In Person Show and Tell 


We had a few tours of our cart and cubicle during this phase.  Our first tour was a bit unexpected, but we were happy to help.  Dr. DeBartolo and a few others were walking around the MSD floor during one of our meetings and asked us to walk the group through our project and what we were currently working on.  We explained the idea behind our project and gave a brief demonstration of how our design unfolds and reacts.


Our other tour was with our customer, Marcos Esterman.  We took the cart outside and fully assembled it.  We showed the functionality of the cart and explained our methodologies.  We then talked to him about the concerns with the cart that we had going forward for future teams.  We documented these things and talked over his vision for the coming years for the cart and its design.  

Team Vision for Final Demo and Handoff

Summarize:

  • We planned to continue making progress on the education power generation kit, prepare our lightning talk and other final deliverables, and to have our documentation in a state that will allow for our customer to use it, for someone to be able to replicate our work, and for a future MSD team to be able to build off of it.
  • We finished all of our final deliverables and documentation but did not get as far as we would have liked on the power generation kit.

Design Changes

Quick Release Handle

In the last review, the desire for a better way to store the handle was expressed. During this phase, we replaced one of the screws at the base of the handle with a quick release pin to allow for the handle to be quickly taken off and stored out of the way in an easier fashion.

Overall Changes to Design

Throughout MSD II, we have continuously made changes to the cart to make sure that it is the best form of itself by the end of the semester. The end result looks a lot like the original design but has many small adjustments to optimize its performance

Educational power generation kit with magnets and inductors

When taking a look at the micro wind turbine idea previously mentioned in earlier phases, we found that, at the base of the construction revolved around a magnetic field moving through a coil of wire which would provide a measurable voltage.  As seen above is an example of electricity being generated using the principles of magnetism and motion. The cylinder represent a copper wire and the red x's represent the magnetic field directed into the screen. When the copper wire moves through this field, the electrons sitting inside the copper wire will have a downwards force acting upon them. The wire, the magnetic field and the speed of the motion are all factors that determine the flow of the electrons and the net charge measured. in our case, instead of having the wire moving though the magnetic field, we have the wire coiled in a static position, and a moving magnet, which produces the same effect with the moving magnetic field as the source of motion. 

In the lab we configured an arrangement very similar to the above picture. A powerful magnet was used in conjunction with small 30-gauge wire wrapped around a piece of PVC pipe a few hundred turns.  A bridge rectifier was used to change the generated AC current to that of a DC current. the energy we generated was fed into a capacitor which accumulated charge as the magnet was shook inside the tubing. Once the capacitor was at a high enough charge, it could be discharged by lighting an LED. As the capacitor drained, the LED became increasingly dimmer and the discharge was very visible. For future teams and students alike, this setup can be experimented and tinkered with to find the optimal energy generating solution. More turns could be added to the coil of wire, or a different magnet could be used, or a new apparatus could be constructed with the use of 3-D printing that allowed for a faster, more rapid buildup of energy. In this way, a design challenge can be created by students, which would provide a valuable learning experience.


Risk and Problem Tracking

Risk Management

This phase we removed problems 1, 2, 8, 11, 18, 22, 24, 28, and 30 due to the risks remaining at a zero after this phase. For risk 8, the likelihood that we wont have enough funding was changed from a 1 to a 0 due to us finishing the semester with a positive balance. For risk 10, the likelihood that previously purchased equipment does not function properly was changed to a zero due to the project being completed. For risk 16, the likelihood that the electronics will not have adequate cooling was changed from a 2 to a 1 due to information gathered through testing the system more. For risk 21, the likelihood that all components fit into the cart was changed from a 1 to a 0 due to us finishing testing and verifying this fact. For risk 25, the likelihood that we were not able to use a modular design due to wiring was changed from a 1 to a 0 due to us finishing the project and verifying we could. For risk 27, the likelihood that project plans due not communicate together was changed from a 1 to a 0 due to us verifying all electronics worked properly. For risk 29, the likelihood of the hinge system being inadequate was changed from a 1 to a 0 due to us verifying through more testing that it works. For risk 31, the severity of the cart not effectively educating the user was changed from a 2 to a 1 due to the cart having a lot of teaching opportunities, just not extensively stated or tested. For risk 32, the likelihood of the wobble of the scissor system deforming the scissor arms was changed from a 1 to a 0.5 due to the added constraints  that reduce the wobble. Here is the final risk management document.

Problem Tracking

  • We created a document that addresses a lot of the problems that we solved or made progress on over the course of MSD
  • Some of the issues were beyond our scope but we left notes for potential future teams with our thoughts on the issues
  • The problems the document addresses are:
    • Scissor module wobble
    • Handle storage
    • Workspace support
    • Wheel swivel locking
    • Redesign for manufacturing
    • Latches
    • Solar panel support
    • Cart beautification
    • Verifying model based development
    • Packaging for transportation
    • Setup and testing in Colombia
    • Educational power kit with magnets and inductors
    • Storage of electrical components
    • Power combination
    • More interactive UI
    • Technical stenciling on the electrical box and cart
  • The full document addressing the problems:

Final Project Documentation

Final Fabrication and Assembly Drawings

The final revisions of the manufacturing drawings are available here. Previous revisions are available in a folder within the page.

The final revisions of the electrical KiCad drawings can be found here.

Final Program can be found here.

Final BOM

Mechanical


Electrical 

Final Budget

Final Documentation

Technical Paper

The paper was submitted for peer review and modifications made. A paragraph was added for budget and an abstract to the title page. Headers were also added for different sections. These changes can be seen in the technical paper. An example of the changes can be seen below:

Technical Poster

The poster was submitted for peer review and modifications made. The logos were swapped, system testing table updates, and QR scanning codes added. These changes can be seen more clearly in the technical paper. 

Performance vs Requirements 

This document was created this phase. The results from the modular replaceable parts, assembly from transport, and assembly from luggage tests were added to performance vs. requirements, along with the testing results from last phase. The system passed all tests with the cart being assembled from transportation in 5 minutes, assembled from luggage in 10 minutes, and parts being replaced in 10 minutes. The table can also be seen below:

User Manual

A user manual was created with sections including safety, setup, operation, tear-down, and troubleshooting. An example can be seen below:

The sections are as follows:

Safety - This section is an over-arching safety guide for the cart.  It dives into everything from sharp corners to electrical wiring safety.

Setup Instructions - This section gives exact setup instructions for the cart from a module state.  Following the exact instructions will ensure an easy and painless setup.  Helpful pictures are provided for instructions that are hard to explain.

Operations Instructions - This section goes over how to charge the battery, connecting the electrical box to the grid, and how to read/control the rest of the electrical box components.  

Teardown Instructions - This section gives exact breakdown instructions for the cart from a fully assembled state.  Following the steps exactly is very important and pictures are provided for hard to explain storage methods.  

Troubleshooting -  This section deals with some common electrical module issues and how to mitigate them.  


Functional Demo Materials

Include links to:

  • Pre-read
  • Presentation and/or handouts
  • Notes from review
  • Action Items

Plans for Wrap-up

  • Aucune étiquette