Abstract: The invention relates to a method and device for determining the fatigue resistance of metallic materials at ultrasonic frequencies and a constant temperature. The inventive method can be used to examine materials subjected to bending and traction/compression stresses at different temperatures ranging from atmospheric temperature to 1000° C. and at high frequency. Said method can be used to evaluate the breaking stress and the number of cycles to which the material has been subjected and to record the break profile. The device comprises an excitation system, a data acquisition system and resonant samples of the material.

Abstract: The invention relates to a method for making the drying of materials, particularly finely divided materials, more effective, in which method, of a slurry containing liquid and solids there is made a filter cake (2,12,22) onto the surface of the filter medium (1,11,21). According to the invention, the filter cake (2,12,22) and the oscillator (6,15,25) are arranged, in relation to each other, so that in between the filter cake (2,12,22) and the oscillator (6,15,25), there is generated an acoustic field by virtue of a mechanical contact between the filter cake (2,12,22) and the oscillator (6,15,25) or a structural element (7,16,26) connected to the oscillator.

Abstract: An apparatus and method for dehydrating solid products containing moisture, particularly food products, includes a hot gas stream device for creating a hot gas stream over the products to be dehydrated and an ultrasonic wave emitting system for directing ultrasonic waves over the products. The dehydrating apparatus includes a closed housing and at least one conveyor mounted in the housing for transporting the products. The ultrasonic wave emitting system includes a plurality of ultrasonic diffusing plates which are connected to sound wave generators and are in direct contact with the products.

Abstract: The invention relates to a method for making the drying finely divided materials, more effective in a suction drier provided with a fine porous suction surface, where the radii of the fine pores of the suction surface are essentially within the range of 0.5-2 micrometers, and in which method, of a slurry containing liquid and solids there is made a filter cake (2,12,22) onto a fine porous liquid suction surface constituting the filter surface of the filter medium (1,11,21), According to the invention, the filter cake (2,12,22) and an oscillator (6,15,25) are arranged, in relation to each other, so that in between the filter cake (2,12,22) and the oscillator (6,15,25), there is generated an acoustic field by virtue of a mechanical contact between the filter cake (2,12,22) and the oscillator (6,15,25) or a structural element (7,16,26) connected to the oscillator.

Abstract: The objective of the present patent is an acoustic chamber for treatment of gaseous effluents containing solid and liquid micro-particles in suspension at various frequencies and high intensities. The acoustic energy agglomerates the micro-particles, thereby facilitating their separation by means of conventional systems (electrostatic filters, cyclones, etc.). The chamber has a rectangular cross section and is axially traversed by the flow of the aerosols to be agglomerated (1), while the acoustic generators, being of vibrating-stepped-plate type (2) and being able to work at different frequencies, are arranged contiguously or alternatingly on the side walls to create intensive stationary fields in the various transversal sections of the chamber. To take advantage of the emissions from both faces of the acoustic generator's radiating plate, it is proposed to locate it in between of two planar reflectors which form an angle.

Abstract: New electroacoustic unit for efficient generation of high sonic and ultrasonic intensities in gas media and in interphases (gas-solid, gas-liquid.) Said unit is comprised of an electromechanical transducer system of which the radiating element is a plate (3) having a discontinuous profile and an electronic device for the controlled generation of the electric power signal. The unit is capable of generating acoustic fields of very high intensity with a predetermined configuration. Particularly it is capable of generating with a same transducer system two distinct configurations of the acoustic field. Prototypes for generating directional and focused fields have been developed.