Structural vibration testing is a measurement technique that is used in engineering to examine the condition of structures, such as bridges and airplanes. The basic idea behind structural vibration testing is that damage will alter the stiffness, mass or energy dissipation properties of a system, which in turn will change the dynamic response of the system when it is excited with a forcing func...

Structural health monitoring is described in the context of a statistical process control paradigm. This paper demonstrates the application of various statistical process control techniques such as the Shewhart, the exponentially weighted moving average, and the cumulative sum control charts to vibration-based damage diagnosis. The control limits are first constructed based on the measurements ...

An effective method utilizing the differential evolution algorithm (DEA) as an optimisation solver is suggested here to detect the location and extent of single and multiple damages in structural systems using time domain response method. Changes in acceleration response of structure are considered as a criterion for damage occurrence. The acceleration of structures is obtained using Newmark me...

Corrosion, stress-corrosion cracking or corrosion-initiated fatigue significantly impact maintenance downtime and structural life limitations of aging aircraft. Both legacy and new air platforms such as the Joint Strike Fighter (JSF), realize that corrosion will likely continue to be a structural challenge that warrants a structural health management system to provide accurate, cost effective a...

Current health monitoring approaches for large structures mostly rely on a combination of distributed sensor networks and in-situ inspection. This paper presents novel online diagnostics prognostics framework subject to multiple failure modes demonstrates the proposed method with high-fidelity finite element model using data sources (i.e., strain gages images). The approach aims at an accurate ...

Diagnosis and management of blood culture-negative endocarditis constitute a formidable clinical challenge and a systemic approach is necessary for a successful outcome. Blood cultures are negative in endocarditis due mainly to preceding antibiotic administration or to fastidious slow-growing organisms. Less so, non-infective endocarditis is a paraneoplastic manifestation or may occur in associ...