期刊文献+
共找到3篇文章
< 1 >
每页显示 20 50 100
Analysis on vibration characteristics of large-size rectangular piezoelectric composite plate based on quasi-periodic phononic crystal structure 被引量:1
1
作者 Li-Qing Hu Sha Wang shu-yu lin 《Chinese Physics B》 SCIE EI CAS CSCD 2022年第5期438-447,共10页
Based on the theory of composite materials and phononic crystals(PCs),a large-size rectangular piezoelectric composite plate with the quasi-periodic PC structure composed of PZT-4 and epoxy is proposed in this paper.T... Based on the theory of composite materials and phononic crystals(PCs),a large-size rectangular piezoelectric composite plate with the quasi-periodic PC structure composed of PZT-4 and epoxy is proposed in this paper.This PC structure can suppress the transverse vibration of the piezoelectric composite plate so that the thickness mode is purer and the thickness vibration amplitude is more uniform.Firstly,the vibration of the model is analyzed theoretically,the electromechanical equivalent circuit diagram of three-dimensional coupled vibration is established,and the resonance frequency equation is derived.The effects of the length,width,and thickness of the piezoelectric composite plate at the resonant frequency are obtained by the analytical method and the finite element method,the effective electromechanical coupling coefficient is also analyzed.The results show that the resonant frequency can be changed regularly and the electromechanical conversion can be improved by adjusting the size of the rectangular piezoelectric plate.The effect of the volume fraction of the scatterer on the resonant frequency in the thickness direction is studied by the finite element method.The band gap in X and Y directions of large-size rectangular piezoelectric plate with quasi-periodic PC structures are calculated.The results show that the theoretical results are in good agreement with the simulation results.When the resonance frequency is in the band gap,the decoupling phenomenon occurs,and then the vibration mode in the thickness direction is purer. 展开更多
关键词 composite materials rectangular piezoelectric plate coupled vibration band gap
下载PDF
Numerical simulation of acoustic field under mechanical stirring
2
作者 Jin-He Liu Zhuang-Zhi Shen shu-yu lin 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第10期377-382,共6页
The present study analyzes the effect of stirring on ultrasonic degradation experiments through acoustic field distribution,which provides a guidance for further improvement of the degradation rate of organic solution... The present study analyzes the effect of stirring on ultrasonic degradation experiments through acoustic field distribution,which provides a guidance for further improvement of the degradation rate of organic solutions.It is known that in order to eliminate the standing wave field formed by ultrasonic radiation in the water tank,the liquid in the water tank needs to be stirred and the corresponding distribution of acoustic field is simulated by using the finite element method(FEM).The standing wave leads to an uneven distribution of the acoustic field when it is not stirred,and disappears after being stirred,which increases the cavitation area in the ultrasonic cleaning tank.Then,the degradation experiment with agitation is carried out.The experimental results show that the degradation rate of the solution is higher than that when there is no agitation,which confirms the importance of the acoustic field distribution to ultrasonic degradation.In addition,it is clear that with the increase of the stirring speed,the degradation rate increases first and reaches a maximum at 600 rpm before decreasing.Finally,the distribution of flow field is simulated and analyzed. 展开更多
关键词 ultrasonic degradation acoustic field finite element method flow field
下载PDF
Theoretical analysis and experimental validation of radial cascaded composite ultrasonic transducer
3
作者 Xiao-Yu Wang Zhi-Xin Yu +1 位作者 Jing Hu shu-yu lin 《Chinese Physics B》 SCIE EI CAS CSCD 2021年第4期184-192,共9页
A radial cascaded composite ultrasonic transducer is analyzed.The transducer consists of three short metal tubes and two radially polarized piezoelectric ceramic short tubes arranged alternately along the radial direc... A radial cascaded composite ultrasonic transducer is analyzed.The transducer consists of three short metal tubes and two radially polarized piezoelectric ceramic short tubes arranged alternately along the radial direction.The short metal tubes and the piezoelectric ceramic short tubes are connected in parallel electrically and in series mechanically,which can multiply the input sound power and sound intensity.Based on the theory of plane stress,the electro-mechanical equivalent circuit of radial vibration of the transducer is derived firstly.The resonance/anti-resonance frequency equation and the expression of the effective electromechanical coupling coefficient are obtained.Excellent electromechanical characteristics are determined by changing the radial geometric dimensions.Two prototypes of the transducers are designed and manufactured to support the analytical theory.It is concluded that the theoretical resonance/anti-resonance frequencies are consistent with the numerical and experimental results.When R_(2) is at certain values,both the anti-resonance frequency and effective electromechanical coupling coefficient corresponding to the second mode have maximal values.The radial cascaded composite ultrasonic transducer is expected to be used in the fields of ultrasonic water treatment and underwater acoustics. 展开更多
关键词 radial cascaded transducer radial vibration equivalent circuit effective electromechanical coupling coefficient
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部