p15073: autonomous iv stand system design review
DESCRIPTION
P15073: Autonomous IV Stand System Design Review. Michael Binger, Caitlin Conway, Nick Goddard, Nick Jacobs, Christina Pysher, & Ethan Whritenor. Thursday October 2, 2014. Team Introduction & Roles. P15073: Autonomous IV Stand. Agenda. Background System Analysis HOQ Relationship Diagram - PowerPoint PPT PresentationTRANSCRIPT
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P15073: Autonomous IV StandSystem Design Review
Michael Binger, Caitlin Conway, Nick Goddard, Nick Jacobs, Christina Pysher, & Ethan Whritenor
Thursday October 2, 2014
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Team Introduction & Roles
Team Member Expertise Team Role
Michael Binger ME Project Manager
Caitlin Conway EE Team Member
Nick Goddard ISE Project Planner
Nick Jacobs EE Team Member
Christina Pysher BME & ME Team Facilitator
Ethan Whritenor ME Team Member
Michael Zona Xerox Engineer Guide
P15073: Autonomous IV Stand
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Agenda● Background● System Analysis
o HOQ Relationship Diagramo Functional Decomposition
● Concept Development● Engineering Analysis● Proposed System Level Design● Risk Assessment● Test Plan● Updated Project Plan
P15073: Autonomous IV Stand
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Background - Problem Statement
P15073: Autonomous IV Stand
The goal of this project is to create an autonomous IV stand that follows patients. Compared to a traditional IV stand, additional improvements will be made such as reducing its footprint and enabling it to carry more IV bags.
Deliverables:
● Create a simple and ergonomic system for patients, and medical staff to use and manage several different IV bags and medical devices for each patient.
● Create a prototype of the autonomous IV stand and perform significant testing to verify the design and safety.
● Meet FDA standards for an IV stand and other similar medical devices
● Reach stage of clinical trials● Produce a marketable product
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Background - Customer RequirementsP15073: Autonomous IV Stand
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Background - Engineering RequirementsP15073: Autonomous IV Stand
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System Analysis - HOQP15073: Autonomous IV Stand
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Pareto ChartP15073: Autonomous IV Stand
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Functional DecompositionP15073: Autonomous IV Stand
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Alternate ViewP15073: Autonomous IV Stand
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Concept Development
● Morphological Chart● Concepts● Pugh Diagrams● Benchmarking● Feasibility Analysis● Budget Assessment
P15073: Autonomous IV Stand
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Morphological ChartP15073: Autonomous IV Stand
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ConceptsP15073: Autonomous IV Stand
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Pugh ChartP15073: Autonomous IV Stand
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Pugh ChartP15073: Autonomous IV Stand
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Proposed System Level Design
P15073: Autonomous IV Stand
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Omni - wheel function
Here is a short youtube video of the type of wheel system we will be using.
P15073: Autonomous IV Stand
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Feasibility Analysis
● Center of Gravity● Required Torque● Acceleration Stability● Power Requirements● Sensor Analysis
P15073: Autonomous IV Stand
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Center of Gravity Calculations
Assumptions
● symmetric about y-axis● ¼ in Aluminum 6061 used for base casing● 4 omni wheels utilized● Base is at max 1.75 ft across● All weights are estimates made ● Height Range: 1.73m - 2.52m
Calculations
P15073: Autonomous IV Stand
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Balance RequirementP15073: Autonomous IV Stand
Values Utilized
Equations Utilized
Moment taken about bottom left corner
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Motor RequirementP15073: Autonomous IV Stand
Assumptions:● Wheel diameter: 6
inches● Weight/wheel: ~5lbs● Coefficient of RR
Findings:● Price point: $43-150
per motor
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Sensor AnalysisP15073: Autonomous IV Stand
Detect Objects
Detect Patient
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Power RequirementP15073: Autonomous IV Stand
Componet Voltage Reqs (VDC) Current Reqs(mA) Power Reqs (W) Comments
Arduino Uno 12 410 4.92 40mA per I/O and 50mA per 3.3V I/O
Sonic Ping 1 5 30 0.15 Power straight from battery
Sonic Ping 2 5 30 0.15 Power straight from battery
CMUCAM5 Pixy
5 30 0.15 NOT REVERSE POLARITY PROTECTED
Battery level ind.
- - - Power straight from battery
Alarm* 3.3 15 0.0495 None selected
Display 5 30 0.15 Power straight from battery
Drive motor 1 12 833 9.996 Power straight from battery current is approx
Drive motor 2 12 833 9.996 Power straight from battery current is approx
Drive motor 3 12 833 9.996 Power straight from battery current is approx
Drive motor 4 12 833 9.996 Power straight from battery current is approx
Total 83.3 3877 45.5535
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Electrical Block DiagramP15073: Autonomous IV Stand
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Budget Assessment
P15073: Autonomous IV Stand
Item Price Quantity Unit Total
Top Pole $20.00 1 6 ft $20.00
Bottom Pole $20.00 1 6 ft $20.00
Aluminum $250.00 1 ft^2 $250.00
Motors $65.00 4 EA $260.00
Omni Wheels $23.00 8 EA $184.00
Pixy Camera $70.00 1 EA $70.00
Ultrasonic Sensors $25.00 2 EA $50.00
Arduino $23.11 1 EA $23.11
Battery EA $0.00
LCD Display $7.00 1 EA $7.00
Shipping $50.00 1 EA $50.00
Contingency $100.00 1 EA $100.00
Total: $1,014.11
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Project Risk AssessmentP15073: Autonomous IV Stand
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Technical Risk Assessment P15073: Autonomous IV Stand
# Risk Cause Effect L S I Action to Mitigate Action to Remediate Owner
1Prototype Runs Into
ObjectsMalfunctioning guidance
systemPrototype fails to follow the
patient1 9 9 Test guidance system extensively
Change or reprogram guidance system
Caitlin & Nick J.
2 Overheatingelectronic components,
environmental interference
damaged components 3 9 27 thermal analysis, safety guidelines Add ventilation Caitlin & Nick J.
3Integration of hardware
and software failsincompatibility non-working prototype 3 3 9 test compatibility
read product specifications before purchasing and ensuring compatibility
Caitlin & Nick J.
4 Battery Integration battery failure/fire underperforming 1 9 9 get new batteryconsult expertise about battery
usageCaitlin & Nick J.
5 Durability failure component malfunction system failure 3 9 27 environmental testing calculations prior to purchase Caitlin & Nick J.
6 Failure to move motor failure stationary IV stand 1 9 9 back up motor verify motor specificationsEthan, Mike &
Christina
7 Failure to turn motor failure straight line travel only 3 9 27 Back up motor verify motor specificationsEthan, Mike &
Christina
8 Failure to hold IV bagsfailure holding mechanism
IV bags not transported 1 9 9Perform load testing on holding
mechanismFortify holding mechanism
Ethan, Mike & Christina
9Does not traverse
across rough terrainwheels are not
substantial enoughSystem is unable to go into elevators, bathrooms, etc
1 3 3 Test ability to traverseRedesign transport
mechanismEthan, Mike &
Christina
10Failure to Maintain
StabilityInappropriate CG
locationDevice falls over 1 9 9
Test that device does not fall over under different
accelerations/speeds or environmental conditions
Add balancing weight to baseEthan, Mike &
Christina
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Technical Risk Assessment P15073: Autonomous IV Stand
# Risk Cause Effect L S I Action to Mitigate Action to Remediate Owner
11 Battery Dies Runs out Patient stranded 9 3 27Battery output testing to determine
effectiveness
Allow wheels to free spin for manual transportation and readout to inform users of
current level
Caitlin & Nick J.
12 Battery leaks Improper use/storage Mild irritation 1 1 1 Keep inside enclosure Allow for proper containment Caitlin & Nick J.
13Circuit shorts motors
onImproper power
distributionSystem makes irrational
movements1 9 9 Verify all circuit designs Wire properly Caitlin & Nick J.
14Circuit shorts motors
offImproper power
distributionSystem stops suddenly 3 9 27 Verify all circuit designs Wire properly Caitlin & Nick J.
15Electrical short hurts maintenance worker
System not disabled while inside enclosure
Minor electrical burn 1 3 3Have warning light when power is
onMake enclosure unopenable
while power is onCaitlin & Nick J.
16Frequencies interfere
with local systems
Frequencies are of that in current hospital
equipment
Wireless signals become corrupted
1 3 3Scan all frequencies output by
device
Check with hospital staff and ensure no matching
frequenciesCaitlin & Nick J.
17 Alarm failsImproper power
distributionPatient is unaware of issue 3 9 27 Verify all circuit designs Wire properly Caitlin & Nick J.
18 Bag sensor failsImproper power
distributionPatient and staff are
unaware of medical reqs.3 9 27 Verify all circuit designs Wire properly Caitlin & Nick J.
19Object avoidance
sensors failsAlgorithm makes error
System makes irrational movements
9 9 81 Verify code logicExtensively test algorithm
against worst case scenariosCaitlin & Nick J.
20Patient detection
system failsAlgorithm makes error
System makes irrational movements
9 9 81 Verify code logicExtensively test algorithm
against worst case scenariosCaitlin & Nick J.
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Test PlanP15073: Autonomous IV Stand
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Revised Project PlanP15073: Autonomous IV Stand
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System Design PhaseP15073: Autonomous IV Stand
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● Items That Were Revisitedo Customer/Engineering Requirementso Benchmarking
● Items Outside MSD Requirementso System Flow Diagramo Electrical Block Diagram
Expanded Deliverables
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● Items To Be Revisitedo RGH Contacto FDA Regulationso Budget
Expanded Deliverables
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Subsystem Design PhaseP15073: Autonomous IV Stand
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Questions?
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What We Want From The Audience
Is there anything that we are failing to consider?
Do you see any challenges with our design we have failed to observe?
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Thank You