scholarly journals The coupled/quasi-static approximation in one-dimensional linear thermoelasticity

2000 ◽  
Vol 58 (3) ◽  
pp. 523-542 ◽  
Author(s):  
Richard J. Weinacht
Keyword(s):  
Static Approximation ◽  
One Dimensional ◽  
Quasi Static Approximation ◽  
Linear Thermoelasticity

scholarly journals The Investigation of Coupling between Matching Circuit and Input Resonators of Channels in a Microstrip Diplexer

2020 ◽  
pp. 871-881
Author(s):  
Aleksey O. Afonin ◽  
Andrey A. Leksikov ◽  
Alexander A. Leksikov ◽  
Ilya V. Govorun ◽  
Alexey M. Serzhantov ◽  
...  
Keyword(s):  
Computer Program ◽  
Microstrip Line ◽  
Coupling Coefficients ◽  
Fractional Bandwidth ◽  
Static Approximation ◽  
One Dimensional ◽  
Quasi Static Approximation ◽  
A Value ◽  
Mathematical Expressions ◽  
The Common

This paper deals with investigation of the coupling coefficients between the matching circuit and the input resonators of channels in a microstrip diplexer. Diplexer channels are two-section filters, and matching circuit is regular non-resonant segment of a microstrip line placed between input resonators of channels. The common port is connected to outer end of the segment and its second end is opened. Research was carried out theoretically using a computer program developed on the basis of mathematical expressions obtained by means of one-dimensional models and quasi-static approximation. The results show that a value of coupling is quite large and the use of the matching circuit in a form of a non-resonant segment of a microstrip line allows to design diplexers with wide fractional bandwidth of the channels

The role of advection in the quasi-static approximation

1994 ◽  
Vol 432 ◽  
pp. 302 ◽  
Author(s):  
Shlomi Pistinner ◽  
Giora Shaviv
Keyword(s):  
Static Approximation ◽  
Quasi Static Approximation

Sources of Fatigue in Random-Vibration Durability of Surface Mount Interconnects

2009 ◽  
Author(s):  
Y. Zhou ◽  
M. Al-Bassyiouni ◽  
A. Dasgupta
Keyword(s):  
Accumulation Rate ◽  
Random Excitation ◽  
Additional Stress ◽  
Dynamic Mode ◽  
Dynamic Prediction ◽  
Element Analysis ◽  
Static Approximation ◽  
Quasi Static Approximation ◽  
Dynamic Movement ◽  
Resonant Modes

The transient response of a PBGA256 assembly to random excitation is explored with quasi-static and transient finite element analysis, as well as with experiments. The quasi-static approximation is based on the first modal contribution to the measured PWB response. The dynamic prediction for solder strain and resulting damage accumulation rate are found to be significantly larger than in the quasi-static approximation. The quasi-static model is clearly missing additional stress drivers such as the dynamic movement of the component relative to the PWB and higher resonant modes of PWB flexure. The dynamic mode of the component is verified in this paper with two accelerometers placed on the component and on the PWB. Investigation of the higher modes of the PWB is deferred to a future study.

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