Non-Contact Damage Detection under Operational Conditions with Multipoint Laservibrometry

Statistical Damage Classification under Changing Environmental and Operational Conditions

Stated in its most basic form, the objective of damage diagnosis is to ascertain simply if damage is present or not based on measured dynamic characteristics of a system to be monitored. In reality, structures are subject to changing environmental and operational conditions that affect measured signals, and environmental and operational variations of the system can often mask subtle changes in ...

Impact Damage Localisation with Piezoelectric Sensors under Operational and Environmental Conditions

Guided-wave structural health monitoring (SHM) systems with piezoelectric sensors are investigated for localisation of barely visible impact damage in CFRP plates under vibration and different thermal conditions. A single baseline set is used in a delay-and-sum algorithm with temperature correction for damage localisation in a large temperature range. Damage localisation is also demonstrated un...

Autoregressive Modeling with State-Space Embedding Vectors for Damage Detection under Operational and Environmental Variability

A nonlinear time series approach is presented to detect damage in systems by using a state-space reconstruction to infer the geometrical structure of a deterministic dynamical system from observed time series response at multiple locations. The unique contribution of this approach is using a Multivariate Autoregressive (MAR) model of a baseline condition to predict the state space, where the mo...

Damage Detection with Parallel Genetic Algorithms and Operational Modes

The detection of damage with model-based methods is a constrained nonlinear optimization problem. Conventional optimization approaches usually lead to local minima. Furthermore, they are highly sensitive to experimental noise or numerical errors. Genetic algorithms (GAs) provide an attractive alternative since they can potentially explore the entire solution space and reach the global optimum. ...

Damage Detection of Carbon Fiber-reinforced Concrete Under Bending Test