This webpage summarizes the work done for Phase 1: Problem Definition for MSD I. This page includes summaries, snippets of data gathered, live document links and other information included in the final presentation.
Team Vision for Problem Definition Phase
- The goal for this phase is to identify any improvements that can be made from the previous model created.
- Our team developed requirements, engineering metrics, house of quality, benchmarking, and our project plan.
Project SummaryAn indoor dry toilet is a device that doesn’t utilize running water but instead collects waste for manual removal. The seat for this toilet allows for different wastes to be separated and removed more easily. This device should be able to be used by any person no matter their build and should be cost-effective. The current model is usable but some waste can miss the diverters and may not be contained. The plastic seats are also not very cost-effective and takes longer to construct. This device has been in development since 2005 but was put on hold because of the earthquake in 2010.
The end goals of this project is to design and manufacture a full seat that is ergonomically sufficient for all users while also being aesthetically pleasing, and easily movable by a single person. It must also be less expensive than what it is currently while also being 100% usable. The product should be manufactured locally and the management of urinal waste should be easier and possibly customizable in terms of collection methods.
A link to our project summary can be found here.
Use CasesTo understand the requirements of our stakeholders use scenarios were created to determine how our project would be used. Additionally, the scenarios highlight any improvements we could make to improve efficiency.
The use scenarios include:
- How stakeholder interact with our project
- Steps different genders take to use the product
- How waste is collected
Below are the use scenarios created.
A general use case can be seen below
A user specific use case can be seen below.
Project Goals and Key Deliverables
- To design an ergonomic dry toilet base with an improved diverter system
- Design a more efficient and customizable excrement collection method
- Working prototype of a redesigned ergonomic toilet base with an improved diverter system
- Custom waste collection methods
- Cutting costs in manufacture by making all or most of the parts of the toilet locally
- Detailed design documentation with design changes
A list of stake holders was created to better identify who would be benefiting from this project.
Customer Requirements (Needs)
The Customer Requirements will be used to design the product to best satisfy the customer along with the users.
To decide the customer requirements, an interview was conducted with an employee from SOIL who worked hand-in-hand with the customer during prior iterations of this project.
Weights were assigned to each requirement based on the information obtained from the interview. This priority ranking was done by giving each requirement a number (1, 3, 9); 9 was the highest priority and 1 was the lowest priority. These values will be used in the House of Quality assessment.
A snapshot of the weighted customer requirements can be found below.
In addition to a snapshot, a link to the live document is included here. This also includes the data for our Engineering Metrics and the House of Quality analysis.
Engineering Requirements (Metrics & Specifications)
This was done to create a list of criteria that is definitive to the product and cannot be swayed by much to help with overall customer satisfaction.
In addition to a snapshot, a link to the live document is included here. This also includes the data for our Customer Requirements and the House of Quality analysis.
Assumptions & Constraints:
1. The final product will be a dry toilet which is ergonomic and moveable
2. Cost of production will be reduced through local manufacturing (<$45)
3. The weight of the product will be easily carried by one person
4. The base of the toilet will be compatible with the 5-gallon buckets being used
5. Diverter will be more ergonomic and work for people of different sizes
House of Quality
This House of Quality was drawn to get a visual representation of what the biggest priorities are going forward. This conclusion was reached by comparing the Customer's Requirements to the Engineering Metrics. We received a prioritized list from the customer and used it to create the house shown below.
In addition to a snapshot, a link to the live document is included here. This also includes the data for our Customer Requirements and Engineering Metrics.
We decided that the Risk Assessment should be added to this page, as it is important to know what would be thought of when it comes to issues that could happen in the future.
Design Review Materials
Our Design Review will be held on September 13th, 2018.
Included here are links to:
- Notes from review
- Action items
Plans for next phase
For the next phase, we plan on moving forward with basic concepts of our design. As of now we plan on:
- Researching materials that could be used for the product
- Finalizing the ergonomic standards needed for the toilet
- Look at and decompose the subsystems used for the design
- Continue meeting with Sarah Brownell
- Develop a basic test for our plan
We will also develop an in-depth project plan after the review has completed.
As individual team members, we have also created personal plans for the next three weeks, which can be found below: