Team 14026 – MSD I Presentationedge.rit.edu/edge/P14026/public/12_5_2013 Detailed Design...Mike Allocco, Soham Chakraborty, Leslie Havens, Danielle Koch, Andrew Miller, Kristeen

Mike Al locco, Soham Chakrabor ty, Lesl ie Havens, Daniel le Koch, Andrew Mi l ler, Kr isteen Yee, Stephanie Zambito

TEAM 14026 – MSD I

PRESENTATION

P14026_Detailed Design Review 12/05/13

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

Bil l of Materials

Budget

Test Plan

Risk Assessment

Plan for MSD II


Current State

1st 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 13027’s PEV

Constraints

ANSI Z79.7

ISO 5469:1967

ASTM F1100-90

ISO 80601-2-12

PROBLEM STATEMENT


MATRIX


FUNCTIONAL DECOMPOSITION


DESIGN PROPOSED WEEK 9


Testing the LTV

Connection to the MediResp-III

Breathing into the LTV

WHY THE DESIGN CHANGED


Breaths per Minute

Breaths per Minute at 0.9 Lpb


MediResp-III LTV Display Observed

4.6 100 17

7 41 23

MediResp-III LTV Display

4.6 26

7 35

10 46


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



CURRENT SYSTEM DESIGN


CONNECTION TO PEV




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


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


100 mL

Dist = x


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.


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.


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.




-35-45 HR

-Pressure Angle 20deg

-Circular Pitch 2mm

-300mm Long

-Pressure Angle 20deg

-Circular Pitch 2mm

-Bore Size to Order

-23 Teeth

SH2MS2B250F7A RM-2M-300


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.



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.



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




Why PVC?

PVC has many standard sizes and variations for connections.

Will be easier to implement.

PVC has smooth Inner Diameter walls.

Turbulent Vs. Laminar Flow?

If Re<2300 then we can assume flow is laminar:

𝑅𝑒 =ρ𝑉𝐷

μ, for air at STP: ρ = 1.205

𝑘𝑔

𝑚3 , and μ = 1.983 ∗ 10−5𝑃𝑎 ∗ 𝑠𝑒𝑐

Where 𝑄𝑚𝑎𝑥 = 32 Lpm, 𝐴𝑝𝑖𝑝𝑒 = Π(𝑑

2)2 & 𝑄 = 𝑉𝐴, 𝑉𝑚𝑎𝑥 = 0.027

𝑚

𝑠,

𝑅𝑒𝑚𝑎𝑥 =1.205∗.027∗.0127

1.983∗10−5 = 20.83

20.83<<2300 therefore we can easily assume flow is laminar.

TUBING




Airway Resistance Basics

𝑅𝑒𝑠𝑖𝑠𝑡𝑎𝑛𝑐𝑒 ≡Δ𝑃

𝑄 [

𝑐𝑚𝐻2𝑂𝐿

𝑆𝑒𝑐

] (1)

Orifice Plate Feasibi l i ty

ṁ =𝐴2

1−(𝐴2𝐴1

)22ρΔ𝑃 (2)

plugging in ρQ=ṁ and solving for 𝐴2 results in,

𝐴2 =(ρ𝑄)2

2ρΔ𝑃+(ρ𝑄)2(1

𝐴1)2

where ΔP comes from Equation (1) (3)

Which results in orifice plate diameters as follows:

These orifice plate ΔPs will need to be validated; diameters may need to be adjusted based on empirical correction factors and experimental results.

TRACHEA RESISTANCE

Target Resistance

(cmH2O/L/Sec) d UB flow (mm) d LB flow (mm) davg (mm)

5 5.652 4.258 4.955

25 3.81 2.854 3.332

50 3.207 2.401 2.804

100 2.697 2.019 2.358

150 2.438 1.825 2.1315

200 2.27 1.698 1.984


TRACHEA RESISTANCE CONT’D.




How can we vary lung compliance with only one test lung?

Add a weight

Use a rubber band

LUNG COMPLIANCE


Bezier Curves are splines that are controlled through the

manipulation of control points

BEZIER CURVES


BEZIER ANIMATION


Uses Bezier curves to model an ideal breath curve and

generate simulated data based on this curve

We “force” the program to generate a curve that we want and

use it to predict how dif ferent factors will af fect our results

5 th degree Bezier Curve gives more control

(1 − 𝑡 ) 5 𝑃0 + 5 (1 − 𝑡 ) 4 𝑡 𝑃1 + 1 0(1 − 𝑡 ) 3 𝑡 2 𝑃2 + 1 0(1 − 𝑡 ) 2 𝑡 3 𝑃3 + 5 (1 − 𝑡 )𝑡 4 𝑃4 + 𝑡 5 𝑃5

This equation gives an x or y value for a specific t value.

0≤t≤1

Rearranging the equation allows us to get control points from

given coordinates.

Gives us a useful estimation of data

COMPLIANCE PROGRAM


COMPARISON TO REAL DATA




SENSOR PLACEMENT


SM5470 -Product of Silicon Microstructures Incorporated

Low Pressure Scale 0-3 PSI

Gauge Pressure Sensor

Accuracy is .25%

Used within Medical Instrumentation and Monitoring

PRESSURE READING


SENSOR PLACEMENT


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


Tested Mike exhalation of breath

Connected tubing to flow meter

Read in real time data

PRELIMINARY FLOW TESTING


SENSOR PLACEMENT


4320T15 Miniature PVDF Relief Valve

Temp. Range: 26F to 255F

Use with air

Relieve excess pressure in air lines

Valve body is PVDF

Seal is Buna-N

RELEASE VALVE




ELECTRICAL SCHEMATIC


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


http://www.emant.com/251004.page

PCB LAYOUT


BILL OF MATERIALS

Purchasing Req # Part Name Part Number Vendor Quantity, Amount

1 PVC Tubing 6.11942E+11 Home Depot

1, 10 ft, 1/2 inch

diameter

2 Syringe SYRMJ140LL syringepump.com 1, 140 mL

3 Stepper Motor STP-MTR-17040 automationdirect.com 1, 2 W

4 Computer Dell Precision T1700 Dell 1, use lab computer

5 Pressure Sensor 987-sm5470-015-g-b mouser.com 2, 0-1.5 psi

6 TSI Mass Flowmeter 4040 1980339, Rev G TSI 1, 0-300 Std L/min

7 Aluminium Sheet 53538520052 hardwareandtools.com 1

8 Bolts TBHS-104 monsterfastener.com 4

9 O-Rings AS568-021 oringsonline.com 2

10 PVC Flanges 854-005 zorotools.com 2

11 PVC Cement/Primer kit KT1010 spadepot.com 1

12 Valve (release, ball) 4320T15 1, 1 psi

13 Rack+Pinion Gears KWGDL qtcgears.com 1

14 DAQ Board

EMANT300 USB 24 bit

DAQ Module EMANT 1,

15 LabView 1, use lab computer

16 Siemen Lung 6006832 Medical Support Products 1, have

17 PVC Caulk T9AB598814 globalindustrial.com 1, 10.3 oz.

18

Computer Cable (mini-DIN to 9-bin

D-Sub) 1303583 TSI 1

19 RS232 Serial Command Set Manual 1980340 TSI 1

20 D-sub 25 Socket 1125FEA-ND digikey.com 1

21 Op-Amp (buffer) 512-KA2904DTF mouser.com 2

22 PCB oshpark.com 3

23

CKD Series PVC Check Valve for

low pressure CKD050V-PV Plast-O-Matic (amazon.com) 1


BUDGET

Purchasing Req

# Part Name Sub Total Shipping Total Price

1 PVC Tubing $5.70 $0.00 $5.70

2 Syringe $4.95 $4.95

3 Stepper Motor $18.00 $6.00 $24.00

4 Computer $779.00 $0.00 $0.00

5 Pressure Sensor $30.08 $6.99 $37.07

6 TSI Mass Flowmeter 4040 $925.00 $0.00 $0.00

7 Aluminium Sheet $13.80 $7.29 $21.09

8 Bolts $1.40 $0.00 $1.40

9 O-Rings $7.36 $7.50 $14.86

10 PVC Flanges $9.80 $5.79 $15.59

11 PVC Cement/Primer kit $9.95 $3.95 $13.90

12 Valve (release, ball) $27.78 $27.78

13 Rack+Pinion Gears $40.00 $5.00 $45.00

14 DAQ Board $99.00 $99.00

15 LabView $500.00 $0.00 $0.00

16 Siemen Lung $199.00 $0.00 $0.00

17 PVC Caulk $12.75 $5.00 $17.75

18 Computer Cable (mini-DIN to 9-bin D-Sub) $45.00 $0.00 $0.00

19 RS232 Serial Command Set Manual $0.00 $0.00 $0.00

20 D-sub 25 Socket $5.33 $5.33

21 Op-Amp (buffer) $1.14 $6.99 $8.13

22 PCB $25.00 $0.00 $25.00

23 CKD Series PVC Check Valve for low pressure $36.91 $0.00 $36.91

$2,796.95 $403.46


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


RISK ASSESSMENT


RISK ASSESSMENT


RISK ASSESSMENT

Failure Mode Trigger Mitigation Plan Owner 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


PLAN FOR MSD II


QUESTIONS?


BACK-UP SLIDES


First and last points given to the program wil l be the “anchors” for the spl ine, P0 and P5.

Solve for the rest of the handles using

matrices

1

𝑑𝑒𝑡𝑒𝑟𝑚

𝐴 𝐵 𝐶 𝐷𝐸 𝐹 𝐺 𝐻𝐼 𝐽 𝐾 𝐿

𝑀 𝑁 𝑂 𝑃

𝑒𝑓𝑔ℎ

=

𝑃1𝑃2𝑃3𝑃4

Where c,d,e and f are the other four given points and A through P are the terms from the original equation

MATH BEHIND COMPLIANCE PROGRAM

Control Point x y

P0 0 0

P1 2.250644857 46.93264

P2 0.306596939 1203.165

P3 4.860655676 2243.364

P4 4.454849913 -257.988

P5 6 0

Point 1 0 0

Point 2 1.85 700

Point 3 2.85 1000

Point 4 4 850

Point 5 5 300

Point 6 6 0


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


Documents

Team 14026 – MSD I Presentationedge.rit.edu/edge/P14026/public/12_5_2013 Detailed Design...Mike Allocco, Soham Chakraborty, Leslie Havens, Danielle Koch, Andrew Miller, Kristeen