The invention relates to a vibration damper (1) configured to be provided on a low frequency sound generator, which comprises a feeder unit (2) with a positive feedback system regulated by a reciprocating spring loaded piston (3) and a resonator tube (4). The vibration damper (1) may be positioned outside the resonator tube (4). The vibration damper (1) comprises a first flange (5) connected to the resonator tube (4), a number of springs (6), a second flange (7) and a number of weights (8).

A circuit of control of ultrasound transducers, is configurable according to the type of transducers to be controlled, and includes a first terminal intended to be coupled to a first electrode of each of the transducers, and a bias switch configurable to couple the first terminal to one or the other of first and second bias nodes according to the type of transducers to be controlled.

A device and method for reducing and homogenizing residual stress of a component by an array of high-energy elastic waves. The device includes a tubular body consisting of at least two elements, multiple first through holes and a clamping device provided on an outer side of the tubular body. Exciters are connected with exciting wedges so that an end face of each of the exciting wedges is closely coupled to a surface of the component. A connection portion is coupled to an emitting end of each of the exciters, where the axis of the emitting end coincides with a normal line at a pressed surface of the component A multi-channel signal amplifier is electrically connected to each of the exciters and a multi-channel excitation control module is electrically connected to the multi-channel signal amplifier.

A device and method for reducing and homogenizing residual stress of a component by an array of high-energy elastic waves. The device includes a tubular body consisting of at least two elements, multiple first through holes and a clamping device provided on an outer side of the tubular body. Exciters are connected with exciting wedges so that an end face of each of the exciting wedges is closely coupled to a surface of the component. A connection portion is coupled to an emitting end of each of the exciters, where the axis of the emitting end coincides with a normal line at a pressed surface of the component A multi-channel signal amplifier is electrically connected to each of the exciters and a multi-channel excitation control module is electrically connected to the multi-channel signal amplifier.

The present invention relates to a process for cooling a metal component, the process comprising the step of cooling said component in a confined space, said cooling involving cooling by means of a gas, the gas being cooled by heat exchange with a cooling surface of a heat sink inside said confined space, wherein a low frequency sound wave is provided into said confined space in order to improve heat exchange both between the gas and a cooling surface of the at least one heat sink, and between the gas and the metal component, characterised in that the cooling gas comprises at least one protective inert gas. The invention further relates to an apparatus for performing the process.

Various embodiments of the present disclosure are directed to a device and a method for producing a standing ultrasonic field having the frequency f in a liquid. In one example embodiment, the device includes at least one oscillation element, a substantially dimensionally stable vessel having an outside wall and a substantially circular-cylindrical interior, the vessel receiving the liquid and the at least one oscillation element. The at least one oscillation element acoustically connected to the outside wall of the vessel and electrically excited at the frequency f. The substantially circular-cylindrical interior receives liquid with an inner radius r.sub.o at least in the region of the oscillation element. The oscillation element has a mean thickness p and a width b in the direction orthogonal to a main axis of the interior, and the width b is not greater than the inner diameter 2r.sub.o.

Various embodiments of the present disclosure are directed to a device and a method for producing a standing ultrasonic field having the frequency f in a liquid. In one example embodiment, the device includes at least one oscillation element, a substantially dimensionally stable vessel having an outside wall and a substantially circular-cylindrical interior, the vessel receiving the liquid and the at least one oscillation element. The at least one oscillation element acoustically connected to the outside wall of the vessel and electrically excited at the frequency f. The substantially circular-cylindrical interior receives liquid with an inner radius r.sub.o at least in the region of the oscillation element. The oscillation element has a mean thickness p and a width b in the direction orthogonal to a main axis of the interior, and the width b is not greater than the inner diameter 2r.sub.o.

A non-contact handling tool (8) for picking up an object (3), the tool comprising an ultrasonic transducer (10) extending between a reflective side and a picking side configured to emit ultrasounds forming, in a near field area of the picking side, an excess-pressure wave, and a fluid suction system configured to suction a fluid towards the picking side, forming in said near field area an under-pressure. The fluid suction system comprises at least a fluid suction channel (30) disposed in the ultrasonic transducer. The transducer has a height defined between the picking side and the reflective side corresponding to a half wavelength of the ultrasounds generated in the transducer.

A non-contact handling tool (8) for picking up an object (3), the tool comprising an ultrasonic transducer (10) extending between a reflective side and a picking side configured to emit ultrasounds forming, in a near field area of the picking side, an excess-pressure wave, and a fluid suction system configured to suction a fluid towards the picking side, forming in said near field area an under-pressure. The fluid suction system comprises at least a fluid suction channel (30) disposed in the ultrasonic transducer. The transducer has a height defined between the picking side and the reflective side corresponding to a half wavelength of the ultrasounds generated in the transducer.

A tobacco rod for a flavor inhaler includes a cylindrical container, and a flavor source including tobacco filled in the cylindrical container, in which the flavor source is filled in such a manner as to form voids over a longitudinal direction, and the following relationship is satisfied: S/T≤17%, wherein T represents an area of all voids present in a cross-section of the flavor source orthogonal to the longitudinal direction of the cylindrical container, and S represents a total area of voids each having an area of 800000 μm.sup.2 or more in the cross-section.