Force Update or Force Complete Recalc. File/Print. The calculations should take less than a minute. Go to 35 . Figure 45: Densities Now when the drafts and damage cases are set the program will begin to start its calculations. If you need to restart the calculations. The Results can be viewed in either “Summary Results” or “Detailed Results”. A more convenient way to view your results is to through the print preview option.Figure 44: Permeability Definition Densities Here you add the density of the fluid inside any tanks in the model. Figure 46: Printing Options By selecting what you wish to see. 36 . It is somewhat easier to navigate these results than the “Summary Results” or “Detailed Results”. you can “preview” the results. 6 Conclusion Congratulations! You now have seen a basic overview of HECSALV. you will learn more of its quirks. Good Luck! 37 . By continuing to play with the program.