In this paper a model of the equivalent linear spring is proposed for approximately calculating fundamental frequencies of a vibrating shaft with an arbitrary crack.
利用等效线弹簧模型近似计算了含裂纹转动轴的自由振动基频。
As the name suggests, mixers produce output signals with mixed frequencies and are fundamental components of many electronic communications systems.
顾名思义，晶体管常用作混频器，可以输出混频信号，并且是许多电子通讯系统的基本元件。
The chords the students liked best have frequencies with that harmonic relationship, too - all the frequencies are integer multiples of a common fundamental frequency.
大学生们喜爱的和弦也都有着最好的谐振关系——所有的谐振频率都是一个常见基频的整数倍数。
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