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We are committed to provide our customers with the best products. Currently, we are working on the following:

 

FastShip & FastYacht

We now have a new version, Fastship 6.1.30, with the following improvements and new features:

  • Hydrostatics Defaults changed to correspond more with US definitions and standards.
  • Hydrostatics output labels changed to agree with ATTC definitions; this will mostly be transparent to users, other than "CPL" for CP, since the ATTC definitions agree largely with those commonly used in the US.
  • Hydrostatics calculations corrected to provide better values for metacentric height; previous versions assumed if a center of gravity was not provided that metacentric height was to be calculated from the waterline. The new version uses KM (from the keel at the station of maximum area).
  • Hydrostatics calculations modified to refer to the station of maximum area.
  • Algorithms to create a PMF file for a user hull are included. These algorithms have very limited capability and generally only provide the beginnings of a PMF file. They will be effective on a hull that is one surface, with the waterline at the Z=0 level, that already has the topology of a parallel middle body with the 5 relevant columns exactly the same in y and z for every net row. Alion intends to improve this in later releases and hopes the limited feature will still provide the beginnings of a PMF file that can later be edited manually to equip a new hull for parametric use with the Fastgen macros. (Note: the PMF file export will not work for all users, only for those who have the "Parametrics/Hull Library" option.)
  • The name "Proteus Engineering" is being de-emphasized as Alion integrates the subsidiary it purchased several years ago. Accordingly, the name has been removed from the logos displayed in the software and the location of the software has been renamed to C:\Program Files\Alionscience\Fastship 6. This makes it even more important that previous versions of the software be removed using "Add/Remove Programs" on the Control Panel before loading Fastship 6.1.30. However, the Proteus Engineering Web site will continue in use for downloads and information on the software. Support questions may continue to be addressed to proteussupport@alionscience.com. These names will eventually be phased out but should continue working for a substantial time.

 

VisualSMP

 

 

Improvements in Version 3.2 (most recently released): 

 

1.   In version 3.1 and earlier, 0 deg and 360 deg heading cases were doubled counted in Operational Index (OI) calculations. In version 3.2 and later, 360 deg heading cases are excluded because they are the same as these 0 deg heading cases;

 

2.   In version 3.1 and earlier, the user would lose all of his/her polar plots and Operational Index (OI) specifications once VisualSMP exited from polar plots. If the user wanted to reproduce the same polar and OI plots for a different sea state, she/he had to repeat the same specifications all over again. This lack of 'memory' of VisualSMP was sometime frustrating and annoying.

In version 3.2 and later versions,  VisualSMP has a macro writing and reading capability to fix that. VisualSMP allows the user to save his/her existing polar/OI specifications to a text file. The user is able to open the text file to load the previously saved polar/OI specifications. For example, for a certain operation that has limits on ship roll angle, pitch angle, vertical acceleration, deck wetness and MII (Motion Induced Interruption), the user make these specifications once (for one sea state) and save them in text file. If the user wants to do the same polar plots and OI calculations for a different sea state, she/he can simply reuse them by opening the text file. This file may also be used for any other ships.

       The mechanism to save, reload and modify polar plot conditions is accomplished by the buttons and text window in the upper right coner of the Speed Polar Plot Conditions window.

The user can type in the file name (including path) or click the “Browse” button to pick a file. The “Write Sea States and Response to File” button will write all the shown responses and related information to the specifed file. The “Add SS+Responses From FIle” button will load/append all the sea state and responses from the file. The “Add Response Only From File” button will load/append the response only and the wave condition will use the one specified in the “Wave Height and Modal Period” pull down combo box

 

3.   From Version 3.2 and forward, VisualSMP GUI has a new feature to visually highlight the current offset point in blue to distinguish it from other points. To try this new feature, first go to View, set the view to Bodyplan. Then go to Edit -> Sections. Double click any station and anthor dialog box will pop-up with all the offset points of the chosen station listed. These offset points will be marked as red dots in the view. Click any offset point from the list, this current offset point will be highlighted as a blue in the body plan view

 

4.   From Version 3.2 and forward, VisualSMP GUI has a new feature for creating (add) a bilge keel. When a new bilge keel is added, VisualSMP will automatically add all the stations that are inbetween the specified forward and aft bilge keel stations to the bilge keel trace list. It will set the (halfwidth, waterline,angle) to (0,0,0).  The user may use the next two new features to modify these values visually and automatically.

From version 3.2 and forward, VisualSMP GUI will have a new feature which helps the user to visually modify/define a bilge keel trace point and angle. The user will be able to visually specify the bilge keel position (attachment point) for each station. The GUI will automatically calculate the bilge keel angle, either along the local surface’s normal direction or along the line connecting the attachment point and the roll center if the position of the roll center is specified.

Bilge keel has to be created before its trace point can be modified (Edit -> Bilge Keel, specify the fwd Station and aft station, set the width to 0 for the time being. It will be reset once all the trace points are modified);   Edit -> Sections, double click the desired station number, the "Section Offsets" window will pop-up;  Click on any offset point from the list and the point will be highlighted on the view.

Once the bilge point is chosen, click the 'Modify' button and the 'Section Point' window will pop-up; Choose "Bilge Keel Normal to the Local Surface" or "Bilge Keel Through Roll Center". If the later is chosen, the user has to specify a roll center height. Choose a bilge keel ID. The user may also choose to change the offset point. If you presss the "OK" button, the bilge keel trace point at this station will be modified to this particular point. The bilge keel angle at this station will be automatically calculated. 

If the user wants the bilge keel to be in the middle of two points, highlight the upper point, click the 'Add' button and the 'Section Point' window will pop-up; check the 'Interpolate' box and click 'OK'. A new point will be added to the offset table and it will be the bilge keel trace point at this station.

If one does not want to modify the bilge keel position at this station, one needs to make sure that the 'No bilge keel at this point' be checked.

The bilge keel options, the roll center height and the bilge keel ID will remain the same until they are changed. Presently, VisualSMP offers these different ways to automatically calculate the bilge keel angle. However, the user may go to the bilge keel trace editing directly to specify another value

 

5.   In Version 3.1 and earlier, the STH "RunOptions" numbering could be messed up in certain circumstances. Once the numbering is messed up, the output file (*.csn, *.cos, *.dat, *.ost) renaming could also be messed up. This problem has been fixed now.

 

6.   In roll iteration which employed a spline interpolation was not robust enough in some rare cases. It was in general good enough for quaquatic damping iteration. In the case of GZ curve of a highly flares ship, the spline interpolation scheme may fail. A more robust roll iteration scheme is now incorporated in Version 3.2 and forwar and fixes the problem.

 

Improvements in Version 3.1   

  1. Quasi-nonlinear roll restoring force. VisualSMP, like other frequency-domain ship motion programs, assumes linear restoring forces. This is the so-called 'wall side' assumption. To increase accuracy, especially for low freeboard, tumble-home or highly flared ships, the new version will use quasi-nonlinear roll restoring force. The roll restoring force will be based on a user-input GZ curve.  
  2.   In the irregular wave module, the calculations for all the 11 members of the Ochi-Hubble 6-param family of spectra will be carried out and output accordingl.
  3. In regular wave module, the number of frequencies in 2D calculation will be increased to 25. This will enhance the accuracy of 2D and 3D hydrodynamic coefficients, forces and moments. The regular wave module will take longer to finish. However, the calculation will still be fast enough that it will not be a concern in normal circumstances.
  4.  Maximum number of speeds is set to 11 instead of 8. This will be been implemented in both regular wave module and irregular wave module calculations as well as post-processing.
  5. In speed polar plots, the speed increments for the polar plot have been refined to 2, 3 and 5 knots instead of 2, 5 and 10 knots. The default speed increment is set to 5 knots instead of 10 knots.
  6. The polar plot contours are calculated and drawn at a much smaller intervals, about half of what it was before. The combination of allowing 11 speeds to be calculated and a finer polar plot speed increments significantly enhances the accuracy of the contour calculation and polar plotting.
  7. Other improvements to the GUI

   

Copyright © 2012 Alion
Last modified:   May 16, 2012