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A new concept is presented that extrinsic Fabry-Perot interferometer (EFPI) sensors are designed to detect partial discharge (PD) in liquid insulation, and numerical simulation is used to analyze the distribution characteristics of acoustic emissions generated by partial discharge. The sensing head of EFPI mainly consists of an optical pigtail and a thin silica glass diaphragm. Based on wave propagation...
In this paper, a set of friction braking deceleration system is designed based on the ultrasonic motor. Because of the fast response and high accuracy, the system can realize the fast and accurate change of the speed, and achieve the stepless control of the speed. First, the structure of the friction braking deceleration system is designed, and the speed of a rotating disk is precisely controlled...
In this paper, a dual ring ultrasonic motor based on out of plane bending vibration mode is proposed, fabricated and characterized. This motor is composed of a stator constituted with two ring and one rod-shaped transducer at the middle and two disk shaped rotors. There are four piezoelectric ceramic plates are bolted at the middle of the rod-shaped transducer and used to excite the stator's blending...
A novel micro ultrasonic motor for multi-channel actuator control is proposed. It is composed of a stator constituted with a ring and two rod-shaped transducers and two cone shaped rotors. Two rod-shaped transducers have rectangular cross section, where four sets of piezoelectric element are bolted. Two sets excite longitudinal vibrations of the bars, and the other sets excite flexural vibrations...
Ultrasonic motor is a new type micro motor, with the characteristics of Light weight, low speed, no electromagnetic interference, high torque and fast response, which has broad application prospects In the field of national defense and military and aerospace. Therefore, the study of ultrasonic motor's performance is very necessary in the high/low temperature environment. This paper analyzed the changes...
The near-field acoustic levitation (NFAL) relative to other suspension methods has some unique advantages, such as no special requirements on the electromagnetic properties of the object, with considerable levitation and driving force, and so on. A novel ultrasonic levitation of gyroscope has been developed based on the inverse piezoelectric effect. The ultrasonic vibration is induced by two B04 flexural...
Based on the understanding of operation principle of traveling wave rotary ultrasonic motor, the physical condition is investigated for the disk stator with orthogonal vibration modes of the same frequency. It is pointed that the stator teeth have effect on geometry axial symmetry of the disk stator in addition to the increased driving for the rotor. Through qualitative analysis of dynamic equation...
This paper presents a dynamic analysis of a piezoelectrically driven vibro-impact drilling device with low down force and power consumption. The drilling device consists of an ultrasonic transducer with a piezoelectric stack, a free flying mass and a drill stem. Excited by the high-frequency vibration of the transducer the free mass oscillates between the horn tip of the transducer and the drill stem...
The suspension mechanism based on NFAL (near-field acoustic levitation) is fundamentally different from that in standing wave levitation. The proposed linear noncontact type actuator can levitate and carry the object along the direction of traveling wave in the planar plate, which produces the high intensity acoustic field. Moreover the object is suspended at the height only between tens and hundreds...
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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