Content related to this node should go in the [[Detailed Design Documents]] directory unless you have made other arrangements with your guide ahead of time. ==Team Vision for Preliminary Detailed Design Phase== Summarize: *What did your team plan to do during this phase? **Reverse engineer sterilizer for understanding of EE and MECE subsystems **Analyze cleaning solutions to determine whether soap of ultrasonic is the optimal solution. **Finalize system level design **Preliminary BOM **Preliminary test plan **Review Gantt chart **Determine next steps and actions items for upcoming phase **Update engineering and risk requirements **Create list of technical questions **Finalize bacteria testing protocol *What did your team actually accomplish during this phase? **Finalized prototype decision **Master risk assessment **Engineering questions **Master test list **BOM (~35% complete) **Tests completed ***Volume test ***Drying test ***Noise test ***Time study **Preliminary schematics **Preliminary CAD ==Engineering Questions List== *How much water do we need? How much total volume? *How much power per stage/total? *How will the microcontroller handle user input? *How long will it take to dry with heat and air/ no heat and air/ just heat and no air? *Will ultrasonic be too loud? *Will the Medella Soap work? *How does an already existing system work? *How does on/off mechanism work? *What requirements exist for ultrasonic/U.V? *Will ultrasonic clean well enough? *What defines “clean” and “sterilized”? *What material will we need for the casing? *Will U.V work against cracks? If not, will reflective surfaces or something else assist in this? *How can we drain water? Where does water need to be introduced? Filtering? *Can we add a component to the bottom of the ultrasonic bath surface and still remain effective? *How can we mitigate vibrations? *What other options for efficiently manufacturing plastic are there (ABS/PLA are used at RIT) == Feasibility: Prototyping, Analysis == === Avent Steam Sterilizer Reverse Engineering === '''Purpose''' - To analyze current sterilizer that utilizes steam by way of heated plate. '''Procedure''' *Disassembled the structure to get to the wiring of the device *Powered on the device and looked at the voltage at different points *Analyzed the switching mechanism used '''Results/Conclusion''' *There was one security screw in the device *Switching is done through a flange mount thermostat switch. Once the device is heated up then the switch is open and once it cools then the switch is left open but with the option of closing the switch once pressed again. [[Image: Detailed Design Documents/Avent Sterilizer Reverse Engineering 2.png|frame|left|500px|Avent Steam Sterilizer Base Assembled]] [[Image: Detailed Design Documents/Avent Sterilizer Reverse Engineering 1.png|frame|right|500px|Avent Steam Sterilizer Base Disassembled]] [[Image: Detailed Design Documents/Thermostat Switch.png|frame|center|200px|Avent Steam Thermal Switch]] [[Image: Detailed Design Documents/Avent Steam Sterilizer Wiring Diagram.jpg|frame|center|500px|Avent Steam Sterilizer Wiring Diagram]] === Ultrasonic Cleaner Reverse Engineering === '''Procedure''' *Disassembled the structure to get to the wiring and board of device *Analyzed the chips and signal generator used *Reassembled, retested *Breakdown of Ultrasonic Cleaner **Signal generator **PCB to Transducer '''Results/Conclusion''' *We do not need a PCB specifically for power. A signal generator board would work and be attached directly to the transducer [[Image: Detailed Design Documents/Ultrasonic Cleaner PCB.jpg|frame|center|500px|Ultrasonic Cleaner PCB]] == Drawings, Schematics, Flow Charts == ===Mechanical Design=== [[Image: Detailed Design Documents/CAD/Base.png|frame|center|600px|Base]] [[Image: Detailed Design Documents/CAD/Base_Assembly.png|frame|center|600px|Base_Assembly]] [[Image: Detailed Design Documents/CAD/DiaphramTrayDrawing.JPG|frame|center|600px|Diaphram Tray Drawing]] [[Image: Detailed Design Documents/CAD/RackBaseDrawing.JPG|frame|center|600px|Rack Base Drawing]] [[Image: Detailed Design Documents/CAD/RackLidDrawing.JPG|frame|center|600px|Rack Lid Drawing]] [[Image: Detailed Design Documents/CAD/Spring_Hinge.png|frame|center|600px|Spring Hinge]] ===Electrical Design=== [[Image: Detailed Design Documents/Power Flow.jpg|frame|center|600px|Power Flow]] [[Image: Detailed Design Documents/Rough System Wiring.jpg|frame|center|800px|Rough System Wiring]] [[Image: Detailed Design Documents/Power Supply Circuit Diagram.png|frame|center|500px|110VAC to 5VDC Power Supply Schematic]] [[Image: Detailed Design Documents/Pseudocode.png|frame|center|500px|Preliminary Pseudocode]] == Bill of Material (BOM) == [[Image: Detailed Design Documents/BOM.png|frame|center|1000px|Preliminary BOM]] == Test Plans == [[Image: Detailed Design Documents/Test Plan.jpg|frame|center|500px|Test Plan]] ===Time Study=== '''Item Tested:''' Process layout - Efficiency in the current cleaning process at NICUs '''Responsibles:''' Angelo Vitelli '''Scope:''' Observe and measure the time spent to clean breast pump parts in the NICU '''Motivation:''' Understand the current procedures being used by the parents to clean the breast pumps. The goal is to collect data and design a process layout map in order to identify improvement opportunities for the product design and address opportunities within the process and system being implemented. '''Procedure:''' Observe and record the steps taken by the parents in order to complete a washing cycle. Four different processes were observed. The time and steps were recorded for each step in the process. '''Results:''' All the mothers, used for the observation and time study, cleaned the breast pump parts in less than 15 minutes. Because of the different steps, it can be concluded that the process is not standardized. '''Conclusion:''' The process being used by parents in the NICU is not standardized but follow similar steps. There are improvement opportunities and the number of steps (value and non-value added) can be minimized by implementing the process improvement solution that the team has been working on. '''Next Steps:''' Create a flow map of the current process being used, quantify value added steps, and compare the current state to future state. [[Image: Detailed Design Documents/Time Study Results.jpg|frame|center|500px|Time Study Results]] [[Image: Detailed Design Documents/Data Plot Time Study.jpg|frame|center|700px|Time Study Data Plot]] Complete data located [[Detailed Design Documents/Time Study Analysis.xlsx | here]]. ===Manual Washing Test=== '''Item Tested:''' Washing process layout '''Responsibles:''' Angelo Vitelli & Rachel Wu '''Scope:''' Quantify and measure the time and steps needed to complete a full cycle. '''Motivation:''' Understand the current procedures being used by the parents to clean the breast pumps. The goal is to collect data and design a process layout map in order to find improvement opportunities for the product design. This test also add to the human interaction research part that the group wants to propose in the design. '''Procedure:''' Observe and record the steps taken by the parents in order to complete a washing cycle. Time study and Value Stream Mapping (VSM). '''Results:''' Parents like the product but cost can be an issue. Time study was inconclusive because of the sample size and number of observations. '''Conclusion:''' Product has the capacity of improving the current procedures used for cleaning but concerns and efficiency might change since it will be used for house applications. '''Next Steps:''' Collect more data for house applications and compare to the results obtained from the NICU time study [[Image: Detailed Design Documents/Manual Washing 1.jpg|frame|center|500px|Parent Manually Washing Pump Parts]] [[Image: Detailed Design Documents/Manual Washing 2.jpg|frame|center|500px|Pump Parts Air Drying]] ===Volume Test=== '''Question Answered:''' What is the max/preferred volume of water for the system? '''Procedure(s):''' Method 1 - Took each part and estimated a volume for each (simple shapes). This is an extremely conservative method. -- Status: Complete *4 caps = 37.7 in^3 *4 bottles = 72 .0 in^3 *2 flanges = 28.27 in^3 *2 flange connectors = 18.0 in^3 *2 diaphragms = 1.57 in^3 *2 diaphragm connectors = 2.37 ^3 *Total volume = 159.9 in^3 = 0.69 gallons for parts '''Conclusions:''' This is an extremely conservative method but it gives us an estimated value to work with. Method 2 - Displacement test -- Status: In-process Method 3 - CAD-based volume analysis -- Status: In-process ===Drying Test=== '''Question Answered:''' Which method of drying is most efficient? '''Materials:''' Hair Dryer, Cardboard box, plastic box, circe drill, tape, timer, water, parts '''Procedure:''' #Prepare both cardboard box and plastic box to fit the hair dryer #Seal loose edges with tape or adhesive #Add wet parts into the box #Run hair dryer at a set time #See if dry, repeat for different times '''Results:''' For the cardboard box, the hair dryer was run at hot at 2 minutes, warm at 5 minutes. Both resulted in dry parts. The hot trail resulted in parts being too hot to touch. The warm trial was fine. The cardboard box leaked air. '''Conclusion:''' Plastic box trail should be tested Status: Cardboard = complete. Plastic = In-process ===Noise Test=== '''Question Answered:''' Will the ultrasonic vibrations cause a sound that is higher than 50 dB? '''Materials:''' Decibel reader, water, ultrasonic cleaning device '''Procedure:''' #Add water to the ultrasonic device #Run and record the decibel reader to get a “zero” value #Turn on the ultrasonic device #Record the value from the decibel reader '''Results:''' “Zero” value of 62.8 dB. The “On” value of 80.1. '''Conclusion:''' The difference is 17.3 dB which is under the 50 dB limit. This is a rough estimation. Note: the device does suggest a calibration however time and resources made this difficult. The difference method gives us a rough enough idea that ultrasonic is still viable. Status: Complete [[Image: Detailed Design Documents/Noise Test.jpg|600px]] == Design and Flowcharts == [[Image: Detailed Design Documents/Transformation Diagram.jpg|frame|center|800px|Updated Transformation Diagram]] [[Image: Detailed Design Documents/System Architecture.jpg|frame|center|800px|Updated System Architecture]] [[Image: Detailed Design Documents/Process Flow.jpg|frame|center|800px|Updated Process Flow]] == Risk Assessment == Legend: *Green: New Risks *Blue: Updated Risk *Red: Removed Risk [[Image: Detailed Design Documents/Risk Assessment Phase 3 Part 1.png|800px|Risk Assessment Phase 3 Part 1]] [[Image: Detailed Design Documents/Risk Assessment Phase 3 Part 2.png|800px|Risk Assessment Phase 3 Part 2]] == Design Review Materials == [[Detailed Design Documents/Phase III Review Presentation.pptx|Presentation]] * Notes from review ==Plans for next phase== [[Detailed Design Documents/3-Week Plans (Phase 4)/Team Three-Week Plan.docx|Team three week plan]] Individual Plans: * [[Detailed Design Documents/3-Week Plans (Phase 4)/Angelo Three-Week Plan.docx|Angelo's 3-Week plan]] * [[Detailed Design Documents/3-Week Plans (Phase 4)/Kyla Three-Week Plan.docx|Kyla's 3-Week plan]] * [[Detailed Design Documents/3-Week Plans (Phase 4)/Christopher Three-Week Plan.docx|Christopher's 3-Week plan]] * [[Detailed Design Documents/3-Week Plans (Phase 4)/Yohance Three-Week Plan.docx|Yohance's 3-Week plan]] * [[Detailed Design Documents/3-Week Plans (Phase 4)/Jake Three-Week Plan.docx|Jake's 3-Week plan]] * [[Detailed Design Documents/3-Week Plans (Phase 4)/Meg Three-Week Plan.docx|Meg's 3-Week plan]] * [[Detailed Design Documents/3-Week Plans (Phase 4)/Rachel Three-Week Plan.docx|Rachel's 3-Week plan]] ---- [[Home]] | [[Planning & Execution]] | [[Imagine RIT]] [[../public/Problem Definition|Problem Definition]] | [[../public/Systems Design|Systems Design]] | [[Preliminary Detailed Design]] | [[Detailed Design]] [[Build & Test Prep]] | [[Subsystem Build & Test]] | [[Integrated System Build & Test]] | [[Customer Handoff & Final Project Documentation]]