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CONCEPT DESIGN REVIEW GROUP MEMBERS: Irma Bocova Rob Bowman Phetphouvanh “Awt” Phommahaxay Kyle Pilote Jeff Rebmann Chris Rowles Faculty Guide: Dr. Elizabeth.

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Presentation on theme: "CONCEPT DESIGN REVIEW GROUP MEMBERS: Irma Bocova Rob Bowman Phetphouvanh “Awt” Phommahaxay Kyle Pilote Jeff Rebmann Chris Rowles Faculty Guide: Dr. Elizabeth."— Presentation transcript:

1 CONCEPT DESIGN REVIEW GROUP MEMBERS: Irma Bocova Rob Bowman Phetphouvanh “Awt” Phommahaxay Kyle Pilote Jeff Rebmann Chris Rowles Faculty Guide: Dr. Elizabeth DeBartolo October 9 th, 2009 Mechanical Spine Test Platform P10007

2 Agenda Desired Outcomes – 11:30am Project Background – 11:35am  Needs  Specifications  Work Breakdown Structure Concept Generation – 11:45am Concept Selection – 12:05pm Systems Architecture – 12:20pm Risks/Feasibility – 12:40pm Next Steps

3 Desired Outcomes of Review Gain project understanding Receive input on selected concept Identify and discuss key risks:  Range of motion  Sensor size  Cost Decision to move forward to Detailed Design

4 Mission Statement The intent of this project is to design and build a test platform that will mimic the actions of a human spine. This design will incorporate movements in three dimensions, while being able to independently measure the angles and linear adjustments. The purpose of developing this platform is to validate the data from an existing measuring device in use at the Nazareth Physical Therapy Clinic.

5 Project Description Project Title: Project Title: Mechanical Spine Test Platform Primary Customer Primary Customer  Dr. Sara Gombatto  Professor at Nazareth College of Physical Therapy  Dr. JJ Mowder-Tinney  Director of Clinical Education Nazareth College Department of Physical Therapy  Physical therapy patients Secondary Opportunities Secondary Opportunities  Further spinal iterations

6 Background/Application Nazareth Physical Therapy Clinic motion capture system  Allows motion capture of PT patients in order to track progress Validation of existing motion captures Focus on spinal segments Secondary Application:  Portable Motion Tracking System calibration Source: Source:

7 Customer Needs Three tiered approach to group needs and limit scope  Base Plan  Aggressive  Outstanding Example Need: Must be moveable in distinct segments  Base Plan – Two distinct sections (Lower & Upper Lumbar)  Aggressive – Three distinct sections (Lower & Upper Lumbar, Thoracic)  Outstanding – Divide Thoracic segment into multiple segments Highest Ranked Needs – Base Plan Needs to be able to measure angle deviations for all sections relative to the section below it Use a tight tolerance for measurements Provide measurements in all three planes of space (x, y, z) Needs distinct sections of the spine to be able to move Needs to be adjustable lengthwise in order to simulate different size spines Movements needs to be lockable so that an accurate measurement can be read The height of the device has to be the level of a spine of a person standing in an upright position Needs to have a “zero” position for all sensors/joints

8 Engineering Specifications Correspond to highest ranked Customer Needs: SpecificationUnits Base Plan Value Aggressive Value Outstanding Value Must have a minimum tilt in all directions relative to the section below degrees +/- 20 Angle tolerancedegree+/- 0.1 Must have a tilt in all directions relative to the section below planes 3 (sagittal, transverse, frontal) Must be movable in distinct sections and a fixed base (pelvis) movable sections 2 (lower lumbar, upper lumbar) 3 (thoracic)Divided thoracic Should be able to fit all required ranges needed by customer vertically millimeters for each lumbar segment 200 – 300 for thoracic segment Joint strengthFt - lbs Device must mimic a person standing in an upright position - Trochanterior Height millimeters Device has mechanical "zero" positionYes/No Yes

9 Work Breakdown Structure - Team Member Roles

10 Brainstorming

11 Initial Concepts - Electrical Measurement Devices  Weighted Pendulum  Potentiometer  Rotational Inductor  Shaft encoder  Accelerometer  2-axis tilt  Electrogoniometer  1-axis tilt sensor  3-axis tilt sensor  Protractor  Caliper  Linear position  Ruler DAQ  Pen and Paper  Tilt logger  Single channel  Multi-channel  Analog  No DAQ  Digital reader Interface  Excel  ExceLinx  LabVIEW  WedgeLink  Etas  Matlab

12 Initial Concepts - Mechanical Members  Threaded linear adj  Discreet peg adj  Slot/slide adj  Rack and pinion adj  Telescoping  Folding side panel  Velcro adj  Pneumatic linear adj  Quick release adj  Scissor horizontal adj  Compression spring horizontal adj  Flap adj  Accordion adj Stands  Foldable X stand  Casters  Tripod  Four legs  Square  Round  Chair base  Rotational U joint Joints  Stack door hinges  Ball and socket joint  Finger clamp  Air muscle  Geared rotation  U joint  Ball detent lock  Split ball joint  Threaded compression lock  Friction lock  Tension lock  Flex joint

13 Initial Selection Criteria Initially used four selection criteria  Usability  Cost  Development time  Availability Enabled us to reduce the number of possible to concepts to a more manageable amount

14 Initial Selection - Electrical Measurement Devices  Rotational Inductor  2-axis tilt  Ruler  Displacement Sensor DAQ  Pen and Paper  Multi-channel Output Interface  Digital display  Excel  ExceLinx  Labview  WedgeLink

15 Initial Selection - Mechanical Joints  Ball and socket joint  Split ball joint  U joint  Threaded compression lock ball joint Default Home Position  "Removable Slider" Mechanical stop  Ball detente home Position Joint Locking  Tension Locking  Passive Friction lock Vertical Linear Adjustment  Slot/slide adj  Multi-segmented telescoping  Discreet/ peg adj Horizontal Linear Adjustment  Slot/slide adj  Fixed  Multi-segmented telescoping  Discreet/ peg adj folding side panel  Rack and pinion Base  Casters  Tripod  Four legs

16 Final Selection Criteria Used final engineering specifications as a basis for final selection criteria  Acted as a map to link specifications to device Added to list for clarity:  Lockability  Programming intensive  Software compatibility with DAQ

17 Final Concept - Electrical Measurement Devices - Angular  Rotational Inductor  2-axis tilt sensors Measurement Devices – Linear  Displacement Sensor DAQ  Multi-channel Computer Output Interface  Excel-based program

18 Tripod base Slot/slide adj for vertical adjustment Final Concept - Mechanical Split ball joint - Requires movement procedure "Removable Slider" Mechanical stop Tension Locking Fixed bar for horizontal adjustment - Camera sensors will move along fixed bar

19 System Architecture

20 Final Concept Sketch PDF version of sketch:  tent/P10007/public/Sy stem%20Architecture.p ng tent/P10007/public/Sy stem%20Architecture.p ng

21 Mechanical Risks Risk EffectCause Probability Severity Overall Risk Contingency Response Tripod Variability in level positionMeasurement error The tripod top is not a rigid body LHM Select a tripod that fits the range of height adjustment without the need to adjust leg height Instability if members exceed center of mass Tipping over Tripod legs are set too close together LHMUse a counter weight Ensure tripod legs provide wide enough platform Split Ball Joint May not be available to purchase in required size Redesign The joint does not exist at that size MHHModify existing ball joint Fabricate ball joint Inadequate clamping force Joints will not hold static position The clamp may not be strong enough LHMIncrease size of bolt and knob Joint is too large Limit the linear adjustability MMM Increase member size for scalability factor Move the linear adjustability off the sensor placement area Joint may gradually wear over multiple cycles Will not hold a static position Repeated usesLHM Provide information for a replacement part

22 Mechanical Risks Risk EffectCause Probability Severity Overall Risk Contingency Response Slide/Slot Members Non reflective finish on contact surfaces may wear over time Introduce IR interference Finish will wear after repeated uses HHH Anodize or powder coat material Use a non reflective material Not rigid at extreme extensionsSkew measurements The locking mechanism will not provide strength LHM Build member to leave adequate extreme range space Lowest range position may interfere with movement Does not allow 20 degrees of tilt The member will come in contact with the member above/below MHM Limit the low end range of adjustability, only satisfy a percentage of the ergonomic range Fixed Horizontal Members Collision with other horizontal members when linear adjustment is at low end range Does not allow 20 degrees of tilt LLL Make the horizontal members foldable Rotate members out of plane

23 Electrical Risks Risk EffectCause Probability Severity Overall Risk Contingency Response Sensors Sensor size Can not be implemented on the mechanical parts Availability of sensor size. HHH Sensor research (list of usable sensors) Sensor pricing Not meeting customer needs and limited fund. Sensor characteristics and function (tolerance, size, resolution etc) MMH Sensor research and professional advice. Sensor accuracy Not meet customer needs (0.1 º ) Sensor characteristicsMLMAttaining sensor information. Interference between the sensors. Inaccurate/ no measurements. Sensor technology.MLM Contact company for concerns. Sensor durability Not operational device. Sensor technology, misused, MML Provide backup sensors. Attain warranty. DAQ DAQ specs. Not being able to communicate with sensors. Sensor recognition/ signal processing LHMProfessional advice. Connectors (wires) System not functioning correctly. Incorrect connectorsLLLSuppliers verification. Computer Integration Lack of integration with DAQ Sensor output will not be complete Wrong choice of software LHM Implement different software package Lack of software support from downloaded programs No answers when help is needed Not being developed currently, free program lacks support LMM Use faculty and guide support to work through issues

24 Next Steps… Implement action items from Concept Design Review Schematics/Drawings In-depth feasibility analysis  Scaled prototyping Bill of Materials Develop test planning Create MSD II schedule


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