GHS BULLETIN

GHS BULLETIN Building a SWATH

01/1991

Part Maker is capable of assembling components into complex models. The following example is a run file which builds a SWATH starting from two files, STRUT.GF and HULL.GF which contain single-component models of the strut and the pontoon hull, respectively (both are assumed to be symmetrical about their own centerplanes). It is assumed that the part name on each file is HULL so that one of them will have to be renamed before the other file is read.

The techniques demonstrated here can be extended to much more complex situations.

 READ STRUT.GF      `This file contains one strut as a part named HULL.

 CREATE TEMP        `In order to avoid a part name conflict we now effectively
  CLASS HULL        `rename the strut part from HULL to TEMP.
  COMPONENT TEMP
  SHAPE HULL\HULL
 /
 DELETE HULL

 READ HULL.GF       `Now we read the file containing the hull.

 CREATE HULL\STRUT  `Just to make things more tidy, move the strut over to
  SHAPE TEMP\TEMP   `the HULL part.
  FIT HULL
 /
 DELETE TEMP        `The TEMP part can now be deleted.

 CREATE SWATH       `Let's call the part containing the final assembly "SWATH".
  CLASS HULL
  COMPONENT DECK     `Create the deck component.
  ENDS -60,60
  TOP 30
  BOTTOM 25
  OUTBOARD 28
  COMPONENT S-HULL   `Create the starboard hull component.
  SHAPE HULL\HULL
  VECTOR 0,20,0      `This moves the CL component S-HULL.C over to the side.
  COMPONENT P-HULL   `Similarly for the port hull.
  SHAPE HULL\HULL
  VECTOR 0,-20,0
  COMPONENT S-STRUT  `Same idea for the struts.
  SHAPE HULL\STRUT
  VECTOR 0,20,0
  FIT DECK           `But make sure the struts don't overlap the deck.
  COMPONENT P-STRUT  `Similarly for the port strut.
  SHAPE HULL\STRUT
  VECTOR 0,-20,0
  FIT DECK
 /
 DELETE HULL        `Now get rid of the original HULL part.

 DISPLAY
 WRITE SWATH.GF
 QUIT

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