A Proposal of Optimum Groove Design Concepts of Spiral-Grooved Journal Bearings Applied to Spindles of Precision Equipments (2nd Report, A Guide for Reduction of Amplitude of Indicial Response)

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  • 精密機器スピンドル用スパイラル溝付ジャーナル軸受の溝諸元の最適化に関する一考察（第２報，衝撃応答変位低減のための指針）
  • 2nd Report, A Guide for Reduction of Amplitude of Indicial Response
  • 第2報, 衝撃応答変位低減のための指針

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Optimum designs of the groove dimensions of spiral-grooved journal bearing applied to the spindle of precision equipments are discussed in the course of the study, and the NRRO (non-repeatable run-out) characteristic of the bearing is focused in this paper. The NRRO is formulated as an indicial response of the rotor against an external impulse load, so that three kinds of evaluation indices, i.e., “maximum displacement Emax”, “displacement integration Σ” and “displacement composition Ec”, are introduced to evaluate the characteristics of the indicial response of the rotor. The optimum values of groove parameters are calculated through minimization of each evaluation index value. The performances for the bearings with the obtained groove dimensions are examined, concluding that the groove design according to the “minimizing Ec” criterion is recommendable rather than that to the conventional “maximizing Kxx” criterion.

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