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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...
A new type of linear motor is introduced which can work under non-resonant condition with a wide frequency range. The friction driving mechanism of motor was investigated and working process of the motor was described as driving process and detachment process. Then complete detachment was defined as no strain between the stator and the slider. Further, the vibration differential equation was deduced...
For the reason of flight conditions (altitude, high humidity), the helicopter is more susceptible to icing conditions than other fixed-wing aircraft. To meet the requirements of the helicopter flying in all weather, deicing measures must be taken for the blade. There are lots of existing blade deicing methods, electro-thermal is widely used, but the loss of power is very great. With the development...
The total harmonic distortion (THD) is an important character of vibration transducer calibration system. A new method is proposed in this paper to reduce the THD, which is based on the open-loop frequency response analysis of the vibration transducer calibration system and harmonic compensation. The mathematic model of the motion of electric shaker is described. Results of simulations and experiments...
A novel Ultrasonic/sonic Driller/Corer (USDC) has been developed for deep space exploration. This low axial load is required and few impact forces are produced for the USDC to sample rocks, which results in the important advantage of low energy dissipation. Based on inverse piezoelectric effect, the ultrasonic vibration is induced for the transducer of the USDC. The ultrasonic/sonic vibration energy...
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