P17007: Motor-Assisted Wheelchair 2.0/public/
Preliminary Detailed Design
Team Vision for Preliminary Detailed Design Phase
During this phase we plan to:
- Assess and update risk management as needed
- Finalize preliminary test plans
- Complete wheelchair and device designs in Creo
- Develop working knowledge of current prototype to include its strengths, weaknesses, and areas of improvement.
- Resolve customer requirements and engineering requirements to have an expected end-state.
- Utilize benchmarking of other concepts to assist with the refinement of device design.
- Calculate theoretical performances for product selection on the system overall.
- Simulate concepts applicable to device refinement.
- Create preliminary BOM and working budget.
- Prototype with available materials for any applicable proof-of-concept refinements.
During this phase we accomplished:
- Continue assessing risks and updating design as needed to eliminate risk
- Completed wheelchair design using CAD software; Creo
- Create a preliminary Bill of Materials
- Begin to theoretically calculate performance based on product selection
- Finalized all test plans and data acquisition strategies
- Gain a better understanding of strengths, weaknesses, and areas of improvement from previous prototype.
- Benchmark micro-controllers and speed control devices for user interface and overall device speed control.
Preliminary Sketch of DeviceThis preliminary sketch of the device was created to help develop a better understanding of the end goal. Having a compact design like the one shown below is a crucial improvement that can be successfully implemented through the use of a right-angle gearbox.
Using the motor purchased by the previous team, P16007, the Teknic motor (model: CPM-MCVC-3432D-RLN) will be able to provide the torque and speed needed to meet our requirements.
Feasibility: PrototypingThe following images represent the preliminary detailed design. This design will be improved throughout the next phase of the design process, but can be seen as the foundation for the final detailed design.
Improvements to this design already being considered include:
- Design of a metal frame that directly attaches from the cross bar to the gearbox to provide support (as opposed to attaching directly to the plastic enclosure).
- Elimination of potential twisting of the rod and attachment by a key configuration or other means.
- Design of the controls of the device. Bluetooth is currently seen as the best option.
- Vents in the box enclosure to allow necessary and proper air flow.
- Spring or tension system to ensure proper ground contact at all times, even over bumps and on rough terrain.
Bill of Material (BOM)
Design and Flowcharts
Design Review MaterialsPreliminary Detailed Design Review Notes
Customer Interview NotesFull List of Customer Interview Notes
Plans for next phase
Team Vision for Next Phase:
- Continue accessing and updating risks as needed
- Finalize CAD drawings
- Finalize all components for BOM
- Begin purchasing components we know will definitively be used
- Submit work and ideas to contests to possibly earn
- ARM Developer's Day
- National Instrument contest