Abstract
The issues of improving the effectiveness of information systems by means of serial information redundancy due to an increase in the reliability of control of dangerous flight situations on board aircrafts are considered. The use of microprocessor equipment taking into account the physical principles of connection of sensors to determine dangerous situations on board aircrafts is proposed. The method for serial switching of detectors (with memory), considering a priori information according to the Bayes' method is proposed. The mathematical and graphical dependencies of the a priori probability of fire detection on the sensor quality with the given values of a posteriori probability and the number of repeated requests α=f(P 1 , g, k) are obtained. It is found that, in order to implement serial information redundancy, the following requirements shall be taken into account: high technical reliability of a particular information source; relatively large permissible information aging time; short correlation time of random technical faults, transient failures, fluctuation noise, etc. If the a priori probability a of a controlled phenomenon is low, the probabilities p 1 and p 2 change slowly with increasing k, and the probability p 3 (false alarm) can be quite high, in comparison with the probability of non-detection p 2 . If the probability a is sufficiently high, the probability p 1 effectively increases with increasing k, and the probability of non-detection p 2 will be greater than the probability of false alarm p 3 .
Highlights
The analysis of structures of management information systems (MIS) of the aircraft (AC) fire alarm [1, 2] shows that increasing the number of parallel redundant sensors is an effective way to improve probabilistic characteristics of the system
Serial information redundancy (SIR) is a way to ensure the MIS efficiency, in which the same information source (IS) is requested n times, and a decision is made on the basis of “m of n”, confirmation of the presence of a controlled phenomenon
The research aim is to develop a mathematical model for connecting sensors based on the Bayes’ principle to ensure effective performance of the fire alarm MIS by increasing the accuracy of recognition of a controlled dangerous flight situations (DFS)
Summary
The analysis of structures of management information systems (MIS) of the aircraft (AC) fire alarm [1, 2] shows that increasing the number of parallel redundant sensors is an effective way to improve probabilistic characteristics of the system. The increase in the number of sensors requires certain technical and economic resources It is, advisable to apply a serial method of information redundancy of MIS. Given the low performance of the alarm MIS and extremely complex functions of the crew decision-making, the fire alarm MIS failures are still associated with emergency and catastrophic situations. This is due to the fact that existing MIS have a number of shortcomings:. Improving the reliability of identifying dangerous operating modes of MIS is an urgent task and can be done by introducing information redundancy and creating new structures for failure isolation
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