P19432: Murphy's Stage
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Build & Test Prep

Table of Contents

Team Vision for Build & Test Prep Phase

What we planned to do:

What did we actually do:

Project Plan

 Preliminary Gantt Chart for all of MSD II

Preliminary Gantt Chart for all of MSD II

A link to the live Gantt chart document can be viewed here

Test Plan Summary

Example of Test Plan

Example of Test Plan

The test plans encompassed both our engineering requirements and additional testing to ensure the stage functions beyond the given requirements. These included:

The full slate of tests can be viewed in the spreadsheet linked below. View live test plan here.

Analysis

Analysis was formally derived for to ensure the concrete bolts will not pull through the concrete.

Assumptions:

Below is a diagram depicting the free body diagram of the structure anchored into the concrete.

 Concrete anchor structure diagram

Concrete anchor structure diagram

The equations below show the process of determining the force associated with the loading condition induced by the gas springs. Where:

 Concrete anchor equations

Concrete anchor equations

The factor of safety is 3.42 which is safe for our application.

Concentrated Load Analysis

The stage should withstand a load of 150 lbf over the entire surface. Please see "Detailed Design" phase for this analysis.

A concentrated load on a flooring surface according to the 2018 International Building Code is the maximum load that surface should be expected to withstand if the load is evenly distributed over a 2.5' x 2.5' area. This analysis was performed using ANSYS Classic and the results and inputs can be seen in the table below.

 Concentrated Load Analysis

Concentrated Load Analysis

The yield strength of aluminum is 37,000 psi and the Inverse Tsai-Wu criterion estimates the inverse of the safety factor for the sandwich structure.

Below are the results of the inverse Tsai-Wu failure criterion as well as stage deflection. At 1500 pounds, the stage deflects 0.118 inches.

 Concentrated Load Deflection Results

Concentrated Load Deflection Results

 Concentrated Load Sandwich Failure Criterion

Concentrated Load Sandwich Failure Criterion

 Concentrated Load Stage Deflection at 1500 pounds over Worst Case Area

Concentrated Load Stage Deflection at 1500 pounds over Worst Case Area

Risk and Problem Tracking

 Updated Risk Management as of 1/23/19

Updated Risk Management as of 1/23/19

Problem Tracking

A live problem tracking document was created to aid the team in the management of problems that arise during MSDII. Each problem goes through 6 stages:

  1. Identifying and selecting problem
  2. Analyzing problem
  3. Generating potential solutions
  4. Selecting and planning solution
  5. Implementing solution
  6. Evaluating solution

As problems come up they are added to the list and evaluated as the team moves through the problem stages. This helps the team to stay organized and recognize which problems have been addressed and which ones need to be addressed.

View live problem tracking here.

View live risk management here.

Design Review Materials

Plans for next phase

Individual 3 week plans:

Jason Schulz

Vincent D'Arrigo

Eric Szyjka

Kevin Leonard


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