Bayesian Methods for Aircraft Structural Health Monitoring
نویسندگان
چکیده
Aircraft structures, whether metallic or composite, are subject to service damage which requires their periodic inspection and maintenance. While taking the aircraft out of service is quite costly, the assurance of structural integrity requires such inspection – and possible repair work based on the inspection results obtained. If damage is detected from an inspection, the decision whether to repair as well as the method of repair must be made on the basis of data relevant to the specific inspection method being used, and with an uncertainty that has been characterized as accurately as possible. This is an example of an application that is amenable to a Dynamic Data Driven Application System (DDDAS) solution. That is, data can be acquired dynamically, and compared to a model of the structure such that damage can be located and a determination made as to whether it requires further inspection and possible repair. Moreover, Bayesian methods allow the characterization of uncertainty, and with the appropriate inference networks they allow conditional probabilities to be determined in terms of what is known about the structure from the model and what is measured during the inspection. The methodology under development allows the accuracy of the model as well as that of the inspection data to be taken into consideration, and uses an iterative approach to improve both the model and the inspection data. That is, inspection data can be used to determine physical constants or variables used in the model (e.g., Young’s modulus, diffusion constants, etc.), and the computational model can be used to improve inspection data (e.g., pose, noise, hysteresis, etc.).
منابع مشابه
Wireless Sensor Networks Applications in Aircraft Structural Health Monitoring
Aircraft industry has to meet a challenge of reducing operational and maintenance costs. One of the possible ways for reducing these costs is the introduction of wireless sensor networks (WSNs). WSNs are already finding a variety of applications for both safety-critical and non-safety critical distributed systems. This paper deals with the application of WSNs for aircraft structural health moni...
متن کاملPiezoelectric Wafer Embedded Active Sensors for Aging Aircraft Structural Health Monitoring
Piezoelectric wafer active sensors may be applied on aging aircraft structures to monitor the onset and progress of structural damage such as fatigue cracks and corrosion. The state of the art in piezoelectric-wafer active sensors structural health monitoring and damage detection is reviewed. Methods based on (a) elastic wave propagation and (b) the Electro–Mechanical (E/M) impedance technique ...
متن کاملLeed-lifetime Energy Efficient Data Acquisition Technique for Aircraft Structural Health Monitoring Systems
Implementation of low cost sensor nodes in recent years allows wireless sensor nodes to be applicable for wide range of applications in aircraft control systems. Rapid use of composite materials for aircraft structures, calls for the development of novel methods for aircraft structural health monitoring. Visual inspection of failures due to delamination of layers and cracks developed in metal s...
متن کاملAircraft Integrated Structural Health Assessment – Structural Health Monitoring and its implementation within the European project AISHA
Today’s aircraft inspection procedures are excellent, but expensive and not appropriate in all situations. A cheaper alternative for damage detection could be offered by “structural health monitoring (SHM)”. With such SHM systems, a permanent sensor network, comparable to the nervous system in a human body, is placed at crucial structural components of an aircraft. However, this apparently easy...
متن کامل