On July 1, 2022,

Qingcheng Acoustic Emission Research (Guangzhou) Co., Ltd. was invited by a research institute to conduct a full-size cable loading and wire breaking experiment on the cable (hanger) produced by a cable factory and the actual bridge hanger with 1:1 production.  The two-week full scale test of acoustic emission detection for broken wires of bridge cables was successfully completed with remarkable results. Experimental data show that RAEM1 can be unattended and remote automatic monitoring of broken wires to ensure that no single broken wire is missed, and can automatically push broken wires and the rate of broken wires to mobile phones and mailboxes. 

• Bridge special sensor installation:

• RAEM1 Internet of Things Acoustic Emission Collector:

• RAEM1 Principle of Iot Acoustic Emission System：

• Qingcheng Internet of Things platform to check the broken wire data:

Some experimental results:

	断丝序号	断丝时间 （年-月-日 时-分-秒.毫秒）	能量 （kPj）	振铃计数	累计断丝根数	断丝率	监测报警准确率
实验1	1	2020-07-01 10:19:28.002	11986	175	8	6.01%	100%
	2	2020-07-01 10:19:56.264	17502	209
	3	2020-07-01 10:20:23.310	15702	193
	4	2020-07-01 10:20:30.589	11501	187
	5	2020-07-01 10:20:35.842	22272	211
	6	2020-07-01 10:20:54.539	13748	199
	7	2020-07-01 10:20:03.479	13455	192
	8	2020-07-01 10:20:14.212	15446	187
实验2	1	2020-07-01 10:31:16.511	14311	183	17	12.78%	100%
	2	2020-07-01 10:31:36.324	26892	213
	3	2020-07-01 10:31:48.274	10186	190
	4	2020-07-01 10:31:53.430	17032	209
	5	2020-07-01 10:31:56.521	13325	187
	6	2020-07-01 10:32:00.881	22072	204
	7	2020-07-01 10:32:08.468	14983	195
	8	2020-07-01 10:32:10.541	29296	224
	9	2020-07-01 10:32:27.976	18101	205
实验3	1	2020-07-01 10:47:46.621	15926	182	26	19.55%	100%
	2	2020-07-01 10:48:05.754	14360	196
	3	2020-07-01 10:48:07.765	15337	206
	4	2020-07-01 10:48:12.710	14609	192
	5	2020-07-01 10:48:16.878	20007	247
	6	2020-07-01 10:48:18.385	14429	230
	7	2020-07-01 10:48:57.937	12278	176
	8	2020-07-01 10:49:11.875	15527	204
	9	2020-07-01 10:49:19.881	24730	226

• Wire breaking and wire breaking rate alarm push:

• Email alarm push:

• SMS alarm push:
  
   

Conclusion:  

The acoustic emission signal of broken wire has high amplitude, high energy, high ring count, high RMS and obvious characteristics, which can be distinguished from most noise signals.  The data and results of this experiment show that acoustic emission testing can effectively detect the phenomenon of broken wires.  The data and results of this experimental study also prove that the RAEM1 iot acoustic emission monitoring system can accurately and effectively monitor the phenomenon of wire breakage, and the 100% accuracy of the experimental data of wire breakage has no missing report.  RAEM1 can be unattended remote automatic monitoring of broken wire, so as not to miss a single broken wire phenomenon, and can automatically push broken wire and broken wire rate to mobile phone and email.  

The experimental data show that the energy and RMS value of the broken wire signal at the anchor head are much larger than that at the casing.  The data show that a single sensor installed at the unjacketed anchor head position can effectively detect wire breakage throughout the cable.