P10010: Motion Tracking Sensor

Kinematics & Placement

Table of Contents

Step 1. Clarify The Problem

When one is attempting to develop a motion tracking system, it is very important to consider the kinematic motion of an human. A human arm, for example, provides nine degrees of motion between the shoulder, elbow, and wrist. One must understand which range of motion they want to measure, and then identify the best way to specifically measure that range of motion without interference from unwanted inputs. In addition, one must fully realize what boundaries of motion are physically capable, and ensure that their sensor placement allows for full ROM measurement.

The following are requirements for sensor placement:

  1. Sensor placement does not hinder normal human motion
  2. Sensor placement gives accurate representation of motion desired
  3. Sensor readings are not affected by external factors (skin, bumps, etc)
  4. Sensor placement allows for complete range of motion measurements (is not limited to 30 degrees out of a possible 50 degrees, for example).

In this case, it is also necessary to consider several parts of the human body when researching placement and kinematics, with joints of interest including:

  1. Spine: Lumbar region: Sacrum-L1/L2-L3/L4/L5
  2. Arm: Shoulder-Elbow-Wrist
  3. Leg: Hip-Knee-Ankle

Step 2. Search Externally

1) From a PDF by Van Herp, Rowe, Salter, and Paul utilizing the Polhemus 3Space System (Available on EDGE): information on Lumbar/Spine Kinematics

a study of range of movement in 100 healthy subjects aged 20 to 60+ years.



2) From a PDF: Rosen, Perry, Manning, Burns, Hannaford- available on EDGE. Team used a Vicon MT System to capture data, CAD SW to model, and Dynamics SW to derive Euler equations of motion.

During Daily Activities Toward a 7 DOF Upper Limb Powered Exoskeleton



3) From PDF: Kinematic Analysis of Lumbar Spine Undergoing Extension and Dynamic Neural Foramina Cross Section Measurement. By: Yongjie Zhang1, Boyle C. Cheng2, Changho Oh1, Jessica L. Spehar2 James Burgess3 Available on Edge



4) From PDF: Reduced kinematic model of the human spine. By:Christian Simonidis, Manuel Scharmacher, and Wolfgang Seemann.




Step 3. Search Internally

Of the prior RIT MSD projects focusing on motion tracking:




Step 4. Explore Systematically

Specifications of Interest:

Step 5. Reflect on the Results and the Process

Generate Product Concepts