オイルダンパにおける油の圧縮性の影響について : 第2報, 理論解析の概要と実験的検討

概要

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The working fluid of the oil damper is usually treated as an incompressible fluid. However, it becomes clear that the damping coefficient of the oil damper is strongly dependent on the impressed frequency. The primary reason is considered to be the effect of compressibility of oil, including the compressibility of air melting in it. The influence of the inertia force of oil on the frequency characteristics is too small to cause the drastic change of the damping properties. We have already proposed an expression for a viscous oil damper by considering the compressibility of oil. The theoretical expression is still not verified by the experiments. According to our theoretical study, the effects of compressibility appear in the high frequency level (more than a few hundred hertz). In such a frequency level, it is difficult to measure the damping force with a high accuracy. In this paper, we perform an experiment with a new device. It was obvious from the experimental work that the frequency characteristics of the viscous oil damper were well explained by our expression.
社団法人日本機械学会の論文
1998-05-25