Analysis of design trade-offs in the rollback recovery method for fault tolerant digital control systems

2002 ◽  
Author(s):  
O.R. Gonzalez ◽  
A. Tejada ◽  
W.S. Gray
Keyword(s):  
Control Systems ◽  
Digital Control ◽  
Fault Tolerant ◽  
Rollback Recovery ◽  
Recovery Method ◽  
Digital Control Systems ◽  
Trade Offs

scholarly journals Digital control systems for power supplies of space vehicles

2018 ◽  
Vol 158 ◽  
pp. 01030
Author(s):  
Andrey Soldatov ◽  
Juriy Shinyakov ◽  
Maxim Sukhorukov
Keyword(s):  
Control Systems ◽  
Digital Control ◽  
Output Voltage ◽  
Fault Tolerant ◽  
Control Unit ◽  
Power Supplies ◽  
Space Vehicles ◽  
Theoretical Studies ◽  
Digital Control Systems ◽  
Channel Control

The principle of building fault-tolerant digital control systems for power supplies of space vehicles is considered in the article. The analysis of the circuits by sampling the controlled component of the output voltage at discrete instants of time is carried out. The possibility of using this approach in multi-channel digital control systems is shown. The results of theoretical studies are confirmed by the example of a four-channel control unit.

Reliability performance of fault-tolerant digital control systems

1991 ◽  
Vol 10 (2) ◽  
pp. 115-128 ◽  
Author(s):  
Henrique M. Paula ◽  
Michael W. Roberts ◽  
Ronald E. Battle
Keyword(s):  
Control Systems ◽  
Digital Control ◽  
Fault Tolerant ◽  
Digital Control Systems ◽  
Reliability Performance

Maximum errors from quantization in multirate digital control systems

AIAA Journal ◽  
1970 ◽  
Vol 8 (4) ◽  
pp. 820-822
Author(s):  
CHARLES L. PHILLIPS ◽  
JOHN C. JOHNSON
Keyword(s):  
Control Systems ◽  
Digital Control ◽  
Digital Control Systems

Digital Instrumentation and Control Failure Events Derivation and Analysis by Frame-Based Technique

2006 ◽  
Author(s):  
Hui-Wen Huang ◽  
Chunkuan Shih ◽  
Swu Yih ◽  
Yen-Chang Tzeng ◽  
Ming-Huei Chen
Keyword(s):  
Control System ◽  
Control Systems ◽  
Digital Control ◽  
Physical Parameters ◽  
Line System ◽  
Core Flow ◽  
Software Failure ◽  
Digital Control Systems ◽  
Cognitive Frame ◽  
Abnormal Condition

A frame-based technique, including physical frame, logical frame, and cognitive frame, was adopted to perform digital I&C failure events derivation and analysis for generic ABWR. The physical frame was structured with a modified PCTran-ABWR plant simulation code, which was extended and enhanced on the feedwater system, recirculation system, and steam line system. The logical model is structured with MATLAB, which was incorporated into PCTran-ABWR to improve the pressure control system, feedwater control system, recirculation control system, and automated power regulation control system. As a result, the software failure of these digital control systems can be properly simulated and analyzed. The cognitive frame was simulated by the operator awareness status in the scenarios. Moreover, via an internal characteristics tuning technique, the modified PCTran-ABWR can precisely reflect the characteristics of the power-core flow. Hence, in addition to the transient plots, the analysis results can then be demonstrated on the power-core flow map. A number of postulated I&C system software failure events were derived to achieve the dynamic analyses. The basis for event derivation includes the published classification for software anomalies, the digital I&C design data for ABWR, chapter 15 accident analysis of generic SAR, and the reported NPP I&C software failure events. The case study of this research includes (1) the software CMF analysis for the major digital control systems; and (2) postulated ABWR digital I&C software failure events derivation from the actual happening of non-ABWR digital I&C software failure events, which were reported to LER of USNRC or IRS of IAEA. These events were analyzed by PCTran-ABWR. Conflicts among plant status, computer status, and human cognitive status are successfully identified. The operator might not easily recognize the abnormal condition, because the computer status seems to progress normally. However, a well trained operator can become aware of the abnormal condition with the inconsistent physical parameters; and then can take early corrective actions to avoid the system hazard. This paper also discusses the advantage of Simulation-based method, which can investigate more in-depth dynamic behavior of digital I&C system than other approaches. Some unanticipated interactions can be observed by this method.

Sign in / Sign up

Export Citation Format

Share Document