For modern aircraft, wind turbines, and other aerospace structures composites are replacing metal components. These aerospace structures will be designed and expected to perform well for many years ahead. Therefore, structural health monitoring (SHM) systems are being designed to monitor these structures to improve maintenance, repairing or replacing composites components when the need arises. ...

Акустико-эмиссионный метод неразрушающего контроля является одним из эффективных и экономичных способов обследования сосудов высокого давления для поиска в них скрытых дефектов (трещин, расслоений др.), а также единственным методом, чувствительным к развивающимся дефектам. Скорость распространения звука объекте ее адекватное определение локационной схеме имеют важнейшее значение точности локаци...

On the rotor comprehensive fault simulation testbed, characteristics of acoustic emission signal of different crack rotors in various depth and conditions are analyzed by the acoustic emission extraction experiment. The noiseeliminating method of the acoustic emission signal was researched by the wavelet packet technique, the characteristics of acoustic emission signal of the rotor crack was al...

Study the tensile damage and fracture behavior of FRP composite materials by the acoustic emission technology, broadband sensors record the acoustic emission signals when composite materials in the process of tensile damage at different fiber angle. The acoustic emission characteristics of FRP composite materials’ tensile damage was analyzed by 3D parameter methods. Analysis the amplitude of co...

in recent years, need to increase the convenience of trips in railway vehicles causes that train operators and manufacturers focus on reducing the noise level which is sensed by passengers. in this paper, first the state of modeling acoustic noise in cab train is discussed and natural frequencies and acoustic mode shapes are derived and then formulation of acoustic pressure in the cab will be o...

INTRODUCTION Stress fracture of bone is a process which involves generation and propagation of microfailure events. Earlier studies have examined damage accumulation during fatigue testing at different intervals using histology (1). Histology provides substantial insight to damage evolution; however, it is an inherently static process and it can reflect the temporal changes in microfailure proc...

Two nondestructive evaluation (NDE) laboratory-based courses were developed for Engineering and Engineering Technology (ET) students of Drexel University. The ultrasound NDE laboratory allows for participation in laboratory activities in two modes: the traditional face-to-face classroom mode for students on Drexel’s campus, and a real-time, Internet-based mode for those at remote locations. Dur...

In order to estimate health conditions of fan bearings and predict their remaining life before failure, relevant features associated with their degradation must be identified. There are few published papers that deal with the selection of relevant features from acoustic emission signals for health condition estimation and life prediction of bearings in cooling fans. For this study, acoustic emi...