探测精密零部件加工裂纹的声发射实时监测仪

Acoustic emission real-time detecting instruments for metal cracks in machining exact details

为了提高航天航空精密零部件加工设备的可靠性、安全性,缩短研制周期,提出了一种实时监测精密零部件加工过程产生裂纹的方法,并根据此方法,研制了一台基于TI公司最新浮点数字信号处理器—TMS320F28335的精密零部件裂纹实时监测仪的样机。考虑在线实时监测的需要,采用了基于声发射(AE)技术的方案。介绍了裂纹实时监测方法的总体方案及其相应系统的硬件组成,描述了数字信号处理算法,并对裂纹实时监测仪样机进行了试验验证。试验结果显示,研制的样机能达到无漏检,误检率为1.2%,验证了本文所提方法的有效性。

To improve the reliability and security of maching exact details in space equipment and to shorten their developing periods,a real-time detecting method for the metal cracks in machining exact details was presented.According to this method,a prototype machine of real-time detecting instrument for the cracks of exact details based on a float digital signal processor—TMS320F28335 was developed.In consideration of online real-time detecting,the Acoustic Emission（AE） technique was adopted in the method.The general scheme for detecting metal cracks in real time was introduced and the hardware composition and software algorithm corresponding to the system were analyzed in detail.Finally,the verification experiments to the prototype machine of real-time detecting instrument were carried out.The experimental results show that the prototype machine has high performance.Its false detecting ratio reaches 1.2% and has no missing cracks,which validates that the AE real-time detec-ting method for the crack detecting is efficiency.