Radial-torsional vibration conversion ultrasonic transducer based on radial chute disc

•·Radial waves can be synthesized into circumferential waves by the action of the radial chute.•·The mechanical model of the radial waves conversion torsional waves is established.•·The test proves that only torsional wave is coupled during resonance to achieve pure torsional output. Using the stress wave generated by radial excitation, an ultrasonic transducer with pure torsional output based on a radial chute is developed. Based on the reflection principle of the stress wave from the radial chute, the mechanical model of the radial wave entering the chute disc then synthesizing the circumferential wave is established, and the stress state of the stress wave after the radial wave acts on the chute is deduced. On this basis, the influence of the chute angle on the circumferential wave is obtained. Theoretical analysis shows that there is an optimal chute angle for the synthesis of the circumferential wave. Then, the optimal inclined chute disc and ultrasonic transducer are selected for modal analysis. In the simulation, the radial wave generated by the excitation is evenly distributed at the disc and effectively converted into a circumferential wave. The converted circumferential wave is transmitted to the output end through the amplitude transformer of pure torsional mode, and the ultrasonic transducer realizes pure in-plane torsional output. When measured, the circumferential amplitude of the output rod is 5.22 times of the radial amplitude of the chute disc.