Background. The article discusses integrated piezoresistive converters based on monocrystalline silicon. The operation of the built-in thermal compensation circuit with additional thermistors and the features of its operation are analyzed. Materials and methods. The applicability of thermistors with positive and negative temperature coefficients of resistance to improve the parameters of the thermal compensation circuit is considered. Results and conclusions. Circuit modeling of an improved thermal compensation circuit was carried out over a wide temperature range. The advantages of an improved thermal compensation circuit are shown.

Background. The relevance of the work is due to the fact that the methods used in the monitoring and diagnostic system do not fully use new approaches using new information technologies. This occurs due to the lack of possibility of instrumental assessment of some technical characteristics and their values. These characteristics are usually called attributes, since it is impossible to determine their value quantitatively. The purpose of the work is to study the possibility of creating a database for a monitoring and diagnostic system that would allow specialists with an insufficient level of training and knowledge to diagnose and eliminate complex faults (system failure, uncharacteristic failure, "floating" defect), in cases where there is no possibility, transfer of experience and knowledge to more experienced employees. Materials and methods. This paper discusses a method for formalizing quantitative decisions, data from the control system, described by experts, and the application of the theory of fuzzy sets. This method allows you to obtain up-to-date information, which in turn makes it possible to develop more modern diagnostic systems with higher quality. Results and conclusions. The proposed approach can significantly reduce the effort and time spent searching for a failure location, as well as improve the quality of inspection results. When using fuzzy logic algorithms or neural network technologies, it is possible to improve the quality of control and diagnostics.

Background. The method of registration of maintenance and repair of pipeline fittings using RFID technology (Radio Frequency Identification, radio frequency identification) is considered. The proposed method makes it possible to simplify and automate the process of collecting information about the time and content of work on maintenance and repair of pipeline fittings, and thus strengthen control over its implementation. This increases the reliability and safety of equipment operation. The necessity of regular and high-quality MRO of TPA is justified. Materials and methods. The methods of automated data collection on the performed maintenance and repair work and the condition of the crane assembly and their recording in an RFID tag are described. The composition of the hardware of the installation for automated registration of the pipeline fittings is analyzed. Results and conclusion. A protocol for recording data on maintenance and repair of pipeline fittings into an RFID tag is proposed in order to simplify and partially automate the process of collecting information about maintenance and repair and strengthen control over its conduct. The analysis of the capabilities of RFID tags and the organization of the RFID tag memory structure is carried out and a list of information recorded during registration of work necessary for quantitative and qualitative assessment of the conducted maintenance and repair of pipeline fittings is described. The minimum list of equipment necessary for the implementation of the hardware of the installation for the registration of maintenance is described, a description of the operation of this installation and its block diagram is given. The conclusion is made about the necessity and relevance of the application of the proposed method of registration of information on the conduct of maintenance and repair of pipeline fittings.

Background. The study is aimed at adapting, applying and developing distributed artificial intelligence technologies for the issues of information and analytical support of situational centers at the regional level and efficiency enhancement of their operation when managing the security and resilience of critical infrastructures. Digitalization of situational control requires the development and implementation of adaptive self-organizing systems based on knowledge and with high autonomy, pro-activeness and interoperability. Materials and methods. The work is based on a comprehensive analysis and generalization of the well-known methodological approaches potential to the engineering of applied multi-agent systems, as well as modern practices for the synthesis of network-centric systems for situational control of distributed objects. The methods and tools for designing multi-agent systems are reviewed. Results and conclusions. A generic methodology for multi-agent systems engineering to support the management of critical infrastructures resilience, based on the combined use of the principles of analysis and synthesis of security systems for critical facilities, adaptive situational control systems and agent-based applications, has been developed. A distinctive feature of the methodology is the expansion of the functionality of known technological solutions in terms of the implementation of a simulation apparatus within the agents and a unit for joint activities coordination through «untying interactions» and self-organization of the agents into coalitions based on the model of gradient computational fields. This will improve the performance of systems for ensuring the critical infrastructures security and resilience used in situational centers by maintaining a high level of controllability, adaptability and intelligentization of these systems applying multi-agent technologies.

Background. Development of a methodological apparatus for constructing means to ensure the required level of probability of failure-free operation and survivability of self-healing specialized computers (SEVMs). During the research, an analysis of operating conditions and a selection of reliability indicators for computers of aerospace equipment was carried out. Requirements for computer backup methods are formulated. A comparative assessment of the detecting ability and hardware costs was carried out when implementing the majority redundancy method, the duplication method and the use of correcting codes. Materials and methods. The expediency of using the duplication method is substantiated to increase the probability of failure-free operation and survivability of self-healing central computers, using algebraic linear codes to identify a faulty backup channel. Unlike known codes, it is proposed to use an algebraic linear code, in which the values of the check bits correspond to the direct and inverse values of the information bits, which makes it possible to detect errors when reading information from the inverse outputs of the memory, correct single errors, detect double errors and control the logical inversion operation, necessary to represent a negative number in two's complement code, which makes it possible to adapt the code to control arithmetic and logical operations of the computer processor. An assessment was made of the probability of failure-free operation of a duplicated computer, with its general redundancy, with detection and correction of single errors in the backup memory channels and detection of errors in the backup channels of the processor ALU based on the proposed code, and an assessment of the probability of failure-free operation of the computer, with its separate redundancy, with error detection in the backup channels of the duplicated memory based on the Hamming code and error correction in the backup channels of the processor ALU based on the majority method. Results and conclusions. As a result of comparing the probabilities of failure-free operation, it was established that the general redundancy of the computer based on the proposed code, in comparison with the separate redundancy of the memory and ALU of the computer processor, allows for a gain in the probability of failurefree operation of the computer and its functional devices throughout the entire period of operation.

Background. Inertial switches are used in mobile objects for switching of electrical circuits of technical systems. Operation of similar devices happens generally at a set of integral of linear acceleration with which an object moves in space. For integration of linear acceleration magnetic-induction and hydraulic dampers are traditionally used. In some cases hydraulic dampers as the simplifying designs of inertial switches, are more preferable. In work results of development of a design of the inertial switch with hydraulic damping of an inertial body are presented, its mathematical model – the worked-out differential equations describing movements of mobile structural elements and also conditions of a start of motion is given. Materials and methods. By drawing up the differential equations the following assumptions were accepted: we consider liquid incompressible; changes of the sizes of details of the inertial switch due to temperature change of the environment from nominal are not considered; change of viscosity of the damping liquid from temperature change of the environment from normal is not considered. The main feature of the developed design of the inertial switch distinguishing it from inertial devices of similar appointment – use of the additional magnetic system providing the «falling» power system performance an inertial body – a working spring with the minimum power impact of a magnetic system on an inertial body on the initial site of its movement and sharply increasing power influence on the final site, sufficient for reliable switching of a contact system with the increased number of the contacts providing transmission of currents in the wide range of values with small voltage drops in contact transition. Switching of a contact system from an initial state happens at forward movement of a switching element of a contact system towards to an inertial body to overcoming effort of a working spring and forces of inertia operating on a switching element. The design of the developed inertial switch provides with specially entered blocking elements reliable preservation of an initial condition of a contact system in all service conditions of mobile objects in which it can be used. Results and conclusions. The presented results of works show a possibility of creation of the reliable and technological inertial switch intended for the technical systems of autonomous mobile objects.

Background. Electromagnetic polarized switches are used in land-based vehicles to commutate the electric circuits in a system. There is a wide variety of industrially available commutating devices, but few of them are applicable for the above purpose due to weight and size limitations. Moreover, the commutating devices are often operated in high-current circuits, requiring retaining of both initial and tailored states of high probability, and reliability under hard impacts and vibrations as well. The above devices are triggered by applying voltage to winding controls. The work provides a design of the electromagnetic polarized switch, suitable for application in both low– and high-current electric circuits of different engineering systems: aircrafts, mobile and stationary facilities. The electromagnetic polarized switch relies upon gained backup contacts of two-sided multipoint contacting to make possible commutation and cutoff of both low and high currents with stable electrical parameters during the long operation life, eliminating closed contacts chatter under significant shock and vibration effects. Materials and methods. Designed electromagnetic switch provides: sizeable moment of retention of the turning armature in the absence of power, that keeps initial and switched state of the contact system; driving moment, produced by the turning armature, suffices for reliable switching of the contact system; augmented angle of the armature turning, that enables use of reliable gained contacts to sustain stable electric parameters for a long operational life, including one under inductive load; power-saving consumption; automatic switch-off power on the control windings when switching state. Results and conclusions. It follows from the resulting calculations of work that during and after the effect of single longwise half-sinusoidal mechanical impact of designed parameters on the switch, the interaction in every couple «spring contact – bridge cutter», retaining the contact transition, is of «gliding» or «glued» type, that excludes contacts chatter. Absence of contacts chatter under impacts and vibration loads is also proved by tests.

Background. When choosing a mathematical model of reliability of non-recoverable items, it is necessary to know in advance the conditions under which the mean operating life is finite and when it is infinite. Therefore, the actual problem is to find signs of convergence and divergence of operating life integrals. Materials and methods. In this paper, estimating the mean operating life through a function of the failure rate of non-recoverable items, sufficient conditions for convergence and divergence of operating life integrals are found. Results. On the basis of the found signs of convergence and divergence of integrals of the operating life of non-recoverable items, the conditions of limitation and unlimited values of the mean operating life are determined. Conclusions. Sufficient conditions for convergence and divergence of integrals of the operating life of non-recoverable items are proved. Examples of the use of the obtained results are given.

Background. Solving the problem of choosing the optimal parameters, as well as diagnosing and predicting the technical condition of aircraft equipment components, necessitates the construction of a model of this components. At the input of the models, the measured characteristics are fed, and the controlled characteristics are obtained at the output. The authors proposed a method of mathematical prototyping of energy processes, allowing to build adequate mathematical models (which do not contradict the general physical laws) of the dynamics of physical and chemical processes of various nature. Then these equations are converted to models that are directly used to solve the mentioned practical problems. To simplify calculations, it is necessary to correctly set the analytical approximation of solutions to differential equations of the method of mathematical prototyping of energy processes. This determines the urgency of the mentioned problem. Matherials and methods. In the case of using special methods for solving a system of differential equations, it is necessary to specify an approximate analytical expression for the solution (general or particular) of the system being solved, the coefficients of which are determined from the system of equations being solved. The analytical approximation of the solution of systems of differential equations of the method of mathematical prototyping of energy processes is based on the concept of the system tending to some stationary state, which changes as a result of feedback. Results. The proposed method for setting the analytical approximation of solutions to the equations of the method of mathematical prototyping of energy processes makes it possible to set a class of correct mathematical models (which do not contradict the general physical laws, as well as the features of the flow of physical and chemical processes in a particular system under consideration) of various components of aviation equipment. In such a class, models are built (methods of identification theory, machine learning, etc.) with the lowest computational costs. Conclusions. Qualitative analysis of the equations of the method of mathematical prototyping of energy processes makes it possible to specify the most narrowed class of mathematical models, in which an adequate mathematical model of the required accuracy of an arbitrary system is built with the lowest computational costs.

Background. Artificial intelligence algorithms for control systems of robotic complexes are also products, the quality of which must be confirmed by test results. Materials and methods. Proposals have been developed for the methodology for conducting virtual tests of ArUco fiducial marker recognition algorithms, which are widely used in robotics. Results and conclusions. Reliability indicators are determined, according to which it is proposed to evaluate the quality of artificial intelligence technologies.