The unconditional stability for the multigroup multidelays neutral type linear constant control system

1999 ◽  
Vol 4 (4) ◽  
pp. 382-386 ◽  
Author(s):  
Li Ye-ping
Keyword(s):  
Control System ◽  
Neutral Type ◽  
Unconditional Stability ◽  
Constant Control

Development of an Interactive Code for Design and Off-Design Performance Evaluation of Gas Turbines

2009 ◽  
Author(s):  
Behnam Rezaei Zangmolk ◽  
Hiwa Khaledi
Keyword(s):  
Control System ◽  
Gas Turbine ◽  
Gas Turbines ◽  
Combined Cycle ◽  
Design Performance ◽  
Blade Cooling ◽  
Constant Control ◽  
Model Component ◽  
Surge Line ◽  
Cooling Model

In this paper, development of a modular code for simulation of design and off-design performance of different gas turbines (with different shafts and technology) has been described. This interactive code will be used for different purposes in MPG Company. This turbomachinery and thermodynamic model is based on compressor and turbine maps and blade cooling has been considered with a cooling model. Component maps and effect of IGV have been developed from one of 1D, 2D or Q3d in-house codes. It is demonstrated that this model is accurate for prediction of gas turbine behavior at both design and off-design conditions. Effect of various control system — IGV constant, TIT constant and TET constant — is evaluated. These results show that IGV constant control system has the highest and TIT constant have the lowest efficiency for a simple cycle gas turbine. In contrast, the reverse is true in a combined cycle. Also the results show that the compressor is the most stable and away enough from surge line with IGV constant control system and has the highest efficiency.

scholarly journals CONTROL SYSTEM FOR STRUCTURURALLY AND PARAMETRICALLY UNDEFINED NON-AFFINE PLANT WITH NEUTRAL TYPE DELAY AND CONTROL DELAY

2021 ◽  
pp. 110-121
Author(s):  
L.V. Nikiforova ◽  
Keyword(s):  
Control System ◽  
Direct Measurement ◽  
Neutral Type ◽  
State Variables ◽  
Control Delay ◽  
Structural Uncertainties ◽  
Neutral Type Delay ◽  
And Control

The article deals with the synthesis of a controller for non-affine in input plant with neutral type delay and control delay, whose state variables are not available for direct measurement. The controller constructed on the basis of the hyperstability criterion compensates for the effects of delays, interference, parametric and structural uncertainties in the system.

scholarly journals Relaxation of the attainability problem for a linear control system of neutral type

2021 ◽  
Vol 31 (1) ◽  
pp. 70-88
Author(s):  
A.G. Chentsov ◽  
A.N. Sesekin
Keyword(s):  
Control System ◽  
Linear System ◽  
Neutral Type ◽  
Fixed Time ◽  
Linear Control System ◽  
Linear Control ◽  
Attraction Set ◽  
Attainability Domain ◽  
Generalized Controls

The problem of control of a linear system of neutral type with impulse constraints is developed. In addition, a given system of intermediate conditions is assumed. A setting is investigated in which a vanishingly small relaxation of the mentioned restrictions is allowed. In this regard, the attainability domain (AD) at a fixed time of the end of the process is replaced by a natural asymptotic analog, the attraction set (AS). To construct the latter, we use the construction of an extension in the class of finitely additive (f.-a.) measures used as generalized controls. It is shown that the AS coincides with the AD of the system in the class of generalized controls – f.-a. measures. The structure of the mentioned AS is investigated.

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