Coefficient of Dynamic Friction Via Analog Computer Data Reduction

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Abstract
This paper describes a technique to determine the effective coefficient of dynamic friction from experimental data. The experiment consists of a rod that is being inserted in a test vessel which is subjected to a sinusoidal vibration input. The rod is impacted by three bushings. The actual impact forces are measured with three strain bolts per bushing. These nine impact forces, as well as rod position, are recorded continuously on an FM magnetic tape for playback and analysis. The data reduction is performed on an analog computer. All pertinent forces affecting vertical rod motion, i.e. gravity, fluid drag, buoyancy, and friction, as well as rod position and velocity, are included in this simulation. The end result of the analysis is the value of the effective coefficient of dynamic friction during a sinusoidal excitation. The analysis is straightforward and based on first principles. Results to date show excellent repeatability and accuracy.

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