P19011: Wheelchair Accessible Restroom

Detailed Design

Table of Contents

Team Vision for Detailed Design Phase

The team planned to finalize the BOM, build and test the cylinder design, put material on order, plan schedule for MSD II, complete the gate review and ensure all MSD I deliverables were met, and finalize all material and design decisions.

The team accomplished the following:

Progress Report

Link to Progress Report can be found here

Drawings, Schematics, Prototyping, Simulations

Industrial Design Models

Below is a rendering of the structure of the device design and how the subsystems fit together. public/Photo Gallery/WAR3Assem1Pic.JPG

Below is a rendering of the aesthetics of the device, including the pump covers and handles/seat integration. public/Photo Gallery/WAR3.14.png

Engineering Models

public/Photo Gallery/Model1.png public/Photo Gallery/Model2.png public/Photo Gallery/ExplodedModel.png

Engineering Analysis

public/Photo Gallery/NateAnalysis1.png

public/Photo Gallery/NateAnalysis2.png

public/Photo Gallery/NateAnalysis2.png

PVC Durability Research here

Bill of Material (BOM)

The following is a screenshot of the BOM at one point in time to show the updated format and information. This document is subject to change with continuous updates from the team as progress is made. The link to the updated live document can be found here

public/Photo Gallery/BOM_12.3.JPG

The following is a screenshot of the financial expense tracker at the time of this design review. The document is subject to change as the team makes additional purchases of material in MSD II. The link to the current live document can be found here

public/Photo Gallery/ExpenseTracker_12.3.JPG

Test Plans

Test plans were developed to verify the successful functionality of the device in MSD II.

Functionality Test

The first test will determine the success on a pass or fail basis on whether the device seat can raise and lower with a differential distance of 10 inches. This test will be included in the human testing trials as well to ensure users can successfully manipulate the controls to make the device raise and lower.

Link to document here

Piston Leak Test

The goal of this test is to determine the system’s ability to prevent leaking under different amount of air pressures.

Link to document here

Static Load Test

The goal of this test is to determine the stability and durability of the hydraulics under different applied forces. Further validate and ensure that the system is able to withstand appropriate amounts, while carries out its intended functionality.

Link to document here

Hygiene Test

This test will determine the time it takes for a subject to clean up to maintain the cleanliness of the device, and in the process evaluate the ease of cleaning. The goal is to be able to clean the device within 10 minutes and will be tested by the Test Engineer on the team. Another factor that will be recorded during the human testing trials will be if the user grips the toilet seat for support, as this would not pass our hygiene standards.

Link to document here

Safety Test

To meet the engineering requirement of safety, the human subjects research will gain feedback from the users as to how they felt during the safety. The device will also be put under extreme conditions such as the application of a large weight, the scenario of a user "wiggling" side to side on the device, and test the device at different levels of water pressure. All these scenarios will ensure that the device can still perform safely while in extreme usage conditions.

Link to document here

Risk Assessment

public/Photo Gallery/RiskAssessmentPhase4.JPG

Link to live document here

Design Review Materials

Notes from the Design Review can be found here

Plans for next phase

To prepare for MSD II, the team has outlined a preliminary schedule to start off the semester. The team will have all materials required for the build and test of the cylinder, with the building of the cylinder taking 1 week and the testing of the cylinder taking the second week.

From there, all final materials will be ordered and picked up. Since most of our materials have a lead time of less than 1 week once approved by the MSD office, the material will have arrived by the time testing is complete so the team can begin the building of the rest of the device.

The team needs to find a resource to help with the welding process.

Link to the outline of MSD II Action items, outline and prep here

Link to our Gantt Chart for MSD II here

Link to the team's MSD I Self-critique here

Links to each team members' Three Week Plan:

Rachel Ackles

Rachel Berry

Nate Bracalente

Don Phan

Daniel Vetere

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