Fundamental Investigation of an Oil Damper : 1st Report Case of Its Analysis as Steady Flow

概要

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The authors investigate the generating mechanism of a damping force in an oil damper. Its damping is caused by the oil flow in the annular cross-section clearance between cylinder and piston. A theoretical research on damping mechanism was done, assuming for mathematical simplification that the oil stream is a steady, laminar flow. Besides above assumption, various assumptions are set up for the analysis. Therefore the resulting calculus of damping is an approximation, but it has better accuracy than the previous one being used up to the present day. The practical oil damper is generally used in oscillating state, so the oil stream is unsteady. Theoretical results, however, agree well with the experimental values, as far as λ=h√<ω/2υ> is less than 2,where h, ω and υ are radial clearance, circular frequency and kinematic viscosity, respectively. Consequently, it is found that the present analysis is valuable for this type of the oil damper.
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