RP1: P08205 & P08208
Meeting Purpose
This is the first review of the RP1 Senior Design projects P08205: Wireless PWM Motor Control Focus Group and P08208: Mechanical Design Focus Group, which will collaborate in development of a set of wireless controlled motor modules to transport a 1kg payload. The intent is the introduction of project preparation, planning, and subsystem concepts which have been evaluated via the Pugh method.
Guests have been invited to reflect on the project progress, helping to steer towards better solutions.
Materials Reviewed
CDR_Pre-read.doc (Rev. 02)
Attendees:
Professor Slack (EE / EE Advisor)
Emillion Barrault (ME / French Collaboration Lead)
Ryan Hellems (ME / P08002 member)
Jessica Stalker (ME / P08002 member)
Jeffery Ozbourne (ME / P08002 member)
Recorded by (names and roles of person recording meeting notes):
______(signature of person recording meeting notes)
Meeting Date:
01.18.08
2:00PM – 4:00PM
Mobil Conference Room
Previous Open Action Items Reviewed
N/A – First Review
Discussion (describe any relevant discussions not captured in actions / issues / decisions tables):
o Long-term Outlook - Packaging Science Collaboration
§ Can they provide rudimentary recommendations?
§ Could table top drop test requirement spin off to be a packaging science project?
o
Action Items /Item # / Description / Responsible / Due Date / Close Date / Comments /
A001 / Edit grammar of “Wireless PWM Communications” to read “PWM controlled motors to be controlled by wireless communication”
(Slack)
A002 / Req’t: Edit “remote controlled” to read “Wireless control” / Reid / 01.22.08 / QFD updated
A003 / Contact Packaging Science Students
- Simple suggestions
- Continued project potential / Reid / 4 students contacted
A004 / Req’t: Backward compatible with prior generation command sets
[I015] / QFD updated
A005 / EM: Edit to be “Cost of Product per Project Team” / Reid / 01.22.08 / QFD updated
A006 / EM: Clarify target spec to be “HxWxD” / Reid / 01.22.08 / QFD updated
A007 / EM: Evaluate target of < 100 unique components
§ Count/Estimate # of unique components on RP10
§ “high”
(E.H.)
A008 / Review P07201’s concerns about bevel gears
[I007]
A009 / Review P07201’s “future work” / ALL
A010 / Review RP10 Customer Reqt’s / Reid
A011 / Needs: Estimate battery life & operational range of wireless communication / QFD updated
A012 / EM: Correct to read “Weight of platform and platform components” / Reid / 01.22.08 / QFD updated
A013 / EM: Evaluate accuracy target, 2 in/12in
(E.H)
[I016]
A014 / Quantify overall accuracy of system [%]
(E.H.) / End of MSD II
A015 / EM: Correct to be “time to attach each MM” / Reid / 01.22.08 / QFD updated
A016 / Req’t: Make safety a yes/no user requirement / Reid / 01.22.08 / QFD updated
A017 / Develop functional diagram for user inputs
(Slack) / Phil
A018 / Fix MS Project Schedule Errors
§ Add Wk 10 – Proj Presentations
§ Correct items lacking date / Wendy
A019 / Evaluate use of C-channels in Yoke Design
(WWW)
A020 / Evaluate “Everything on MM” Option
§ Project cost
§ Project weight
§ Evaluate on cost, weight, and user value, and complexity
A021 / Determine pin limits of microcontroller
(E.H.)
A022 / Feasibility study of regenerative braking
(E.H)
[I003]
A023 / Determine wireless functionality requirements
§ Data rate
§ # of nodes
§ Range / QFD updated
A024 / Evaluate method of achieving “Health” feedback
(E.H.)
[I006]
A025
A026
A027
A028
A029
A030
A031
A032
A033
Issues /
Item # / Description / Responsible / Open Date / Close Date / Comments /
I001 / Customer Requirements:
Is remote control = wireless?
(Slack) / Reid
I002 / H-bridge =?= Motor controller
(see functional diagram) / Controls
I003 / Is regenerative braking achievable? Desirable for future teams
(E.H.)
[A022]
I004 / “Are Pugh Matrix rankings on engineer’s opinion or quantifiable facts”
(Drive)
(E.H.) / Andrew
I005 / Does MM need to be individually addressable?
- Addressable with own receiver?
- Controllable via single mote? / Electronics
I006 / How to communicate Motor Module “Health?”
- Store for post-run
- Transmit wirelessly
o Data transfer limitations of wireless network
(E.H.)
[A024]
I007 / Susceptible design of bevel gears
(E.H.)
[A008] / Mechanical Design
I008 / Drive System:
- Time to replace belt?
- Time to replace bevel gear?
- Time to replace wheel?
- Gear ratio?
(E.H.) / Andrew
I009 / Critical Design Point:
- Teeth mating
- Miter gear misalignment
- “Cantilevered shaft off of bearing is not a robust design”
- Axels
(E.H.) / Mechanical Design
I010 / “How do you even know that your drive system will work?”
- motor curve
- electrical constraints on motor
o PWM signal
o Excess heat
(E.H.) / Andrew
I011 / Is duty cycle proportional to linear speed?
(Slack) / Controls
I012 / In-rush current @ high duty cycles
(Slack)
I013 / Correct speed requirement
- Is 10 in/s too much?
I014 / Architecture of application level
(Slack) / Phil
I015 / Backwards compatible software command sets
§ Software used?
§ Functionality?
§ Weaknesses
§ Improvements
§ P08201 approach
[A004]
I016 / EM: Accuracy of Movement EM
§ “linear variation over transverse movement”
§ “tighten up target specs”
(E.H.)
[A013] / QFD updated
I017
I018
I019
I020
I021
I022
I023
I024
I025
I026
I027
I028
I029
I030
I031
I032
I033
I034
Decisions /
Item # / Description / Responsible / Decision Date / Comments /
D001 / On-board battery re-store not required
(E.H.)
D002
D003
D004
D005
D006
D007
D008
D009
D010
D011
D012
D013
D014
D015
D016
KGCOE MSD Page 2 of 10 Concept Design Review