Skip site navigation (1)Skip section navigation (2)

FreeBSD Manual Pages

  
 
  

home | help
SECPASS(1)			    BRL-CAD			    SECPASS(1)

NAME
       secpass - interrogates an mged file to obtain the conductivity table of
       the PRISM-ready input file or a generic thermal data file

SYNOPSIS
       secpass model.g objects...

DESCRIPTION
       Secpass is an interactive program used to create	a conductivity table
       for the PRISM-ready input file (when used in conjunction	with firpass)
       or a generic thermal data file. The conduction approximation is based
       on the following	formula	from the PRISM manual.

		RK(i,j)	=	      1
			 ---------------------------
			   L(i)/K(i)A +	L(j)/K(j)A

		RK(i,j)	- conductivity between region i	and j
		L(i)	- conduction path length of region i
		L(j)	- conduction path length of region j
		K(i)	- conductivity of material of region i
		K(j)	- conductivity of material of region j
		A	- shared surface area

       The conduction path length is a distance	between	the centroid of	the
       region and the shared surface. The user may select the average, root
       mean squared (rms), minimum, or maximum distance	for the	length.

       The following information about each region is obtained from secpass
       when creating a PRISM ready file.

		number (same scheme as in firpass)
		number of region there is conduction between
		conduction

       The following information about each region is obtained when creating a
       generic thermal data file

		number
		number of adjacent regions
		shared area of each adjacent region (m**2)
		conduction distance (m)

EXAMPLE
       The following is	an example from	an interactive session.

	   $ secpass test.veh.g	vehicle	air
	   Write output	to standard out	(0) or a file(1) not at	all (2)?  2
	   Enter name of file that has second pass information
	   in it (15 char max).	 veh.f.2nd
	   Enter type of output	file to	be generated.
		 0 - PRISM File
		 1 - Generic File
	   0
	   Enter name of file to be created for	PRISM conductivity
	   information (15 char	max).  veh.s.con
	   Which release of PRISM is being used, 2.0 (2) or 3.0	(3)?  3
	   Which length	calculation should be used when
	   computing conduction
	   between regions?
		1 - average length
		2 - rms	length
		3 - minimum length
		4 - maximum length
	   3
	   Enter name of file to be created for	conductivity
	   table (15 char max).	 veh.s.tbl
	   Enter name of material file (15 char	max).  prp
	   Enter name of error file to be created (15 char max).  veh.s.err
	   Should there	be 3 sets of orthogonal	rays fired (0) or 1 set	(1)?
		3
	   3 sets of orthogonal	rays will be fired.
	   Database title:  test vehicle for use with irprep programs
	   Number of regions in	mged file:  21
	   Mallocing arrays.
	   cond	malloced
	   loop	malloced
	   All variables zeroed.
	   second pass file opened
	   The number of regions read was 21
	   Center of bounding rpp ( 356.500000,	0.000000, 1250.000000 )
	   Length of diagonal of bounding rpp:	3829.051456
	   Minimums & maximums of grid:
	     -3472.551456 - 4185.551456
	     -3829.051456 - 3829.051456
	     -2579.051456 - 5079.051456

	   Model minimum & maximum.
		X:  -3001.000000 to 3714.000000
		Y:  -1350.000000 to 1350.000000
		Z:  0.000000 to	2500.000000

	   Enter spacing (mm) between fired rays.  10

	   grid	spacing:  10.000000

	   Shooting down 1st axis.

	   Shooting down the 2nd axis.

	   Shooting down the 3rd axis.

	   SUMMARY OF FILES USED & CREATED
		.g file	used:  test.veh.g
		regions	used:
		     vehicle
		     air
		file containing	second pass information:  veh.f.2nd
		material file used:  prp
		conductivity file created:  veh.s.con
		  (format is PRISM 3.0)
		conductivity table file	created:  veh.s.tbl
		error file created:  veh.s.err

	   Freeing memory.

CHANGES	SINCE BRL-CAD RELEASE 4.0
       1. Made the numbering scheme for	regions	the same throughout all	irprep
       programs, i.e. region numbers start at one not zero. This affects the
       format of the diagnostic	and error files.

       2. Correct the format of	the conductivity file for PRISM. The larger
       region number must come first.

       3. The user is given a choice of	a 2.0 PRISM format or a	3.0 PRISM
       format.

       4. Some diagnostic information is no longer printed out.

       5. The user is given a choice of	firing one set of rays or three	sets
       of orthogonal rays.

SEE ALSO
       firpass(1), shapefact(1), all_sf(1), showtherm(1), ir-X(1), ir-sgi(1),
       pictx(1), pictsgi(1), User's Manual for IRPREP (BRL-SP-96), Computer
       Programs	for Generating an Input	File for PRISM and Displaying PRISM
       Results (BRL report in progress)

AUTHOR
       Susan A.	Coates

COPYRIGHT
       This software is	Copyright (c) 1991-2013	by the United States
       Government as represented by U.S. Army Research Laboratory.

BUG REPORTS
       Reports of bugs or problems should be submitted via electronic mail to
       <devs@brlcad.org>.

BRL-CAD				  07/08/2017			    SECPASS(1)

NAME | SYNOPSIS | DESCRIPTION | EXAMPLE | CHANGES SINCE BRL-CAD RELEASE 4.0 | SEE ALSO | AUTHOR | COPYRIGHT | BUG REPORTS

Want to link to this manual page? Use this URL:
<https://www.freebsd.org/cgi/man.cgi?query=secpass&sektion=1&manpath=FreeBSD+12.0-RELEASE+and+Ports>

home | help