For instance, let's consider the sine wave, or sinusoid, a mathematical function that describes a smooth repetitive oscillation.
例如，让我们考虑一下正弦波，也即正弦曲线这样一个描述平稳反复振荡的数学函数。
2
The bridge was actuated by sinusoid sweeping frequency wave, and then the power spectral density differences between the undamaged and damaged bridge were analyzed.