Abstract
For the longitudinal–torsional composite integrated ultrasonic variable amplitude system with the longitudinal–torsional resonance produced by helical slots in the cone of the launch section, the theoretical design, finite element simulation, and experimental study are carried out. The performed analysis of the helical slot structural characteristics revealed that slot depth, helical angle, and slot width have a strong effect on the natural frequency and ratio of the torsional–longitudinal amplitude. A credible technique for adjusting the deviation of the actual system natural frequency from the theoretical design value by traditional method is proposed based on the adjustment theory of non-uniform medium adopted. The experimentally proved reduction of the above deviation strongly suggests that the approach proposed in this article provides effective theoretical guidance and experimental basis for the study of longitudinal–torsional composite integral ultrasonic variable amplitude system.
Highlights
The ultrasonic vibration system is usually composed of an ultrasonic generator, an ultrasonic transducer, horn, and tool
Using the modified theory to redesign the longitudinal vibration composite horn with a quarter wavelength, while the other size is fixed, l5 increases from 16 to 13.5 mm, the natural frequency of the longitudinal vibration IUVAS increases from 33,378 to 34,511 Hz, and the frequency offset is reduced from 5.4% to 1.43%
The design of helical slots in the conical section of that transmitting terminal can realize the transformation from longitudinal vibration mode to L-T composite mode
Summary
The ultrasonic vibration system is usually composed of an ultrasonic generator, an ultrasonic transducer, horn, and tool. Multiple helical slots have been designed on the conical part of the composite horn in the right side, and the longitudinal vibration changes into L-T vibration, according to the modal transformation of the acoustic refraction principle. The third vibration mode transformation can be realized by reasonably designing the geometric structure of the front mass.[21] the whole system is resonant in the longitudinal direction and torsional direction at same frequency In this article, the latter method is adopted to design multiple helical slots on the composite horn, wherein the Figure 3. The preload force is applied via the torque wrench, to ensure the required axial force of the amplitude transformer and a close connection between the joints.[23] To avoid the vibration caused by the manufacturing and installation mismatches, the isolation slot is designed to reduce the energy loss at the flange
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