Study on Stability of Thermal Control Automation System in Power Plant

ATC (air traffic control) automation system is a complex system, which helps maintain the air traffic order, guarantee the flight interval, and prevent aircraft collision. It is essential to ensure the safety of air traffic. Failure effects evaluation is an important part of ATC automation system reliability engineering. The failure effects evaluation of ATC automation system is aimed at the effects of modules or components which affect the performance and functionality of the system. By analyzing and evaluating the failure modes and their causes and effects, some reasonable improvement measures and preventive maintenance plans can be established. In this paper, the failure effects evaluation framework considering performance and functionality of the system is established on the basis of reliability theory. Some algorithms for the quantitative evaluation of failure effects on performance of ATC automation system are proposed. According to the algorithms, the quantitative evaluation of reliability, availability, maintainability, and other assessment indicators can be calculated.

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Evaluation of Model-Based Control of Reaction Forces at the Supports of Large-Size Crankshafts

Sensors ◽

10.3390/s20092654 ◽

2020 ◽

Vol 20 (9) ◽

pp. 2654 ◽

Cited By ~ 3

Author(s):

Leszek Chybowski ◽

Krzysztof Nozdrzykowski ◽

Zenon Grządziel ◽

Lech Dorobczyński

Keyword(s):

Current System ◽

Geometric Condition ◽

Automation System ◽

Element Analysis ◽

Large Size ◽

Support Reaction ◽

Crank Angle ◽

Phase Shift Angle ◽

Control Automation ◽

Reaction Forces

A support control automation system employing force sensors to a large-size crankshaft main journals’ flexible support-system was studied. The current system was intended to evaluate the geometric condition of crankshafts in internal combustion diesel engines. The support reaction forces were changed to minimize the crankshaft elastic deflection as a function of the crank angle. The aim of this research was to verify the hypothesis that the mentioned change can be expressed by a monoharmonic model regardless of a crankshaft structure. The authors’ investigations have confirmed this hypothesis. It was also shown that an algorithmic approach improved the mathematical model mapping with the reaction forces due to faster and more accurate calculations of a phase shift angle. The verification of the model for crankshafts with different structural designs made it possible to assess how well the model fits the coefficients of determination that were calculated with the finite element analysis (FEA). For the crankshafts analyzed, the coefficients of determination R2 were greater than 0.9997, while the maximum relative percentage errors δmax were up to 1.0228%. These values can be considered highly satisfactory for the assessment of the conducted study.

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Command and Control System Executable Modeling Researching

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.629.864 ◽

2012 ◽

Vol 629 ◽

pp. 864-867

Author(s):

Xue Song Tang ◽

Qing Hua Meng ◽

Zhi Hong Dong ◽

Da Guang Lou

Keyword(s):

Control System ◽

Command And Control ◽

Automation System ◽

Analysis And Design ◽

Uml Modeling ◽

Architecture Evaluation ◽

Control Automation ◽

And Performance ◽

And Control ◽

Command And Control System

We proceed from the perspective of object-oriented analysis and design modeling, focusing on the model design of command and control automation system, using Colored Petri Net (CPN) to a command and control systems for dynamic design and simulation run. A method of mapping from UML product can be used for logical, behavioral and performance aspects of architecture evaluation methods of CPN executable models is proposed. We first descript the command and control system for UML modeling generally, and then elaborate the process from UML products are mapped to the CPN build executable model of the command and control system.

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