The Design of a Six DegreeofFreedom Stewart Platform Load Frame for Testing Spinal Tissue

1
The Design of a Six Degree-of-Freedom Stewart
Platform Load Frame for Testing Spinal Tissue

• Glenn Sanders
• Capstone Design Project
• Advised by Professor Ron Bucinell
• Fall 2003-Winter 2004

2
What is being studied at Albany Medical Center?

• Motion Segment of a Spine

The Major Motions of the Spine
3
Benefits of Working at AMC

• Working with actual 6 DOF Load Frame
• Can see where improvements can actually be made
• Learn the limits that a 6 DOF Load Frame must
  have in
• Load
• Angle
• Moment

4
What is a Stewart Platform?

• Characterized by six Degrees-of-Freedom
• An assembly consisting of
• Base
• Top Platform
• Six Actuators
• Universal Joints

5
The Development of the Stewart Platform

• 1949 - Dr. Eric Gough testing tires

• 1965 D. Stewart simulating flight

Present- Developments in precision machine tools,
surgical robots, flight and aeronautical
simulators, etc.
6
Stewart Platform Examples
7
How can Stewart Platforms benefit spinal research?
Sanders-Goodjohn Stewart Platform
AMC Six Degree-of-Freedom Load Frame
8
Advantages of the Sanders-Goodjohn Stewart
Platform

• Six Degrees-of-Freedom
• Stiffness of Octahedron Shape
• Accurate and Precise Measurements
• Coupling moments
• Small Size

9
Underlying Principles behind the Movement of the
Stewart Platform
Bi-Directional Hydraulic Actuator
Hydraulic System of Stewart Platform
10
What are the winter term goals?

• Run Finite Element Analyses on the Stewart
  Platform
• Run Dynamic testing to find make sure physical
  limitations meet required limitations
• Manufacture the Platform
• Work with partner to control one actuator

11
Acknowledgements

• Kurt Goodjohn Project Partner
• Professor Bucinell Project Advisor
• Professor Krouglikof Expertise Advise in
  Robotics
• Professor Traver Kurt Goodjohns Advisor
• Dr. Eric Ledet and Dr. Mike Tymeson from Albany
  Medical Center

12
Any Questions

• ?