Low- and high-frequency nonlinear acoustic phenomena in a magnesite
| Autor: | A.B. Kolpakov, V.E. Nazarov |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Range (particle radiation)
Materials science Acoustics and Ultrasonics Acoustics Mechanics Radiation Dosage Action (physics) High-Energy Shock Waves Nonlinear system Hysteresis chemistry.chemical_compound Sound chemistry Energy Transfer Models Chemical Nonlinear Dynamics Materials Testing Dissipative system Scattering Radiation Ultrasonic sensor Computer Simulation Magnesium Group delay and phase delay Magnesite |
| Zdroj: | Ultrasonics. 54(2) |
| ISSN: | 1874-9968 |
| Popis: | 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). |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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