Sports Biomechanics Lab > Blog > Torsional Pendulums!
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Torsional Pendulums!

by Jason Moore — last modified Dec 03, 2009 06:00 PM

We are measuring the mass locations and mass distributions of our instrumented and actuated bicycle and have started building a torsional pendulum.

Derek, one of our undergraduate lab assistants, is making super progress on a fixture that we will use to mount a torsional pendulum and compound pendulum for measuring the centers of mass and moments of inertia of the instrumented bicycle. He used some random 80/20 material that was left over from the old baseball pitching machine and made a nice stout fixture that can be mounted to a structural pole in the lab. The measurements will be very similar to Jodi Kooijman's thesis and the similar work I did with Jodi at Delft.

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The fixture was designed to be stout and the 80/20 allows for easy modularity, assembly and disassembly (plus it was free!)

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It turned out to be nice and strong. We don't want and vibrations in the frequency range of our measurements.

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We also checked out the possibilities of connecting our lab to the old bicycle biomechanics lab next door. We are going to do our best at getting a door put in the wall. That way we can have easy access to the tools and treadmill next door.

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