Eigenmode Approach for a Periodic Composite Transducer Subject to Fluid Loading

1998 ◽  
Vol 120 (2) ◽  
pp. 313-323 ◽  
Author(s):  
V. V. Varadan ◽  
Jen Hwa Jeng ◽  
Liang Chi Chin ◽  
Xiao Qi Bao ◽  
V. K. Varadhan
Keyword(s):  
Finite Element ◽  
Transmission Efficiency ◽  
Fluid Loading ◽  
The Finite Element Method ◽  
Reflection And Transmission ◽  
Periodic Distribution ◽  
Conductance Spectrum ◽  
Floquet Representation ◽  
Periodic Composite ◽  
Weighting Coefficients

A hybrid finite element eigenmode—Floquet mode representation is formulated and numerically implemented to study the performance of composite transducers subject to fluid loading. The periodic distribution of the piezoelectric elements in the form of rods in a dielectric host material permits consideration of only one unit cell of the distribution in the finite element solution. Again, due to periodicity, the acoustic field in the infinite fluid is represented as superposition of plane wave Floquet modes. The finite element method is used to solve the eigenmodes of vibration of the transducer and an eigenmode superposition with unknown weighting coefficients is interfaced with the Floquet representation. Continuity at the boundary is used to solve for both sets of unknown coefficients. The effect of rod cross section, concentration, material damping are studied as a function of frequency. Useful transducer parameters such as transmission efficiency and the conductance spectrum as well as reflection and transmission spectrum of the array are simulated numerically.

Analysis of Harmonic Gear Drive Efficiency Based on the 3D Simplified Model

2014 ◽  
Vol 1006-1007 ◽  
pp. 249-252
Author(s):  
Xiao Dong Wu ◽  
Meng Liang Bai ◽  
Yuan Li ◽  
Qian Hong Cao ◽  
Xiao Chen Du
Keyword(s):  
Finite Element ◽  
Rotational Speed ◽  
Transmission Efficiency ◽  
Harmonic Drive ◽  
The Finite Element Method ◽  
Gear Drive ◽  
Output Torque ◽  
Transmission Design ◽  
Finite Element Numerical Simulation ◽  
And Performance

This study based on the finite element method, the type of XB1-120-100 harmonic drive output torque and input rotational speed impact on transmission efficiency has been analyzed. The results show that the efficiency of harmonic gear drive increases with the output torque increased, and it has no relation with input rotational speed. When the output shaft takes the value of rated torque (Tout=450Nm), the transmission efficiency of harmonic gear drive obtained by the finite element numerical simulation is 87.1%. This value of transmission efficiency is quite close to the type of XB1-120-100 harmonic drive efficiency (75%-90%). The above analysis method and results have a guiding significance for the transmission design and performance analysis of harmonic gear drive.

Simulation of tuning graphene plasmonic behaviors by ferroelectric domains for self-driven infrared photodetector applications

Nanoscale ◽  
2019 ◽  
Vol 11 (43) ◽  
pp. 20868-20875 ◽  
Author(s):  
Junxiong Guo ◽  
Yu Liu ◽  
Yuan Lin ◽  
Yu Tian ◽  
Jinxing Zhang ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Interfacial Effect ◽  
Infrared Photodetector ◽  
The Finite Element Method ◽  
Ferroelectric Domains ◽  
Element Method

We propose a graphene plasmonic infrared photodetector tuned by ferroelectric domains and investigate the interfacial effect using the finite element method.

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