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• W2567417497 abstract "The purpose of the present report consists in studying an opportunity of use of devices for registration of complex signals in thin-walled details of structures. Lamb's wave properties were used for explanation of dynamic reaction of thin plate surface when in some place there is some source of impulse loading. The experiment on the study of some parameters of propagation of elastic waves in the plate from the Al-Cu aluminium alloy was carried out. Using the Lamb's waves' dispersion property, the formal simulation of waves interference was carried out. It was shown that dynamic reaction of thin plate surface could be explained as effect of several waves' interference. One of the most perspective methods of the continuous control of materials and structures is use of properties of Lamb's waves. Lamb's waves are essentially ultrasonic waves, but they differ from classic bulk ultrasonic waves in their propagation properties. One important basic property of Lamb's waves is their inherent dispersive nature: the velocity of propagation of a Lamb's wave is dependent on its frequency or, to be more specific, on the product of frequency and plate thickness. The detection of material with Lamb's waves is based on the fact that the propagation of these wave types is affected by the presence of phenomena like corrosion, cracking or delaminating. Lamb's wave modes will partially reflect at defects, but part of their energy will also be transmitted, so both configurations can be used for detection. Since the sample materials were typically of thin plate construction, we have concentrated exclusively on the propagation of ultrasonic Lamb's waves (1, 2) within the samples. Changes in the condition of the sample under test, affected parameters of the Lamb's wave propagation characteristics, and in this fashion, by the application of suitable processing procedures, it was possible to infer the presence and position of structural within the sample plates. Previous work (3, 4) has tended to focus on the echo discrimination of signals in a pitch-catch arrangement. This approach can be frustrated by the complexity of Lamb's wave propagation; for in addition to problems of low amplitude and edge reflection effects, the propagation characteristics of ultrasonic Lamb's waves can exhibit considerable pulse velocity dispersion and complications due to multiple mode propagation (5, 6). Some novel approaches to addressing some of these problems have included processing to enhance defect visibility (7), system identification (8) and regeneration (9, 10, 11). Lamb's wave technology can be used in both an active and a passive manner: • active: selected Lamb's wave modes are injected into the structure, information about the state is deduced from observed reflected/propagated waves • passive: Lamb's waves are generated by the process of formation and are detected by suitable sensors; this technique is also known as modal acoustic emission. The main contents of this article assumes research probably more common regularities of propagation of passive Lamb's waves at presence of a various kind of damages of materials, elements of structures and their joints. As it is known, at use of a method of acoustic emission (AE) the main difficulty consists in adequate interpretation of results of measurement. The model damage - signal creation is base of successful application of AE method for NDI of structures (12-14). Many devices for registration of signals AE use quantity of pulses that is proportional to quantity of fluctuations of a surface in a place of statement of the receiver of signals as parameter. The purpose of the present report consists in studying an opportunity of use of devices for registration of complex signals in thin-walled details of structures." @default.
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• W2567417497 date "2006-01-01" @default.
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• W2567417497 title "SIMULATION OF LAMB'S WAVES PROPAGATION FROM STRUCTURAL DAMAGE" @default.
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