| ABSTRACT: | SIMULATION OF THE ACOUSTIC EMISSION IMPULSE SHAPE VARIATION PROCESS IN
METAL
V. Kozharinov1, and V. Kozharinov1
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1Moscow State University,Moscow;Russia ; 2 “TUV Nord Baltic” laboratory,Riga,Latvia
The increasing value and the weight in the field of physical methods of a non-destructive testing occupies a
method of an acoustic emission (AE). The basic advantage of AE method is the possibility to discover
dangerous defects on the large surface of testing and in hard-to-reach places,by putting pressure on the
object of testing in the certain way. However widespread occurrence of AE method in practice of a non-
destructive testing in many respects restrains by impossibility to determine the type of defect or to give the
answer to the question whether this certain defect have acted AE signals on separate sensors (inaccuracy in
determination of coordinate), by the most frequently used AE parameters (such as,for example,number of
events,amplitude,energy,frequency etc.). Most informative parameter for identifying a AE signal source is
its shape. Due to the rapid growth within the last 3 years of possibilities of AE instrumentation on
registration of the AE signal shape in the real time,the correlation link establishment between the AE signal
shape of a source and the registered AE signal shape from a sensor becomes possible. The physical-
mathematical pattern of distinction the “pre-image” of AE signal from its source using its “image”(AE
signal shape from the reception sensor) depending on spacing interval was built in the article, on an
example of low carbon steels. This pattern is based on available data of acoustic signal propagation in metal.
According to results of analysis some basic parameters of AE signal shape defining its variation were
chosen. Held studies demonstrate a possibility in the near future to compare results of experimental data on
registration of AE signal on different instrumentations with the purpose of creation of the unified database of
real sources.
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