Experimental study and prediction of frequency shift of piezoelectric ceramic packages

2000 ◽  
Author(s):  
Weiping Zhang ◽  
Young Sook Roh ◽  
A. Asiz ◽  
Yunping Xi
Keyword(s):  
Experimental Study ◽  
Frequency Shift ◽  
Piezoelectric Ceramic

Experimental Study about the Performance of the Piezoelectric Friction Damper

2010 ◽  
Vol 163-167 ◽  
pp. 2969-2972
Author(s):  
Ji Gang Zhang ◽  
Wen Yan Deng ◽  
Jian Han
Keyword(s):  
Experimental Study ◽  
Piezoelectric Ceramic ◽  
Input Voltage ◽  
Hysteretic Behavior ◽  
Loading Frequency ◽  
Friction Damper ◽  
Force Output ◽  
Output Performance ◽  
Deformation Ability ◽  
Energy Dissipation Capacity

Because of its excellent energy dissipation capacity, friction damper has a wide application in engineering structure, while its use is restricted by constant frictional force. Piezoelectric ceramic actuator has electrochromic deformation ability, by the use of this advantage to combine piezoelectric ceramic actuator with friction damper to form piezoelectric friction damper. This paper conducts some experiments, to study the force output performance and response time of piezoelectric friction damper as well as its hysteretic behavior. The results show piezoelectric friction damper has good force output capacity with the input voltage increases, and the hysteretic behavior is stable, which almost has no relevance with loading frequency.

scholarly journals Влияние ультразвукового излучения на время всплытия микропузырьков воздуха

2020 ◽  
Vol 43 (2) ◽  
Author(s):  
NIKITA ALAN-REIS ◽  
ANTON ESKIN ◽  
TATYANA ZHILYAKOVA ◽  
PETR UNRU
Keyword(s):  
Aqueous Solution ◽  
Experimental Study ◽  
Wastewater Treatment ◽  
Piezoelectric Ceramic ◽  
Wastewater Treatment Plants ◽  
Complex Nature ◽  
Ultrasonic Radiation ◽  
Ceramic Disk ◽  
Ascent Time ◽  
Pressure Flotation

Представлены результаты экспериментального исследования влияния ультразвукового излучения, генерируемого дисковым пьезокерамическим элементом ЦТС-19, на время всплытия микропузырьков, выделяемых из пересыщенного воздухом водного раствора. Показано, что под действием ультразвука происходит объединение пузырьков в комплексы, что увеличивает скорость их всплытия. Зависимость времени всплытия от частоты излучения носит сложный характер, применение ультразвука с частотой 160 кГц может снизить время всплытия с 39,9 до 13,5 с. Результаты работы могут быть использованы для увеличения производительности установок очистки сточных вод методом напорной флотации. The paper presents the results of an experimental study of the effect of ultrasonic radiation generated by a piezoelectric ceramic disk on the ascent time of microbubbles released from an aqueous solution saturated with air. It was shown that being irradiated by ultrasound, the bubbles combine into complexes, which increases the rate of their ascent. Dependency of the ascent time on the frequency of ultrasonic radiation is of a complex nature; however, the use of ultrasound with a frequency of 160 kHz can reduce the ascent time from 39.9 to 13.5 s. The results can be used to increase the productivity of wastewater treatment plants by pressure flotation.

Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

1995 ◽  
Vol 53 ◽  
pp. 636-637
Author(s):  
Norio Baba ◽  
Norihiko Ichise ◽  
Syunya Watanabe
Keyword(s):  
Experimental Study ◽  
Spherical Aberration ◽  
Incident Beam ◽  
Optical Parameters ◽  
Beam Tilting ◽  
Illumination Method ◽  
Restoration Method ◽  
Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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