frequency ratio a的意思|示意

The natural frequency, damping ratio and mode shape of a multi-degree-of-freedom system are analyzed and the identified results are in good agreement with the theoretical values.

并针对一多自由度系统具体论述了固有频率、阻尼比和振型的识别方法，识别结果与理论结果吻合较好。

The relation between ratio of peaks and degree of defect is worked out, then a method of quantity analysis in frequency domain is .

根据这一特征，得到小峰与大峰之比与缺陷程度之间的关系曲线，提出利用导纳曲线进行缺陷量化分。

It introduces a digital cymometer which has the functions of frequency measuring, pulse cycle measuring, pulse width measuring and pulse signal ratio measuring.

介绍了具有频率测量、脉冲周期测量、脉冲宽度测量以及脉冲信号占空比测量等功能的数字频率计。

To improve beamforming under low signal-to-noise ratio, a method based on stochastic resonance(SR)in a bistable model is investigated by using a frequency scale transformation method.

为了改善低信噪比下波束形成的性能，从双稳态随机共振模型出发，提出了利用频率尺度变换，将随机共振和波束形成结合起来的算法。

Simulations show that the scheme gives a signal-to-noise ratio (SNR) improvement of about 0.4 dB over a frequency-selective fading channel compared with PN sequence padding.

仿真表明，在频率选择性信道下误符号率较PN序列填充方案有0.4 dB左右的性能改善。

It shows that the modal shape and mode frequency are highly coupled with the VIV response of a Marine riser with low mass ratio.

该模型的计算结果表明，立管的模态振型、模态频率与涡激振动响应高度耦合，并且对于低质量比的情况尤为明显。