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P14045: Mobile Pediatric Stander System Design Review.

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Presentation on theme: "P14045: Mobile Pediatric Stander System Design Review."— Presentation transcript:

1 P14045: Mobile Pediatric Stander System Design Review

2 ●I ntroduction ●Background/Problem statement ●Customer Requirements ●Engineering Requirements ●Benchmarking Specs ●Functional Decomposition ●Concept Generation/Selection ●System Architecture ●Risk Assessment ●Engineering Analysis ●Test Plan Outline ●Project Schedule Agenda Week 6 Project Presentation - 10/1/13 2

3 Greg Roeth: Project Manager/Mechanical Engineer Alex Hebert: Lead Mechanical Engineer Emily Courtney: Mechanical Engineer Martha Vargas: Lead Electrical Engineer John Daley: Electrical Engineer Who’s who? Week 6 Project Presentation - 10/1/13

4 ●Predominantly pre-school kids with Cerebral Palsy (CP) CP is a “non progressive brain disorder” caused by damage to a developing brain o disconnection between muscles and the brain  wide range of motor skills/control o condition typically doesn’t worsen or improve over time Some users are on the Autism spectrum as well Project Background *taken from familymedicinehelp.com Who will use our mobilized standers? *taken from cprochester.org Week 6 Project Presentation - 10/1/13

5 Teaching Style: - Push In vs. Pull Out Happier Kids Physiological and psychological benefits to standing vs. sitting Snug Seat Product Guide 2013 What is a mobile pediatric stander? Project Background Week 6 Project Presentation - 10/1/13

6 Problem Statement: ●A motorized pediatric stander is a device similar to a wheelchair, meant to assist a disabled child to move around their environment in an upright position. The device should be able to provide safe, comfortable, and smooth transportation of the passenger, with the ability to be controlled by a third party. A previous prototype used buttons to control its movement, but the start/stop was found to be very jerky and the stander did not track straight. The remote control functionality was attempted, but was not fully implemented. Safety features were not fully developed. ●The goals for this project are to modify the existing prototype to include better safety features such as collision detection and a remote control for a third party. Since there are no standing patents on automated standers key constraints are cost and weight of the components we add. Project Background Week 6 Project Presentation - 10/1/13

7 Customer Requirements Week 6 Project Presentation - 10/1/13

8 8

9 Benchmarking Old Systems Week 6 Project Presentation - 10/1/13

10 Week 6 Project Presentation - 10/1/13

11 ●Control System Mounting ●Electronics housing ●Wheel System ●Microprocessor ●Bluetooth Module ●Control Scheme Concept Selection Week 6 Project Presentation - 10/1/13

12 / https://www.ssidisplays.co m/ Week 6 Project Presentation - 10/1/13

13 Control System Mounting Week 6 Project Presentation - 10/1/13

14 Pros: ●Avoids sharp corners adjustable ●Multi Size Cons: ●potential break down ●weight restrictions Gooseneck Arm Week 6 Project Presentation - 10/1/13

15 Pros: ●Fully Adjustable Cons: ●Limited Orientation ●iPad only Swivel Arm Week 6 Project Presentation - 10/1/13

16 Pro: ●wide workspace Cons: ●Fixed ●Doesn’t move out of the way ●toucan only Snug Seat Tray Week 6 Project Presentation - 10/1/13

17 Concept Selection Process Week 6 Project Presentation - 10/1/13

18 ●Magnetic tray ●Swappable Touchpad/iPad ●Collapsible Final Concept Week 6 Project Presentation - 10/1/13

19 ●Control System Mounting ●Electronics housing ●Wheel System ●Microprocessor ●Bluetooth Module ●Control Scheme Concept Selection Week 6 Project Presentation - 10/1/13

20 Electronics Housing - Current Design Pros: 1) Battery is secure Cons: 1) Components and wires are exposed 2) Battery tray is rusty and sharp 3)Battery tray in way of stander angle adjustment Week 6 Project Presentation - 10/1/13

21 Electronics Housing - Option 1 Pros: 1) Battery is secure, yet accessible 2) One box, One location 3) Baffles allow airflow and provide spill protection Cons: 1) Need to create mounting area 2) May interfere with folding control mount Week 6 Project Presentation - 10/1/13

22 Pros: 1) All components contained and separate 2) Utilizes available mounting space 3) Utilizes current battery tray mounting Electronics Housing - Option 2 *taken from tadpoleadaptive.com Cons: 1) Multiple parts, multiple locations (3) *taken from ozprodrivers.com.au *taken from123rf.com Week 6 Project Presentation - 10/1/13

23 Electronics Housing - Option 3 Pros: 1) Battery is secure, yet accessible and separate 2) One location - utilizes current tray mounting Cons: 1) Cumbersome - may interfere with angle adjust + a. b Week 6 Project Presentation - 10/1/13

24 Electronics Housing - Concept selection vs Week 6 Project Presentation - 10/1/13

25 ●Control System Mounting ●Electronics housing ●Wheel System ●Microprocessor ●Bluetooth Module ●Control Scheme Concept Selection Week 6 Project Presentation - 10/1/13

26 Current Design: Pros: ●Already implemented on stander. ●Integrates well with parallax motor bearing block. Cons: ●Stander had to be roughly modified for assembly. ●Assembly and stander adaptation is difficult. We would like to implement a solution that integrates with the stander and the motor mounts in an easier way. Wheel System Week 6 Project Presentation - 10/1/13

27 Concept 1: New Bracket New Wheel Mount Concepts Pros: ●More easily attaches to stander ●Doesn’t require modification to stander parts Cons ●Potentially difficult to manufacture Week 6 Project Presentation - 10/1/13

28 Concept 2: New Adapter New Wheel Mount Concepts Pros: ●More easily attaches to stander ●Doesn’t require modification to stander parts ●Utilizes existing adapter block Cons: ●Potential difficulty of assembly Week 6 Project Presentation - 10/1/13

29 New Wheel Mount Concepts Week 6 Project Presentation - 10/1/13

30 ●From the preliminary Pugh charts, it seems like the new adapter is the way to go. ●Still to-do ○ Measure existing stander mounts ○ Perform preliminary engineering analysis on current designs. New Wheel Mount Concepts Week 6 Project Presentation - 10/1/13

31 ●Control System Mounting ●Electronics housing ●Wheel System ●Microprocessor ●Bluetooth Module ●Control Scheme Concept Selection Week 6 Project Presentation - 10/1/13

32 Last Year’s Group: Stellaris ●Fully developed Board, lots of unnecessary additions ●Used Ti’s Code Composer ●Expensive, mitigated by the MCU contest (now finished) Contenders Launchpad - Stellaris or MSP430 ●TI products - similar to last years group ●Cheap ●Lots of add-ons, lots of support Arduino ●Lots of add-ons ●Extensive libraries, easy to use Raspberry Pi ●single board computer (overkill) ●Linux environment STM32 F3 ●ARM processor similar to last years Microprocessor *image from mouser.com Week 6 Project Presentation - 10/1/13

33 Microprocessor *images from wiki.ti.com, en.wikipedia.org, jaunty-electronics.com, bit-tech.net Week 6 Project Presentation - 10/1/13

34 ●Control System Mounting ●Electronics housing ●Wheel System ●Microprocessor ●Bluetooth Module ●Control Scheme Concept Selection Week 6 Project Presentation - 10/1/13

35 Bluetooth Module Images from robotshop.com,, processors.wiki.ti.com/, bluegiga.com,, and sparkfun.com, Week 6 Project Presentation - 10/1/13

36 ●Control System Mounting ●Electronics housing ●Wheel System ●Microprocessor ●Bluetooth Module ●Control Scheme Concept Selection Week 6 Project Presentation - 10/1/13

37 Control Scheme - Pugh Concept Selection Decision Matrix Cited Sources: Imageshttp://www.etac.com/uploa d/NL-Etac/E800/Wheelchair- accessories-R-NET-Controller- Joystick-36-0.jpghttp://www.etac.com/uploa d/NL-Etac/E800/Wheelchair- accessories-R-NET-Controller- Joystick-36-0.jpg 0607/ /0/ /Pr ogrammable_Control_System_Wir eless_Touch_Screen.jpg https://www.ssidisplays.com/sites/ default/files/img_2352.jpg _1/6-pcs-of-60mm- lighted-font-b-button-b-font-font-b- Illuminated-b-font-round.jpg Week 6 Project Presentation - 10/1/13

38 ●Custom design based on P ●Reduce size and adapt ergonomically to user. ●Use same uController as main system. Remote Control Last year’s model consisted on a TI Stellaris Launchpad controller encased in a box with 5 buttons and two switches Week 6 Project Presentation - 10/1/13

39 ●Control System Mounting ●Electronics housing ●Wheel System ●Microprocessor ●Bluetooth Module ●Control Scheme Concept Selection Week 6 Project Presentation - 10/1/13

40 Week 6 Project Presentation - 10/1/13

41 System architecture: Level Week 6 Project Presentation - 10/1/13

42 Week 6 Project Presentation - 10/1/13

43 Risk Assessment IDRisk ItemEffectCauseLSIAction to Minimize RiskOwner 1 Damage to electronics Loss of injured component, increase in cost to replace items Overloads, water, blunt force trauma, gunshots, angry group members 326 Work on electronics in a lab and use proper ESD protection, design protective casing, Perform weather test very carefully and without electronics. Group split 2 Motors don’t drive straight User had to compensate, or device is unusable Poor software development 133Proper testingEEs 3Damage to standerIncreased cost/time Crashing, improper operation, ill considered modifications 133 Proper planning and testing only in controlled environment, design reviews before proposed modifications, Group split 4 Injuring user Loss of test subject, possible end of project, lawsuit Improper operation, improper design 133 Design correct specs, tests of modifications, tested by dummy before patient Group split 5Injuring bystander Possible end of project, lawsuit Improper operation, improper design 133 Design correct specs, test in controlled environment Group split 6Software is buggyDevice could not function, could just have quirks little experience in programming 224Have expert review over software, pull in extra resources around RIT EEs Week 6 Project Presentation - 10/1/13

44 Risk Assessment (Cont.) IDRisk ItemEffectCauseLSIAction to Minimize RiskOwner 7 Work not completed on time Loss of time and goodwill in group, failure to complete project fully Poor planning and time management 236In depth project plan that is FOLLOWEDEveryone 8Lack of funds Can’t buy components overspending, lack of support from sponsor 122 Good project plan, very awesome faculty guide Leads 9 Inconsistent team priorities Wasted time and money, interpersonal tension Lack of team values, poor communications, poor management/planni ng 122Weekly meetings Leads and Guides 10 Customer changes mind in focuses Wasted time, product does not satisfy customer Poor communication with Linda/Steve, bad problem statement 133 Meet with Linda and her on major project updates and major branches of development 11Conflicting customer ideas Compromises that leave everyone dissatisfied Poor communication between Linda and Steve 313Include Dr. Day and Linda on meetings and design reviews, encourage dialogue in Week 6 Project Presentation - 10/1/13

45 Risk Assessment (Cont.) IDRisk ItemEffectCauseLSIAction to Minimize RiskOwner 12Processor Change Loss of time due to changed code, more money and development costs Choice made too quickly and too early in development 122 Make code in higher level language, such as C instead of assembly 13Tipping Injuring user, damage to stander, especially upper portions Poorly thought out modifications, too much acceleration 133 Do better testing and survey the usage site. Make sure deceleration is not very large, govern the speed. 14Battery Overheating Damage to Electronics Poor Airflow, too much insulation and overuse 133 Monitor temperature, thermal shut offs, good enclosure design, don’t use a li-po 15 Dangerous Stander Design Injuring user Sharp edges and loose connection (electrical and mechanical) 224 No sharp edges, check all electrical connections that no powered surface is accessible 16Long lead time on parts Delay of project due to lack of parts so no testing, design, building Long lead time from manufacturers, parts out of stock 224Order early, order often, have alternatives for things to work on, do fab. work in house Week 6 Project Presentation - 10/1/13

46 Engineering Analysis Week 6 Project Presentation - 10/1/13

47 Test Plan Outline Week 6 Project Presentation - 10/1/13

48 Test Plan Outline Week 6 Project Presentation - 10/1/13

49 Project Schedule Week 6 Project Presentation - 10/1/13

50 ●I ntroduction ●Background/Problem statement ●Customer Requirements ●Engineering Requirements ●Benchmarking Specs ●Functional Decomposition ●Concept Generation/Selection ●System Architecture ●Risk Assessment ●Engineering Analysis ●Test Plan Outline ●Project Schedule Agenda Week 6 Project Presentation - 10/1/13

51 Questions? Week 6 Project Presentation - 10/1/13


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