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By Victor M. Baranov,Evgeny M. Kudryavtsev,Gennady .A. Sarychev, et al.Elsevier|Elsevier Science||Elsevier ScienceAdult NonfictionScience, Technology, EngineeringLanguage(s): EnglishOn sale date: 08.04.2011Street date: 29.07.2011Preview

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2. Schematic representation of AE signal: 1 – maximal amplitude of pulse; 2 – noise level; 3 – voltage; 4 – single oscillations; 5 – standard deviation of amplitude; 6 – interval between pulses; 7 – discrimination level; 8 – time; 9 – pulse duration; 10 – events If individual events inducing the emission of AE pulses are independent and equiprobable in time then the pulse flow in called the Poisson flow since the probability of registration of N pulses during time t is described by the Poisson distribution: PN t = vt N exp −vt N!

It is related to the amplitude of a single pulse, that is, the higher the amplitude, the greater number of oscillations is registered. Note that when registering continuous AE it is preferably to use predetection count. This yields the mean-square error of N˙ several times less compared with postdetection count. At the same time, the use of predetection count distorts such AE characteristics as the amplitude and amplitude-time distributions, CHAPTER 1 24 the spectral density, the total count, etc.

The second approach is numerical. The integral equations of the Hertz theory are solved by numerical methods using experimental data on the topography of real surfaces [4, 5]. Though the latter approach seems to be advantageous it demonstrates common drawbacks of numerical methods. The basic drawback is that it is difficult to find regularities if the number of initial parameters of a problem to be solved is great. Besides, the problem of reconstruction of the pressure distribution belongs to ill-defined problems because data on microasperity dimensions, the approach of the surfaces in contact and other characteristics that are rough are used in calculations.

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Acoustic Emission in Friction by Victor M. Baranov,Evgeny M. Kudryavtsev,Gennady .A. Sarychev, et al.Elsevier|Elsevier Science||Elsevier ScienceAdult NonfictionScience, Technology, EngineeringLanguage(s): EnglishOn sale date: 08.04.2011Street date: 29.07.2011Preview


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