Preliminary Detailed Design
|MSD I & II||MSD I||MSD II|
Phase 3: Preliminary Detailed Design
Review of Team Vision for Preliminary Detailed Design PhaseBelow is the team vision for the Preliminary Detailed Design Phase, showing the completion status of each task planned for this phase.
The team vision for Phase III, created at the end of Phase II. The completion status of each task is shown.
As the team vision above shows, a large number of tasks that were originally planned for this phase were not completed. We struggled to identify a mutually convenient time to meet with the staff of St. Joseph's to discuss the systems-level concepts that were generated. As a result, final selection of a systems-level concept was delayed by two weeks.
When our meeting did finally take place, our concepts were greeted with mixed reactions. It was decided that our 'cart' concept for storage of guests' personal belongings was viable, but that our concepts for storing sleeping materials were undesirable because they take up valuable floor space. We had to go back to the systems-level drawing board. Thus, our original vision for a "preliminary detailed design" phase morphed into a second-iteration of the "systems level design" phase.
Relevant DocumentsBelow is a list of links to the "live" documents created or updated during Phase III of the project. Screenshots of these documents are shown throughout this page.
- The Phase III team vision (Microsoft Word .docx format) (Microsoft Excel .xlsx format)
- The Phase III individual visions (Microsoft Word .docx format)
- The updated engineering requirements (Microsoft Excel .xlsx file)
- The updated functional decomposition (Microsoft Visio .vsdx file)
- The updated morphological table (Microsoft Word .docx file)
- The re-iteration of Pugh's method (Microsoft Excel .xlsx file) See the "Shelter (3)" tab for the most recent iteration of sleeping material storage concepts.
- The feasibility analysis documents
- The test plans
- The risks assessment, updated through Phase III
The following links are to "live" documents that establish the team's project plan for Phase IV:
- The Phase IV team vision (Microsoft Word .docx format)
- The Phase IV individual visions (Microsoft Word .docx format)
Updated Engineering RequirementsAs part of our test planning, an assessment of the engineering requirements was conducted. We reviewed each requirement and discussed how a test would have to be structured in order to verify that the requirement was fulfilled. Changes to the engineering requirements are as follows:
- Removed. This requirement would be impossible to test with our time constraints, and lifespan of the sleeping materials is a low priority for St. Joseph's.
- Edited. This purpose of this requirement is to ensure that the whatever system is developed does not interfere with the hospitality and meal services provided by St. Joseph's. Previously, this requirement read "Number of guests who can be accommodated for hospitality". In that formulation, the requirement is difficult to test. The new wording (see below) ensures that the system does not usurp an excessive amount of floor space, thereby enabling hospitality and meals to continue relatively undisturbed. We will need to have more conversations with the customer and do more research to establish a marginal value.
- Removed. This requirement is impossible (and undesirable, since we'd rather not deal with bed bugs!) to test.
- Edited. The purpose of this requirement is to ensure that guests/staff do not have to lift mattresses above a comfortable height (for example: waist height). Previously, this requirement read "Altitude of sleeping material storage location above ground level". As written, this requirement would have prevented storage methods that hang from the ceiling of the hospitality room, so the wording of this requirement was changed to more accurately reflect the intent of the requirement.
- Removed. This requirement was redundant because of ER 17.
- ER15, ER16
- Removed. These requirements do not address functionality that can be delivered by our system, and are therefore beyond the scope of our project.
- Edited. This requirement was reworded to capture the intent of ER11.
- Added to ensure that the personal belongings storage system is designed with adequate strength to support all the guests' belongings.
- Added to ensure that any hanging systems for storing the sleeping materials will give adequate "head room" for the people in the hospitality room.
The updated engineering requirements table is shown below. The live document can be found here (Microsoft Excel .xlsx file).
Updated Functional DecompositionThe functional decomposition that was created in Phase II was fundamentally flawed, and so it was updated in Phase III. The previous version was written in terms of actions that needed to be performed by the staff of St. Joseph's, but it should have been written in terms of functions that our system must deliver. The updated version (shown below) has been written in terms of functions that our system must deliver, and focuses on the "provide shelter" branch of the original functional decomposition.
Systems Level Concepts Review with St. Joseph'sWe met with the staff of St. Joseph's to review our concepts and obtain feedback. The key points of discussion are summarized below.
Notes from the Meeting
- October 31, 2016 @ 10:30AM
- St. Joseph's second floor
- Who attended :
- St. Joseph's Staff: James Murphy, Sam
- MSD Team: Connor Pierce, Ezra Weinstein, Ken Postel, Sharon Im
Update on the current progress and feedback
- St. Joseph's will purchase their own beds.
- Mattresses are 4.5 in. thick
- Weighs 17.5 lbs
- Material usage:
- Bed bugs will go into wood, so cannot use wood
- Wall mount/aerial sleeping material storage
- Pulley, winch idea
- Liked the previous MSD team cot hanging idea
- Storage in the hospitality room at floor level is a possibility if the MSD team can make a very convincing argument
- No women will be accepted at the shelter
- Shelter operations starts on November 1, 2016
- Likes the cart idea.
- Okay with the cabinet idea as long as it does not take too much space.
- Waiting to decide on a storage unit
- Feedback on selection criteria:
- "Low cost" and "low effort to install" are not high priorities
- "Ease of use" is not a high priority
- Aesthetics is not a high priority - as a matter of fact, don't make it too fancy or flashy because that's not part of the identify of St. Joseph's. Remember, "voluntary poverty"
Updated Selection CriteriaAfter our meeting with St. Joseph's, a further look at the sleeping arrangements required an updated selection criteria list. In order to simultaneously assess the new sleeping arrangement concepts and the previous concepts, selection criteria were updated based on the customer needs in order to ensure that the concepts would meet the customer requirements. Below is the updated list of the selection criteria.
|Selection Criteria||Customer Needs|
|Lower effort to clean up/ set up||SA6|
|User (guest/staff) safety||SA6/S4/S6|
|Space (Floor footprint) efficiency||SA2|
The selection criteria related to storage were removed as the customer was content with the storage options suggested. However, as there was a need to further delve into the sleeping arrangement designs, the selection criteria in the table above are to be considered the needs for the new sleeping arrangement concepts. The concepts were used for the Pugh's Selection Method.
Cell Phone Sleeve
Metal Frame and Gears
Easy to Use
Little Effort to Use
Updated Morphological TableAfter the Phase II gate review, the team reiterated through the morphological chart in order to include more concepts for the morph key "allow easier access to material," in order to introduce new ideas that were generated throughout Phase III. The main ideas generated were mostly related to aerial storage for the sleeping material, which included the pulley, winch, and crane ideas. These were further looked into to broaden our scope to ensure that all concepts were not dismissed half heartedly. 2D sketches were drawn for ideas regarding these new function concepts. The updated morphological table is shown below.
The updated morphological table. Note that the table now includes more concepts for aerial storage as well as concepts for protecting the sleeping material.
Concept SketchesPer the feedback we received from St. Joseph's, we developed concepts for suspending the sleeping materials from the ceiling of the hospitality room. The concepts we developed included:
- "Sleeves" into which the mattresses would be
inserted. The sleeves will have grommets through which a
rope or cable can be passed. The rope will lift the
sleeve and mattress, and the mattress will hang from the
wall of the shelter. This design was inspired by the cell
phone sleeve shown in the benchmarking table above. This
is an adaptation of the earlier idea for wall-mounted
mattresses. The sleeve removes the necessity of modifying
the mattress with magnets or hooks, because modifying the
mattress could compromise the integrity of the bed
bug-proof cover. There are two options for suspending the
- "Clothesline" style, in which a single continous cable passes through all of the grommets in 6 to 7 mattresses, which are lined up along the hospitality room wall. The mattresses will be lowered down the wall and will land exactly where they are to be placed in the shelter layout. Many mattresses can be raised or lowered at once. One downside of this concept is that the mattresses cannot be moved to other locations in the shelter.
- "Hook and clip" style, in which each sleeve is connected to one cable. The cable can be clipped and unclipped from the sleeve, allowing the sleeve to be moved around the shelter to where it is needed. A downside of this concept is that many cable systems and winches are needed.
- Cargo nets, which would hang from the ceiling of the hospitality room. Five to seven mattresses would be suspended in each of the three to four nets, which would be hung at different locations on the hospitality room ceiling. Each net would be raised or lowered by a winch.
- "Platform" hoist, in which the mattresses or sleeping
materials can be stacked on a platform which is then
raised up to the ceiling to clear the hospitality room.
There are two variations of this concept:
- Single platform - all sleeping materials are stacked on a single platform. An advantage of this system is that only one winch must be operated to raise or lower all the sleeping materials.
- Multiple platforms - a number of smaller platforms are suspended at various points in the hospitality room. This system would require more winches, but would distribute the weight of the sleeping materials to more locations on the ceiling.
Sketches of the concepts are shown below.
Concepts for suspending the sleeping materials from the ceiling and/or walls of the hospitality room. Left: "sleeve" used for suspending mattresses along the walls of the hospitality room. Second from left: cargo nets for suspending sleeping materials from the ceiling. Bottom right: "platform" for suspending sleeping materials from the ceiling. Middle right: depiction of cargo nets hanging from the hospitality room ceiling. Top right: mattresses will be stacked six or seven high on the platform or in the cargo nets.
Pugh's Analysis (Including Aerial Concepts)
The second iteration of the Pugh's Method analysis, which focused on storage of sleeping materials and included aerial storage concepts.
Small-Scale PrototypingA small-scale model (1inch = 2feet) of the hospitality room was constructed. Small-scale models of the single-platform lift and the cabinet benches were constructed to investigate the space usage of those concepts.
Photo of the small-scale models that were constructed. Note: the cabinet benches and the platform lift are separate concepts which are not designed to be implemented together. They are shown together here for a comparison of scale.
Feasibility AnalysisPlans for feasibility analyses were developed, so that once a concept has been selected we can analyze critical aspects of the design. The documents outlining the analyses to be conducted are linked below. All documents are Microsoft Word .docx format.
- Analysis of the time to set up and clean up the sleeping materials
- Analysis of the floor layout for the hospitality and dining configurations of St. Joseph's
- Analysis of the floor layout for the shelter configurations of St. Joseph's
- Analysis of the visual appeal of the system implemented at St. Joseph's
Test PlansPlans were developed to test the system's performance relative to each engineering requirement. The plans are formatted as test reports, with the plan comprising the Set-Up and Procedure sections of each report. This format will enable us to save time in MSD II when the tests are performed. The test plans are only preliminary at this stage, and will be updated to be more detailed and specific once a systems-level concept has been selected.
Links to each test plan are included below with a short description of each test: (all test plans are in Microsoft Word .docx format)
- Test Report 0001: setup time
- Test Report 0002: cleanup time
- Test Report 0003: number of guests that can be accommodated for shelter
- Test Report 0004: time to retrieve a guest's belongings outside of shelter hours
- Test Report 0005: staff satisfaction survey for personal belonging storage
- Test Report 0006: lateral distance sleeping materials are moved
- Test Report 0007: vertical distance sleeping materials are lifted
- Test Report 0008: mattress dimensions
Risk AssessmentThe risk assessment document was updated with new risks that came up during Phase 3. The four risks that were added were hospitality space utilization, insufficient data, difficult data collection, and test plans errors. Of these additional risks, the ones to worry about the most were the data related risks. In order to mitigate these risks, the team will have to carefully plan how data will be collected and schedule in advance when and what data will be collected.
The updated risk assessment. Risks added in Phase III are identified with yellow highlighting in the 'ID' column.