rotation n. 1.旋轉(zhuǎn);輪轉(zhuǎn);循環(huán)。 2.【天文學】自轉(zhuǎn)。 3.【物理學】旋度。 4.輪流,輪換;交替。 5.【農(nóng)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(shù),出現(xiàn)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(dǎo)致產(chǎn)生與光盤轉(zhuǎn)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(zhuǎn)頻率無關(guān)的干擾,提取與工作狀態(tài)直接相關(guān)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(yīng)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(luò)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。