This paper studied mathematical mould and vibration curve, it used vibration analysis and mathematics and physical method, and used sonictesting 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。
2
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。
3
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.