scholarly journals A method of determining microwave dissipation of Josephson junctions with non-linear frequency response

2019 ◽  
Vol 68 (11) ◽  
pp. 118501
Author(s):  
Heng-Jie Chen ◽  
Hang Xue ◽  
Shao-Xiong Li ◽  
Zhen Wang
Keyword(s):  
Frequency Response ◽  
Josephson Junctions ◽  
Linear Frequency ◽  
Non Linear

scholarly journals Design of the Squared Daisy: A Multi-Mode Energy Harvester, with Reduced Variability and a Non-Linear Frequency Response

Sensors ◽  
2019 ◽  
Vol 19 (15) ◽  
pp. 3247 ◽  
Author(s):  
Mathieu Gratuze ◽  
Abdul Hafiz Alameh ◽  
Frederic Nabki
Keyword(s):  
Frequency Response ◽  
Energy Harvester ◽  
Traditional Approach ◽  
Linear Frequency ◽  
Energy Harvesters ◽  
Wide Range ◽  
Non Linear ◽  
Operating Bandwidth ◽  
Different Characteristics ◽  
The Internet Of Things

With the rise of the Internet of Things (IoT) and the ever-increasing number of integrated sensors, the question of powering these devices represents an additional challenge. The traditional approach is to use a battery; however, harvesting energy from the environment seems to be the most practical approach. To that end, the use of piezoelectric MEMS energy has been proven as a potential power source in a wide range of applications. In this work, a proof of concept for a new architecture for MEMS energy harvesters is presented. The influence of the dimensions and different characteristics of these designs is discussed. These designs have been proven to be resilient to process variation thanks to their unique architecture. This work presents the use of vibration enhancement petals in order to widen the bandwidth of the energy harvester and provide a non-linear frequency response. The use of these vibration enhancement petals has allowed the fabrication of three design variations, each using an area of 1700 µm by 1700 µm. These designs have an operating bandwidth between 3.9 kHz and 14.5 kHz and can be scaled to achieve other targeted resonant frequencies.

Non-linear Frequency Response and Stability Analysis of Piezoelectric Nanoresonator Subjected to Electrostatic Excitation

2019 ◽  
Vol 20 (5) ◽  
pp. 601-621 ◽  
Author(s):  
Sayyid H. Hashemi Kachapi ◽  
Morteza Dardel ◽  
Hamidreza Mohamadi daniali ◽  
Alireza Fathi
Keyword(s):  
Stability Analysis ◽  
Differential Equations ◽  
Boundary Conditions ◽  
Frequency Response ◽  
Surface Elasticity ◽  
Assumed Mode Method ◽  
Linear Frequency ◽  
Non Linear ◽  
Mode Method ◽  
Parametric Studies

AbstractThe effects of surface energy on the non-linear frequency response and stability analysis of piezoelectric cylindrical nano-shell as piezoelectric nanoresonator are investigated in the current paper using Gurtin–Murdoch surface elasticity and von Karman–Donnell’s theory. The nanoresonator is embedded in visco-Pasternak medium and electrostatic excitation. The governing equations and boundary conditions are derived using Hamilton’s principle and also the assumed mode method is used for changing the partial differential equations into ordinary differential equations. Complex averaging method combined with arc-length continuation is used to achieve an approximate solution for the steady-state vibrations of the system. The validation of the mentioned system is achieved with excellent agreements by comparison with numerical results. The parametric studies such as the effects of geometrical and material properties, different boundary conditions, the ratio of length to radius $L/R$ for different values of the voltages ${V_{{\rm{DC}}}}$ and ${V_{{\rm{AC}}}}$, the gap width of the nanoresonator $b/L$, the effect of the voltages ${V_{{\rm{DC}}}}$ and ${V_{{\rm{AC}}}}$ and also the effect of piezoelectric voltage ${V_p}$ are conducted on the non-linear frequency response and stability analysis of the piezoelectric nanoresonator.

Impact of flame base dynamics on the non-linear frequency response of conical flames

2013 ◽  
Vol 341 (1-2) ◽  
pp. 171-180 ◽  
Author(s):  
Alexis Cuquel ◽  
Daniel Durox ◽  
Thierry Schuller
Keyword(s):  
Frequency Response ◽  
Linear Frequency ◽  
Non Linear
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