p14471 vibration testing apparatus ii -...
TRANSCRIPT
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P14471 Vibration Testing Apparatus II Detailed Design Review
12/10/2013
Brett Billings
Jacob Gardner
Nick Greco
Ron Jimbo
Claire Kobal
Ryan Selig
Ashley Waldron
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Agenda Project Summary
Selected Design
Preliminary Analysis
Frame
Motor
Electrical / Control System
Safety
Improvements from P13471
Test Plan
BOM
Project Plan
Concerns/Issues
Appendix
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Project Summary
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Problem Statement
Update company’s vibration test apparatus Meet UL 844 Standard
Continue progress started by Team 13471
Done: the eccentric drive mechanism
Still needs:
Frame
Motor
Control system
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House of Quality Engineering Metrics
Customer Requirements
Cus
tom
er W
eigh
ts
Dis
plac
emen
t of
lum
inai
re
Vib
rati
on o
f lu
min
aire
Dur
atio
n of
vib
rati
on t
est
Low
sou
nd
Mac
hine
won
't o
pera
te if
mov
ing
part
s ar
e ex
pose
d
Com
plet
ely
stop
mac
hine
wit
h
Em
erge
ncy
Stop
Min
imiz
e pi
nch
poin
ts
Min
imiz
e nu
mbe
r of
ope
rato
rs
Vol
tage
of
mot
or
Mou
nt p
enda
nt c
onfi
gura
tion
Mou
nt s
tanc
hion
con
figu
rati
on
Mou
nt y
oke
conf
igur
atio
n
Mou
nt t
runn
ion
conf
igur
atio
n V
isua
lly
disp
lay
sett
ings
and
sta
tus
of
test
Ope
rati
on d
ocum
enta
tion
Step
s re
quir
ed f
or S
et-u
p
Isol
ate
mot
or f
rom
oil
spi
lls
Mai
nten
ance
doc
umen
tati
on
Max
wei
ght
of m
ount
ed l
umin
aire
Tot
al m
ater
ials
cos
t
Tim
e to
Set
up
Mac
hine
foo
tpri
nt
Adherence to UL844 testing standard 5 5 5 5
Apparatus is safe 5 3 5 5 3 3 1
Motor must be compatible with available voltage 5 5 3 3
Ability to test multiple configurations 3 5 5 5 5 1 1 1
Easy to use 3 5 1 3 3 1 3
Easy to maintain 2 3 1 5 3
Visually display test information/feedback to
operator 3 3 3 3 5 1 1 1 1
Ability to test a range of luminaire weights 4 5 5 5 5 1 1 1 5
Cost under $4000 3 5
Long service life 4 1 1 5 3 1
Similar dimensions to existing machine 1 5
Technical Targets (Specifications)
1/32
in.
2000
cyc
les/
min
35 h
ours
< 8
5 dB
A
yes
< 1
0 se
cond
s
< 3
≤ 2
< 2
40 V
AC
Yes
Yes
Yes
Yes
Yes
80%
via
sur
vey
(eas
y to
foll
ow)
< 1
0 st
eps
Yes
80%
via
sur
vey
(eas
y to
foll
ow)
> 1
50 l
bs
< $
4000
< 1
20 s
econ
ds
< 3
4X48
in2
Raw score
69
69
69
15
25
25
15
21
25
35 7 7 7 18
33
16
45
44
20
15
16 5
Relative
Weight
11%
11%
11%
2%
4%
4%
2%
3%
4%
6%
1%
1%
1%
3%
5%
3%
7%
7%
3%
2%
3%
1%
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Engineering Requirements Number Requirement
Raw
Score Units
Ideal
Measure 1 Displacement of luminaire 69 in 1/32
2 Vibration of luminaire 69 cycles/min 2000
3 Duration of vibration test 69 hours 35
4 Isolate motor from oil spills 45 Binary Yes
5 Maintenance Documentation 44 Survey (easy to follow) 80%
6 Mount pendant configuration 35 Binary Yes
7 Operation Documentation 33 Survey (easy to follow) 80%
8 Machine won't operate if crankshaft enclosure is open 25 Binary Yes
9 Completely stop machine with Emergency Stop 25 seconds < 10
10 Maximum voltage of Motor 25 V AC 240
11 Minimize number of operators 21 people 2
12 Max weight of mounted luminaire 20 lbs > 150
13 Visually display settings and status of test 18 Binary Yes
14 Steps to set up 16 steps < 10
15 Setup Time 16 seconds < 120
16 Low Sound 15 dBA < 85
17 Minimize pinch points 15 Count < 3
18 Total materials cost 15 $ < 4,000
19 Mount stanchion configuration 7 Binary Yes
20 Mount yoke configuration 7 Binary Yes
21 Mount trunnion configuration 7 Binary Yes
22 Machine footprint 5 in2 < 34X48
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Selected Design
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Selected Design
Interchangeable Conduits
Motor with V-belt
VFD
Digital Dial Gauge
Encoder
LCD, Microcontroller
Polycarbonate Guards
E-stop
Paint for Rust Protection
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Preliminary Analysis
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Maintaining Displacement ER #1: Displacement must be 1/32’’
Clamping force: Provided by 2 x A574 screws - 5/8’’-11 M = torque on screws = 168.9 M ft-1
Frictional force: 2 possible locations: = 33.8 M ft-1 (worst case)
Maximum force applied: 1.68 ft-lbs. (motor) at 1/32’’ = 645 lbs.
Required screw torque: = 38 ft-lbs. (Safety factor of 2) Max recommended A574 torque = 220 ft-lbs
*Detailed calculations in Appendix
1 2
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Engineering Analysis: Forces
ER # 12 – Maximum Luminaire Weight
Force on collar/conduit = 1641.3N (368.979lbf)
Force from connecting rod = 2822.68N (634.564lbf)
Calculated friction forces
Worst case = 297.68N (66.921 lbf)
Torque on connecting rod = 2.13667Nm (1.575 lbft)
Torque on block = 2.399Nm (1.769 lb ft)
Torque on crankshaft = 2.399Nm(1.769 lb ft)
*Refer to Appendix
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Engineering Analysis: Fatigue
Conduit
σa =15456.9psi so σm =0psi
σa < 0.5*σ0
Therefore Infinite Life
Factor of Safety
σar =15,5229psi < 0.5*σ0
Infinite life
C-Channel
Max stress = 7181.27psi = σa
σa < 0.5*σ0
Infinite Life
Refer to appendix
σ0 =35,000psi; σu =58,000psi
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Engineering Analysis: Fatigue/Buckling
Extension Rod:
Buckling:
Pcr = 4576.61lbf
368.9 lbf < 4576.61lbf
No buckling
Fatigue:
σa =469.698psi
σa < 0.5*σ0
Infinite Life
Threaded Connector
Buckling:
Pcr = 13800.8lbf
368.9 lbf < 13800.8lbf
No buckling
Fatigue:
σa =2855.26psi
σa < 0.5*σ0
Infinite Life
• Refer to appendix
σ0 =35,000psi; σu =58,000psi
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Frame
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Final Frame Design
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Frame Halve Views
Front and Back Views of
Full Assembly
Front and Back
Views of Crankshaft
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Analysis Overview ER # 2, 3 – Vibration of Luminaire, Test Duration
ER # 12 – Maximum Luminaire Weight
ER # 22 – Machine Footprint
Tested both modal and harmonic response of frame using ANSYS Workbench
Simplified system to incorporate the respective weights of each system but not the complexity (bolt holes, threads, etc.)
Initially tested using a displacement of 0.015625” at the collar. This yielded:
𝜎𝑉𝑀 = 3749.2 𝑝𝑠𝑖 and 𝛿𝑥 = 0.017024 𝑖𝑛
Tested using lower displacements and achieved a good result with a displacement of 0.0144” at the collar. This yielded:
𝜎𝑉𝑀 = 3455.3 𝑝𝑠𝑖 and 𝛿𝑥 = 0.015689 𝑖𝑛
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Frame Analysis at 0.015625 in.
Displacement
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Frame Analysis at 0.0144 in.
Displacement
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Motor
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Motor Selection
Maximum Load= 150 lbs
Torque Necessary= 1.68 ft-lbs
We will be running the motor at full load torque to allow for a longer life.
𝐺𝑒𝑎𝑟 𝑅𝑎𝑡𝑖𝑜 =𝑖𝑛𝑝𝑢𝑡 𝑠𝑝𝑒𝑒𝑑
𝑜𝑢𝑡𝑝𝑢𝑡 𝑠𝑝𝑒𝑒𝑑=
3500
2000= 1.75
With the v-drive offset, the motor can produce less torque than needed by the crankshaft system.
ER #2 – Vibration of Luminaire
ER #10 – Max Motor Voltage
ER #12 – Maximum Luminaire Weight
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Motor Performance Data:
Baldor M3545
Updated cost from Volland Electric
Equipment Corp: $237.51
*This is a saving of almost $235.00 from
the original estimate
We chose a 1 HP motor with
a full-load torque of 1.5 LB-FT
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V-Drive Selection
All information was gathered from the Dodge catalog
For the given gear ratio of 1.75, Type A, 1-Groove
Driver Datum Diameter: 3.4”
Outer Diameter= 3.4”+.37”= Approx. 3.75”
Driven Datum Diameter: 6.2”
Outer Diameter= 6.2”+.37”= Approx. 6.55”
Driver Taper Lock Bushing (1210), .5” Shaft Diameter
Driven Taper Lock Bushing (1610), 1” Shaft Diameter
Distance from center shaft to center shaft using donated belt guard: 9.5”
*Unable to locate actual Dodge belt. A very similar belt will be purchased through AutoZone.
ER #2 – Vibration of Luminaire
ER #4 – Isolate Motor from Oil Spills
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Motor Mount to Frame
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Encoder Placement
The current shaft has to be machined down to a smaller size at the very
end to add a coupling for the encoder.
*Encoder to be discussed further in electrical systems 26
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Electrical / Control System
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Component Placement at CCH
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Flow Diagram
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Power Connection Schematic
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Power Supply
VGS-25-5
25 Watt 5V AC-DC converter
5A max delivered current
3.1 x 1.11 x 2.03 inches
*Refer to appendix for power calculations 31
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Encoder TRD-N1024-RZWD
ER #2 – Vibration of Luminaire
ER #13 – Display System Status
Resolution: 1024 Pulses Per Revolution (PPR)
Max frequency: 100 kHz
Max RPM detection: 100 kHz / 1024 PPR * 60 = 5859
RPM
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ER # 10 – Max voltage of Motor
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Enclosure
AMP1426CCLF
Polycarbonate enclosure with metal
snap latch
14 x 12 x 6 inches
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Control System Pseudo Code Initial delay to allow sufficient startup time for motor
Repeat (loop) the following until Timer_A value reads 35 hrs
Wait for appropriate delay time to avoid overworking MCU CPU
Use Timer_A capture from pin 11 of MCU to retrieve digital encoder signal
Read and store timer value upon rising edge of signal into var "A"
Read and store timer value upon next rising edge into var "B"
Period = B - A
Frequency = 1 / Period
Resolution = 1024
Speed of vibration in RPM = Frequency / Resolution * 60
; Dimensions = (rev / min) = (pulses/sec) / (pulses/rev) * (60 sec/min)
Send RPM and elapsed time (also from Timer_A) to LCD display via pinouts
if RPM exists above safety threshold (2000 RPM + threshold)
exit loop with error code set high
Update VFD with new RPM information to step up or down accordingly
Send signal to alert VFD to bring motor to a complete stop
if error code set high
Write "Test Ended Abruptly: High RPM" to LCD display
else
Write "Test Completed Successfully" to LCD display
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Launchpad and Display Encasing
ER # 3 – Duration of Vibration Test
ER #13 – Display System Status
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Safety
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Polycarbonate Guards ER # 8 – Crankshaft Enclosure is Guarded
ER # 17 – Minimize Pinch Points
Top and rear guard Clear, Polycarbonate ½’’ Excellent impact resistance Warning labels Replace existing top guard
Move mounting holes away from edge
Increases strength, but slight overhang
Modify rear guard Add access hole to decrease setup time
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Belt Guard
ER # 17 – Minimize Pinch Points
Protects operator from 2000 RPM belt
Donated
Modifications required:
Convert to “split” type
Weld existing halves together
Cut guard in half in other direction
Change existing mounting brackets
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Lock Out, E-stop
ER # 8 – Crankshaft Enclosure is Guarded
Lock out during maintenance
On electrical box, after power is isolated
Lock out procedure to be written in MSDII
ER # 9 – Completely Stop Machine with E-Stop
E-stop
Located on machine
Manually cuts power immediately
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Engineering Analysis: Sound
ER # 16 – Low Sound
Hearing Protection / Engineering Intervention To be determined in MSD II with Test Plan
Based on sound “dosage”
Dosage Calculation: L = dBA Sound Level
T = 8 hour exposure limit
C = actual exposure hours D = 100 * (C1/T1 + C2/T2 + C3/T3 +…)
D > 50% requires hearing protection
D > 80% requires engineering intervention
https://www.osha.gov/pls/oshaweb/owadisp.show_document?p_table=STANDARDS&p_id=9736
http://www.industrialnoisecontrol.com/comparative-noise-examples.htm
http://www.coopersafety.com/noisereduction.aspx
Maximum 8 Hour Exposure:
dbA hours Comparison
40 8192 Library
50 2048 Conversation at home
60 512 Conversation at restaurant
70 128 Radio or TV
80 32 Average Factory
85 16 Hearing protection required
90 8 Blender
100 2 Motorcycle
110 0.5 Live Rock Music = Pain Threshold
120 0.125 Thunderclap
130 0.03125
140 0.0078125
150 0.001953125 Jet Take-Off (25m) = Eardrum Rupture
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Safety Checklist ER # 8 – Machine Guarding
ER # 9 – Emergency Stop
ER # 16 – Low Sound
Item Safety Item Yes No N/A Owner Due Date
1 Is lockout/tagout procedure posted?
2 Can all energy sources be locked out? (electrical, air, hydraulic, water, etc.)
3 Are all electrical devices labeled with voltage and power source?
4 Are all machine controls labeled?
5 Are all machine hazards adequate guarded to prevent bodily contact? (motion, heat, light, ejection, etc.)
6 Do machine interlocks/light curtains inhibit motion?
7 Are E-Stops located at all operator stations?
8 Are utilities routed to avoid trip hazards?
9 Have any potential waste materials been identified? Do they have a disposal procedure?
10 Is there adequate egress from area?
11 Is a fire extinguisher located within 75 ft?
12 Is there adequate access for all operations? (maintenance, setups, operation, etc.)
13 Is machine designed to minimize overhead and extended reaching, pulling, bending, and twisting?
14 Is all required training complete and documented? (LOTO, maintenance, setup, operation, etc.)
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Improvements from P13471
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Setup Improvements ER # 11 – Minimize number of operators
ER # 14 – Steps to set up
ER # 15 – Setup time
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Setup Improvements Current setup procedure:
1. Measure displacement with dial gauge
2. Lockout machine
3. Remove top guard (8 screws)
4. Remove rear guard (4 screws)
5. Remove collars (2)
6. Remove connecting rod (plate)
7. Loosen locking bolts (2)
8. Adjust set screw
9. Perform 2-7 in reverse
10. Repeat 1-9 until 1/32’’ reached ~ 5x
Approximately 60 minutes to setup
10 minutes
2x
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Setup Improvements
Displacement adjustment without removing rear guard,
collars, or connecting rod (plate)
Also, U-bolt prevents block from rotating
Changes required:
Add 2 access holes to connecting rod (plate)
Add 4 holes total for u-bolt
Add 1 access hole to rear guard
Doesn’t impact safety, .2’’
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Stress and Deformation Analysis of
Connecting Rod
47
Maximum Stress Situation: Fixed support on flat edge, 900 lbs added in either tension
or compression along edge with cut-out.
Equivalent Stress Max (Left): 4117.4 psi
Compare to yield of structural steel: ~36,000 psi
Maximum Deformation (Right): .00045 inches
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Setup Improvements
Finer set screw
Before:
11 threads per inch
1 turn = 290% of displacement!
After:
100 threads per inch
1 turn = 33% of displacement
Changes required:
Machine new set screw plate
Requires threaded bushing for set screw
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Set Up Improvements
• Set screw
• Account for excess space
between conduit and collar
• Flange
• Dimensioned to be
placed in same location
every time
• Blocks on the C channel
Flange
Collar –
crankshaft
connection
Collar – set
screws
ER # 11 – Minimize number of operators
ER # 6, 19-21 – Mount 4 configuration types
ER # 13, 14 – Setup time, number of steps
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Test Plan
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Test Plan
Displacement Test
Date Completed: ______________________
Performed By: _______________________________
Engr. Spec.
# Specification (description)
Unit of
Measure
Marginal
Value Tolerance Comments/Status
1 The total displacement of the
Luminaire must be 1/32" inches 1/32 +/- 2%
1,2 The adjustment screws must be
tightened to the proper torque ft-lbs >=38 -
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Test Plan
Vibration Test
Date Completed: ______________________
Performed By: _______________________________
Engr. Spec.
# Specification (description)
Unit of
Measure
Marginal
Value Tolerance Comments/Status
2 Vibration of Luminaire must be
2000 rpm rpm 2000 +/- 2%
13 Vibration measurement is sent
back to the display binary Yes -
12 Apparatus will sufficiently vibrate
a large weight luminaire lb >=150 -
3 Vibrates for 35 hours hours >=35 -
10 Motor power is sufficient to fully
run the test hp >=1 -
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Test Plan
Dimensional Test
Date Completed: ______________________
Performed By: _______________________________
Engr. Spec. # Specification (description) Unit of Measure
Marginal
Value Comments/Status
11 Conduits fit the frame binary Yes
22 Footprint difference compared to old
apparatus ft^2 <=2
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Test Plan
Configuration Test
Date Completed: ______________________
Performed By: _______________________________
Engr. Spec. # Specification (description) Unit of Measure
Marginal
Value Comments/Status
6 Apparatus works while pendant mounted binary Yes
19 Apparatus works while stanchion
mounted binary Yes
20 Apparatus works while yoke mounted binary Yes
21 Apparatus works while trunnion
mounted binary Yes
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Test Plan
Ease of Use Test
Date Completed: ______________________
Performed By: _______________________________
Engr. Spec.
# Specification (description)
Unit of
Measure
Marginal
Value Tolerance Comments/Status
13 Display shows rpms and
running time binary Yes
14,15 Closed loop feedback keeps
rpms in check rpm 2000
+/- 2%
11,14,15 Survey given says apparatus is
easy to operate % >=80
4 Motor is isolated from oil spills binary Yes
5 Survey given says apparatus is
easy to maintain % >80
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Test Plan
Safety Test
Date Completed: ______________________
Performed By: _______________________________
Engr.
Spec. #
Specification
(description)
Unit of
Measure
Marginal
Value Comments/Status
8 Machine will not run during
LOTO binary Yes
17 Pinch points are covered # exposed 0
16 Noise is below 85 decibels dB <=85
9 Emergency Stop cuts all power
to the apparatus binary Yes
7 Complete Safety Checklist # fail 0 56
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Bill of Materials
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Bill of Materials ER # 18 – Total cost <= $4,000
Total Overall Price:
$2,564.59 58
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Project Planning
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Engineering Requirements to be
addressed in MSDII
60
ER # 5 – Maintenance Documentation
ER # 7 – Operation Documentation
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Completed Action Items from DDRs
Update CAD drawings for machine shop
Perform additional vibration simulations
Perform additional torque analysis
Check VFD effect on motor poles
Check voltage, current, and load requirements
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Risk Assessment
*Highest risk items only, refer to Appendix for full list
ID Risk Effect Cause Severity Likelihood Score Action Item Owner Due
1Displacement is not equal
to 1/32in
Apparatus doesn't meet
UL844Poor design 3 2 6 Make it adjustable Brett DONE
1Displacement is not equal
to 1/32in
Apparatus doesn't meet
UL844Disp. changes during test 3 2 6
Calculate torque required on bolts so
displacement won't slip.Brett DONE
2Vibration is not 2000
cycles per min
Apparatus doesn't meet
UL844Crankshaft slipping 3 2 6 Evaluate previous team's design Nick DONE
2Vibration is not 2000
cycles per min
Apparatus doesn't meet
UL844RPM changes during test 3 2 6
Design closed loop feedback and VFD to
adjust RPMRyan DONE
8 Pinch points existOperator injury could
occurExistence of pinch point 2 3 6 Guard all pinch points Brett DONE
12 Frame falls apart Test fails, costly to fixVibration is same as natural
frequency3 2 6
Perform ANSYS Analysis, add supports to
change natural frequencyNick DONE
12 Frame falls apart Test fails, costly to fix Poor material selection 3 2 6 Perform ANSYS Stress Analysis Nick DONE
12 Frame falls apart Test fails, costly to fix Luminaire is too heavy 3 2 6 Perform ANSYS Stress Analysis Nick DONE
12 Frame falls apart Test fails, costly to fix Improper construction 3 2 6 Use certified welder Nick MSDII
16Electrical shock from
apparatus
Operator injury could
occurImproper wiring 3 2 6 Use certified electrician Ron MSDII
15Project deadline is not
metCustomer is dissatisfied Correction of mistakes 3 2 6 Participate in milestone design reviews ALL Ongoing
Severity Scale: 1 = Minor, 2 = Noticeable, 3 = Severe
Likelihood Scale: 1 = Improbable, 2 = Possible, 3 = Very Likely
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MSD II Schedule
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MSD II Schedule
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Concerns/Issues
Where to place display?
Modifying apparatus once shipped to CCH for testing?
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Questions?
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Appendix
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Full Risk Analysis ID Risk Effect Cause Severity Likelihood Score Action Item Owner Due
Poor design 3 2 6 Make it adjustable Brett DONE
Disp. changes during test 3 2 6 Calculate torque required on bolts so displacement won't slip. Brett DONE
Poor calibration 2 1 2 Define calibration procedure and schedule Jake MSDII
Crankshaft slipping 3 2 6 Evaluate previous team's design Nick DONE
RPM changes during test 3 2 6 Design closed loop feedback and VFD to adjust RPM Ryan DONE
Belt slips 2 2 4 Use v-belt and belt guard (for oil drip) Ashley DONE
Motor inefficiencies 3 1 3 Accept Risk --- DONE
Belt is too loose 1 2 2 Design motor mount to be adjustable Ashley DONE
Frame misalignment 2 1 2 Write procedure to verify conduit is 100% vertical Claire MSDII
3 Motor burns out Costly to replace, test fails Motor burns out 3 1 3 Calculate required torque and RPM, select appropriate motor Ron DONE
Crankshaft improperly lubricated 3 1 3 Define maintenance procedure and schedule Ron MSDII
Motor is too loud 2 1 2 Add motor enclosure, sound damping, hearing protection Brett MSDII
Vibration of frame 2 1 2 Add sound damping, add hearing protection Brett MSDII
Luminaire breaks and rattles 2 1 2 Accept Risk - test will be ended early --- DONE
Operators don't wear earplugs 1 2 2 Accept Risk - exposure duration is still low --- DONE
Fixed guard not in place 3 1 3 Place warning labels on apparatus Brett MSDII
Machine not properly guarded 3 1 3 Install polycarbonate guard and belt guard Brett MSDII
Energy source not isolated 3 2 3 Install location to lockout machine Brett MSDII
Lockout not observed 3 1 3 Accept Risk --- DONE
Button is broken 3 1 3 Define maintenance schedule Ryan MSDII
Electrical failure 3 1 3 Use certified electrician Ron MSDII
8 Pinch points exist Operator injury could occur Existence of pinch point 2 3 6 Guard all pinch points Brett DONE
Setup requires awkward positioning 2 2 4 Design conduit to be assembled first, then attached all at once Claire DONE
Luminaire is too heavy 2 1 2 Specify use of lift assist or 2nd operator, Design for use Brett MSDII
10 Can't mount all configurations typesCustomer is not able to test some
configurationsProject scope 2 2 4 Use current fixtures Claire DONE
11 Oil spill on motor connection Motor failure/smoke Leakage 1 2 2 Offset motor so oil can't drip on it Ashley DONE
Vibration is same as natural frequency 3 2 6 Perform ANSYS Analysis, add supports to change natural frequency Nick DONE
Improper construction 3 2 6 Use certified welder Nick MSDII
Poor material selection 3 2 6 Perform ANSYS Stress Analysis Nick DONE
Luminaire is too heavy 3 2 6 Perform ANSYS Stress Analysis Nick DONE
13 Project runs over budget
Customer is dissatisfied,
engineering requirements must be
sacrificed
Unforeseeable expenses 2 2 4 Proper budgeting/compare prices/buy standard sizes Nick Ongoing
14 Apparatus is larger than existing one Customer is dissatisfied New holes must be drilled in concrete floor 1 2 2 Accept Risk --- ---
Correction of mistakes 3 2 6 Participate in milestone design reviews ALL Ongoing
Delay in Tool Shop 2 2 4 Schedule machine time 1 week in advance with Tool Shop Ashley MSDII
Materials are delivered late 2 2 4 Order during Winter Break Nick 1/17/2014
16 Electrical shock from apparatus Operator injury could occur Improper wiring 3 2 6 Use certified electrician Ron MSDII
17 RPM can't be measured accurately Apparatus doesn't meet UL844 Tachometer vibrates too much 3 1 3 Add damping Jake MSDII
18 Unable to integrate measurement devices with displayMachine is just as difficult to setup
and monitor as beforeLack of knowledge 2 2 4 Research integration requirements and prepare LabView backup Ryan 12/20/2013
19 Can't get items (Motor, VFD, etc.) from Eaton in available timeNeed to purchase items instead,
increased cost of projectLead time is too long 2 2 4
Request items by specified date from CCH and ask for delivery date. Have
backup supplier prepared.Ron DONE
Severity Scale: 1 = Minor, 2 = Noticeable, 3 = Severe
Likelihood Scale: 1 = Improbable, 2 = Possible, 3 = Very Likely
1
2
Machine is too loud4
Operator injury could occurMachine operates when moving parts exposed5
Hearing conservation or
engineering intervention is
required
Apparatus doesn't meet UL844Vibration is not 2000 cycles per min
Apparatus doesn't meet UL844Displacement is not equal to 1/32in
Operator injury could occurMachine starts during maintenance6
Operator injury could occurEmergency stop doesn't work7
Customer is dissatisfied, Students
receive poor course grade, RIT's
reputation is negatively impacted
Project deadline is not met15
Operator injury could occurApparatus is not ergonomically safe to setup9
12 Frame falls apart Test fails, costly to fix
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Engineering Analysis: Displacement
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Engineering Analysis: Displacement
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Engineering Analysis: Forces
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Engineering Analysis: Fatigue
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Engineering Analysis: Machine Guarding General Industry (29 CFR 1910)
1910.211(d)(44)
"Pinch point" means any point other than the point of
operation at which it is possible for a part of the body to
be caught between the moving parts of a press or
auxiliary equipment, or between moving and stationary
parts of a press or auxiliary equipment or between the
material and moving part or parts of the press or
auxiliary equipment.
1910.212(a)(1)
Types of guarding. One or more methods of machine guarding shall be provided to protect the
operator and other employees in the machine area from hazards such as those created by point
of operation, ingoing nip points, rotating parts, flying chips and sparks. Examples of guarding
methods are-barrier guards, two-hand tripping devices, electronic safety devices, etc.
Plus specifics for Electrical Markings, Lubrication Access, Belts, and more
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Power Calculations
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Bolt Torque
Guide
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Morph
Table
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Attach Luminaire
Measure Vibration Displacement
Measure Vibration Frequency
Measure Elapsed Time
Display Feedback
Protect Operator - Hearing
Protect Operator - Moving Parts
Rust Protection
Move Crankshaft
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Architecture
Central System
Power supply Motor system
Sensors
Display/user
interface
Luminaire
connection
Crankshaft
connection
Safety features
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Alternatives Considered:
Design Element:
Evaluation Criteria Paint Electroplate Anode Stainless
Technical difficulty - - +
Cost - 0 -
Durability + 0 +
Maintenance + - +
Time required - + -
Total + +2 +1 +3
Total - -3 -2 -2
Net 0 -1 -1 +1
Rust Protection
DATUM
DATUM
Design Element:
Evaluation Criteria Screws Pins Socket Magnet
Setup time required + - +
Durability - 0 -
Cost - + -
Compatibility with luminaires 0 - -
Total + +1 +1 +1
Total - -2 -2 -3
Net 0 -1 -1 -2
Attach Luminaire
DATUM
DATUM
Design Element:
Evaluation Criteria Vertical Direct Speed Reducer Vertical w/ Belt Horiz. w/ 90°
Rotational capabilities - + -
Motor life + + +
Technical difficulty - - -
Safe to operate 0 - 0
Cost - + -
Maintenance - - -
Lubrication isolation + + +
Total + +2 +4 +2
Total - -4 -3 -4
Net 0 -2 +1 -2
DATUM
DATUM
Move Crankshaft
Consider Systems Level
Consider Systems Level
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Design Element:
Evaluation Criteria Dial Gauge Laser Electrical Contact Magnify Ruler
Connection difficulty + - -
Cost - - 0
Technical difficulty - - +
Accuracy + + -
Durability + 0 -
Dual purpose + + -
Total + +4 +2 +1
Total - -2 -3 -4
Net 0 +2 -1 -3
Measure Vibration
Displacement
DATUM
DATUM
Alternatives Considered:
Design Element:
Evaluation Criteria Stopwatch Software Egg Timer Hourglass
Technical difficulty - + +
Cost - 0 0
Durability + 0 -
Accuracy + - -
Expandability + - -
Total + +3 +1 +1
Total - -2 -2 -3
Net 0 +1 -1 -2
Measure Elapsed
Time
DATUM
DATUM
Design Element:
Evaluation Criteria Tachometer Laser Electrical Contact Pedometer
Cost - - +
Technical difficulty - - +
Accuracy + 0 -
Connection difficulty + 0 -
Dual purpose + + 0
Durability + 0 0
Total + +4 +1 +2
Total - -2 -2 -2
Net 0 +2 -1 0
DATUM
DATUM
Measure Vibration
Frequency
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Design Element:
Evaluation Criteria Seven Segment LED iPhone Dial
Expandability + + -
Cost - - +
Technical difficulty 0 - +
Ease of data relay 0 - -
Lifespan 0 - +
Display accuracy 0 0 -
Total + +1 +1 +3
Total - -1 -4 -3
Net 0 0 -3 0
Display Feedback
DATUM
DATUM
Alternatives Considered:
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Design Element:
Evaluation Criteria Guard Plate Robot Enclosure Light Curtain
Safety + 0 -
Cost - - -
Interference with apparatus - - +
Technical difficulty - + -
Durability - 0 -
Dual purpose 0 + 0
Total + +1 +2 +1
Total - -4 -2 -4
Net 0 -3 0 -3
Protect Operator -
Moving Parts
DATUM
DATUM
Design Element:
Evaluation Criteria Damping Pads Earplugs Damp. Enclosure
Area of effect - 0
Cost + -
Safety 0 0
Interference with apparatus + -
Durability 0 0
Technical difficulty + -
Dual purpose 0 +
Total + +3 +1
Total - -1 -3
Net 0 +2 -2
DATUM
DATUM
Protect Operator -
Sound
Alternatives Considered:
Consider Systems Level Consider Systems Level
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VFD internal circuitry
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