Purpose of research is to develop and test a technique and perform an experimental study of the vibration strength of D16 aluminum alloy joints welded applying resistance spot welding.

Methods. Test coupons were made from 1 mm thick D16 aluminum alloy sheet blanks applying resistance spot welding. A feature of the proposed test is the implementation of a symmetrical loading cycle. During the tests, the number of cycles to failure depending on the range of vibrations was recorded. Annealing and thermomechanical straightening were carried out to exclude helical bending after cutout. After deburring and root facing, the surface of the coupons was prepared for welding using chemical etching. The coupons were welded using a TECNA 8214N spot welding machine. The welding current was 30 kA, the welding duration was 0.1 s, the electrodes force was 180 daN. The static shear strength of the welded joint was studied using a UTS 110M-5 1-U tensile testing machine. The breaking force was 3.66 kN. The peculiarity of the proposed test is the implementation of a symmetrical loading cycle. During the tests, the number of cycles to failure depending on the range of vibrations was recorded.

Results. As a result of the statistical analysis of the study results, a linear mathematical relationship between the logarithms of the number of cycles to failure and the amplitude of vibrations was obtained. Depending on the range of vibrations, characteristic zones of destruction were revealed. To provide the possibility of comparing the results of vibration obtained under different conditions of fixing the samples, it is proposed to use the range of vibration displacement per unit length of the work[iece as the ordinate.

Conclusion. A technique or studying the vibrational strength of joints welded by resistance spot welding under conditions of a symmetrical loading cycle is proposed and tested. For the studied coupons, the equality of the welded joint to the base metal is achieved at the value of the logarithm of the ratio of the range of vibration displacement per unit length of the coupons equal to 0.01.

Purpose of research. Is to develop a layout of an experimental setup that allows conducting research with elastic elements by exercising a force impact on them as well as automatic data collection and analysis, which allows determining the stiffness coefficient and investigating simple harmonic oscillations.

Methods. The developed device makes it possible to determine elasticity coefficient of the spring applying two methods – static and dynamic. The dynamic method requires strict adherence to a certain procedure of experimental stydy. In this case, the system under study is under the action of a restoring force directly proportional to the displacement, i.e. it is a simple generator of harmonic oscillations. The prototype of the experimental setup being created includes a supporting structure, a control system to which an ultrasonic distance measurement sensor is connected, and a special mobile application that allows visualizing and recording the results of measurements in a user-friendly form.

Results. The developed prototype makes it possible to determine spring deformation by static and dynamic methods; the presence of a special mobile application for devices with the Android operating system allows the user to control the device from his mobile phone. The experimental device allows visualizing the obtained data graphically and export them to a file of variable values. Exported values are displayed in tabular form for further processing using statistical tools or numerical computing applications.

Conclusion. To improve the quality of the educational and training process of physics students it is necessary to introduce special equipment for experimental research into the educational process. Such equipment can be applied in the studies conducted in various sections of mechanics, including kinematics, oscillatory motion, impact, elasticity, etc.

Рurpose of research. The most energy-intensive facilities for holding sports and cultural events are indoor ice rinks and ice arenas. Simplified technical solutions when designing the systems for providing the microclimate of these structures lead to significant operating costs and can lead to serious negative consequences in a relatively short period. In this regard, the problem of developing methods for choosing the optimal design solution for these systems is becoming ever more urgent. The purpose of the article is to develop a mathematical model for multi-criteria optimization of design solutions for systems providing the microclimate of rooms with artificial ice.

Methods. Determining the optimal design solution for microclimate systems in terms of several parameters, each of which can be decisive, is an applied task of system analysis, the basic principles and patterns of which were taken into account when solving the problem of multicriteria optimization.

Results. A list of particular optimality criteria reflecting the qualitative and quantitative characteristics of design solutions has been determined. The method of vector criterion convolution has been used to search for the optimal solution for the selected particular criteria. An optimization model based on the principles of system analysis has been developed.

Conclusion. The developed mathematical model of multicriteria optimization makes it possible to provide priority to more important particular criteria by increasing their weights. In this case, it should be remembered that particular criteria must be commensurate, and, therefore, reduced to a dimensionless form. Since the absolute values of the criteria are essential in the optimization task under consideration, for the chosen vector of parameters, it is necessary to choose exactly the additive method of folding the generalized criterion.

Purpose of research is to improve software support and identify regularities in the processes of short-term forecasting of power consumption of power supply companies based on complementary integration of data mining models, system dynamics and expert systems.

Methods. The principles of constructing predictive models of power consumption are given. A system analysis has been carried out and an ontological model of the subject area has been built, taking into account the technological and market environment. The classification of forecasting methods has been considered. The features of the information base for short-term forecasting, including data on actual power consumption and weather data, have been described. The requirements for software for making forecasts have been formulated. A block diagram of the system for forecasting power consumption of the market for the day ahead is built based on the complementary integration of data analysis and modeling software.

Results. Scenarios for data processing in Loginom have been developed using the Arimax and Neural Network (Regression) processors to build forecasts based on actual power consumption and taking into account meteorological factors. A system dynamics simulation model that allows exploring the influence of meteorological factors (temperature, pressure, precipitation) on power consumption has been developed in Anylogic. Using Wi!Mi mivar constructor of expert systems, the task has been parametrized; indicators, relationships, rules have been set; a logical conclusion of the solution has been obtained.

Conclusion. A block diagram of a system for forecasting the market's power consumption for the day ahead has been built. It is based on the analysis of retrospective information on actual power consumption and meteorological factors using data mining methods, system dynamics and expert systems applying Russian Loginom, Anylogic and Wi!Mi software tools.

Purpose of research. The study presented in this article is aimed at establishing and substantiating the principles of effective incorporation of intelligent elements of the control system of a mobile robot operating in a dynamic environment. The subject of the study was the procedure of simultaneous localization and mapping involved in the control. Indicators related to ensuring the information security of the process of robot functioning in real operating conditions were used as the performance criterion.

Methods. A methodology for the experimental study of the software procedure execution for simultaneous localization and mapping within the framework of the task of controlling a mobile robot has been developed and implemented. The main focus of the study is a computer model of an abstract mobile robot performing reconnaissance functions in a virtual dynamic environment. The incorporated elements of intelligent information processing into the procedure of simultaneous localization and mapping are convolutional and fully connected neural network layers that provide filtering of dynamic objects.

Results. When conducting this experimental study, a simulation of the process of functioning of a computer model of a reconnaissance mobile robot in a virtual environment has been performed. Similar experiments have been reproduced with various structural and functional configurations of the procedure for simultaneous localization and mapping. Quantitative results have been obtained, demonstrating the accuracy of positioning the subject of the study for each of the methods of organizing this procedure. A comparative analysis of the options for using the elements of intelligent information processing within this procedure has been carried out.

Conclusion. It has been established that incorporation of the elements of intelligent information processing into the procedure of simultaneous localization and mapping has an impact on the positioning accuracy of a mobile robot and the reliability of its functioning in a dynamic environment. This contributes to the compliance with information security standards when using mobile robots in real operating conditions. It is also determined that there is their excessive use, which leads to a deviation from the optimal qualities necessary for effective autonomous control of a mobile robot and information security provision.

Purpose of research. Is to increase the degree of automation of contractual relations legal support of the parties as in the case of publishing activities through the development of model-algorithmic control and software for the automated creation and updating of texts of publisher-author license agreements.

Methods. When analyzing the processes of automating legal activities in relation to the creation, development and updating texts of contracts, Russian and foreign technologies and software that allow automating the processes of contractual activities have been considered. Conceptual and set-theoretics models of the process of automated building texts of contracts have been proposed.

Results. An original classification of tasks and ways of automating the legal activities including a list of promising information technologies have been proposed. Conceptual and set-theoretics models of the process of automated building texts of contracts have been developed; they differ in the use of a set of public acts, information resources, and expert information available as sources of information to create the necessary document in the selected subject area based on the algorithm of data verification, generation, visualization, contract updating, which provide contract creation and updating in an automated mode. An algorithmic model for automated processing of contract parameters which differs in the distribution of tasks between experts (a lawyer, a programmer) and software tools at has been developed. The main stages of the document life cycle involve creating, updating, deleting a contract, which, based on the event model, checks for updates in public acts and automatically corrects the text values of the parameter of the contract. The proposed solutions have been tested in case of a license agreement between an author of the article and the publishing house issuing Informatics and Automation journal.

Conclusion. The development of model-algorithmic control and software for processing text information available from public acts, information resources provided by representatives of subject areas necessary for the automated generation, verification, and visualization of individual acts contributes to an increase in the degree of automation, reduces the time of preparation of legal documents that meet the requirements of existing public acts. Means of automating contractual activities should be built on the principle of openness, be dynamic, and also be externally controlled. The software services of the St. Petersburg Federal Research Center of the Russian Academy of Sciences for the automation of legal activities developed within the framework of this study are available at http://legaltech.viwo.ru/.

Purpose of research. Is to develop and implement an algorithm for trajectory control of an autonomous unmanned undersea cuttlefish-type bionic vehicle, designed for reconnaissance operations, combat security of surface and undersea naval armament.

Methods. The design and principle of operation of a cuttlefish-type bionic undersea robot are presented. The design  of a three-dimensional model of a cuttlefish-type robot for military intelligence has been carried out using the SolidWorks software package. A computational dynamic scheme has been considered and a mathematical model of the movement of an undersea amphibious robot implemented in the Mathcad package has been presented. The movement of the robot is provided by wave-like movements of the elastic side fins resting against the aquatic environment and forming tractive forces in the required direction. Using the methods of computer mathematical modelling, the adequacy of the developed mathematical model of the undersea robot has been proved and the algorithm for trajectory control of the movement of the object along a given trajectory at a required speed has been worked out.

Results. The system of automatic control of the trajectory movement has been considered for the case of the movement of the robot in a horizontal plane with further passage to a given linear trajectory and maintaining the required mode of longitudinal movement at a given speed. To do this, channels to control tractive forces created by the wave-like movements of the lateral fins have been formed according to the angular and orthogonal errors. The coefficients of the controllers have been selected to ensure the asymptotic stability of the system and the required quality of transient processes.

Conclusion. The developed and implemented algorithm for trajectory control of the movement of an undersea cuttlefish-type bionic robot from various initial positions along a given trajectory showed good adequacy and high effectiveness demonstrating stability and providing the required indicators of the quality of transient processes.

Purpose of research. Development of a methodology for determining deviations of pilotless aircrafts from a given trajectory in conditions of signals loss from navigation satellites.

Methods. The technique is based on functional relationship between deviation parameters of pilotless aircrafts from a given trajectory and changes in longitudinal and transverse parallaxes of overlapping images of the underlying surface due to these deviations. Mathematical description of computational procedures for deviation parameters determination used methods of functions approximation and mathematical processing of measurement results with accuracy estimation of obtained results.

Results. A methodology that includes monitoring, assessing the level and determining the magnitude and direction of deviations of pilotless aircrafts from a given trajectory was developed. A system of nonlinear equations describing functional relationship between deviation parameters and changes in parallax of overlapping images of the underlying surface is obtained. Linearization, normalization and solutions of this system of equations by the least squares method were performed. Analytical relations were obtained for a posterior accuracy assessment of the obtained results.

Conclusion. The technique provides parameters detection and determination of uncoordinated deviations of pilotless aircrafts from a given trajectory with an accuracy commensurate with satellite navigation methods. The proposed approach makes it possible to reduce the number of processed corresponding points in overlapping images and the dimension of the problem being solved in comparison with known methods. This significantly reduces the level of computational and resource costs, which is of great importance for the use of developed technique on the board of miniature pilotless aircrafts.

The purpose of the research is to develop the method for early diagnosis of real-time traffic loss with time-out control in software defined networks (SDN).

Methods. An overview and description of the transfer of heterogeneous traffic in an Ethernet switch with support for quality of service and Time-Triggered Ethernet technology is given. The functioning of the timeout control blocks for instantaneous removal of a frame from the hard timeout control system and depending on the length of the frame when the idle timeout receiving side is reached is described in detail. These control units are included in the hardware guard of control time-outs for real-time traffic. The work of the switch OpenFlow is described using guard of control time-outs. The formation of time windows of timeouts during frame transmission is described and developed.

Results. With the help of the proposed method of early diagnosis of real-time traffic losses with control of timeouts in SDN, a modeling of SDN based on Petri nets and using the CPN Tools modeling package was carried out. The obtained model and experimental results are consistent with the theoretical calculations and the proposed method of transmitting real-time traffic, taking into account its losses in SDN.

Conclusion. Using the model, the functional and temporal behavior of the model was investigated; the method was verified using Petri nets. The results were obtained in the form of time diagrams reflecting the work on traffic types in accordance with the proposed method.

Purpose of research. The purpose of this work is to increase the performance of question and response information systems in Russian. Scientific novelty of the work is to increase the performance for RuBERT model, which was trained to find the answer to the question in the text. As far as a more efficient language model allows more requests to be processed in the same time, the results of this work can be used in various information question and response systems for which response speed is important.

Methods. The present work uses methods of processing natural language, machine learning, reducing the size of artificial neural networks. The language model was configured and trained using Torch and Onnxruntime machine learning libraries. The original model and training dataset were taken from the Huggingface Library.

Results. As a result of the study, the performance of RuBERT language model was increased using methods to reduce the size of neural networks, such as distillation of knowledge and quantization, as well as by exporting the model to ONNX format and running it in ONNX runtime.

Conclusion. As a result, the model, to which knowledge distillation, quantization and ONNX optimization were simultaneously applied, received a performance increase of ~ 4.6 times (from 66.57 to 404.46 requests per minute), while the size of the model decreased ~ 13 times (from 676.29 MB to 51.66 MB). The downside of obtained performance was EM deterioration (from 61.3 to 56.87) and F-measure (from 81.66 to 76.97).