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- Wavelet packet analysis and Welch method has been advanced todelicately analysis the time-frequency characteristics of arc sound. 通过小波包多层分解与Welch平均法对电弧声信号进行了精细化的时频域分析。 结果表明：电弧声功率谱分布具有一定的规律性，并且不同频段谱峰值及其对应频率与焊接飞溅相关。
- Keywords SVM welding arc sound;LPC model;shield gas flux; 支持向量机;电弧声;LPC模型;保护气体流量;
- Joan of Arc was one of France's greatest daughters. 圣女贞德是法国最伟大的女性之一。
- PARAMETRIC MODELING OF THE ARC SOUND IN GMAW FOR ON-LINE QUALITY MONITORING GMAW电弧声的参数化模型及应用
- A sound mind is inseparable from a sound body. 健全的精神是与健康的身体是不可分割的。
- Alarmed at the first sound, we hit the dirt. 第一声警报一响我们就迅速卧倒。
- Joan of Arc was burnt (alive) at the stake. 圣女贞德在火刑柱上被(活活)烧死。
- He has told a story which sound not objective. 他讲了听起来不真实的一个故事。
- Joan of Arc was made a saint in 1920. 1920年，贞德被追封为圣女。
- I caught a curious sound in the neighboring room. 我听到隔壁房间里有奇怪的响声。
- I was awakened by the sound of church bells. 我被教堂的钟声吵醒。
- The sun appears to move in an arc across the sky. 太阳看起来在天空以弧线运行。
- The sound of danger gives wings to his flight. 危险的信号加速了他的逃跑。
- I quivered with fear at the sound. 我听见那种声音就吓得发抖。
- Her mouth open and shut, but no sound come out. 她的嘴张开又闭上了，没有发出声音。
- I have got accustomed to noisy sound. 我已习惯于嘈杂声音。
- The bell gave forth a peasant, lingering sound. 钟奏起了悠扬悦耳的曲调。
- He was a man with a sound constitution. 他是个体质强健的人。
- Joan of Arc led a large army to raise the siege of Orleans in1429. 贞德在1429年率大军解除了英军对奥尔良的围攻。
- They have got home safe and sound. 他们已平安到家。
