In this paper a model of the equivalent linear spring is proposed for approximately calculating fundamentalfrequencies 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。
2
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。
3
The chords the students liked best have frequencies with that harmonic relationship, too - all the frequencies are integer multiples of a common fundamental frequency.