Review for Final

Final Exam Schedule:
http://www.lonestar.edu/examschedule.htm

Our final is on Saturday Dec 12th, during regular class time from 10:00-1:00.  

The final exam will consist of two parts:
An in-class written exam with concept questions, and a take-home portion of creating an assembly.  Let me know if you have any questions over anything!

Part 1: Written questions:
1. Concept questions from architectural engineering /bridge project
see notes here:
http://en1304.blogspot.com/2015/10/fea-bridges.html

Stress analysis:
    What types of loads might a typical bridge encounter? 
    What is FEA - Finite Element Analysis?

Materials selection 
  Given a stress strain diagram, what is considered a safe loading area?
  List material properties that influence design.

http://en1304.blogspot.com/2015/12/mechanics-of-materials.html




2. Concept questions over an internal combustion engine:

 - what are the 4 strokes for an internal combustion engine?  
- Draw a PV diagram, and label each of the 4 strokes on it.
 - Name the main parts of an engine (crank, Cam, connecting rod, piston, etc.)
 - Name sources of energy loss, and discuss energy efficiency issues.

http://en1304.blogspot.com/2015/11/internal-combustion-engines.html




Part 2: CAD / Inventor Assembly 
Make a complete set of working drawings for a simple assembly (2-3 parts) in either Inventor or AutoCAD.  Your set of working drawings should have:

a) An exploded assembly drawing with a parts list, balloons with leader lines.

b) Individual parts with dimensions and tolerances labeled.

c) one sectional view


Working drawing examples - see chapter 9:


Make a pen or pencil

Practice #2:  Tape Dispenser

Other project ideas:

Make a Star Wars toy:

pull-apart / make your own / droid / tie fighter / lightsaber

Desk organizer

Chess set, dice set, or other game

3D puzzle:

nightlight!

Pick something fun, and let me know if you would like to use the 3D printer!

Hope you have had a fun semester, hope to see you around next semester too!

Dynamic FEA

From your dynamic simulation, right click on a part that you would like to do a FEA analysis of.

Right click → open

Once your part is open in a new window, go to environments →stress analysis→create simulation →  static analysis & assign material properties.



return to your assembly → Export to FEA

select the part you want a FEA of, "OK"

Click on the "!" parts, and select the surface the constraints are on to get rid of all the !'s.


Open your output grapher, and start a simulation (Simulation player)

After the sim has run, open up everything in the output grapher:

Export to FEA → right click on time steps → generate time steps

These are the times that your force data will be sent to FEA.

Open up your relative joints, make sure some times are being exported to FEA.

You should now be able to see all of your time steps:

Run the simulation, then Finish Dynamic Simulation.

Environment → Stress Analysis →Create simulation → Motion Loads analysis

Click on your time steps, see the times you exported data for.

click on one of your time steps  → OK

The model will move to the position it was in at the selected time step & apply corresponding loads.

Simulate → run

Look through your simulation results!

1304 Semester Project

12-2 Finish up semester project & get engine checked off.

12-4 Project presentation & Review for the final
Final exam schedule: http://www.lonestar.edu/examschedule.htm

ENGR1304 Final Thurs, Dec 11th from 9:30-11:20

Review “Writing as an Engineer”
http://engr1304.blogspot.com/2014/01/writing-as-engineer.html





Project write-up:

Heading:
Centered on page: Name of your product (pick a catchy name!)
Your name, with date, and" LSC ENGR Project".




The No Totter Water Potter
Jack & Jill, 2014 Spring LSC ENGR Project

1. Introduction (5 points)Briefly state the product you decided to design, what need it will fill, who it will be marketed to, and why you chose this product.

ie – Jack and Jill have refused to go up the hill, so we created a clean drinking water  transportation and containment system to deliver and store fresh hill spring water right inside their own house.

2. Research and Background information (10 points) 
As can be seen on the map in figure 2.1, on top of High Hill at the headwaters of Slippery Stream lies Clearwater Spring.   The spring water is purified through a natural filtration process where the groundwater seeps through rocks and soil (see ref #1).  Etc. etc.  This water was last tested on Nov 28, 2012 by AAAEnviroWet and was found to be exceptionally pure (ref #2).
.

3. Product specifications, diagrams, pictures, and user instructions. (45 points)

Include a complete set of working drawings with parts tables and dimensions.  Explain the functionality of each part, assembly, and the best materials to make it out of.

Older lead pipes on the High Hill property will need to be removed, and replaced with insulated polyvinyl chloride piping installed according to rhyme building code specifications (2).   A splitter valve will divide the water flow into an above ground black solar hot water pot, and an underground cold water pot where it is stored until needed as shown in figure 3.1.  etc....

4. Modifications, testing, and operation procedures.   (25 points)
Include FEA, and dynamic simulation results.

Water purity, pressure, and temperatures were tested throughout the system at various weather conditions as shown in table 4.1.  After consideration of the data, a pressure relief valve was installed to prevent rupture of the solar heater during hot summer months, and an air injection line was installed to blow water out of lines susceptible to freeze in the winter.   Operating procedures for both summer, and winter months are presented below….
..

6. Conclusions, suggestions for future work. (10 points)
Jack and Jill’s new “No Totter Water Potter” network is vast improvement over the previous bucket and muddy path water transportation  system.  Although this new system has many advantages, the spring snowmelt water runoff poses a possible threat to the water purity in late April and May, and future mitigation for this is strongly suggested.  Etc.

Reference Section (5 points)

Correctly formatted, and numbered.

Use the writing tutoring center!
http://engr1304.blogspot.com/2014/03/tutor-schedule.html

Presentation:
Short, sweet, simple, entertaining.


Total presentation should be no longer than 10 minutes.  Bring a USB drive with diagrams, slides, videos of your diagram, etc. to share.  Presentations will be graded by your class peers on enthusiasm, clarity, organization, body language, voice projection, and visual aids.

  

Presenter __________________       Grader _______________________

PRESENCE                                                                               5          4          3          2          1          0

      -body language & eye contact

      -poise
-enthusiasm

LANGUAGE SKILLS                                                             5          4          3          2          1          0

      -correct usage

      -appropriate vocabulary and grammar

      -understandable (rhythm, intonation, accent)

      -spoken loud enough to hear easily

ORGANIZATION                                                                    5          4          3          2          1          0

      -clear objectives

      -logical structure

      -signposting ( the way they explain the path that was taken)

MASTERY OF THE SUBJECT                                             5          4          3          2          1          0

      -pertinence

      -depth of commentary

      -spoken, not read

      -able to answer questions

VISUAL AIDS                                                                          5          4          3          2          1          0

      - Clear and understandable

      - Demonstrates proficiency in CAD

     

OVERALL IMPRESSION                                                      5          4          3          2          1          0

      -very interesting / very boring

      -pleasant / unpleasant to listen to

      -very good / poor communication

                                                                                                     TOTAL SCORE  _______ / 30

List Strengths:

List at least one area for improvement:

If you are having trouble with your engine dynamic simulation, try something simpler first - below is an example from last year.  If you cannot get your engine dynamic simulation to work, at least get a simple system to work! 

Create a simple double pendulum assembly, or any other gravity driven system that you want (if there is something to create for your semester project, you can make that - just create a dynamic simulation of something). Constrain it to move correctly, assign materials to each part like before.

Tools →Material

then go to
Environments → Dynamic Simulation

Simulation player → Construction mode  
Upper left hand icon in simulation player - you have to be in construction mode in order to edit anything.

Assign gravity to act down:(Just right click on the gravity apple in the left hand menu)



Note: Your simulation settings should be set to automatically convert constraints to standard joints:



Look for the joints that were created from your constraints:

Test out your dynamic motion:



Adjust parts as needed (I changed the frame size for increased motion)



Once you have the dynamic motion all set, go ahead and run your simulation.

Click the "Construction Mode" button on the upper left hand corner of your simulation to go back and edit joints, forces, etc. to get the motion working correctly.

Click on "Output Grapher" then right click and add a tracer:

Collect output for Traj, Vel, Acc, change the tracer color to something that shows up (like yellow) and click on a point to trace (like the end of the pendulum)

Run the simulation with your tracer on, open up the graphs (+), check what you want to see.

Adding constraints:
Right now, my pendulum can go through the bar that is holding it up.  Let's add a constraint to fix this:




Hit the construction button on your simulation player, then select "Insert Joint:

You can click on any of the constraints, and see an animation of what type of constrain it is - have a look around at all the different constraints, then choose 3D contact.

Select component 1:

Select component 2:

 Run the simulation with the pendulum starting in a high position:

 Notice that now your pendulum will bounce off of, rather than travel through, the bar that is holding it up.

Play around with it!  Look at the velocity and acceleration graphs, or create some new systems to play with!


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