Abstract：
:The results of experimental and theoretical studies of nonlinear acoustic phenomena (amplitude-dependent losses, resonant frequency shifts, damping of weak ultrasonic pulses and their carrier frequency phase delay under action of a powerful low-frequency pumping wave as well as amplitude-phase self-action of the finite-amplitude ultrasonic pulses) in a magnesite rod are presented. Analytical description of the observed phenomena was carried out within the frameworks of the phenomenological state equations that contain low-frequency hysteretic nonlinearity and both high-frequency dissipative and elastic nonlinearity. From comparison of experimental and analytical amplitude-frequency dependences of nonlinear phenomena, the values of magnesite acoustic nonlinearity parameters were determined. The frequency dependences have been discovered for hysteretic (in a range 3.6-17.2 kHz) as well as dissipative and elastic nonlinearity (in a range 50-370 kHz).
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Nazarov VE,Kolpakov ABdoi
10.1016/j.ultras.2013.07.008subject
Has Abstractpub_date
2014-02-01 00:00:00pages
471-8issue
2eissn
0041-624Xissn
1874-9968pii
S0041-624X(13)00211-4journal_volume
54pub_type
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