rotation n. 1.旋轉;輪轉;循環(huán)。 2.【天文學】自轉。 3.【物理學】旋度。 4.輪流,輪換;交替。 5.【農業(yè)】輪作;【林業(yè)】輪伐(期)。 by [in] rotation 輪換,輪流。
frequency n. 1.屢次,頻仍,頻繁。 2.(脈搏等的)次數,出現率;頻度;【物理學】頻率,周率。 audio frequency音頻。 a high [low] frequency高[低]頻。 the frequency of earthquakes in Japan 地震在日本的頻繁發(fā)生。 mean [median] frequency中頻。 resonance [resonant] frequency諧振頻率,共振頻率。 ultrahigh frequency超高頻。 ultralow frequency超低頻。 very high frequency甚高頻。 very low frequency甚低頻。
In dvd focus servo system , the warp of the disc induces periodic disturbance whose frequency is same as the rotation frequency of the disc 摘要在dvd聚焦伺服系統(tǒng)中,光盤翹曲會導致產生與光盤轉動頻率相同的周期性擾動。
Time domain synchronous averaging can reduce the signal not coherent to rotation frequency effectively , and extract the repetitive signals directly related to machine operation condition 而時域同步平均可以有效衰減與回轉頻率無關的干擾,提取與工作狀態(tài)直接相關的周期信號。
We apply the continuation theorem to the dnls equation and prove that when the damping force 6 and the driving force h satisfy h > , the discrete multibreathers with the rotation frequency exist , where > 然后將此定理應用于高維dnls方程,證明了當阻尼和外力h滿足h時,存在頻率為的離散多重呼吸子,其中。
The ship radiated noise is analyzed and its 4 features are extracted from the envelop spectrum . the envelope of ship noise waveform can be demodulated utilizing hilbert transform , and the spectrum components with line rotation frequency of propeller shaft are extracted effectively by bispectrum , 1 ( 1 / 2 ) spectrum and 2 ( 1 / 2 ) spectrum analysis 對于通過希爾伯特變換解出的艦船輻射噪聲包絡信號進行高階統(tǒng)計量分析,有效地提取出了艦船噪聲的雙譜、 11 / 2維譜、 21 / 2維譜等方面的特征。