scholarly journals RESEARCH OF CONDITIONAL DIAGNOSTIC ALGORITHMS MANY SOURCE OBJECTS

2021 ◽  
Vol 3 (65) ◽  
pp. 139-142
Author(s):  
L. Sakovych ◽  
S. Gnatiuk ◽  
S. Voloshko ◽  
Yu. Miroshnichenko
Keyword(s):  
Power Supply ◽  
Structural Features ◽  
Technical Diagnostics ◽  
Considerable Time ◽  
Diagnostic Algorithms ◽  
Mean Time ◽  
Element Base ◽  
Secondary Power

Without regard to the swift increase of reliability of element base of modern special communication means actual is a question of providing of their a fitness is to repair, of value of indexes of that regulated by leading documents. Considerable time of permanent repair of special communication means occupies the search of defective elements, that is why important enough improvement of the diagnostic providing. It is arrived at by the use of effective algorithms of searching activity of masters that abbreviate the necessary amount of verifications of the damaged apparatus. It is set that to 30 percent of refuses of special communication means conditioned by disrepairs their sources of secondary power supply, that behave to the class of many source objects. In the article with drawing on modern accomplishments of technical diagnostics and metrology, that was not taken into account before, research possible variants of construction of conditional diagnostic algorithms. Also research their indexes of quality dependin g on the structural features of object of diagnosticating and the brought results over of comparison. The terms of repressing choice of algorithms of search of defects are set on the criterion of a minimum of mean time of renewal, the order of decision of this task is formalized. The got results it is expedient to draw on during development of the diagnostic providing of perspective special communication means, and also and at the improvement of existing. Thus, taken off part of limitations that is used in the known methodologies, that allows to promote efficiency scientifically reasonable practically implemented recommendations in relation to time of proceeding in special communication means at the refuse of their sources of secondary power supply

scholarly journals ASSESSMENT OF THE INFLUENCE OF THE DESIGN ON THE RELIABILITY OF RADIO ELECTRONIC MEANS

2020 ◽  
Vol 2 (36) ◽  
pp. 55-62
Author(s):  
L. Sakovich ◽  
◽  
Yu. Мiroshnichenko ◽  
М. Yakovlev ◽  
M. Borisenko ◽  
...  
Keyword(s):  
Power Supply ◽  
Quantitative Assessment ◽  
Technical Diagnostics ◽  
Radio Electronic ◽  
Additional Costs ◽  
Reasonable Choice ◽  
The Cost ◽  
The Impact ◽  
Element Base ◽  
Diagnostic Support

The article discusses approaches to ensuring the required level of reliability of radio electronic means when designing the design of products, taking into account the metrological and diagnostic support during their operation. It is known that up to 80% of the current repair time is occupied by the search for defects, therefore, special attention is paid to the influence of the product design on minimizing the average diagnosis time. The quantity of elements of modern radio electronic means is constantly increasing due to the expansion of their functions and automation of technological operations, but the requirements for their reliability remain constant. This contradiction can be solved by increasing the reliability of the element base, which leads to an increase in the cost of the product, which is not always acceptable. Therefore, there is a problem of providing the necessary values of reliability in other ways, including taking into account the requirements of maintainability of products in the design, as well as improving metrological and diagnostic maintenance during operation in real conditions using modern advances in metrology and technical diagnostics. Thus, there is a problem of quantitative assessment of the impact of the design of radio electronic means on their reliability, as well as a reasonable choice of recovery options for maintenance in the minimum time. This will provide the required values of reliability without additional costs during the operation of radio electronic means. Possible options for restoring the operability of multi-output objects, which include power supply subsystems, are considered. It is shown that a reasonable choice of design, metrological and diagnostic support reduces the time of current repair by up to 30%. The use of the results obtained in the design of promising and existing radioelectronic devices for various purposes makes it possible to increase the efficiency of current repairs in real conditions.

Ensuring electrical safety of power supply systems of electrified AC railways for highspeed lines

2018 ◽  
Vol 77 (6) ◽  
pp. 337-346 ◽  
Author(s):  
A. B. Kosarev ◽  
A. V. Barch ◽  
E. N. Rozenberg
Keyword(s):  
Power Supply ◽  
High Speed ◽  
Structural Features ◽  
Electrical Safety ◽  
Safe Operation ◽  
Ballastless Track ◽  
Conventional Structure ◽  
Artificial Earth ◽  
Earth Connection ◽  
Supply Systems

Abstract. High-speed railways are fast-growing and promising type of traffic. In Russia development of high-speed railway service is associated with the solution of a number of problems, including infrastructure. Authors propose to use earth connection of the railway catenary with the help of an artificial earthing switch on currently designed high-speed line Moscow—Kazan for 2×25 kV power supply system. Taking into account requirements for electrical safety conditions for maintenance of the track and earthed catenary supports, paper justifies method for calculating allowable voltages of rail—earth points and supports of catenary. Methods takes into account structural features of ballastless track superstructure used for high-speed lines. It is estimated that the voltages admissible under the electrical safety conditions are random in nature and distributed logarithmically normal. When calculating probability of safe operation, one should take into account random nature of both permissible stresses and those actually occurring on the track. It is estimated that the probability of safe operation in traction networks of sections with ballastless track superstructure does not exceed a similar value in electrified sections with the conventional structure of a ballast prism. Feasibility of using a 2×25 kV earth system using an artificial earth connection is confirmed, recommendations on its use are given. Authors substantiate allowable values of the rail—earth voltage and catenary supports, which practically exclude the occurrence of hazardous situations for personnel maintaining the track in sections with ballastless track superstructure.

scholarly journals Secondary power systems for videometric complex "Fregat"

2018 ◽  
Vol 30 ◽  
pp. 134-142
Author(s):  
Pavlin Gramatikov ◽  
Roumen Nedkov ◽  
Doino Petkov
Keyword(s):  
Power Systems ◽  
Power Supply ◽  
Measuring Equipment ◽  
Short Circuit ◽  
Technical Documentation ◽  
Supply Systems ◽  
Secondary Power

The power supply for the video-spectrometric complex (VSC) "Fregat" is being considered. This secondary power supply systems have the following functions: Reception and switching of the voltages; Protection from overload and short circuit in the internal circuits and the exit circuits; Transformation of primary voltage in stabilized secondary voltages; Galvanically untethered secondary circuits by primary and Hull; Protection of the users from the electromagnetic noises; Provision of "Cold" and "Hot" reserve, etc. A set of technical documentation and test-measuring equipment for testing were created. Four sets of Secondary Power Systems for "Fregat" are designed and implemented for two flights to planet Mars.

scholarly journals Construction of a local location program on the basis of “decision tree”

2019 ◽  
Vol 68 (2) ◽  
pp. 165-175
Author(s):  
Przemysław Duer ◽  
Stanisław Duer ◽  
Paweł Wrzesień
Keyword(s):  
Decision Tree ◽  
Power Supply ◽  
Fault Location ◽  
Power Supply System ◽  
Supply System ◽  
Decision Making Process ◽  
Technical Diagnostics ◽  
Technical Device ◽  
Damage Location ◽  
Analysis Process

The article presents the problems of building a damage location program in a technical facility based on the theory of the “decision tree”. The basis in such a decision-making process is the functional and diagnostic analysis of the tested technical device. The result of this analysis process is a set of basic (functional) elements with a set of weighting factors assigned to them. An algorithm of fault location is developed in the theory of the “decision tree” in the process of locating faults in the tested vehicle power supply system. Keywords: technical diagnostics, diagnostic reasoning, artificial intelligence.

The Bakerian Lecture: Molecular structure in the polysaccharide group

1959 ◽  
Vol 252 (1270) ◽  
pp. 287-312 ◽  
Keyword(s):  
Molecular Structure ◽  
Fine Structure ◽  
Biological Function ◽  
Structural Features ◽  
Molecular Structures ◽  
Molecular Architecture ◽  
Considerable Time ◽  
General Acceptance ◽  
Naturally Occurring ◽  
Precise Knowledge

It has been clear for some considerable time that a more precise knowledge of the molecular structure of the polysaccharides is needed for the solution of many problems in biology and medicine. This was emphasized by Sir Norman Haworth in the Bakerian Lecture delivered in 1944, when he reviewed the position then reached concerning the structure, biological function and synthesis of typical polysaccharides. In this connexion it is of interest to recall that by 1944 the view that naturally occurring colloidal substances such as starch and cellulose possessed molecular structures held together by normal co-valent bonds had received general acceptance for less than 20 years. Furthermore, the evidence for the main structural features of the polysaccharides had been acquired by difficult and laborious experimental methods which normally involved the manipulation of large quantities of material. Some idea of the general molecular architecture of many polysaccharides had been gained, but the methods then available were not capable of delving much deeper into the detailed structural features. This fine structure is nevertheless of particular importance, since the presence of irregular features in the molecule, even in slight degree, may alter quite markedly the behaviour of these high polymers. It will be readily understood also that the fine structure of these macromolecules is a matter of great moment in enzymology.

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