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在大量试验和频谱分析的基础上，从功率谱、倒频谱和自相关函数的测量中确立了２７个理论诊断参数，用以诊断滚动轴承内、外圈和钢球表面的波纹度。
Based on a large number of experiments and spectrum analysis, 27 theoretical diagnostic parameters were established from the measurement of power spectra, cepstrum and autocorrelation functions to diagnose the waviness of the inner and outer rings of the rolling bearing and the surface of the steel ball.