Abstract
In this chapter, the authors present the questions of aviation radioelectronic equipment operation. The structure of operation system is considered based on processes approach with adaptable control principles usage. Operation system contains processes of diagnostics and health monitoring. The authors consider the direct problem of efficiency estimation for diagnostics process, and main attention is paid to probability density function calculation for diagnostics duration. Simulation results were used for adequacy testing of these calculations. The authors also take into account the possibility of first and second kind errors presence. The inverse problem for diagnostics is defined and solved for mathematical expectation of repair time. In general case, the inverse problem can be solved for seven options of optimization.
TopBackground
According to reference (Dhillon, 2006), it can be presumed that the main components of the operation system (OS) are as follows:
- 1.
Structural elements of the operation system and their structure.
- 2.
Technological processes.
- 3.
Executors (engineering personnel maintaining radio flight support facilities).
- 4.
Operational facilities.
- 5.
Administrative regulatory documentation.
- 6.
Consumables.
- 7.
Informational resources.
- 8.
Operational conditions (climatic conditions, electromagnetic compatibility).
Practice shows that important technological processes (TP) for the operation of aviation REE are commissioning, flight and ground monitoring for equipment technical condition, material, and technical supply, recycling, the extension of equipment life, etc.
The process of intended use is the main process of operation. All other processes are designed to maintain the efficiency of the main process.
During the REE operation, the degradation processes can occur. This is due to the influence of the environment, instability of power sources, electromagnetic compatibility, etc. As a result, there are changes in the trend of the diagnostic parameters towards the maximum permissible (pre-failure) levels. Therefore, the purpose of operation system is estimation of the current and future technical condition of REE, on the basis of which it is possible to generate and implement corrective and preventive actions (Solomentsev, Zaliskyi & Zuiev, 2013; Solomentsev, Zaliskyi, Nemyrovets & Asanov, 2015; Solomentsev, Zaliskyi, Kozhokhina & Herasymenko, 2017; Goncharenko, 2018).
The efficiency of the operation system functioning can be regarded as two aspects. The first aspect is related to the effect of the risk on radio flight support equipment and the stability of the air navigation service system functioning. Another aspect of efficiency is related to the minimization of the costs spent on radio flight support facilities.
Block diagram of operation system is shown in Figure 1.
Figure 1. Block diagram of operation system
Key Terms in this Chapter
Error of First Kind: The incorrect decision making about the serviceable condition of REE.
Efficiency of Diagnostics: Probability of correct diagnostics, mean duration of diagnostics, the average cost of diagnostics, average labor intensity of diagnostics.
Direct Problem for Diagnostics: A problem of probability density function calculation for efficiency indexes.
Probability Density Function (PDF): A function which represents the density of a continuous random variable and the likelihood that this random variable takes on some given value.
Operation System: A set of devices, means of operation, personnel, and documentation setting the rules of their cooperation for performing operation tasks. The operation is the stage of device lifecycle at which its quality is realized, maintained, and restored.
Diagnostics: The process of defining the diagnostics object technical condition or searching a failed diagnostics object element.
Error of Second Kind: The incorrect decision making about the non-serviceable condition of REE.
Inverse Problem for Diagnostics: Evaluation of diagnostics process parameters for which the efficiency index has optimum.