Integrated System Build & Test with Customer Demo
Table of Contents
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All template text must be removed prior to your System-Level Demo with Customer
Team Vision for System Level Demo with CustomerSummarize:
Full Chair Prototype
The assembled prototype roughly shows the locations and function of all the major components of the chair. The basic functions work and overall capabilities of the chair will improve as various issues are addressed.
Test Results SummaryThe standing/ sitting motion of the automatic wheelchair was tested each time a change was made. The images and descriptions below show the current status of the sub-assemblies based on the standing/sitting testing. Changes from last review are also noted below.
Base SubassemblyThe images below show how the chair is resting on the back posts when in the seated position. As you can see, the frame of the chair is hitting the back post on the front corner. In order to fix this problem, we plan on adding a chamfer to the back posts and then welding a platform to the back tabs of the frame.
Another issue that arose was that the welds on the original frame were not adequate. The welds did not penetrate the material. While testing, one side of the frame snapped off at the weld locations. To fix this problem, both sides of the frame were re-welded correctly. The image below shows the new welds. The frame was tested and were proven to be strong enough.
Lift SubassemblyThe front posts were raised so that the user's knee will rotate at the correct location. The front posts were then welded to the wheelchair base. Testing afterwards showed that the chair was much sturdier and the final standing angle was closer to the desired nominal value.
During testing, it was evident that the lever arm extension was rotating in the actuator. To correct this issue, a small metal plate was welded to the top surface. This helped to correct the problem and allowed for smoother motion.
The rear part of the parallel link system was welded together. During testing it was evident that the parallel link system works as intended.
Restraint SubassemblyThe foot plate now includes the two casters and one guiding caster. The pin is attached to the foot plate subassembly and will allow the care professionals to remove the foot plate much easier. The foot plate is set to the correct height so that the user's feet will rest on the top of the footplate and her knee will be in the correct location. A non-slip material will be added to the top of the foot plate.
In order to save money, a family member of one of the team members made the chest restraint. We are planning to have two buckles on each side of the chair back in order to attach the chest restraint so that it is easily removable. The custom chest restraint is padded and comfortable and will fit nicely across the user's chest. Testing will be done to ensure the straps and buckles have the necessary strength.
Power SubassemblyThe power and control systems were tested continuously during the testing of other systems and has proved to be functional and reliable. Steps are being taken to restrain the wires and integrate them into the chair frame to reduce the potential for damage.
Test PlanPreliminary tests have been done successfully. Final testing will start as the schedule below suggests. To see the current version of the Test Plan, click the following link: Test Plan
Problem TrackingTo view the latest problem tracking, as of 4-14-16, click on the following link Problem Tracking.
Functional Demo MaterialsInclude links to:
- Presentation and/or handouts
- Notes from review
- Action Items