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Clock Report Information

MAE3 Clock Report

 

Each student should turn in a hardcopy written report (not a webpage report as in prior years). The report will be graded on the correctness of the analysis as well as the clarity and quality of the writing. Engineering reports are critical components of a design project and should:

  • Clearly and concisely summarize the main findings of the project.

  • Provide the background, objective, and relevance of the work.

  • Provide the engineering details so that another engineer can follow the analysis performed and verify the results. These engineering details should include the methods and assumptions used, as well as all numerical values used and discussion of results.

 

The clock report should include:

  • Cover page with name, section, and clock photo (use Photo Booth in Design Studio).

  • Executive Summary (approximately half a page): Brief description of project and objective of analysis. Include summary of results of timing analysis and percentage accuracy of both calculation methods. A non-technical reader of the summary should be able to understand what you did and the results.

  • Timing analysis:

The timing analysis should be done using an Excel spreadsheet. The Excel Tutorial includes a downloadable template to get the clock analysis started with and explains how to use named cells. The clock report should include 2 print outs of each Excel sheet:

  • 1 printout showing numerical results
  • 1 printout showing the equations with named variables (use ctrl ~)

One purpose of the report is to develop good practices for engineering documentation and analysis. Good practices allows others to easily verify your work (even the lead designer on a project has someone else check their analysis and signoff as reviewer). Good practices in analysis and documentation allow one to avoid errors, and include: 

Clear Documentation

Multiple Methods of Analysis

Intermediate Verification

In the clock timing analysis, two theoretical methods will be used. The first method approximates the mass of the pendulum as occurring at a single point, and a more accurate method treats the pendulum as a rigid body with a moment of inertia along with its mass.

In this analysis it is not necessary to show the free body diagrams or derive the clock timing equations, since they are shown on the instructional webpage (these webpages should be referenced in the report). However, in the robot report at the end of the quarter, free body diagrams and derivations are expected.

 

The analysis writeup for both methods of calculation should include:

    1. CAD figure of pendulum (cut and paste CAD figures)

    2. Area and moment values from CAD region analysis of pendulum

    3. Predicted weight and centroid of pendulum

    4. Comparison to actual weight and centroid

    5. Discussion of any discrepancy between actual and calculated values

    6. Natural Frequency Analysis: state assumptions used and reference source of equations (i.e. timing analysis webpage)

    7. Comparison of actual natural frequency and measured natural frequency

    8. Discussion of results and propose reasons for any discrepancies (optional: how could you verify your hypotheses for these discrepancies)

Discussion of results:

Without discussion of intermediate and final results the value of your analysis is not clear. Comparisons between experimental results and theoretical predictions should be made, and reasons proposed for differences.
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