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The methods of vibratory building products driving in ground with vibratotors are known. The coaxial-linear motor with constant magnets and magnetic bracket is used as a drive of these vibratotors. The moving element of this motor makes axial mechanical vibrations with frequency of current in energizing coil. We can influence on regulation of amplitude of mechanical oscillation with current strength and direction of direct current. The methods of computer modeling and experimental investigations of electromechanical propulsion performance characteristics of these motors. The computer modeling and experimental investigations are made for specified position of secondary cell and values of current strength in energizing coil of motor. During the investigations the dependences of propulsion performance characteristic in motor from relatively attitude position of secondary cell and values of current strength in energizing coil are presented. References 7, figures 6. [ABSTRACT FROM AUTHOR]

general theory for calculating the dispersion of bulk acoustic waves in 3D and 2D phononic crystals made of anisotropic materials is presented, which is based on the plane-wave expansion method. Two approaches to separating acoustic modes in the dispersion diagrams are proposed. The pattern of the acoustic field distribution is studied as depending on the wavevector direction for various types of modes. Degeneracy of acoustic modes in directions different from the axes of symmetry of the phononic crystal is demonstrated. Possibilities of the proposed method are illustrated by the application to 3D and 2D silicon-based phononic crystal structures. [ABSTRACT FROM AUTHOR]