時間・周波数領域情報を利用した歯車の動的性能評価法(機械要素,潤滑,工作,生産管理など)

概要

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The wavelet transform (WT) is a method for the time-frequency analysis of signals. It is possible to detect the change in each frequency through a sampling period by the WT. In this study, in order to discuss an evaluation method for the gear dynamic performance using the time-frequency analysis, the dynamic performance of both sintered and steel gears were measured using a power circulating gear testing machine in the range of the rotational speeds of 1600 to 10000 rpm. The measured signals of dynamic performance, which are tooth root strain, vibration and sound of gear box, were analyzed in the time-frequency domain by the continuous WT based on the Gabor function, and the signals of the dynamic performance were decomposed and reconstructed by the discrete WT based on the cardinal B-spline function. The validity on the new evaluation method using both continuous and discrete WTs was discussed. The dynamic performance can be divided between two frequency regions over and under the tooth mesh frequency fz. Consequently, it was clarified that the dynamic performance over the fz indicated the condition of the torsional vibration of gear system, and the dynamic performance under fz depended on the rotational speed of gear.
2003-02-25