铸件固化过程中声发射信号的波幅分布分析[印度]M.Manoharan 等从含硅11.6%的铝合金铸件(带气孔和不带气孔)中发射出的声音在其固化过程中进行了监控。并将所得到的信号放大后输入 Logan 声发射鉴别/分析器。在Logan 屏幕上显示出来的波幅分布情况用电影摄影机以每秒6个片格的速度拍成照片。诸如平均偏差、标准偏差、失真和波幅分布的突出度等统计参数进行了计算,并画出了它们与时间的关系图,从而显示带气孔和不带气孔铸件的变化值。波幅的时间系列的自动校正分析表明:相应于带气孔(C1=0.25,滞后 j(分钟)=1～2)和不带气孔(C1=0.967,滞后 j(分钟)=5～7)的铸件的自动校正函数的第一个最小值的第一个自动校正系数 C1和滞后 j 值的变化范围极大。单边度组件 jenkins 模式程序表明,来自不带气孔的铸件的声发射完全是不规则的,而来自带气孔的铸件的声 Vibration Distribution of Acoustic Emission Signals During Casting Cure [India] The sound emitted by M. Manoharan et al. From 11.6% aluminum alloy castings containing silicon (with or without porosity) was monitored during curing. The resulting signal is amplified and fed to a Logan Acoustic Emission Discriminator / Analyzer. The distribution of the amplitude shown on the Logan screen takes a picture with a movie camera at 6 frames per second. Statistical parameters such as mean deviation, standard deviation, distortion and distribution of amplitude distribution were calculated and plotted against time showing the change in values ​​for porosity and non-porosity castings. Autocalibration analysis of the time series of amplitudes showed that the castings corresponding to those with pores (C1 = 0.25, hysteresis j (min) = 1 ~ 2) and without pores (c1 = 0.967, hysteresis j The first auto-correction function of the first minimum value of the first auto-correction coefficient and lag j values ​​vary greatly. The jenkins mode procedure for unilateral components shows that the acoustic emission from the castings without pores is completely irregular and the sound from the castings with pores