24th & 25th May 2018 – Senskin - Istanbul

Structural Health Monitoring with AE

Summary

• Introduction to Mistras

• Structural Health Monitoring Systems (SHMS)

• Acoustic Emissions (AE) summary

• Monitoring for wire breaks

• Conclusions

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About MISTRAS

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Mistras European Offices

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www.mistrasgroup.co.uk

About MISTRAS

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Technologies - Structural Health Monitoring Systems

• 2, 4, 8, 16, 32, 56, 64, 128 and 256 independent channel systems• <100Hz sample rate• Various IP rated cabinets • Virtually any sensor – AE, strain, vibration, tilt, displacement, weather station, GPS etc• Integration of IP systems and total stations/GPS • Long cable lengths, 1km+ (4-20ma current loop)• Power solutions (fuel cell/hybrid diesel/solar)• Remote wireless networks (4G/3G enabled/Satellite broadband) • Temperature correction (software)

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4 sensors

8 < 32 sensors

32 < 256 sensors

<56 sensors

Technologies - Structural Health Monitoring Operation

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Acquisition• Normal operation – SHMS and AE• Automatic wire break detection• High SHMS speed trigger file operation• Stress analysis• Viaduct bearing monitoring function & structural computation (e.g. buckling)

Data Transfer• Conventional network (CAT6e, FO), DSC or SCADA (Modbus RS-232, RS-485 or TCP/IP) • Remote wireless networks (4G/3G enabled/Satellite broadband)

Data Storage• Local servers ASCI and SQL databases• Web based cloud data storage service

Data Analysis / Process• Noesis / SMS-R / SQL query

Data Visualisation• SCADA dash board interface / Web interface

SHM data in ASCI table

Cloud based results

Wire Break Problem

Hidden defect, requiring invasive inspection or non-invasive technique

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Acoustic Emission Summary

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Wire Break Research and Validation

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Full scale instrumented cable in environmental chamber

Mistras Sensor Highway monitoring system

Integrated AE and Structural Health Systems on Suspension Bridges

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Structural Monitoring Cloud – Real Time Results

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Structural Monitoring Cloud – Real Time Results

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Mistras AE and SHM System Verification

23rd June 2008- Unwrapping of cable and removal of circumferential wrap- 900mm wire wrapping removed from 1150mm to 2050mm above CB10- Shift finishes, workers leave site

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Cable after opening

Mistras AE and SHM System Verification

23rd June 2008- Unwrapping of cable and removal of circumferential wrap- 900mm wire wrapping removed from 1150mm to 2050mm above CB10- Shift finishes, workers leave site- Mistras AEM system automatically detects wire break on 23/06/08 22:39:41hrs at 1151.17m

downstream, 1480mm from cable clamp CB10 towards cable clamp CB9D

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Wire break signal at first sensor

Wire break automatically located on the main cable

24th June 2008- Inspection of unwrapped cable found additional wire broken 23R at 1420mm

from CB10 at 1151.11m on cable length

- Location verified to within 60mm of MISTRAS AEM system calculated location

Mistras AE and SHM System Verification

© Mistras 2018 Broken wire found at the start of the shift

Automated wire break location

Conclusion

• Acoustic Emission as SHM is a very effective technique for detecting hidden defects

• The AE application for wire break detection is very mature now, with Mistras detecting over 1,400 wire breaks (to date) over 93 cumulative years of monitoring

• When properly specified, installed and maintained SHM systems can be functional in excess of 20 years+

• AE and structural health monitoring is a powerful tool for bridge owners to assist in asset management and safe operations

SHM installation on Humber Suspension Bridge main cable

© Mistras 2018

24th & 25th May 2018 – Senskin - Istanbul

Structural Health Monitoring with AE