mechanical spine test platform p10007
DESCRIPTION
Mechanical Spine Test Platform P10007. Final Project Overview GROUP MEMBERS : Irma Bocova Rob Bowman Phetphouvanh “ Awt ” Phommahaxay Kyle Pilote Jeff Rebmann Chris Rowles Faculty Guide : Dr. Elizabeth DeBartolo February 19, 2010. Agenda. Software LabVIEW Output Architecture - PowerPoint PPT PresentationTRANSCRIPT
Final Project OverviewG R O U P M E M B E R S :
I r m a B o c o v aR o b B o w m a n
P h e t p h o u v a n h “A w t ” P h o m m a h a x a yK y l e P i l o t e
J e ff R e b m a n nC h r i s R o w l e s
Fa c u l t y G u i d e : D r. E l i z a b e t h D e B a r t o l o
February 19 , 2010
Mechanical Spine Test Platform
P10007
Agenda
• Mission Statement• Project Description
• Background/Application
• Customer Needs
• Engineering Specifications
• Final Concept Selection
• Mechanical Structures
• Sensor
• Software• LabVIEW Output Architecture
• Validation and Verification
• Specifications Attained
• Project Overview
• Future Iterations
• Project Conclusion
• Acknowledgements
Demo (Time Permitting)
Project Description
Project Title: Mechanical Spine Test Platform
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 Further spinal iterations
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 calibrationSource: http://seneludens.utdallas.edu/images/mocap.jpg
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 PlanNeeds 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
Engineering Specifications
Correspond to highest ranked Customer Needs:
Specification UnitsBase Plan Value
Aggressive
ValueOutstanding Value
Must have a minimum tilt in all directions relative to the section below degrees +/- 20
Angle tolerance degree +/- 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
30 - 150 for each lumbar
segment
200 – 300 for
thoracic segment
Joint strength Ft - lbsDevice must mimic a person standing in an upright position - Trochanterior Height
millimeters 750 - 1000
Device has mechanical "zero" position Yes/No Yes Yes Yes
Final Concept Selection
Spinal Structure & User Interface
Marker Placement Diagram
Main Structure Rendering
Mechanical Structure
Three segments separated by tightening ball-joints (lock into static position)
Non-Ferrous (aluminum, brass, and wood)
1 inch increment segments (2-5 inches adjustability per lumbar segment)
Fixed Pelvis ( adjustable height) with wooden base
Horizontal members for reflective markers
Brass set screws Flat black enamel coating
Sensors
Two MicroStrain 3DM Measures roll, pitch and
yaw DC Accelerometers in
orthogonal array with respect to Earth’s gravity
Magnetometers with respect to Earth’s magnetic fields
+/- 1.0 degree of accuracy
Software
LabVIEW Translate
digital outputs of sensors
Outputs compatible to MS Excel spreadsheet
User Interface
User Interface
Validation and Verification
3DM Sensor Mechanical versus electrical Offsite and Onsite testing Within +/- 1.0 degree of
accuracy (roll, pitch and yaw)
Sensor Test
Fixture
YAW Upper Lumbar
Lower Lumbar
Specification Needed
Average Deviation
± 0.296 ⁰ ± 0.375 ⁰ ± 1.0 ⁰
Standard Deviation
0.162 0.262 --
Accuracy Testing (Worst Case)
Validation and Verification
Spine Platform Onsite testing Mechanical and electrical Simultaneous reading of 3DM Interference (magnetic and
infrared) Static holding position (tension
required) Stability (tipping force) Portability (overall weight) User friendly (setup time and
testing time)
1st Iteration Mechanical & Electrical
test
Specifications Attained
Project OverviewSuccesses
Met a tight accuracy tolerance Able to output real time data and capture to an external
spreadsheet for further analysis Created user friendly platform Custom built ball joints and stand Minimized sensor interference
Recommendations Do not underestimate time needed to complete mechanical
tasks Outsource the welding Use CNC machines when possible for accuracy and time
purposes Further understand the sensitivity issues of the
magnetometer in the sensors Have a better general knowledge of software/hardware
integration
Future Iterations
Add a thoracic region to better represent a human spine Break the segments down even further if possible
Incorporate non-electromagnetic interference design
Look into purchasing NI LabVIEW license for Nazareth College
Wireless sensorsPowder coat or anodize to increase durability
of coating Use a plastic material instead of aluminum
Project Conclusion
The specifications for the final spinal structure and user interface were met for all base plan values and for some of the aggressive values and outstanding values
Customer was satisfied with testing and verification
Customer was satisfied with final user output design and functionality
Acknowledgements
Dr. Sara Gombatto Nazareth College Physical Therapy Department
Dr. Elizabeth DeBartolo Faculty Guide – Rochester Institute of Technology
National Science Foundation Project Sponsor
Dr. Robert Bowman EE Professor – Rochester Institute of Technology
Professor John WellinProfessor Madhu NairRIT Machine Shop Staff