P18011: Wheelchair Accessible Restroom 2
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Integrated System Build & Test

Table of Contents

Team Vision for Integrated System Build & Test Phase

What did we plan to accomplish:

What we accomplished: We accomplished everything except for receiving all materials. The peg assembly for the armrests and the seat cover have been ordered, but have not arrived.

Design Updates

Updated Design for ID Capstone

Updated Design for ID Capstone

Design Feedback

We met with Chris after the frame and seat was assembled to get design feedback. Some of his suggestions for things to look out for are:

Attached are the full notes for Chris's Feedback.

Fabrication & Assembly

The frame was cut out using the water jet in the Brinkman workshop.

The frame was cut out using the water jet in the Brinkman workshop.

The hydraulic cylinders were pinned into brackets which were welded to the frame. The Hydraulic setup (valve and flow divider) was rigged to an apparatus for testing purposes.

The hydraulic cylinders were pinned into brackets which were welded to the frame. The Hydraulic setup (valve and flow divider) was rigged to an apparatus for testing purposes.

Test Results Summary

The lifting assembly was completed just recently, meaning the testing must be done from here out. Refer to the updated plan for test schedules.

Static/Dynamic Load Testing

Prior to installing the hydraulic system, a static load test was performed and it was deemed that the seat met our specifications. Below is a picture of the test. A video of the initial testing can be viewed here.
Static Load Test

Static Load Test

After the hydraulics system was installed, a preliminary load test was performed. With the testing done thus far, it appears that our design meets our specifications. Some further testing will need to be complete to verify this. Below is an image of the dynamic load testing.

Dynamic Load Test

Dynamic Load Test

 A Successful Dynamic Load Test

A Successful Dynamic Load Test

A more thorough load test was performed and the data is listed in the table below. For different weights, we tested how long it took the seat to lift, if the lift to extended height was successful, and if the descent of the seat was successful.

Dynamic Load Test Results

Dynamic Load Test Results

Here are images from the first 100 lb load test and then from the max load (405 lb) test.

Dynamic Load Test for 100lbs

Dynamic Load Test for 100lbs

Dynamic Load Test for Max Weight (405 lbs)

Dynamic Load Test for Max Weight (405 lbs)

As can be noted in the above results, the seat was unable to descend on its own until 190 lbs. So, the team performed further testing to find the exact threshold value. The weight was gradually reduced until the threshold was found to be 155 lbs.

Threshold Test Results

Threshold Test Results

Lift Height Testing

The height from the underside of the seat to the floor was measured before and after a lift to ensure that our lift height met our specification of 8 inches. Before the lift, the height was 18.5 inches, and after it was 26.5 inches, which means that our design exactly meets the requirement.
Lift Height Test

Lift Height Test

Footprint Testing

Some preliminary testing has been done to ensure that our design fits in an ADA bathroom. So far, our design seems to meet our specifications. Below is an image to show our preliminary footprint testing.
Preliminary Footprint Test

Preliminary Footprint Test

Further testing of our footprint gave us the below measurements:

So, the overall footprint is 420 squared inches. This value falls within our desires test plans value, so this test was a success.

The maximum distance from the wheelchair to the toilet seat was also measured and found to be 4.25 inches, which is slightly further than we had originally wanted, but was still within our allowable distance.

Risk and Problem Tracking

Below is our updated problem tracker.
Updated Problem Tracker

Updated Problem Tracker

Below is our updated risk management.

Updated Risk Management

Updated Risk Management

Updated Detailed BOM

Below is our updated Bill of Materials
Updated BOM

Updated BOM

A link to the full spreadsheet is here: Updated BOM Excel

Plans for next phase

Plans for Final Phase

Plans for Final Phase


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