静圧気体軸受の減衰特性の一次元モデルによる解析 : 第1報, 2個の給気孔絞りを有する軸受の減衰特性

概要

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For the purpose of developing a gas bearing with the highest possible damping, we clarify the damping characteristics of a one-dimensional gas bearing model in relation to the squeeze number, feeding port area, restriction type and land width. The bearing has static stiffness K_<st> at zero squeeze number and dynamic stiffness K_<dy> at infinite squeeze number. Between zero and infinite squeeze numbers, we find that the damping becomes negative if K_<st> is larger than K_<dy>, and that the maximum damping is proportional to K_<dy>-K_<st>. We also find that K_<dy> is proportional to the static pressure. Thus, in order to increase damping, it is most effective to increase the feeding port area for both increasing the bearing static pressure, i. e., K_<dy>, and reducing K_<st>. A simple approximated formula to predict the maximum damping and associated optimal squeeze number is proposed. The limit of the potential damping ratio of gas bearings is also discussed.
社団法人日本機械学会の論文
1992-07-25