Exercise 32

Scoring Kinematics

The file e31data.txt contains Optotrak measurements of a single-joint elbow rotation over time. The angle between the upper and lower arm (in radians) was sampled at 200 Hz. Here is a plot of the data file:


Answer the following questions about the data. Use whatever signal processing techniques you wish, to answer each question. Explain the signal processing steps you took, and why.


Determine the angle (in degrees) that the elbow rotated over the course of the arm movement.


Determine the peak velocity, in radians per second, of the elbow movement. Hint: use the gradient() function to compute the central difference so you don't introduce a time lag and so the derivative has the same number of elements as the position array.


Determine the peak positive and peak negative accelerations, in radians per second per second.

Paul Gribble | fall 2014
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