摘要
采用声发射技术对电梯钢丝绳拉伸过程进行监测,获取钢丝绳断丝信号,并对断丝信号进行参数分析和波形分析.试验结果表明:声发射检测技术能很好地定性辨识断丝信号.断丝信号具有高幅值高能量的特点,信号幅值在80～100 dB之间或绝对能量在2×106 mV·s以上的信号可定性认定为断丝信号.通过对具有这些特征的信号进行统计,可对钢丝绳断丝情况定量计算,从而推断出钢丝绳的剩余强度.钢丝绳断丝信号为突发型信号,对信号进行快速傅里叶变换可得知断丝信号的频率主要分布在0～220 kHz之间,且在25～50 kHz之间有明显的能量峰值.
In this paper,acoustic emission technique was used to monitor the elevator wire ropes in tensile test.Following both parameter analysis and waveform analysis for the broken wire signals,it was found that acoustic emission detection technology could be used to identify broken wire signals qualitatively.Broken wire signals have characteristics with high amplitude and high energy,and those signals with amplitude between 80 dB and 100 dB or absolute energy beyond 2 × 106 mV · s can be qualitatively identified as broken wire signal.Signals with these characteristics can be quantitatively counted to evaluate the operation situation of wire ropes and then deduce the residual strength and life of wire ropes.Broken wire signal is a kind of burst-type signal.Through fast Fourier transform,it is seen that the frequency of broken wire signals are mainly distributed in the scope from 0 to 220 kHz,and there are distinct energy peaks at the frequency range from 25 kHz to 50 kHz.
出处
《无损检测》
2014年第1期71-73,83,共4页
Nondestructive Testing
基金
陕西省科学技术研究发展计划资助项目(2012K0622)
