1. WORKSHOP 19 HATCHBACK III

3. Workshop Objectives Software Version Files Required
Use Adams/Solver to simulate the given Mazda MX-6 hatchback model.
Software Version
Adams 2013
Files Required
Saved file from Workshop 18 or Hatchback_2_completed.cmd
located in exercise_dir/mod_18_hatchback_2/completed

4. Problem Description
In this workshop you will use the model saved in Workshop 18. Recall the parts of this model are constrained as follows:

5. Suggested Steps Import file and export a database file.
Create a command file.
For windows open a command window.
For UNIX open a UNIX shell.
Perform the simulation.
Modify the spring stiffness in the dataset (.adm) file
Modify the Adams/Solver command file (.acf).
Perform a simulation and import results.
Check that both analyses are children of the model.
Scale the curves by a moment arm (1/700).
Investigate the new curves.
Optional tasks

6. Step 1. Import File and Export a Dataset file
To import file:
Start Adams/View, and set the directory to exercise_dir/mod_19_hatchback_3.
From the directory exercise_dir/mod_18_hatchback_2, import the model that you created in the previous section.
If you need a fresh copy of the model, import the command file, hatchback_2_completed.cmd, from the directory exercise_dir/mod_18_hatchback_2/completed. d e
To export a dataset (.adm) file:
From the File menu, select Export.
Enter the following, and select OK:
File Type: Adams/Solver Dataset
File Name: hatchback.adm
Adams/view exports this file to your current working directory, exercise_dir/mod_19_hatchback_3. f

7. Step 2. Create a Command File
To create a command file (.acf):
Open a text editor (unix: vi or Jot; Windows: Notepad or WordPad)
Create an Adams/Solver command file (.acf) that contains the following commands:
hatchback.adm (.adm extension optional)
hatchback_test1
OUTPUT/NOSEPARATOR
DEACTIVATE/MOTION, id=1
SIMULATE/DYNAMIC, END=4, STEPS=40
ACTIVATE/MOTION, id=1
SIMULATE/KINEMATIC, END=7, STEPS=30
STOP
Save the file as hatchback.acf in your current working directory, exercise_dir/mod_19_hatchback_3 b c

8. Step 3. For Windows Open a Command Window
If you are running on UNIX, skip to step 4, page WS19-9. For windows:
From the Start menu, point to All Programs >MSC.Software>Adams x >Adams - Command Prompt
Change directories to your working directory, exercise_dir/mod_19_hatchback_3
Use table 1 as a reference for the commands.
Leave the window open because you will be running Adams/Solver from this window.
Skip to step 5, go to page WS19-10. b d

9. Step 4. For Unix Open a UNIX Shell
Change the directories to your working directory, exercise_dir/mod_19_hatchback_3
Use Table 2 as a reference for the UNIX Commands
Leave the shell open because you will be running Adams/Solver from this shell. c

10. Step 5. Perform the Simulation
To perform a simulation in stand-alone Adams/Solver using the command file you just created (hatchback.acf), for Windows use the following commands:
To display the Adams Program menu use:
adams<version #> - for the MSC version of Adams
Note: for a 64-bit machines append the command with _x64
ru-s - runs Adams/Solver with standard Adams executable
Hatchback.acf - identifies the .acf Adams/Solver file and runs the simulation
Exit - exits Adams/Solver
Leave the window open because you will be using it again soon.
To perform a simulation in stand-alone Adams/Solver using the command file you just created (hatchback.acf), for UNIX use the following commands:
adamsxx –c - to display the Adams program menu. (where xx is the version number, for example adams2013 –c )
ru-s - runs Adams/Solver with standard Adams executable
Note: As common practice, you should open the message file (.msg) and search for errors and warnings. Correct the model or the .acf file to eliminate the errors and warnings. a b c c

11. Step 6. Modify the Spring Stiffness in the Dataset (.adm) File
To modify the spring stiffness in the dataset (.adm) file:
In a text editor, open hatchback.adm, this file is located in the directory exercise_dir/mod_19_hatchback_3.
Do a search for forces.
Modify the value of both the springs stiffness from to N/mm
Save the file as hatchback2.adm in the same directory. b a c d

12. Step 7. Modify the Adams/Solver Command File
To modify the Adam/Solver command file (.acf) to run with hatchback2.adm:
In the text editor, open hatchback.acf from the directory exercise_dir/mod_19_hatchback_3.
Modify the first and second lines of the .acf file so they are:
Hatchback2
Hatchback_test2
Save the file as hatchback2.acf. a b c

13. Step 8. Perform a Simulation and Import Resultsb
To perform a simulation:
Using the new command file, (hatchback2.acf) perform a stand alone Adams/Solver simulation. Similar to how it was done previously on page WS19-10.
To import the results for both simulations:
In Adams/View, from the File menu, select Import.
For the File Type, select Adams/Solver Analysis (*.req, *.gra, *.res)
For the Files to Read select hatchback_test1.res.
For the Model Name enter hatchback
Click OK to import the results for hatchback_test1.
To import the results for hatchback_test2, repeat steps b through f, except change the File to Read to hatchback_test2.res. d e f c

14. Step 9. Check that Both Analyses Are Children of the Model
To check that both analyses are children of the model:
Use Tools>Database Navigator
In the Database Navigator, change the Filter type from modeling to Analyses.
Double click the + sign of the hatchback model.
Check to make sure that both hatchback_test1 and hatchback_test2 are children of the model. a b c d

15. Step 10. Scale the Curves by a moment arm (1/700)f h i e g c j d
To scale the curves by a moment arm (1/700):
Activate the measure closing_torque_measure. Tip: change the filter type to measure
Launch Adams/PostProcessor.
From the Simulation list, select the two analyses, hatchback_test1 and hatchback_test2.
From the measure list, select closing_torque_measure.
Click Add Curves.
Click the Curve Edit Toolbar Icon. a
From the new toolbar, select the Scale a Curve tool.
To individually scale both curves by the moment arm (1/700) enter 1/700 in the scale textbox
Select both curves 1 and 2.
The new curves should show up in the legend.

16. Step 11. Investigate the New Curves
To investigate the new curves:
Use Edit>Delete to delete the original curves.
Use the Subtract one curve from another tool to find the approximate differences between the maximum force values. Use this value to answer Question 2 in the Workshop 19, Review section, page WS19-18
Save your model. If you want to further explore the model in the optional tasks, then leave the model open. Otherwise Exit Adams/View. b a

17. Step 12. Optional Tasks To Simulate the Model in Adams/Solver:
Simulate interactively but without a script (no .acf file).
From a DOS prompt, enter the following commands, where xx is the current version of Adams:
adamsxx<CR>
ru-standard<CR>
<CR> (Because you do not have an Adams/Solver command file (.acf), press the enter key).
Adams/Solver should start.
At the Adams command prompt, enter commands one at a time in the same order in which they appear in the .acf file.
After entering all the commands, exit Adams/Solver and import your results into Adams/View so you can inspect them using animations and plotting.
To launch Adams 2013 from Windows command prompt, set an environment variable as follows:
Search the PATH environment variable under system variable/user variable.
Edit its value as follows : Variable Name: PATH Variable Value : X:\MSC.Software\Adams_x64\2013\bin *where X is location drive on which Adams is installed.
If this environment variable is not available, create the same as mentioned in step b.
Open Command prompt window, and run command Adams2013_x64 from your working Directory.

18. Workshop 19, Review Workshop Questions
What is the difference between a statement and a command? ______________________________________________________________________________________________________________
What is the maximum force difference between the two tests (hatchback_test1 and hatchback_test2) you performed? ______________________________________________________________________________________________________________