This paper proposed classificatory method based on sonic testing and probabilistic neural network(PNN),it realizes classification between different hardness.
同时提出基于音频检测与概率神经网络的分类方法,实现了不同零部件的硬度分类。
参考来源 - 火炮零部件硬度智能无损检测系统研究·2,447,543篇论文数据，部分数据来源于NoteExpress
This paper studied mathematical mould and vibration curve, it used vibration analysis and mathematics and physical method, and used sonic testing of axles, too.
本文利用振动分析理论和数学物理方法对音频检测轴类零件的数学模型和振型曲线进行研究。
Soil: investigation and testing - Auscultation of foundation elements - Part 1: sonic core test.
土壤：调查和试验。基本元素听诊法。第1部分：声芯试验。
Instead of the sonic nozzle, low supersonic nozzles have been utilized to solve the choking problem in transonic wind tunnel testing of high angle-of-attack and high blockage.
本文介绍用低超声速喷管代替声速喷管，解决了大迎角大堵塞度跨声速实验时的风洞壅塞问题。
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