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In order to convert more vortex-induced vibration energy into electricity, a piezoelectric energy harvesting system using a modified circular cylinder is studied to evaluate its performance in water. The circular cylinder is often used to induce the Karman vortex street. To produce stronger and more regular vortices, a circular cylinder with a slit and concave rear surface is adopted in this paper...
In order to improve the output performance, multi-stator structure is applied to traveling wave type ultrasonic motor (TWUM). In this paper, taking into account the multi-stator traveling wave type ultrasonic motor (MSUM) with diameter of 60mm, authors apply the elastic contact principle to deduce the MSUM's simulation model. By reason of machining errors and installation errors, the stators and rotors...
To transform kinetic energy of flowing water into electricity, an energy harvesting system based on vortex-induced vibration is investigated. In accordance with the theory of flow around bluff bodies, the Karman vortex street is first created to improve the vibrational energy of water. After that, the forces from shedding vortices make the polyvinylidene fluoride (PVDF) beam vibrate periodically....
This paper analyses a kind of leaf spring ultrasonic motor (USM). A radial vibration of the stator is excited by PZT and then the radial displacement is converted to a rotation of the rotor by the bending of leaf springs. The dynamics model of the motor is firstly studied by theoretical method and then the amplitude-frequency characteristic of the stator is calculated by the Finite Element Method...
The piezo-driven technology with the aid of mercury is effective for performing the introcytoplamic sperm injection. However, the toxicity of mercury may cause damage to the operators and oocytes which call for the elimination of the mercury. Although the substitutes are developed, they don't work as well as the mercury. To obtain a better result without mercury, a piezo-driven technology based on...
Fertilization performed by intracytoplasmic sperm injection(ICSI) using a piezo unit is recognized as the most practical technique not only for endangered species but also for humans. However what depresses us is the toxicity of mercury which may pose a bad influence on the health of humans and the competence of mouse oocytes. This limitation confines the use of this technique in hospitals and laboratories...
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