An acceleration device includes an actuator configured to displace a mass in a reciprocating motion at a desired frequency, a mount configured to hold a device, such as an accelerometer device, and at least one spring connecting the mount to the mass. The actuator is used to apply a force to achieve resonance. The actuator may comprise a voice coil motor, wherein the voice coil motor includes a permanent magnet and an armature and wherein said armature comprises part of said mass. The actuator applies a periodic force to the mass. The periodic force may be a sinusoidal force. Preferably, the applied force is aligned with a resulting velocity of the mass. The mount may include a test socket to which the device is electrically connected. The spring may comprises one or more flexure elements. The acceleration device may be used with a handler device to connect and disconnect the device to and from the mount. Optionally, the handler device includes an environmental chamber surrounding the mount.

A control method of an ultrasonic welding system comprises: detecting operation of the ultrasonic welding system immediately while the ultrasonic welding system is in a working state; acquiring a current working frequency of an ultrasonic generator in the ultrasonic welding system while the ultrasonic welding system is detected to complete a preset first operation every time; determining a current frequency searching range of the ultrasonic generator according to the current working frequency of the ultrasonic generator; controlling the ultrasonic generator to search for an anti-resonance point in the current frequency searching range; and adjusting the working frequency of the ultrasonic generator to be an anti-resonance point while the anti-resonance point is searched in the current frequency searching range.

A control device for reducing and homogenizing welding residual stress by acoustic waves, comprising: a fixing tool having two rows of through holes; a plurality of ultrasonic transducers each having a body and a conical horn transmitting portion at a lower end of the body, wherein lower ends of the horn transmitting portions are fixedly connected with flanges, the horn transmitting portions of the ultrasonic transducers extend into respective through holes of the fixing tool to be in contact with welded parts below the fixing tool, the flanges are fixed to the fixing tool by bolts, and the two rows of through holes are arranged both sides of a welding seam of the welded parts; and a driving device for driving the ultrasonic transducers to operate. A corresponding control method is also provided. The control device can be used to control residual stress at the welding seam of steels.

A control device for reducing and homogenizing welding residual stress by acoustic waves, comprising: a fixing tool having two rows of through holes; a plurality of ultrasonic transducers each having a body and a conical horn transmitting portion at a lower end of the body, wherein lower ends of the horn transmitting portions are fixedly connected with flanges, the horn transmitting portions of the ultrasonic transducers extend into respective through holes of the fixing tool to be in contact with welded parts below the fixing tool, the flanges are fixed to the fixing tool by bolts, and the two rows of through holes are arranged both sides of a welding seam of the welded parts; and a driving device for driving the ultrasonic transducers to operate. A corresponding control method is also provided. The control device can be used to control residual stress at the welding seam of steels.

The invention relates to a sonotrode (1) for an apparatus (40) for generating low-frequency high-power ultrasound. To be able to manufacture and permanently operate the sonotrode even with elements (2, 3) made of brittle materials, the sonotrode (1) is constructed with at least two materially interconnected elements (2, 3).

A method for producing an ultrasonic transducer including an arrangement determination step of determining an arrangement of piezoelectric elements in a stack on the basis of mechanical quality factors of the respective piezoelectric elements; and an assembly step of assembling the stack in which the piezoelectric elements are arranged according to the arrangement determined in the arrangement determination step, a horn, and a back mass. In the arrangement determination step, the arrangement of the piezoelectric elements is determined so that the difference in mechanical quality factor between the piezoelectric elements adjacent in the longitudinal direction is within 5% of a mean value of the mechanical quality factors of the piezoelectric elements.

A method for producing an ultrasonic transducer including an arrangement determination step of determining an arrangement of piezoelectric elements in a stack on the basis of mechanical quality factors of the respective piezoelectric elements; and an assembly step of assembling the stack in which the piezoelectric elements are arranged according to the arrangement determined in the arrangement determination step, a horn, and a back mass. In the arrangement determination step, the arrangement of the piezoelectric elements is determined so that the difference in mechanical quality factor between the piezoelectric elements adjacent in the longitudinal direction is within 5% of a mean value of the mechanical quality factors of the piezoelectric elements.

An ultrasonic resonator support structure 10 including a holder 17 supports an ultrasonic resonator 16 at both sides such that the ultrasonic resonator 16 is rotatable to the holder 17. The ultrasonic resonator 16 includes an ultrasonic horn 13 with a machining tool 12 attached, and a first booster 14 and a second booster 15 coaxially fixed one by one to both ends in the axial directions of the ultrasonic horn 13. The holder 17 has a rolling bearing mechanism 18 that rotatably supports the first booster 14 side of the ultrasonic resonator 16 and a gas bearing mechanism 19 that rotatably supports the second booster 15 side of the ultrasonic resonator 16.

An ultrasonic resonator support structure 10 including a holder 17 supports an ultrasonic resonator 16 at both sides such that the ultrasonic resonator 16 is rotatable to the holder 17. The ultrasonic resonator 16 includes an ultrasonic horn 13 with a machining tool 12 attached, and a first booster 14 and a second booster 15 coaxially fixed one by one to both ends in the axial directions of the ultrasonic horn 13. The holder 17 has a rolling bearing mechanism 18 that rotatably supports the first booster 14 side of the ultrasonic resonator 16 and a gas bearing mechanism 19 that rotatably supports the second booster 15 side of the ultrasonic resonator 16.

A device (10′) for welding components by ultrasound. The device (10′) comprises a sonotrode (11′) having a sonotrode head (12′) which can be excited by a vibration generator to produce torsion vibrations with respect to a torsion axis (T). At least one welding surface (14′) is arranged on the peripheral side on the sonotrode head (12′) with respect to the torsion axis (T). The device (10′) also comprises a support device (15′) which supports the sonotrode head (11′) in a support area (16′), which contains a vibration node of the sonotrode head (12′). The support area (16′) and the welding surface (14′) at least partially extend along a common plane (E) which extends perpendicular to the torsion axis (T). A device (10′) for welding components by ultrasound by using a temperature control device are also disclosed.