Fatigue Cracks Detection using PZT Transducers under the Influence of Uncertain Environmental Factors

• Autorzy: Dziendzikowski M. , Klimaszewski S. , Dragan K.

Identyfikatory

DOI

10.1515/fas-2016-0010

• Języki publikacji: EN

Abstrakty

EN

This paper presents technique for qualitative assessment of fatigue crack growth monitoring, utilizing guided elastic waves generated by the sparse PZT piezoelectric transducers network in the pitch – catch configuration. Two Damage Indices (DIs) correlated with the total energy received by a given sensor are used to detect fatigue cracks and monitor their growth. The indices proposed carry marginal signal information content in order to decrease their sensitivity with respect to other undesired non-controllable factors which may distort the received signal. The reason for that is to limit the false calls ratio which besides the damage detection capability of a system, plays a crucial role in applications. However, even such simplified damage indices can alter over a long term, leading to the misclassification problem. Considering a single sensing path, it is very difficult to distinguish whether the resultant change of DIs is caused by a damage or due to decoherence of these DIs. Therefore, assessment approaches based on threshold levels fixed separately for DIs obtained on each of the sensing paths, would eventually lead to a false call. An alternative approach is to compare changes of DIs for all sensing paths. Developing damage distorts the signal only for the sensing paths in its proximity. In order to decrease the misclassification risk, a method of compensating such DIs drift is proposed. The main features and damage detection capabilities of this method will be demonstrated by conducting a laboratory fatigue test of an aircraft panel. The proposed approach has been verified on a real structure during fatigue test of a helicopter tail boom.

Słowa kluczowe

EN

structural health monitoring; PZT transducers; fatigue cracks detection; environmental factors compensation

• Wydawca: Wydawnictwa Naukowe Sieci Badawczej Łukasiewicz - Instytutu Lotnictwa
• Czasopismo: Fatigue of Aircraft Structures
• Rocznik: 2016
• Tom: Iss. 8
• Strony: 111--115
• Opis fizyczny: Bibliogr. 7 poz., rys., wzory

Twórcy

autor

Dziendzikowski M.

• Air Force Institute of Technology, Ks. Boleslawa 6 street, 01-494 Warsaw, Poland

autor

Klimaszewski S.

• Air Force Institute of Technology, Ks. Boleslawa 6 street, 01-494 Warsaw, Poland

autor

Dragan K.

• Air Force Institute of Technology, Ks. Boleslawa 6 street, 01-494 Warsaw, Poland

Bibliografia

• [1] Osgood, C. (1982). Fatigue Design - 2nd edition. Pergamon Press.
• [2] Staszewski, W., Boller, C., Tomlinson, G. R. (2004). Health monitoring of aerospace structures: smart sensor technologies and signal processing, John Wiley & Sons.
• [3] Giurgiutiu, V. (2014). Structural health monitoring: with piezoelectric wafer active sensors - 2nd ed., Academic Press.
• [4] Stepinski, T., Uhl, T., Staszewski, W. (2013). Advanced Structural Damage Detection: From Theory to Engineering Applications, John Wiley & Sons.
• [5] Su, Z., & Ye, L. (2009). Identification of damage using Lamb waves: from fundamentals to applications, Springer.
• [6] Dragan, K. & Dziendzikowski, M. (2016). Structural Health Monitoring 15, pp. 423-437.
• [7] Lisiecki, J., Blazejewicz, T., Klysz, S., Gmurczyk, G., Reymer, P., Mikulowski, G. (2013). Tests of polyurethane foams with negative Poisson’s ratio, Physica Status Solidi (B) 250, pp. 1988-1995.

Uwagi

EN

The work presented in this paper has been supported by the European Defence Agency (EDA) through Contract No B 1288 ESM2 GP entitled “Aircraft Fuselage Crack Monitoring System and Prognosis through on-board Expert Sensor Network (ASTYANAX)”. The tri-national ASTYANAX project involves the following partners: Politecnico di Milano (consortium leader), Alenia Aermacchi and Agusta Westland (Italy), Air Force Institute of Technology, Military Aviation Works No. 1 and AGH University of Science and Technology (Poland), and Instituto Nacional de Técnica Aeroespacial (Spain).

PL

Opracowanie ze środków MNiSW w ramach umowy 812/P-DUN/2016 na działalność upowszechniającą naukę (zadania 2017).