Mike Allocco, Soham Chakraborty, Leslie Havens, Danielle Koch, Andrew Miller, Kristeen Yee, Stephanie Zambito TEAM 14026 – MSD I PRESENTATION P14026_Detailed Design Review 12/05/13
Transcript
Slide 1
Mike Allocco, Soham Chakraborty, Leslie Havens, Danielle Koch,
Andrew Miller, Kristeen Yee, Stephanie Zambito TEAM 14026 MSD I
PRESENTATION P14026_Detailed Design Review 12/05/13
Slide 2
Problem Statement Engineering Needs and Requirements Functional
Decomposition Week 6 System Design Current System Design Connection
to PEV Assist & CPR Mode Tubing Trachea Lung AGENDA Sensor
Placement Pressure Sensors Flow Sensors Bill of Materials Budget
Test Plan Risk Assessment Plan for MSD II P14026_Detailed Design
Review 12/05/13
Slide 3
Current State 1 st generation of a validation system Desired
State Simulate the respiratory system and measure flow, pressure,
volume, and oxygen concentration Project Goals/Opportunities
Collect data to evaluate 13027s PEV Constraints ANSI Z79.7 ISO
5469:1967 ASTM F1100-90 ISO 80601-2-12 PROBLEM STATEMENT
P14026_Detailed Design Review 12/05/13
Testing the LTV Connection to the MediResp-III Breathing into
the LTV WHY THE DESIGN CHANGED P14026_Detailed Design Review
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Slide 8
Breaths per Minute Breaths per Minute at 0.9 Lpb WHY THE DESIGN
CHANGED MediResp-IIILTV DisplayObserved 4.610017 74123
MediResp-IIILTV Display 4.626 735 1046 P14026_Detailed Design
Review 12/05/13
Slide 9
The LTV takes readings at the beginning and end of the tubing
Using the LTV would require the team to reverse engineer the LTV
Would be outside the time constraint of the project Potentially,
would be outside the budget constraint of the project WHY THE
DESIGN CHANGED P14026_Detailed Design Review 12/05/13
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CURRENT SYSTEM DESIGN P14026_Detailed Design Review
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CONNECTION TO PEV P14026_Detailed Design Review 12/05/13
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CURRENT SYSTEM DESIGN P14026_Detailed Design Review
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Slide 13
Actuation is an excellent way to make a process repeatable. The
rotational energy of a small motor would have to be converted to
linear pushing/pulling. An easy-to-execute choice was to use the
rack-and- pinion A lead screw was also considered, but these are
less efficient ASSIST MODE COMPONENTS P14026_Detailed Design Review
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Slide 14
The syringe is 150mL and we expect to move roughly 100mL at a
time, based on a typical inhalation. The rack part of the
rack-and-pinion must make a solid connection with the plunger
ASSIST MODE COMPONENTS 100 mL Dist = x P14026_Detailed Design
Review 12/05/13
Slide 15
The rack will need support to avoid slipping out of place. The
typical solution is to fit the rack into a short channel to
constrain its path. ASSIST MODE COMPONENTS Characteristics of the
Rack as Designed: 1)Keep rack on a level with the pinion. 2)Leave
space (0.01 in) on either side. 3)Fairly wide to allow for easier
connection to plunger of the syringe. P14026_Detailed Design Review
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Slide 16
THREE CARDINAL RULES OF GEAR DESIGN: Meshing gears must have
the same height, Distance between gears teeth (pitch) should be as
close to same as possible Different number of teeth is mechanically
advantageous for torque- to-turn ratio and for speed of rotation.
ASSIST MODE COMPONENTS P14026_Detailed Design Review 12/05/13
Slide 17
ASSIST MODE COMPONENTS -35-45 HR -Pressure Angle 20deg
-Circular Pitch 2mm -300mm Long -Pressure Angle 20deg -Circular
Pitch 2mm -Bore Size to Order -23 Teeth SH2MS2B250F7ARM-2M-300
P14026_Detailed Design Review 12/05/13
Slide 18
The gear connection to the stepper motor relies on the motors
default pin being able to find purchase in the gear bore. The round
pin of the motor is 5mm. We expect to order the gear at a NEMA#23
single-flat bore type. ASSIST MODE COMPONENTS P14026_Detailed
Design Review 12/05/13
Slide 19
SIZING OF THE STEPPER MOTOR The maximum expected resistance to
motion is a volume of 100mL of air. We would like to be able to
apply the pressure of roughly half a breath (17 cmH2O or 1.667 kPa)
We would like a fairly quick reaction time of 0.2 sec. Recall that
Work/Time is Power, so analysis yielded: Moreover, stepper motors
are roughly 50% efficient, so the stepper motor selected was sized
at 2 Watts of power. The stepper motor is also bidirectional to
allow for retraction. ASSIST MODE COMPONENTS P14026_Detailed Design
Review 12/05/13
Slide 20
Originally, the team planned on using the syringe, stepper
motor, and actuation to simulate a patient receiving compressions
At first team 13027 counted compressions by sensing pressure Team
13027 has narrowed the scope of their project CPR MODE
P14026_Detailed Design Review 12/05/13
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CURRENT SYSTEM DESIGN P14026_Detailed Design Review
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TUBING P14026_Detailed Design Review 12/05/13
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CURRENT SYSTEM DESIGN P14026_Detailed Design Review
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TSI 4000 Series Flow Meter Flow Measurement: Accuracy +/- 2% of
reading Range 0.01-99.9L Response: 4ms Pressure Measurement:
Accuracy +/- 1 kPa Range 50-199kPa Computer Cable (mini-DIN to 9
pin D-Sub) allows interface between device and computer. Outcome:
Data logging for flow and volume measurements *Note same device
used by 13027 to calibrate MediResp-IV FLOW METER P14026_Detailed
Design Review 12/05/13
Slide 37
Tested Mike exhalation of breath Connected tubing to flow meter
Read in real time data PRELIMINARY FLOW TESTING P14026_Detailed
Design Review 12/05/13
4320T15 Miniature PVDF Relief Valve Temp. Range: 26 F to 255 F
Use with air Relieve excess pressure in air lines Valve body is
PVDF Seal is Buna-N RELEASE VALVE P14026_Detailed Design Review
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CURRENT SYSTEM DESIGN P14026_Detailed Design Review
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EMANT300 LOW COST USB 24 DAQ MODULE Up to 6 channels of
differential multiplexed ADC Single channel 22 bit @ 10 samples/sec
Single channel 16 bit waveform @ 2500 samples/sec 1 channel of
8-bit D/A conversion 8 digital IO channels One 16-bit
general-purpose counter or 16-bit PWM USB connection 25 pin D-Sub
connects to physical world Application adaptors with instructional
guides LabView compatible Cost = $99.00
http://www.emant.com/251004.page P14026_Detailed Design Review
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PCB LAYOUT P14026_Detailed Design Review 12/05/13
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BILL OF MATERIALS Purchasing Req #Part NamePart
NumberVendorQuantity, Amount 1PVC Tubing6.11942E+11Home Depot 1, 10
ft, 1/2 inch diameter 2SyringeSYRMJ140LLsyringepump.com1, 140 mL
3Stepper MotorSTP-MTR-17040automationdirect.com1, 2 W 4ComputerDell
Precision T1700Dell1, use lab computer 5Pressure
Sensor987-sm5470-015-g-bmouser.com2, 0-1.5 psi 6TSI Mass Flowmeter
40401980339, Rev GTSI1, 0-300 Std L/min 7Aluminium
Sheet53538520052hardwareandtools.com1 8Bolts TBHS 104
monsterfastener.com4 9O-RingsAS568-021oringsonline.com2 10PVC
Flanges854-005zorotools.com2 11PVC Cement/Primer
kitKT1010spadepot.com1 12Valve (release, ball)4320T15 1, 1 psi
13Rack+Pinion GearsKWGDLqtcgears.com1 14DAQ Board EMANT300 USB 24
bit DAQ ModuleEMANT1, 15LabView 1, use lab computer 16Siemen
Lung6006832Medical Support Products1, have 17PVC
CaulkT9AB598814globalindustrial.com1, 10.3 oz. 18 Computer Cable
(mini-DIN to 9-bin D-Sub)1303583TSI1 19RS232 Serial Command Set
Manual1980340TSI1 20D-sub 25 Socket1125FEA-NDdigikey.com1 21Op-Amp
(buffer)512-KA2904DTFmouser.com2 22PCB oshpark.com3 23 CKD Series
PVC Check Valve for low pressureCKD050V-PVPlast-O-Matic
(amazon.com)1 P14026_Detailed Design Review 12/05/13
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BUDGET Purchasing Req #Part Name Sub Total Shipping Total Price
1PVC Tubing$5.70$0.00$5.70 2Syringe$4.95 3Stepper
Motor$18.00$6.00$24.00 4Computer$779.00$0.00 5Pressure
Sensor$30.08$6.99$37.07 6TSI Mass Flowmeter 4040$925.00$0.00
7Aluminium Sheet$13.80$7.29$21.09 8Bolts$1.40$0.00$1.40
9O-Rings$7.36$7.50$14.86 10PVC Flanges$9.80$5.79$15.59 11PVC
Cement/Primer kit$9.95$3.95$13.90 12Valve (release, ball)$27.78
13Rack+Pinion Gears$40.00$5.00$45.00 14DAQ Board$99.00
15LabView$500.00$0.00 16Siemen Lung$199.00$0.00 17PVC
Caulk$12.75$5.00$17.75 18Computer Cable (mini-DIN to 9-bin
D-Sub)$45.00$0.00 19RS232 Serial Command Set Manual$0.00 20D-sub 25
Socket$5.33 21Op-Amp (buffer)$1.14$6.99$8.13 22PCB$25.00$0.00$25.00
23CKD Series PVC Check Valve for low pressure$36.91$0.00$36.91
$2,796.95$403.46 P14026_Detailed Design Review 12/05/13
Slide 46
Leak Test Test sequentially over build of assembly using flow
meter If lose 1% of flow, then look into forming better seals
Calibration Test of Pressure Sensors Use manometer to validate
pressure sensors If within 5% of the sensor, then proceed
Calibration Test of Flow Meter Use validated pressure sensors over
a known distance to validate flow meter Take into account the
discrepancy between analytical and experimental values Timing of
Actuation Use stopwatch or switch to time and validate actuation is
working as expected See mitigation plan (in future slide) TEST PLAN
FOR OUR SYSTEM P14026_Detailed Design Review 12/05/13
RISK ASSESSMENT Failure ModeTriggerMitigation PlanOwner Failure
of communication between electrical and mechanical system (1)
System is unable to record or store data Problemshoot the
connections between sensors and electrical system. Mike, Stephanie
Software errors (i.e. compilation errors, run time error, inputs do
not match outputs) (1) Receive errors from the computer, (2) data
does not make sense with the given inputs Check code and logic
behind the code. Look up the error that the software is returning.
Mike Actuation failure(1) If during week 8 actuation is still a
high concern of the team, (2) expert advice is to disregard
actuation Change team focus to manually moving the syringe in
standardized fashion. Leave actuation of the syringe as future work
for a future team. Danielle Failure to measure outputs accurately
(1) Data is inconsistent, (2) data does not make sense Check
programming, sensors and follow test plan. If failure mode
continues, seek expert advice to see where system is failing.
Leslie Poor/ineffective communication between team members (1)
group member complains, (2) a group member shows no improvement in
the next phase after receiving a bad peer review Team Lead will
talk to the team member or team members to discuss what changes
must occur. If failure mode continues the team will talk to the
guide. Kris P14026_Detailed Design Review 12/05/13
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PLAN FOR MSD II P14026_Detailed Design Review 12/05/13
MATH BEHIND COMPLIANCE PROGRAM Control Pointxy P000
P12.25064485746.93264 P20.3065969391203.165 P34.8606556762243.364
P44.454849913-257.988 P560 Point 100 Point 21.85700 Point 32.851000
Point 44850 Point 55300 Point 660 P14026_Detailed Design Review
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Slide 54
Corrugated pipe can be assumed smooth at corrugation heights
and wavelengths much less than pipe radius. Instabilities of Flow
in Corrugated Pipes - Tao SMOOTH PIPE ASSUMPTION P14026_Detailed
Design Review 12/05/13