Individual Robot Analysis (10% of overall course grade)


Turn-in Logistics

  1. Include your name, team number, and section number on the cover of report
  2. Attach your original project proposal (with TA comments) to the back of the final robot report
  3. Turn in stapled hardcopy as descried below for detail grading.
  4. Turn in electronic copy for proof-of-submission as described below.

Due Date

Due Date For Tu & Wed Sections:

  • Friday last day of classes at 8:00pm
  • Turn hardcopy into bins in Design Studio by the sink
  • Submit electronic copy also by 8pm
      1. TED.ucsd.edu ( log in with your student credentials)
      2. MAE 3 - Delson  (select MAE3 from your list of classes)
      3. Assignments  ( this is located on the left hand side menu)
      4. View/Complete ( Click the link for the assignment and upload your report)
Due Date For Th & Fr Sections:
  • Saturday, one day after last day of classes at 8pm
  • Turn hardcopy into large plastic bin in EBU2-239
  • Submit electronic copy also by 8:00pm
      1. TED.ucsd.edu ( log in with your student credentials)
      2. MAE 3 - Delson  (select MAE3 from your list of classes)
      3. Assignments  ( this is located on the left hand side menu)
      4. View/Complete ( Click the link for the assignment and upload your report)

Tips for Navigating the Ted Site


Assignment

Each individual team member should analyze a key component of the machine that they built. The component being analyzed should:

  • Be a moving part (see instructor is you want to analyze a stationary part
  • Have an impact on overall machine performance
  • Have a performance characteristic that can be measured such as speed, force, or torque.
  • Each team member should analyze a different aspect of machine performance. If necessary two members can analyze the same component but different aspects of that component, such as force generated vs. speed of operation.

A team member CAN analyze a piece of hardware that was built but was not incorporated in the final robot design; as long as the component functions to the point where one can compare theoretical predictions and part performance (or failure to perform). If you spent a lot of time working on part of the machine that did not pan out, still consider using it for your analysis.

Grading Guidelines

The individual analysis will be grade will be grades on clarity of text and graphical content as well as correctness of analysis. It is recommended that reports be printed in color and presented professionally.  The analysis section will consider the complexity of the analysis. If a relatively simple part of a machine is being analyzed, then a high grade will require more in-depth analysis, such as: consideration of friction and the motor torque-speed curve. I will be looking for a critical assessment of machine performance and a meaningful explanation of experimental results and how they may vary from theoretical expectation.



Part I: Description of Component (2 page max) (25%)

In this section you should introduce your entire robot's design, what it does, and introduce the component you intend to analyze. It should be be clear to a naive reader how your robot works. This section should include:

  • 3D CAD of complete machine with annotations. It should be clear how overall machine works.
  • 3D CAD of component with annotations. You should show how details of component work. Include multiple views if it helps
  • Minimum Set of Functional Requirements of your component
    • What the component needs to accomplish (not how it was accomplished)
    • List each FR as a one sentence bullet. Indicate quantitative values where appropriate
    • Example: "Robot must reach middle of table in 10 seconds."
  • Overview of how well component functioned. Give numerical values (e.g. speed, points, maximum mass lifted, etc...)

Part II: Project Management Essay (1 page MAX) (15%)

Select ONLY ONE area of project management listed below, and explain how this approach was used by you in the design process. This essay is not related to your analysis. Describe what aspects of this design process worked well or didn't work well, and what would you change in future design projects.

  • Concept generation and creativity methods. Give an example where you had a conceptual block, conceptual breakthrough, or where you used a solution neutral environment. See lecture on Creativity.
  • Risk reduction tests. Describe a case where you built a simple proof of concept mechanism in order to decide whether to proceed with that approach. The results of the test could have led you to pursue or abandon your approach
  • Prioritization and scheduling.Explain why you prioritized certain tasks and how this impacted your overall design process. For example did you follow your Gantt chart, and did the chart help the design process.

Part III: Analysis of Component (2-3 pages) (60%)

Objective of Analysis:
What aspect of machine performance are you trying to calculate? What design decisions can you make based upon your analysis?

Free Body Diagram (FBD):
  • The FBD must be digitally generated.
  • Recommended approach:
    • Create an Inventor drawing of your robot with the proper view for the FBD
    • Save the drawing as a image file
    • Crop and add the force vectors and lengths in powerpoint
  • Create a table or list which shows all the physical parameters (actual numbers) used in the FBD and analysis
Force/Torque Analysis:
Assumptions:
List the assumptions of force torque analysis
    • You should describe your assumptions in less than one sentence
    • Indicate if the assumptions is conservative or optimistic
    • Example: Point-mass Assumption: masses are concentrated at points as shown in the FBD above (optimistic).
Calculate the maximum force or torque:
Describe step by step how you calculate the maximum force or torque generated by your component
    • Use an equation editor:  
      • Microsoft word equation editor recommended
    • variables should be kept until the final equation
    • give numerical results at the very end
    • In addition to the maximum force, calculate the force required
Measure the maximum performance of the robot:
    • Describe the experiment you conducted
    • use spring scales, masses, etc..
    • Estimate and comment on the accuracy of your experiment.
Conclusions:
    • Calculate Factor of Safety (F.S.) in Force or Torque
      • F.S. Force = Force available / Force required
    • Calculate the percentage error between the measured and theoretical maximum performance
Speed Analysis Using Power:
Assumptions:
list the assumptions of your speed analysis
    • You should describe your assumptions in less than one sentence
    • Indicate if the assumptions is conservative or optimistic
    • Example: No Friction: no energy losses due to friction (optimistic).
Calculate the maximum speed of your robot:
Describe step by step how to calculate the maximum speed of the robot by using energy and power. Use the maximum power output of your component to calculate the fastest theoretical time your component could complete it's task.
    • Use an equation editor:  
      • Microsoft word equation editor recommended
    • variables should be kept until the final equation
    • give numerical results at the very end
    • Motion analysis of video can use Motion Analysis Software: http://physlets.org/tracker/ that is installed in the computer labs.
Conclusions:
Compare the theoretical fastest time to the measured time of your component. Discuss why there is a discrepancy. (hint: the theoretical fastest time will be much faster than your measured time).

Conclusions
In this section, you will make general conclusions about your component, as well as the robot project as a whole
  • briefly summarize the results of your analysis
  • What did you learn from the analysis?
  • Explain what you would do next time if you were to repeat the competition
  • Conclude general and thoughts ideas for the robot.


Specific Guidelines and FAQ

  • For MAE3 analysis, dynamics can often be neglected and quasi-static analysis performed.
  • However, areas covered in MAE3, such as friction and jamming in linear bearings should not be neglected.
  • Do not write out more significant digits than one has reasonable accuracy for.
  • When describing assumptions indicate if the assumptions is conservative or optimistic. With a conservative assumption actual machine performance will be higher than predicted (the other way around for optimistic assumptions).
  • There will always be differences between predicted performance and measured performance. The key is to get as close as possible with the analytical and measurement tools we have, and then make hypotheses to help explain actual machine performance.
  • In MAE3 it can happen that one builds the machine without extensive use of analysis; instead relying on trial and error. In such cases the analysis is performed afterwards for the report. However, with real-world projects, typically trail and error is very expensive, sot he analysis must be done before one builds. For the MAE3 analysis report, assume that you are doing the analysis before the device is built, and your objective is to determine if indeed the device will perform as required, and to predict performance speed and or force/torque.

 

References

Example Analyses

 

 

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Daniel Yang,
May 18, 2016, 1:00 PM
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Daniel Yang,
May 18, 2016, 1:00 PM
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Michael Tolley,
Sep 21, 2015, 6:06 AM
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Nate Delson,
May 24, 2016, 11:09 AM
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