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  1. No Access

    Chapter and Conference Paper

    Digital Model for Predictive Assessment of a Power Transformer Technical Condition

    The reliability and safety of the electrical power system are ensured by monitoring and diagnosing the technical state of the equipment that comprises the power system. Power transformers are one of the most i...

    A. A. Yahya, V. M. Levin in SMART Automatics and Energy (2022)

  2. No Access

    Chapter and Conference Paper

    Interaction of Short Pulses of Focused Ultrasound with Interfaces and Plane-Parallel Objects

    Short pulses of focused ultrasound are effective instrument for measuring local velocity values of bulk acoustic modes and for studying local elastic properties of solids (microacoustical technique). The probe...

    V. M. Levin, Yu. S. Petronyuk, I. V. Ponevazh in Acoustical Imaging (2004)

  3. No Access

    Chapter and Conference Paper

    Investigation of Structure and Properties of Immisible Polymer Blend by Acoustic Microscopy Techniques

    Local elastic properties and microstructural features of low-density polyethylene-polypropylene (LDPE-PP) blends have been studied by microacoustical. Focused altrasonic beam of acoustic microscope has been em...

    J. S. Petronyuk, O. V. Priadilova, V. M. Levin, A. A. Popov in Acoustical Imaging (2004)

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    Chapter and Conference Paper

    On the Solutions of the Inhomogeneous Helmholtz Wave Equation for Ellipsoidal Sources

    The solution of the inhomogeneous Helmholtz equation (the ’dynamic’ or ’Helm- holtz potential’) and its time domain representation (the retarded potentials) for an ellipsoidal source region is analyzed. They o...

    T. M. Michelitsch, J. Wang, H. Gao, V. M. Levin in Continuum Models and Discrete Systems (2004)

  5. No Access

    Chapter and Conference Paper

    Imaging of Carbon-Fiber-Reinforced (CFR) Laminates Microstructure by Acoustic Microscopy

    The focused ultrasonic beam technique has been employed to image bulk microstructure of carbon fiber-reinforced (CFR) composites. Ultrashort probe pulse (operation frequency of 50 MHz) provides layer-by-layer ...

    S. Liu, E. Guo, V. M. Levin, J. S. Petronyuk in Acoustical Imaging (2004)

  6. No Access

    Chapter and Conference Paper

    On the Effective Constants of Inhomogeneous Poroelastic Medium

    The arbitrary anisotropic micro-inhomogeneous (composite) poroelastic medium is considered, containing a random set of ellipsoidal inclusions with other poroelastic characteristics. The properties of these con...

    V. M. Levin, J. M. Alvarez-Tostado in Continuum Models and Discrete Systems (2004)

  7. No Access

    Chapter and Conference Paper

    Measuring Sound Velocities and Anisotropy of Microstructural Units of Laminate Composite Materials by Microacoustical Technique

    The CFR composites are manufactured as laminate packages of ordered carbon fiber layers (prepreg plies) embedded into a polymer binder (epoxy, bismeleimide or other types of polymer resin). Elastic properties ...

    Song** Liu, Enming Guo, V. M. Levin, Yu. S. Petronyuk in Acoustical Imaging (2004)

  8. No Access

    Chapter and Conference Paper

    Application of Microacoustical Technique to Study Elastic Properties and Microstructure of New Generation of Bulk Metallic Glasses

    Elastic properties of bulk metallic glass (BMG) Pd39Ni10Cu10P21 have been studied basing on sonic velocity data analysis. Different states of the Pd39Ni 10Cu 1 oP21 system (glassy state, super-cooled liquid (SCL)...

    V. M. Levin, S. J. Petronyuk, L. Wang, J. Hu, Q. Zhang in Acoustical Imaging (2004)

  9. No Access

    Chapter

    Imaging of Deep Internal Layers in Layered Polymer Systems Using the Ultra-Short Pulse Acoustic Microscope

    Most of the large variety of non-destructive methods and their associated measurement instruments for flow, multilayer and crack detection are based on two physical principles: eddy-current monitoring and ultr...

    R. G. Maev, M. P. Pyshnyi, E. Yu. Maeva… in Review of Progress in Quantitative Nondest… (1997)

  10. No Access

    Chapter

    Phonon Focusing Influence on the Formation of Acoustic Image in Crystals

    We have studied the application of the phonon focusing phenomenon, i.e. maximal flattening of the defined acoustical mode slowness surface, for purposes of acoustical microscopy.

    L. A. Chernozatonskii, V. M. Levin, V. V. Novicov, A. V. Vakulenko in Acoustical Imaging (1992)

  11. No Access

    Chapter and Conference Paper

    Test Facility for the Flow Structure Study in the Supersonic Combustion Chamber

    A facility for the investigation of flow structure in a supersonic combustion chamber has been constructed and tested. The side walls of the rectangular combustion chamber model can be moved during the experim...

    S. I. Baranovsky, D. M. Davidenko, V. M. Levin in Flow Visualization VI (1992)

  12. No Access

    Chapter

    Study of Structure and Properties of Highly Anisotropic Materials by Acoustomicroscopical Methods

    The acoustic images are usually worsened by anisotropic effects. There are two reasons for this. Firstly the dependence of phase velocity in anisotropic medium on the propagation direction results in defocusin...

    V. M. Levin, R. G. Maev, K. I. Maslov, T. A. Senjushkina… in Acoustical Imaging (1992)