GHS Version 07.00 Update Features

GHS Version 07.00 Update

New features, changes, and bug fixes since version 06.70

Bug Notices for version 7.00
Note: Since this bug can cause incorrect results in certain stability evaluations, a corrected version, 7.04, is being issued to replace 7.00.

LIMIT RA command:

(a) LIMIT RA AT ang1 OR ang2

(b) LIMIT RA AT ang1 TO ang2

In GHS versions 6.74 through 7.02D the interpretation of these two commands was reversed. In other words, the "OR" keyword behaved as the "TO" and vice versa. Please check any work that you did with any version of GHS in this range and make sure that this LIMIT was not controlling any cases.

As described in the GHS User's Manual, the value of the righting arm (RA) is taken at ang1 unless,

in form (a) ang2 is greater than ang1

in form (b) ang2 is less than ang1

in which case the RA value is to be taken at ang2.

Note: Since this bug can cause incorrect results in certain stability evaluations, a corrected version, 7.04, is being issued to replace 7.00.

A bug involving the CRIT command has been found in GHS version 7.04J - 7.04V.

The CRIT command with the /SYMM parameter is not being properly recognized (it's actually being interpreted the same as /FLD). It has been corrected in version 7.04W.

See the update history section of the Customer Support Center for the latest available beta versions.

GHS 7.0 Shipments Completed

The GHS, BHS and BHS/Yacht version 7.0 update has been shipped to all users who are current with their Maintenance/Support subscriptions.

Unfortunately, a bug has been discovered in GHS 7.00 affecting one stability criterion limit. See Bug Notices, above.

A corrected version of GHS fixing this bug is available. Notices are being e-mailed or faxed to all users who received a copy of GHS that was affected. The notice contains options for receiving an update to version 7.04. If you have not received such a notice, please contact Creative Systems.

=========== MAJOR NEW FEATURES =========

A Windows 32-bit main program, report generator and print/plot utility are now included in addition to their DOS-based counterparts so that we continue to be compatible with all PC operating systems. When running under 32-bit operating systems (Windows 95, 98, NT, etc.) the speed and capacity are much greater than in any previous release.

An entirely new SE program is included with this release. It also supplies the main-program DISPLAY function. Please see the revised SE section in the manual for details.

Please refer to separate installation instructions. The files are compressed and require that the installation program be run in order to decompress and copy them to the program directory.

The more significant improvements and bug fixes are listed below. Please see the manual updates for complete descriptions of the new features.

Other Changes and Improvements

Flooded tanks now automatically assume the new density of the external environment when it is changed (via the WATER command). Formerly the density assigned to flooded tanks only changed in response to the TYPE and CONTENTS commands.
The actual volume in a tank when damaged or flooded can now be used to set the load when changing the type to intact. This is accomplished by adding the parameter /HBL to the TYPE INTACT command. The same operation can be performed in the Load Editor by entering "HBL" rather than "INTACT" when changing the type of the tank.
The density of the water used in WDF tanks can now be specified independently of the external water environment by means of an additional parameter on the WATER command: WATER spgr1 /WDF: spgr2 where spgr1 sets the external water environment and spgr2 sets the density used in WDF tanks.
A new Calibration Mode applies to tanks that have property tables augmenting the Shape in the Geometry File. (Property tables can be added to a geometry file by means of Model Converter.) Initially, Calibration Mode is "off" for all tanks. It can be turned on for all tanks having property tables or selected tanks through the TYPE CALIBRATE command. For example, TYPE (*) CALIBRATE "turns on" Calibrate Mode for all tanks that have property tables. The former tank type is not altered. For example, if the tank was FLOODED, it will remain so. Calibration Mode is "turned off" when the tank type is set to anything else. For example, TYPE (*) INTACT makes all tanks intact with Calibration Mode "off". When Calibration Mode is in effect for a tank, its name is preceded with a "#" whenever its properties are shown, such as in the STATUS report. This is not properly part of the tank's name, but it may be used in a TYPE command when the subject tanks are in Calibration Mode. For example, TYPE (#*) INTACT restores only those tanks which are presently in Calibration Mode to normal intact mode.
HMMT TANKS /CONST sets the heeling moment as a constant value derived from the present transverse weight moment of all tanks.
New parameter on LOAD EDIT command: /API forces API units when in metric mode, replacing KG/CM.
Load Editor now accepts "SEA" as a contents description for intact tanks, causing the contents to become the same as the external water environment. This has the same effect as using "SEA" in the CONTENTS command. (Subsequently changing the external water environment has no effect on the contents of intact tanks.) Load Editor displays the contents as "SEA" unless the external water environment becomes different, in which case it displays "SEA WATER".
GMT and roll period are no longer available in the Load Editor when the axis angle is not zero. Formerly it was available but misleading because it was not for the rotated axis.
The GHS/HS commands now show drafts in feet and inches if they are given in that format; e.g. 3'01, 3'02 ... 5'00 means every inch from 3 feet to 5 feet.
MAXVCG process - "Unverifiable LIMIT" error has been downgraded from fatal to warning.
A new parameter, "/LOOKUP", is available on the MAXVCG command which causes it to run in "lookup mode" where it looks up maximum VCG values in the table already calculated in the previous MAXVCG command (or composite of previous MAXVCG commands).
An improvement in the MAXVCG solving process results in faster convergence when some limits are insensitive to the VCG.
Other improvements in the MAXVCG process: more tolerance of large trim angles; finds the maximum VCG when the range of trim stability is narrow.
In the LIMIT command, a new keyword "PRE", standing for the pre-roll heel angle, is available. This is the heel angle that exists just before the command HEEL=*-ROLL is issued.
In the HMMT command, a new parameter, /POSTROLL, is available. This causes the heeling moment to be suspended until after the HEEL=*-ROLL command is issued.
A new LIMIT angle keyword "EQU0" refers to the equilibrium angle that would exist if there were no external heeling or trimming moments.
In Limit reports, "Deck Immersion" is now expressed as "Deck/margin Immersion".
The RA command /STOP parameter is now active with /LIM.
A further refinement in the RA procedure enables it to return limit angles which fall into a discontinuity.
In all reports where the "with DAMAGE" phrase appeared with either FLOODED or DAMAGED tank types, it now appears only when DAMAGED tank types are present. If FLOODED tank types are present but no DAMAGED types, the phrase "with FLOODING" appears. Likewise, the screen header now shows either DMGE or FLD in the main environment, and DAMAGE or FLOOD in the Load Editor. The DECK type now causes "with WATER ON DECK" to appear unless other tanks are DAMAGED.
In case the "with FLOODING" or "with DAMAGE" in table headers is objectionable, the GHS, RA, CC, MAXVCG and DAMSTAB commands now allow a /BENIGN parameter to avoid having those words appear.
New LS report format showing percentages and limits for shear and bending moment. Activated with /LIM parameter on LS command.
There is now a capability for dual shear limits based on the sign of the bending moment. LSLIM SHR now accepts the "l1 & l2" format as used with LSLIM MMT. However the signs on the l1 and l2 values refer to the sign of the bending moment: negative values indicate the shear limit (for both positive and negative shear) to be used where the bending moment is negative (sagging).
LS with frames now includes the exact frame locations in the original load curve to ensure the best possible accuracy at those points.
The LS command operates normally in the absence of a .FRA file when the /FRA parameter is present.
Kilonewtons are now available as a units setting. UNITS KN sets the units used for weights and forces to kilonewtons. This is applicable to LS reports and should not ordinarily be used for other reports. It also affects the units for SMOD (M^3) and the stress and elasticity modulus parameters on the LS command (megapascals = 1000 KN/M^2).
Bulkhead shear force correction is now available. A shear force correction factor is carried in the geometry file in the part record, where it follows the sounding tube information (if any) and is introduced by a line containing only "-1". If this factor is present, shear forces over the length of the tank are modified by the addition of a linear function which is one-half of the original change in shear over the length of the tank times the correction factor. This correction is applied automatically unless a /NOCORrect parameter appears on the LS command. The correction factor is calculated and added to the geometry file using Part Maker.
A new command, TORQUE, is included in the LS module. It produces a table and plot of twisting torque due to differences in weight and buoyancy distributions.
DAMSTAB /SDIC now includes the revised Required SDI applying to vessels between 80 and 100 meters Ls (IMO Regulation 25-3 effective 7/98).
DAMSTAB /SDIP can now be used for the full (not simplified) IMO resolution A265(VIII).
DAMSTAB no longer stops with an error message when longitudinal instability is encountered.
WRITE (LOADS) now includes heel and trim angles for frozen tanks.
Reports can now be printed with boxes drawn around tables and headers.
RG.EXE is obsolete; its functions are now handled internally within GHS during REPORT, RG, or PRINT command processing.
The PRINTER command now supports network printers (e.g. PRINTER \\server\printer), while PRINTER ON uses printer port set in PRINTER CONFIGURE by default rather than LPT1.
Plots now use a default left margin of 0.5 inches instead of 0.25 inches, in order to allow space for looseleaf binder punch holes and to avoid memory overflow problems on some old printers. The REPORT and RG commands now have a new parameter /MARGIN to adjust this margin manually.
The Report Generator was made tolerant to Cross Curve tables where data is missing in the flood columns, and boxing performance was improved for large Cross Curve tables.
RG no longer waits before scrolling unless /WAIT parameter is used.
PRINT command recognizes /MARGIN and /WIDTH parameters same as REPORT and RG.
REPORT CLOSE in keyboard mode requires "Print report?" confirmation before printing; printing occurs automatically in runfile mode. Likewise, when redefining the REPORT file, printing requires confirmation in keyboard mode, but it is always suppressed in runfile mode.
PRINT /MARGIN has two different meanings. If a filename is given, /MARGIN parameter is a size less than 1 inch (same as for REPORT and RG); otherwise, /MARGIN parameter is an integer number of characters.
PRINT CONFIGURE /16 causes PP instead of PP32 to be used for printing.
Vessel names appear boldface in the header of reports printed through PP32. REPORT and RG have a new parameter /COUNT, which includes the total page count in the header (e.g. "Page 1 of 10", "Page 2 of 10", etc.).
DIR command now omits files ending in ".$$$" unless explicitly specified.
The configuration information is now stored is a special directory off the root of the same drive where temporary files are stored. This allows the program directory to be made read-only if desired.
SHELL command looks in the GHS program directory as well as the path.
The mouse can now be used to select a row and field in the Load Editor, select MENU lines and to click the "SPACEBAR to continue". Commands and words from the screen can now be brought to the command line at the present cursor position by clicking on them with the mouse. However, if the mouse is dragged during clicking, then the selected text is instead made available for copying to the clipboard by pressing Ctrl-C or choosing "Copy" after right-clicking. (32-bit mode only).
The GHSSHELL environment variable, if set, specifies the command processor and switches to override normal shelling to auxiliary programs.
The SHELL command has additional parameter options for diagnostic purposes: (1) SHELL /V shell command - specified shell executes command verbatim; (2) SHELL /VC [/K] command - default shell executes command verbatim; (3) SHELL /VE [/K] command - CMD.EXE shell executes command verbatim. If /K present for (2) or (3), command waits for EXIT before returning.
If a geometry file exists in the key file directory instead of the current directory, READ copies it into the current directory so it can be shared with shelled programs like PM and SE.
If the program starts in the key file directory and then does CHDIR to another directory, READ can now find geometry files in the key file directory.
Multiple geometry files can now be listed in the READ command.
SCREEN MIN, SCREEN MAX, and SCREEN NORM commands minimize, maximize, and restore the window in 32-bit mode.
General Load Monitor is now a separate program GLM.EXE, identified as GLM at the top of the program, with a new Longitudinal Strength Graph display option not contained in GHS.
SE file [part[\component]] reads and edits the specified file and optional part. If file is not specified, SE reads the current geometry file, and upon return the main program automatically reads the last geometry file written by SE (if any).
The maximum allowed height of the wind pressure profile (WIND command) has been increased from 100 to 200 meters.
The maximum number of tank loading levels obtainable from the TC command has been increased to 1001. However, plots will not be produced if the number of levels exceeds 100.
The TC report when using soundings in metric units shows millimeters for soundings rather than centimeters as formerly.
The number of decimal places carried during variable calculations in the SET command was increased to 5.
The maximum number of macros in 32-bit mode has been raised to 200; the maximum macros in 16-bit mode remains at 120.
A new integer system variable DAMSTATE contains 1 if there are any flooded- or damaged-type tanks; otherwise it contains 0.
Recognition of "hardware lock" dongles over a network is now possible.

======= Bug Fixes =======

A bug in the calculation of free surface moments for empty tanks in SPILLING mode was corrected. The free surface moment obviously should be zero but it was showing up as a nonzero number in the STATUS report.

WDF tanks in STATUS TANK:BRIEF were having their seawater represented twice. Also STATUS WPL was showing WDF tanks even when empty or full.

Solving with DAMAGED-type tanks now avoids "negative waterplane" errors.

In some cases the HF termination angle in a LIMIT command was being interpreted as DI.

MAXVCG was not handling the direction of heel properly with very small but nonzero equilibrium heel angles.

MAXVCG with varying ROLL (i.e. ROLL IMO) and relatively small heeling moments was sometimes not converging. The result was VCGs which were obviously too low.

Long command lines (greater than 256 characters) were being truncated in some cases.

The Load Editor was not properly handling frozen tanks with sounding tubes: soundings were not being correctly translated to loads, especially when the tank location was a great distance from the origin in the presence of large trim.

Load Editor SOLVING is now more sensitive to small changes in loads.

Model Converter command lines longer than 80 characters were being truncated when specified inside run files; this condition has been corrected.

The specific gravity table was not being properly reinitialized after a failed READ command.

Improved and corrected report formatting details. Corrected occasional appearance of extraneous trailing characters when picking words from the screen with the arrow keys.

In the RA command with nonzero AXIS the floodpoint height was sometimes unreliable near the downflooding angle.

When the RA curve is discontinuous due to a sudden trim shift or damaged tank flooding, the second intercept was not being identified, causing limits referencing RA0 to be undefined.

Longitudinal Strength with large distributed weights in addition to light ship was sometimes producing a "Weight Center Discrepancy" error.

DAMAGE type tanks were causing LS to abort with "PSI" error messages.

DAMSTAB was not progressing through all divisions when the divisions were not numbered starting with 1.

DIVISION /FLD:n was changing the type of critical point n to FLOOD if it was TIGHT.

A READ command containing a path given at the PROJECT prompt is no longer mistaken for a project directory specification.

Correction made to accept a colon or equal sign after the /PEN parameter on the GROUND command. Before this correction it was shifting the first parameter after the /PEN to the second parameter place.

Light ship weight curve terminating with a zero wt/length was giving zero weight.

ENTER command now correctly deletes temporary .RUN file even when multiple instances of GHS are running on the same machine.

Picking items from the screen during an INPUT command sometimes failed to access columns directly above the input field.

Corrected the tendency to miss slash parameters when not preceded by a space.

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