参数化建模

cyl_height = 45
cyl_radius = 25
my_config_2.dat
hole_radius = 2
my_config_3.dat
CASE STUDY: PARAMETRIC MODELING

Step 4: Run the session file created earlier


Configuration file

Generate output file containing pertain analysis data

Assign result value to a variable for additional calculation & processing

The goal is to make it possible for the user to use names and default values for variables (parameters) in every entry point on every form that can be accessed for modeling purposes

Assign the configuration file using an environment variable: parametric_modeling_config_file Or assign the configuration file using the following command:

Create the cutter and subtract it from the cylinder
CASE STUDY: PARAMETRIC MODELING

Step 3: Set up the configuration files

Quit Patran Create relevant configuration file(s)


Define a variable name and its default value to be used during the modeling process

Response variables creation mode

Search through and manipulate the results of analysis to define meaningful metrics for export to an external file

Step 1: Define variables

Width = 2 Height = 4 Length = 50 Element_size_length = 2

element size along the beam element size @ cross section

Element_size_section = 1


Permits the use of named variables to replace the usual fixed numerical values of the modeling parameters
The values of these parameters different than the prescribed default can be provided by an external file

Step 3: Create the initial geometry

Create the 4 x 2 x 50 solid Use variables
Model a cylinder with a hole through it Vary the cylinder radius and height
CASE STUDY: PARAMETRIC MODELING

Part dimensions
cyl_radius
hole_radius
cyl_height
1. 2. 3. 4. 5.
Create variables/macros
Assign variables to specific Patran actions Define desired results as output variables Create and assign a configuration file Run the session file containing variable settings and Patran actions Iterate analysis process using data stored in the output file
PARAMETRIC MODELING

A new toolbox implemented as an adaptive form accessed from the main menu bar and called “Parametric Modeling” has been developed Variables definition mode
name = mat1 ! this is a string variable, note no quotes names = one, two, three ! this is a string array, again no quotes

Configuration filenames are case sensitive

Mesh_seed_length


Mesh_seed_width


Mesh_seed_height

Height / Element_size_section
Convert the result into an integer value
CASE STUDY: CANTILEVER BEAM


In the command line In the session file
parametric_modeling_util.define_user_config_file (“my_config_1.dat”)

When the session file is played, Patran looks for the variable definitions contained in the configuration file By creating/editing the configuration file and re-playing the session file, the parametric modeling process is automated The parametric process can be executed in batch

CASE STUDY: CANTILEVER BEAM

Step 2: Define macros

Pressure_loading

1500 / area Area = length * width Length / Element_size_length Convert the result into an integer value Width / Element_size_section Convert the result into an integer value


Structural analysis of a cantilever beam Distributed loads of 1500 lbs Fixed end Vary the beam cross section Height Width
CASE STUDY: CANTILEVER BEAM
PARAMETRIC MODELING
PARAMETRIC MODELING

Provide automated parametric analysis in support of complex design processes Allow users to parametrically investigate and assess a number of different designs via batch submittal of a number of different design studies

These files contains the new variable definitions.
cyl_height = 55 cyl_radius = 15 hole_radius = 2 cyl_height = 50 cyl_radius = 20
பைடு நூலகம்
my_config_1.dat
hole_radius = 2
PARAMETRIC MODELING SCENARIOS

Using variables and configurations Marco definitions and usage Output definitions
CASE STUDY: PARAMETRIC MODELING

6.
PARAMETRIC MODELING

Configuration file format

The configuration file is used to reset existing Parametric Modeling variables to new values The format of the configuration file is: name = value ! comment Here are some examples.



Patran –spf <session file name> -b
CASE STUDY: PARAMETRIC MODELING

Step 4: Run the session file created earlier
Vary the cylinder height
Vary the cylinder height & radius
PARAMETRIC MODELING SCENARIOS

Using variables and configurations Marco definitions and usage Output definitions
CASE STUDY: DESIGN EXPLORATION CANTILEVER BEAM

cyl_height = 60 cyl_radius = 10
hole_radius = 2
CASE STUDY: PARAMETRIC MODELING

Step 2: Create a cylinder using the variables
CASE STUDY: PARAMETRIC MODELING
3 * cyl_radius
cyl_height / 2
6 * cyl_radius
CASE STUDY: PARAMETRIC MODELING

Step 1: Define variables
CASE STUDY: PARAMETRIC MODELING

Step 1: Define variables

maximum = 1000 ! this is an integer
three = 1, 2, 3 ! this is a 3 word integer array data = 37.655 ! this is a real
moredata = 1.0, 2.0, 3.0, 4.0 ! this is a 4 word real array
PARAMETRIC MODELING

Variable creation
PARAMETRIC MODELING

Macro creation
PARAMETRIC MODELING

Responsive variable creation
PARAMETRIC MODELING

Steps in parametric modeling