The sonic signature needs to keep the treble detail, but increase the frequency spectrum and add a more full sound.
声音特色方面，要保持高音的细节，但增加频响宽度，增加更多的饱满的声音。
2
Sonic loading is a high frequency, broadband random process. Basic cycle counting methods, which are prevalently used in time domain, are difficult to be applied.
噪声载荷是一种高频、宽带随机载荷，在低循环疲劳寿命预测中被广泛采用的时域计数法很难直接利用。
3
The paper introduces a kind of sonic method by which frequency of impacter is measured.