Discussion on “Effect of a back-e.m.f. non-linearity on responses of a second-order position control system” and “Application of the second method of Lyapunov to the stability of certain position control systems containing a back-e.m.f. non-linearity”

1964 ◽  
Vol 111 (6) ◽  
pp. 1193
Keyword(s):  
Control System ◽  
Control Systems ◽  
Position Control ◽  
Second Order ◽  
Order Position ◽  
The Stability ◽  
Position Control System ◽  
Second Method Of Lyapunov

The Dynamic Characteristics of an Electro-Hydraulic Servovalve

1976 ◽  
Vol 98 (4) ◽  
pp. 395-406 ◽  
Author(s):  
D. J. Martin ◽  
C. R. Burrows
Keyword(s):  
Control System ◽  
Steady State ◽  
Dynamic Characteristics ◽  
Position Control ◽  
Experimental System ◽  
Second Order ◽  
Frequency Responses ◽  
Model Based ◽  
Valve Model ◽  
Position Control System

The frequency responses of an experimental electro-hydraulic position control system and a simulation of the system are compared. Three different valve models are used in the simulation in an attempt to highlight the important parameters of an electro-hydraulic servovalve. It is found that a second order compensated valve model based on steady-state considerations provides a good correlation with the experimental system up to 35Hz and can be used for stability calculations up to 80Hz.

Development of Relay Control Systems of Power and Temperature Mode of Induction Crucible Furnaces with Use of Physical Modeling

2017 ◽  
Vol 906 ◽  
pp. 8-15 ◽  
Author(s):  
A.B. Kuvaldin ◽  
Maxim A. Fedin ◽  
A.O. Kuleshov ◽  
I.Y. Zhmurko
Keyword(s):  
Experimental Study ◽  
Control System ◽  
Control Systems ◽  
Position Control ◽  
Physical Models ◽  
Relay Control ◽  
Temperature Mode ◽  
Crucible Furnace ◽  
Induction Crucible Furnaces ◽  
Position Control System

The physical models of the induction crucible furnaces with nonconducting crucible and conducting crucible were developed. Experimental study of the parameters of an induction crucible furnace for melting of ferromagnetic lumpy charge in ferromagnetic nonconducting crucible was made. Experimental study of the parameters of the furnace for melting copper and magnesium in conducting crucible was made. Three-position control system of active power of induction crucible furnace for melting of ferromagnetic lumpy charge and two-position control system for temperature regime of induction crucible furnaces with conductive crucible were developed.

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