Structural Health Monitoring Pertaining to Critical Aircraft Structural Components

2010 ◽  
Author(s):  
Wing K. Chiu
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Structural Components ◽  
Structural Health

Reliability of crack quantification via acousto-ultrasound active-sensing structural health monitoring using surface-mounted PZT actuators/sensors

2020 ◽  
pp. 147592172092153
Author(s):  
Susheel Kumar Yadav ◽  
Spandan Mishra ◽  
Fotis Kopsaftopoulos ◽  
Fu-Kuo Chang
Keyword(s):  
Wave Propagation ◽  
Structural Health Monitoring ◽  
Sensor Network ◽  
Health Monitoring ◽  
Active Sensing ◽  
Structural Components ◽  
Network Configuration ◽  
Structural Health ◽  
Damage Quantification ◽  
Propagation Paths

This work presents the introduction and experimental investigation of an active-sensing acousto-ultrasound structural health monitoring approach for damage size quantification based on piezoelectric sensors/actuators mounted on multiple seemingly identical structural components. The objective of this work is to determine how reliable the damage diagnostics can be from one component to another similar (nominally identical) component using surface-mounted PZT (lead zirconate titanate) sensors/actuators, and also to evaluate how sensitive a sensor network configuration in terms of the number of sensors/actuators is with respect to its detection reliability. Extensive crack growth experiments on multiple identical coupons outfitted with the same sensor network configuration under cyclic loads were conducted to assess the damage quantification reliability from one coupon to another using the same diagnostic algorithm. The results of the study indicate that the crack size estimates obtained from the active-sensing structural health monitoring system can vary within the population of identical structural components (coupons), but the difference in quantifying damage among coupons decreases with the increase in the number of sensors and actuators used, that is, wave propagation paths. Furthermore, it is shown that the diagnostic results in terms of damage quantification converge with the increase in the number of sensors. The results of the study indicate that the diagnostic approach using a multi-path sensor network can reduce the damage quantification error from one component to another within a “hotspot” configuration (damage location is known or suspected a priori). Finally, the results of this study indicate that the more wave propagation paths used in the diagnostic active-sensing algorithm, the more reliable the damage quantification results are, provided that the same sensor network is used and installed at nominally identical locations for all coupons.

Strain-Based Condition Assessment of a Suspension Bridge Instrumented with Structural Health Monitoring System

2016 ◽  
Vol 16 (04) ◽  
pp. 1640027 ◽  
Author(s):  
Yi-Qing Ni ◽  
Yun-Xia Xia
Keyword(s):  
Structural Health Monitoring ◽  
Monitoring System ◽  
Health Monitoring ◽  
Limit State ◽  
Condition Assessment ◽  
Structural Members ◽  
Structural Components ◽  
Health Monitoring System ◽  
Structural Health ◽  
Structural Health Monitoring System

Strain provides information about local behavior of structural components, and is one of the most concerned parameters in the structural health monitoring (SHM) of civil structures. It plays an important role in the condition assessment of bridges in terms of fatigue or yielding of the structural material, safety reserve or reliability of structural components, etc. The Wind And Structural Health Monitoring System (WASHMS) deployed on the suspension Tsing Ma Bridge (TMB) in Hong Kong has hitherto operated continuously for 17 years. As part of the WASHMS, 110 strain gauges were installed on the bridge to measure the dynamic strain response of the TMB. Based on the strain measurement data acquired in 2012, the structural condition of the TMB is evaluated by addressing the following issues: (1) Evaluation of the characteristics of stress responses in structural members on different deck cross-sections and comparison with the results obtained in 1999. (2) Statistical analysis of daily maximum stresses in different members and comparison with the design values (designated stresses) due to live loads at both serviceability limit state (SLS) and ultimate limit state (ULS). (3) Evaluation of the inner forces of monitored structural members and the corresponding strength utilization factors (SUFs). The assessment results obtained in the present study can be used as a reference or guideline for scheduling the bridge inspection and maintenance activities.

Structural Health Monitoring Algorithm for Composite Plates using Lamb Wave Response Measured by Piezo Transducers

2019 ◽  
Author(s):  
Luis Eduardo Jaramillo Bustamante ◽  
Edison jair Bejarano sepulveda ◽  
Volnei Tita ◽  
Marcelo Leite Ribeiro
Keyword(s):  
Structural Health Monitoring ◽  
Health Monitoring ◽  
Lamb Wave ◽  
Composite Plates ◽  
Structural Health ◽  
Wave Response ◽  
Monitoring Algorithm
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