Structural Health Monitoring


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Structural Health Monitoring

  2. 2. Contents: Definition… What is SHM? Pattern of SHM Importance of SHM Components Conclusion.
  3. 3. Structure:
  4. 4. Types:
  5. 5. Damages Due to: mismanagement in construction, lack of quality in control, temperature conditions…… Damages such as surface cracks, segregation, settlements etc…
  6. 6. Damage: Changes in:  geometric properties ,  boundary conditions ,  system connectivity… which adversely affect the structure’s performance.
  7. 7. What should we do?
  8. 8. In 19th Century: rail road wheel tappers - used the sound of a hammer when striked against the wheel of train to detect the damage. In rotating machinery, vibration monitoring is used as performance evaluation technique.
  9. 9.  Then, these techniques are utilized to detect the damages in the structure, and then a new field emerged namely Structural Health Monitoring.
  10. 10. What is Structural HealthMonitoring? The process of implementing a damage detection and characterization strategy for engineering structures is referred as Structural Health Monitoring. (in short…)
  11. 11. Pattern of SHM: Operational Evaluation, Data Acquisition and Cleansing, Feature Extraction & Data Compression, and Statistical Model Development for Feature Discrimination
  12. 12. Operational Evaluation:  Under which operations, the structure services and damage.  Life safety and economic justification for performing SHM.  Limitations of acquiring data in SHM.
  13. 13. Data Acquisition:  This parts deals with:  number of sensors,  types of sensors,  selecting their excitation methods &  data storage techniques.
  14. 14. Data Normalization: separating changes in sensor readings from damage to those caused by varying operational & environmental conditions.
  15. 15. Feature Extraction: Feature extraction gives the technical literature to distinguish between damaged and non damaged items of buildings.
  16. 16. Statistical ModelDevelopment: Statistical Model Development is used for determining damaged and undamaged structures.
  17. 17. Importance of SHM: SHM improves - safety & functionality of structures. Monitoring - develop innovative design methodologies - timely warning of impending failures. Structural condition monitoring and assessment are required for timely and cost-effective maintenance.
  18. 18.  Embedment of sensors during construction and measurement of structural responses during service will enable condition assessment and remaining life estimation easy and convenient Monitoring scheme helps to gather data on the realistic performance of the structures, which in turn will help to design better structures for the future.
  19. 19. Saptha Suthras: All materials have inherent laws or defects The assessment of damage requires a comparison between two system states Identifying the damage differs than the type and vulnerability of the damage, which requires skill.
  20. 20.  Sensors cannot measure damage. Feature extraction and statistical classification is required to convert sensor data to damage information. Damage information depends upon the intelligence of sensor’s feature extraction.
  21. 21.  There is a trade-off between the sensitivity to damage of an algorithm and its noise rejection capability. DS α 1/RE (damage size) α (1/ frequency range of excitation)
  22. 22. Components: Structure Sensors Data acquisition systems Data management Data transfer Data interpretation and diagnosis
  23. 23. Why SHM?
  24. 24. Sensors: Sensors measure the physical quantity of damage and sends it to computer. Good Sensor :  Is sensitive to the measured property  Isinsensitive to any other property likely to be encountered in its application  Does not influence the measured property.
  25. 25. DA systems: Data acquisition is the process of sampling signals that converts the resulting samples into digital numeric values.  Sensors  Signal conditioning circuitry  Analog-to-digital converters
  26. 26.  Data management system manipulates the management of data obtained from sensors. Data transfer systems are used to transfer the data to systems which help in predicting the failures of structures.
  27. 27. SHM monitoring for a dam in China:
  28. 28. Conclusion: There is always no particular conclusion for any technology related concept. But, this concept ends with conclusion with that even structures have life and we (civil engineers) are here to protect it from various diseases.
  29. 29. Thank you...