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The amplitude of ultrasonic will occur some attenuation when it traveled in liquids. And the ultrasonic attenuation with different frequency in the liquid is not same. In this paper, two experiments are designed to research how the amplitude of the ultrasonic will change with different frequencies of ultrasonic traveling in the water. And we find that the ultrasonic attenuation with different frequency...
This paper introduces a longitudinal-torsional USM. Based on the electrical characteristics of the piezoelectric vibrator, a theoretical model was investigated. It can be used to derive the transient response characteristics of electrical parameters. The finite element analysis was also used to verify the correctness of the parameters change trend. The transient state of the analyzed parameters includes...
This paper reported an ultrasonic motor using the 1st longitudinal and the 2nd torsional (L-T) modes. The stator slots were useful to tune the resonance frequencies and increased L-T displacements largely. By cutting slots, which determined the number of oscillators, the whole stator was changed into independent vibrators. The more independent vibrators, the bigger power it outputs. The stator possessing...
Ultrasonic system is the major feature of the most bats and the vocal tract of the bats play an important in the system. Most prior study in the vocal tract of the bats are mainly based on the biology approach. In this paper, we use the numerical method to investigate the acoustics role of the vocal tract in a horseshoe bat, Rhinolophus hipposideros. 3D digital model of the horseshoe bat vocal tract...
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