| 1 |
(* ASCEND modelling environment |
| 2 |
Copyright (C) 1998, 2007 Carnegie Mellon University |
| 3 |
|
| 4 |
This program is free software; you can redistribute it and/or modify |
| 5 |
it under the terms of the GNU General Public License as published by |
| 6 |
the Free Software Foundation; either version 2, or (at your option) |
| 7 |
any later version. |
| 8 |
|
| 9 |
This program is distributed in the hope that it will be useful, |
| 10 |
but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 |
GNU General Public License for more details. |
| 13 |
|
| 14 |
You should have received a copy of the GNU General Public License |
| 15 |
along with this program; if not, write to the Free Software |
| 16 |
Foundation, Inc., 59 Temple Place - Suite 330, |
| 17 |
Boston, MA 02111-1307, USA. |
| 18 |
*) |
| 19 |
(* |
| 20 |
by Arthur W. Westerberg |
| 21 |
THIS FILE IS AUTO-IMPORTED INTO THE ASCEND MANUAL! BE CAREFUL WITH EDITS. |
| 22 |
*) |
| 23 |
REQUIRE "atoms.a4l"; |
| 24 |
|
| 25 |
MODEL vessel; |
| 26 |
NOTES |
| 27 |
'author' SELF {Arthur W. Westerberg} |
| 28 |
'creation date' SELF {May, 1998} |
| 29 |
END NOTES; |
| 30 |
|
| 31 |
(* variables *) |
| 32 |
side_area "the area of the cylindrical side wall of the vessel", |
| 33 |
end_area "the area of the flat ends of the vessel" |
| 34 |
IS_A area; |
| 35 |
|
| 36 |
vessel_vol "the volume contained within the cylindrical vessel", |
| 37 |
wall_vol "the volume of the walls for the vessel" |
| 38 |
IS_A volume; |
| 39 |
|
| 40 |
wall_thickness "the thickness of all of the vessel walls", |
| 41 |
H "the vessel height (of the cylindrical side walls)", |
| 42 |
D "the vessel diameter" |
| 43 |
IS_A distance; |
| 44 |
|
| 45 |
H_to_D_ratio "the ratio of vessel height to diameter" |
| 46 |
IS_A factor; |
| 47 |
|
| 48 |
metal_density "density of the metal from which the vessel |
| 49 |
is constructed" |
| 50 |
IS_A mass_density; |
| 51 |
|
| 52 |
metal_mass "the mass of the metal in the walls of the vessel" |
| 53 |
IS_A mass; |
| 54 |
|
| 55 |
(* equations *) |
| 56 |
FlatEnds: end_area = 1{PI} * D^2 / 4; |
| 57 |
Sides: side_area = 1{PI} * D * H; |
| 58 |
Cylinder: vessel_vol = end_area * H; |
| 59 |
Metal_volume: (side_area + 2 * end_area) * wall_thickness = wall_vol; |
| 60 |
HD_definition: D * H_to_D_ratio = H; |
| 61 |
VesselMass: metal_mass = metal_density * wall_vol; |
| 62 |
|
| 63 |
METHODS |
| 64 |
METHOD specify; |
| 65 |
NOTES |
| 66 |
'purpose' SELF {to fix four variables and make the problem well-posed} |
| 67 |
END NOTES; |
| 68 |
FIX vessel_vol; |
| 69 |
FIX H_to_D_ratio; |
| 70 |
FIX wall_thickness; |
| 71 |
FIX metal_density; |
| 72 |
END specify; |
| 73 |
|
| 74 |
METHOD values; |
| 75 |
NOTES |
| 76 |
'purpose' SELF {to set the values for the fixed variables} |
| 77 |
END NOTES; |
| 78 |
H_to_D_ratio := 2; |
| 79 |
vessel_vol := 250 {ft^3}; |
| 80 |
wall_thickness := 5 {mm}; |
| 81 |
metal_density := 5000 {kg/m^3}; |
| 82 |
END values; |
| 83 |
|
| 84 |
METHOD bound_self; |
| 85 |
END bound_self; |
| 86 |
|
| 87 |
METHOD scale_self; |
| 88 |
END scale_self; |
| 89 |
|
| 90 |
METHOD default_self; |
| 91 |
D := 1 {m}; |
| 92 |
H := 1 {m}; |
| 93 |
H_to_D_ratio := 1; |
| 94 |
vessel_vol := 1 {m^3}; |
| 95 |
wall_thickness := 5 {mm}; |
| 96 |
metal_density := 5000 {kg/m^3}; |
| 97 |
END default_self; |
| 98 |
END vessel; |
| 99 |
|
| 100 |
ADD NOTES IN vessel; |
| 101 |
'description' SELF {This model relates the dimensions of a |
| 102 |
cylindrical vessel -- e.g., diameter, height and wall thickness |
| 103 |
to the volume of metal in the walls. It uses a thin wall |
| 104 |
assumption -- i.e., that the volume of metal is the area of |
| 105 |
the vessel times the wall thickness.} |
| 106 |
'purpose' SELF {to illustrate the insertion of notes into a model} |
| 107 |
END NOTES; |
Parent Directory
| 
Revision Log