1. Tub Lift Rev. 2
Dom
Group 16006

2. Agenda Project Statements Customer Requirements
Engineering Requirements
House of Quality
Functional Decomposition
Benchmarking
Systems Architecture
System Level Proposal
Feasibility
Concept Development
Risk Assessment
Test Plan
Project Plan
Questions
Dom

3. Project Statement
Theresa, a wheelchair user relies on a hydraulic power bath lift to assist her with entering and exiting her bath tub. Theresa has suffered from polio in the past and is gradually losing movement in her extremities as a result. The water-powered lift that she currently utilizes has been requiring frequent repairs due to its age (parts are becoming scarce, expensive and possibly unreliable). Development of a new, affordable and easy-to-use lift mechanism for her bathtub is desired. The final mechanism must be able to both lower, lift and rotate Theresa into and out of her tub in a timely manner, while taking into consideration the strict spatial constraints of her bathroom. An ergonomic and safe design is preferred.
Dom

4. Customer Requirements
Keep electronics and water separate
Chair must swivel
Unit cannot be permanent (can be removed)
Similar functionality to current unit
Equal or smaller size than current unit
Comfortable seat
Unit must be sanitary and durable in water
Chair can recline
Jake

5. Engineering Requirements
Jake

6. House of Quality
Alex K.

7. Functional Decomposition
Dom

8. Functional Decomposition
Alex B.

9. Functional Decomposition
Alex B.

10. Benchmarking
Alex B.

11. Base (Existing) Design
Alex K.

12. Base (Existing) Design Comparison
Alex K.

13. Custom Design 1
Alex K.

14. Custom Design 1 Comparison
Alex K.

15. Custom Design 3
Dom

16. Custom Design 3 Comparison
Dom

17. Systems Architecture
Jake

18. System Level Proposal - Overall System
Alex B.

19. System Level Proposal - Chair Spin
Alex B. / Jake?

20. Feasibility Analysis - Floor Jack Concept
Conducted a simple feasibility analysis to determine the piston diameter based on the floor jack design
Analysis only solves for the forces required to move the chair from the down position
Proved that this design was feasible
More, in-depth analysis is required to find the force to raise the chair at the speed that we desire
Alex B. / Jake?

21. Test Plan Test Reason Method Dependent Upon Water Pressure Test
Critical for design to be aware of water pressure available and if it can be altered
Visit customer home, test water pressure, attempt to increase if need be with customer permission
Customer availability, testing equipment
Piston Force Test
Pistons are required to generate a significant amount of force
Physically attach a piston to a water source to ensure we can achieve needed force
Water Pressure Test, Building/buying piston, having similar water source, testing apparatus
Electric Actuator Test
Investigate if previously purchased actuator and battery are suitable for the new design
Test for length extended, speed and force exerted
Charged battery, understanding of function (read manual)
Recline Testing
Customer may not have required core strength
Test recline system for strength needed to return to upright position
Speak with customer and evaluate if it is feasible for customer to use recline (could include and she could ignore)
Jake

22. Risk Assessment
Alex K.

23. Project Plan Additional Design Analysis (Mechanics)
Custom Design 1
Materials: Plastic/Aluminum
Create Bill of Materials
Begin thinking about vendors and ordering parts
Alex K.

24. Project Plan (MSD 1)
Ambition since this is the project’s second iteration:
Have a solid, realistic design ready to go
Begin finding vendors and order parts
Once parts have arrived, being assembly of our prototype
Test functions and incrementally improve design even further
Alex K.

25. Questions?