Accurate frequency domain modelling of coaxially driven axisymmetric microwave structures

1994 ◽  
Vol 4 (12) ◽  
pp. 390-392 ◽  
Author(s):  
H.O. Ali ◽  
G.I. Costache
Keyword(s):  
Frequency Domain ◽  
Domain Modelling ◽  
Microwave Structures

Mixed time–frequency domain simulation of a hydraulic inductance pipe with a check valve

2011 ◽  
Vol 225 (10) ◽  
pp. 2413-2421 ◽  
Author(s):  
R Scheidl ◽  
B Manhartsgruber ◽  
H Kogler
Keyword(s):  
Frequency Domain ◽  
Check Valve ◽  
Buck Converter ◽  
Frequency Domain Method ◽  
Parameter Study ◽  
Algebraic Equations ◽  
Efficient Computation ◽  
Time Frequency ◽  
Linear Algebraic Equations ◽  
Domain Modelling

This paper deals with the efficient computation of hydraulic switching systems with a check valve by a mixed time–frequency domain method; frequency-domain modelling is performed on the wave propagation in a pipe and time-domain modelling is applied to the switching valve and the check valve. The dual property of the check valve makes the complete problem have variational inequality properties. A solution method is presented which replaces the pressure and the flowrate of the check valve as a function of one new variable. The resulting system of non-linear algebraic equations is solved using a Newton–Raphson method in combination with a smoothing of the non-smooth properties of the check valve. The method is applied to a parameter study of a hydraulic buck converter.

Numerical study on accuracy of frequency-domain modelling of transients

2017 ◽  
Vol 55 (6) ◽  
pp. 813-828 ◽  
Author(s):  
Caterina Capponi ◽  
Aaron C. Zecchin ◽  
Marco Ferrante ◽  
Jinzhe Gong
Keyword(s):  
Frequency Domain ◽  
Numerical Study ◽  
Domain Modelling
Sign in / Sign up

Export Citation Format

Share Document