Objectives The aim of the study is to revise design and calculation methods for metal cutting tools due to an increase in their quality requirements. The design of metal cutting tools necessitatesfinding a solutionto a number of issues related to their calculation, construction, manufacture and operation. However, the methods for solving these issues have always been dependent on the means that the toolmaker had at his disposal.

Methods Contemporary electronic computers and digital equipment offersignificant opportunities for improving the process of machine tool design. To solve this problem, it is necessary to generate calculation methods that aresufficiently analytical to becapable of rigorously formalising the entire designing process. They have to support clearly defined optimisation criteria and be of sufficient generalityto enable all problems associated with tool designto be solved in a complex manner. That is, these calculation approaches have to support methodologies for solving the problems of the surface shaping by tools, calculating the cutting schemes, as well as the strength and manufacturability of the cutting part.

Results A flowchart of a calculation algorithm for designing and calculating the combined countersink-tap toolhas been developed, allowing the process of calculating its basic parameters to be automated according to a predefined programme.

 Conclusion The developed flowchart of the calculation algorithm with the preset programme allows the process of calculating the basic parameters of the combined countersink-tap tools, used for threading in the parts of ship machines, mechanisms and ship fittings from hard-to-process materials, to be automated. The flowchart can similarly be used to automate the process of calculating the parameters of any cutting tools used to process any materials.

Objectives The aims of the study are to expand the edge state method for solving bending and torsion problems concerning anisotropic thin plates, develop the theory of construction of the bases of spaces of interior and edge states based on a general approximate solution to the plate bending problem, formulate the relationships determining the desired elastic state and implement the developed theory in solving specific problems.

Methods The fulfilment of the tasks is assumed to be based on the edge state method. The state spaces comprising the methodological basis are formed according to the fundamental system of Weierstrass polynomials.

Results An isomorphism of interior and edge state spaces is demonstrated, allowing a correspondence between the elements of these spaces to be unambiguously established. The isomorphism of spaces allows the process of finding the internal state to be reduced to the study of the edge state isomorphic to it. The mechanical characteristics are represented in the form of a Fourier series. In the case of the first and second fundamental mechanics problems, the Fourier coefficients are represented by scalar products having an energy implication: in the space of edge states, this consists in the work of external forces; in the space of internal states, it is the internal energy of elastic deformation. In the case of mixed mechanical problems, the search for an elastic state in the terms of the edge state method is reduced to solving an infinite system of algebraic equations.

 Conclusion The solution of the first-tested basic problem of bending with torsion for a rectangular fibreglass plate with corresponding conclusions is given, as well as the problems of torsion for a plate of nontrivial form. Commentaryis provided concerning the unreasonableness of the solution of the second fundamental problem, as well as the problem with mixed boundary conditions for a rectangular plate where twisting and bending forces are defined simultaneously on the one face, while the opposite face is squeezed. Both explicit and indirect signs of the convergence of the solution to the problem are presented along with a graphical visualisation of the results.

 Objectives The aim of the study is to develop a methodology for identifyingaircraft by the deflections of an electromagnetic radar beam by a heated jet engine.

 Methods Atoms of the crystal lattice of the metallic parts of the operating jet engine will be in a state of chaotic Brownian motion due to heating. The electromagnetic beam, falling on these atoms, will change its frequency in accordance with the Doppler effect, by means of which the spectral electromagnetic radiation component will expand in direct proportion to the magnitude of the engine temperature. When determining the width of the spectral line of the direction-finding radio emission, it is possible to accurately identify the temperature of the aircraft in order to avoid false targets.

Results When locating aircraft having a working jet engine, it is possible not only to determine the coordinates of the target, but also to identify the heated engine. Due to the use of high-precision methods for identifying heated sections, the direction-finding targets may be classified, the spatial orientation of both the aircraft itself and its control planes to be determinedand the direction of the thrust vector control of the jet engine calculated.

Conclusion The application of an innovative technique for direction-finding air targets will allow the radar targets to be identified with high accuracy against the background of active and passive interferences. In addition, when analysing the information on the magnitude and direction of the jet engine thrust and the position of the aircraft controls, it is possible to determine not only the coordinates of the direction-finding object, but also to proactively identify the manoeuvres to be performed.

Objectives The aim of the study is to increase the energy efficiency of an arc furnace’s power supply system and low-voltage circuit. According to the aim of the research, the relevant tasks of determining the capacitor capacity for reactive power compensation and selecting a rational location for its installation are posed.

Methods Within the framework of the previously developed concept of changing the parameters of the switching transformer in the series compensation circuit, issues of efficient use and consumption of electrical energy by a high power linear load under sinusoidal mode are considered. The installation of static compensators using a direct compensation method with automatic control including 12 stages of regulation is proposed as a means of increasing the efficiency of the arc furnace. Challenges involved in increasing the efficiency of electric power supply to alternating current arc furnaces using compensating reactive power in a low-voltage circuit are considered.

Results The viability of using the series compensation circuit of reactive power with the switching of capacitors in the winding of the higher voltage of the series switching transformer is demonstrated.

Conclusion It is shown that for efficient use and consumption of electric energy by highpower linear load under sinusoidal conditions, it is advisable to apply the series compensation of reactive power with the switching of capacitors in the winding of the higher voltage of the series switching transformer. This makes it possible to increase the efficiency coefficient of electric arc furnace power supply devices by reducing the power losses in the power supply system and in the furnace lowvoltage circuit by 1.6 times, as well as reducing the total load in the power transformer by 1.36 times.

Objectives The aim of the study is to improve the performance of the metering system and thus enhance control over the cyclical supply of fuel to a diesel distributor pump. The results of a study of the effect of a new metering method on the characteristics of a distributor fuel pump are presented.

 Methods Following mathematical analysis, a mathematical model of the working process of the fuel supply system, based on a new metering approach employing the "decay of discontinuity" method, was compiled.The model comprises a system of differential equations for continuity and momentum alongside mass balance equations for describing the boundary conditions for various cavities of the fuel system, i.e. above the plunger, under the valve, above the valve cavities and in the nozzle. The differential equations take into account the two-phase nature of the gas-liquid medium in the injection cavities and metering system, as well as the design features of the pump. An expression for the stroke of the metering plunger in the new system is given.

 Results The theoretical and experimental characteristics of a fuel supply system employing the proposed metering system are considered. Diagrams showing maximum injection pressures, which depend on the stroke of the metering plunger at various strokes of the injection plunger and alteration of maximum injection pressure of the nozzle depending on the rotation speed of the cam shaft, are provided. The characteristics of the fuel supply system of the pump for various spring stiffness of the metering plunger are also provided in diagram form. The comparative parameters of the fuel supply process are presented for the conventional and new metering methods. The features of the use of diesel high-pressure distributor pumps, their design and operational features are described. The advantages of the metering system proposed by the author are presented in terms of its influence on the fuel injection process. A comparative evaluation of metering methods used in contemporary distributor pumps for diesel engines is given.

 Conclusion The results of the experiments confirmed the suitability of the new metering method for use in diesel engines.

Objectives The aim of the study is to consider the design of a device for the cautery of bleeding by the method of local freezing of the blood flow zone performed using a salt with a low cryohydrate dissolution temperature, as well as to model heat exchange processes when using this technique.

MethodA design for a device for cauterising bleeding using salts having a low dissolution temperature was developed. This ensures a high cooling intensity, shortening the time of formation of a thrombus stopping the blood flow. A model of the device was constructedaccording to the principlesgoverning the solidification of a viscous liquid and heat transfer associated with the dissolution of salts in water. The model was calculated using the finite difference method. A determination of haemostasis duration wasprovided by a numerical experiment.

ResultsPlots of the temperature dependence of the salt solution in water over time are obtained, reflecting the duration of the device's output to operating mode, as well as plots of duration of a 3 mm thick formation of solid phase blood against the temperature of the solution for different values of blood flow pressure in the wound area.

Conclusion On the basis of the numerical experiment, it was established that ammonium nitrate can be used as a working substance (salt) in the device. When it is dissolved in water, the minimum temperature of the solution is 256 K. The selection of the salt type and its quantity should be guided by medical norms and regulations in order to avoid the process of frostbite of the tissues adjacent to the bleeding zone. It was shown that the duration of blood solidification and the formation of a thrombus of the required thickness depend significantly on the pressure of the blood flow in the wound area, which must be taken into account when designing the device.

Objectives The aim of the study was to simulate the heat transfer in flat channel with turbulators, symmetrically located on its both sides, depending on the channel's geometric parameters and the coolant flow modes followed by the verification of the obtained calculated data by the existing experiment.

Methods The calculation was carried out on the basis of a theoretical method based on the solution of the Reynolds equations, closed with the help of the Menter shear stress transport model, by factored finite-volume method, as well as the energy equation on multiscale intersecting structured grids (Fast COmposite Mesh method, FCOM).

Results A theoretical mathematical calculation model for intensified heat exchange in turbulent flow for a flat channel with turbulators, symmetrically located on both sides, depending on the channel's geometric parameters and coolant flow modes was generated. The calculation results of the intensified heat exchange in flat channels with double turbulators, depending on the determining parameters, are in very good agreement with the existing experimental material and have an undeniable advantage over the latter, since the assumptions made in their derivation cover a much wider range of determining parameters than the limitations of the experiments (Pr = 0.7 ч 100; Re = 103ч 106; h / dЭ= 0.005 ч 0.2; t / h= 1 ч 200).

 ConclusionAccording to the calculation results based on the developed model, it is possible to optimise the heat exchange intensification in flat channels with double turbulators, as well as to control the process of heat exchange intensification. The comparative calculations of the intensified hydraulic resistance and heat exchange for flat channels with two-sided symmetrical flow turbulators with corresponding data for round channels with turbulators were carried out and analysed. From the point of view of heat exchange intensification, all other conditions being equal, the reduction of a flat channel with two-sided symmetrical turbulators with respect to a round tube with turbulators takes place because a smaller increase in heat exchange is achieved with a greater increase in hydraulic resistance. It was established by calculation that the relative hydraulic resistance ξП/ ξT for channels with turbulators is always higher than for smooth channels; however, the relative heat exchange NuП/ NuT for channels with turbulators can be higher than for smooth channels. Therefore, there is an enhanced redistribution of the temperature drop over the channel section with an intensified heat exchanger. The developed theoretical method based on the solution of the Reynolds equations by the factored finite-volume method, combined with the energy equation on multiscale intersecting structured grids and closed by means of the Menter shear stress transport model, makes it possible, with reasonable accuracy, to calculate heat exchange coefficients and hydraulic resistance in flat channels of practically any forms of double symmetrically located flow turbulators.

Objectives The aim of the study is to develop a mathematical model for determining the direction-finding error of an aerodrome automatic direction finder (ADF), depending on the position of the defective vibrator relative to the source of radio emission.

Methods To determine the direction-finding error depending on the mutual location of the defective ADF vibrator and direction finding towards the radio source, the method of Fourier series expansion of step-by-step sampling of the signal phases is used. The direction-finding error is defined as the difference in the sum of the first harmonics of the phase sample’s stepped envelope Fourier expansion of the fault-free and defective antenna systems.

Results In this work, a mathematical model is obtained for determining the direction-finding error of the aerodrome automatic direction finder (ADF), depending on the mutual position of the defective vibrator and direction finding towards the radio source. The graph of the alteration of the ADF direction finding error is obtained depending on the position of the defective vibrator and the direction finding towards the source of radio emission. It is shown that during ADF operating in the quasi-Doppler mode, the failure of the vibrators located along the direction finding towards the source of radio emission does not lead to an error in direction finding. Conversely, during ADF operating in the differential-phase mode, the failure of the vibrators located along the direction finding towards the source of radio emission leads to a maximum direction-finding error, reaching 3.75є.

Conclusion When an aerodrome automatic direction finder (ADF) operates in a quasi-Doppler mode, the failure of the vibrators located along the direction finding towards the source of radio emission does not lead to an error in direction finding and, conversely, when the ADF operates in differential phase mode, this results in a maximum direction-finding error of 3.75є.

Objectives The aim of the research is to develop the principle of storing data templates to take their temporal natureinto account, making it possible to reduce decision-making times.In order to describe and identify temporal patterns in fuzzy time series behaviour in real time, the task was set to develop a hybrid data structure that allows for a consideration of sequences of fuzzy values formed from clear observable data as well as a determination of the length of these sequences and possible uneven time intervals between the observations.

Methods The article discussesan approach to formalising the description of temporal cause-effect relationships between events occurring at the object location as well as that of its environment, based on a set of singly-connected lists of triplets. Each triplet contains a fuzzy linguistic variable, the duration of its observation and the permitted interval of observation of insignificant data.

Results An algorithm for detecting knowledge base patterns in real time was developed, taking into account the possibility of a time shift in observing long sequences of identical values of the observed value. The possibility of partial data overlapping corresponding to triplets of different patterns is taken into account. The proposed hybrid pattern makes it possible to accelerate the detection of temporal regularities in the data.

Conclusion Scientific results are presented by the developed structure for storing information on temporal regularities in data, based on a singly linked linear list, as well as an algorithm for finding regularities in observational data using a set of OLS-patterns. The advantage of this structure and algorithm in comparison with the known ways of storing and analysing temporal data is a reduction in the amount of memory necessary for storing templates in the knowledge base, as well as the possibility of applying OLS patterns for decisionmaking purposes.

Objectives The aim of the work is to use neural networks to detect characteristic ECG signals that determine heart rhythm abnormalities and detect the corresponding heart disease. One of the most important factors for the timely provision of medical care is the rapid and accurate obtaining of information about the patient's state of health. The timeliness of diagnosis is often the main factor determining the patient's prognosis. While the accuracy of cardiological diagnosis has significantly increased in recent years due to the wide application of both instrumental and laboratory research methods, the percentage of diagnostic errors in cardiology remains high. Electrocardiography (ECG) consists ina non-invasive process of interpreting the electrical activity of the heart, allowing the speed and regularity of the heartbeat to be assessed. These data are then used to determine any heart defects or pathologies. However, automatic ECG analysis remains a challenging theoretical and practical task.

MethodsA MATLAB 8.6 (R2015b) Neural Network Toolbox was used to simulate artificial neural networksduring the design. A backpropagation algorithm was used for trainingthe neural network. The efficiency of the developed neural network model for ECG analysis was investigated using the MIT-BIH arrhythmia database.

Results The accuracy of detection and extraction of the components of the ECG signal shows that the developed neural network model can be successfully used to detect heart diseases among patients. The sensitivity of the model was 71%, with a specificity of 89%. The elaboration of existing and development of new methods for processing electrocardiographic data allow the problem of timely diagnosis and prevention of cardiovascular diseases to be solvedat early stages of their detection.

ConclusionThe accuracy of detection and extraction of the ECG signal components shows that the developed neural network model can be used to detect heart diseases among patients.

Objectives The aim of the study is to increase the effectiveness of unmanned aerial vehicles (UAVs) in the context of destabilising meteorological factors on the basis of an identification of links and patterns of unmanned aerial vehicles operating in difficult weather conditions.

Methods In this work, in order to account for the effect of meteorological factors on the effectiveness of unmanned aerial vehicles, the methods of system analysis, mathematical modelling of atmospheric phenomena and processes, as well as probability theory and statistical assessment, were applied.

Result An analysis of open literature sources devoted to the issues of operation and practical application of unmanned aerial vehicles (UAVs) under the influence of environmental factors was carried out. A classification of destabilising influences (DI) affecting the performance of a UAV flight mission is developed and presented. The dynamic probabilistic indicator, which, in characterising the dynamics of UAV functions as a complex technical system is referred to as “time efficiency of the UAV flight mission”, is substantiated. A methodology for estimating the dynamic efficiency indicator of the UAV’s functionality during the performance of a flight mission (FM) underDI conditions is developed on the basisof a probabilistic model of the conflicting interaction between UAV and DI. Strategies for selecting the trajectories of flights around local zones in which UAVs can be influenced by DI are given. To estimate the DI intensity and determine the size of the local disturbance zone, a mathematical model is proposed, whose application makes it possible to improve the UAV functioning under complex meteorological conditions (CMC) by taking into account the information on the space-time variability of dangerous for UAV weather-related phenomena (DWP). In the process of constructing the UAV functioning model, the use of conflict theory methods permitted adequate models for the analysis and evaluation of the dynamic efficiency indicator of the UAV functioning during the performance of FM in DI conditions to be developed, as well as the patterns of meteorological factors influencing the effectiveness of the UAV application to be revealed.

Conclusion The methodology proposed in the article makes it possible to increase the effectiveness of unmanned aerial vehicles (UAVs) under complex meteorological conditions by a time index of 20-30% as compared with traditional approaches.

Objectives The aim of the study is to develop a mathematical model for the complex solution of various problems in designing and reconstructing the technological system of a production workshop of a machine-building enterprise.

Methods Complex system theory and an aggregative decomposition approach are used as the methodological basis for modelling complex hierarchical productions, making it possible to represent a complex system in the form of a set of interconnected subsystems.

Results A mathematical model designed for a complex solution of problems associated with the formation of an optimal production programme and selection ofequipment was developed. Operative parameters for processing machines according to a single optimisation criterion for the workshop were established. Distinctive features of the optimisation model proposed in the article are the possibility of its application both for design and for the reconstruction of a technological system, as well as the possibility of simple scaling to the required level (i.e. the workshop as a whole or a separate section).

Conclusion The article presents a complex mathematical model for optimising the technological system based on a single optimisation criterion for the workshop, combining the solution of the main tasks of design and reconstruction of the workshop. The use of a single integral optimisation criterion for several problems allows the strong interrelationships between individual tasks to be taken into account. The model is based on the principle of arranging a model from a set of typical elements, easing the construction of models for any sub-task combinations, as well as their respective options. It is possible to use the model’s multi-level unification and scalability to increase modelling efficiency and thus optimise complex multinomenclature productions.

Objectives Following logging operations, tree stumps remain in the site of the former forest.While these may be uprooted by special machines in the course of forestry operations, the use of heavy forestry machines operated repeatedly on the forest sites not only lead to soil erosion, but also to considerable financial expense. Consequently, the development of machines combining cutting (logging) and uprooting operations – that is, uprooting the trees along with their roots – are of a great interest. As research has shown, the main disadvantages of the use of such technology by “conventional” logging or forestry machines are their excessive loading and energy intensity. The aim of the research is to investigate means of eliminating these drawbacks by using vibration.

Methods The article deals with theproblem of ensuring the effectiveness of the vibration application – in particular, torsional vibrations, used to stub trees together with their roots. To solve this problem, a mathematical model of the “machine-tree-soil-root system” system was developed, which takes into account the mutual influence of the dynamic characteristics of the machine’s technological equipment and tree and soil-root system, which allows a rational (optimal) frequency range of vibration equipment to be selected by analysing the amplitude-frequency characteristics of a given system. To analyse the amplitude-frequency characteristics of a mechanical system, the Euler-Lagrange equationswere used.

Results Based on the mathematical model of the “machine-tree-soil-root system (SRS)” system and an analysis of the amplitude-frequency characteristics of a given system, a rational range of vibration frequencies was determined. As shown by analysis, the work of vibrational equipment in a given frequency range can significantly reduce the dynamic loading of the machine and at the same time create appropriate conditions for the effective destruction of the soil-root system.

Conclusion The proposed method allows the rational values of the frequency characteristic of vibration equipment for each calculated tree to be found depending on the soil type and the basic machine.

Objectives. The theory of intersubjective management, designed to manage social processes in society, is aimed at achieving mutual understanding and consensus among heterogeneous actors united in self-organized communities. Actors who are aware of themselves in a problem situation (rather than just viewing it from the outside) are motivated to solve it, and joint decisions are made by the entire community of actors who are forced to negotiate with each other, realizing that their own resources are not enough to solve the problem. The use of modern information and communication technologies could allow to increase the effectiveness of the decision-making process and reduce its time, providing actors with the means of interacting each other in the process of seeking likeminded people, negotiating and reaching consensus. Therefore, the aim of the research is to find means of infocommunication support for the theory of intersubjective management which help to organize the interaction of actors who found themselves in difficult problem situations in everyday life.

Method. The system approach, method of the comparative analysis are applied. For the purpose of better presentation the semantic mean of graphical visualization Free Mind is used.

Result. The analysis of modern infocommunication facilities, the most popular among potential actors, is carried out and their comparison is made. The evaluation of the capabilities of all the analyzed means from the point of view of their suitability to the needs of intersubjective management is given. The choice of the most suitable infocommunication facility for use in the company "TBM-Povolzhje" is made.

Conclusion. The analysis of infocommunication means allowed to present their wide spectrum for application in practice while using the theory of intersubjective management. The research was performed as part of the state budget theme "Intersubjective Management of Socio-technical Objects Innovative Development with the Use of Situations Ontological Models" (No. AAAA-A16-116040410061-0) of ICCS RAS.

Objectives The aim of the studyis to develop ways to increase the crack resistance and durability of prestressed wall panels made of cellular concrete.

Method A complex study was carried out at the stage of factory manufacturing of two-module, aerated concrete wall panels with prestressed rods of class A-III reinforcing steel, 10 mm in diameter, located in the middle of the panel in the longitudinal and transverse directions.

Results It was found that the total stress losses in straining rods prior to casting of the aerated concrete mix, connected with stress relaxation in the reinforce and with deformations of the headings of the straining rods in the gripping jaws, the steel mould deformations, as well as the losses after the panel exit from the autoclave during the transfer of force to the concrete, are 15-20% of the initial level. At the same time, depending on the dimensions of the straining rods, the length of the strain transfer zone was in the range of 150 to 250 mm. A study of the effect of pre-compression on the closure of possible technological cracks in concrete test panels showed that, due to biaxial compression of concrete, new cracks do not appear when they work on bending and stretching (during the decking and transportation). Moreover, initial cracks that sometimes can appear during the autoclave processing become closed.

Conclusion Comparative tests of prestressed and typical panels for short-term load in accordance with GOST 8829-94 requirements indicate a significant increase in their rigidity and crack resistance, as well as the shear strength of their bridge part. The design of straining reinforcing rods with the end transverse anchor in the form of a horseshoe, together with attached flat welded frameworks made of Vr-I wire with a diameter of 5 mm, which are installed along the contour of the window openings of the test panels, ensure its reliable adhesion to cellular concrete and effective anchoring in the panel's body until the end of its useful life. Biaxial prestressed reinforcement by single rods in combination with conventional frame reinforcement opens up possibilities for the production of external wall panels from non-autoclaved cellular concrete with ordinary heat treatment, instead of ceramsite concrete panels.

Objectives At present, the urgency of scientific research aimed at reducing the material consumption of building structures is growing. Since foam concrete proved to be an effective material for wall structures, the aim of the present work was to develop scientific ideas about features of their macrostructural formation at the “viscous to solid” phase transition.

Methods The evaluation of plastic strength was carried out according to the patent for invention No. 2316750 (“Method for determining the plastic strength of foam concrete mix” registered in the State Register of Inventions of the Russian Federation on February 10, 2008). Synthetic PO-3NP (TU 38-00-058079999-20-93) and "Arecom-4" galipot glue analogue (TU 31-10) were used as foam generation agents. Control over the kinetics of the plastic strength of the test mixtures of equal density was carried out in five-litre vessels at an interval of 15 minutes for three hours.

Results The paper considers the most important features of mass transfer, which control the formation of defectiveness for interporal partitions in foam concrete. From the analysis of theoretical and experimental data, it follows that the ratio between water and surfactant consumption is an important tool for managing the quality of foam concrete mixes. Definingthe optimal relationship between water consumption and the amount of foaming agent allows the maximum amount of surfactants to be located at the gas-liquid interface ensuring minimal defect in the structure of the interporal partitions in the cured concrete.

Conclusion The theoretical and experimental studies carried out make it possible to consider the relationship between the consumption of water and surfactant as an important tool for controlling the structural and mechanical properties in foam concrete mixes.

Objectives This article discusses the evaluation of the possibility of application of three-layer pipelines. For this purpose, the stress-strain state of three-layer pipes under the action of internal pressure is investigated. The largest in the modern world are considered to be the main pipewater. They are mainly used to transport oil and gas from production sites to processing plants. Pipelines are intended for movement of liquid, gases and other environments and first of all it is water pipelines. As you know, main and technological pipelines are IP-elite club that cares only metal buildings, the construction of which consume Xia millions of tons of steel. On the other hand, one of the main indicators of efficiency of trunk pipelines is their material consumption. As a rule, trunk pipelines have a long length, and therefore an unreasonable increase in the even thickness of the pipe walls by at least 1 mm leads to an overspending of steel by de-siyatki and even hundreds of thousands of tons. In this regard, to the calculations of the main pipe wires for strength should be given the most serious attention.

Methods The calculation is carried out by numerical methods, namely with the help of finite element meto-da (FEM), implemented in the PC "LIRA".

Results The calculation of the pipes is performed on the load from the transported medium applied to the inner contour of the pipe. In this case, for the three-layer pipe (the first option) and for the pipes of the second and third options, the ring tensile stresses and strains were determined. The isofields of tensile and shear stresses are given, the comparative graphical dependence of ring tensile stresses is constructed.

Conclusion. The obtained numerical results showed that the selected calculation scheme (var.1), that is, the representation of the continuous section of the pipe in the form of a three-layer, is correct. The discrepancies between the data obtained are related to the rotation of the section along the radius of the pipe. In General, the results of calculations showed the possibility of using a three-layer pipe wall for transportation of various media.

Acknowledgment. This work was supported by a grant from the President of the Russian Federation (MK-6112.2018.8)

Objectives The aim of the study is to assess the level of development of the urban planning environment in the urbanised areas of the Astrakhan region and to determine the priority areas of the construction complex on the basis of the data obtained.

Methods The evaluation of development indicators for the urban planning environment is based on the methods of economic-statistical and comparative analysis as well as the index method.

Results Based on the proposed methodology, a calculation of the development indices of the urban planning environment of the cities of the Astrakhan region is carried out. Priority directions of investment and development of urbanised territories are identified.

Conclusion The methodology for assessing urban planning development allows the activities of the construction complex to be targeted towards an improvement of the urban planning environment. The article presents the results of assessing the development level of the urban planning environment in the urbanised areas of the Astrakhan region. Based on this assessment, priority directions of the construction complex activities are determined and some results of interregional research are presented.

Objectives The aim of the study is to apply a systemic approach to the development of organisational forms and management methods of participants of the investment process in the construction industry.

Methods The research method was based on theoretical study, analytical generalisation and systematisation of normative and legislative bases, conceptual provisions and established practice of organising the interaction of participants in the investment process in construction. Systemic and situational approaches, statistical analysis and the method of graphic images were used in the research.

Results The current legislative support of investment activity in construction was analytically generalised. The contemporary forms of organisational-economic interaction between the main participants in the sphere of investment relations in construction were investigated and features of their inclusion in the investment process were disclosed. A development form for the mechanism is proposed that allows the interests of all participants of the investment process in construction to be realised without harming the customer, contractor or investor, resulting in a synergetic effect. The functional role of the state in maintaining control over the implementation of investment projects in construction is stipulated. Effective forms and methods of implementing the organisational and economic mechanism for interaction between participants of the investment process in construction are disclosed, providing solutions to key issues in the investment and construction sectors, focused on the development and promotion of alternative options for investment and project solutions, the management of corporate resources and the organisation of financing investments in construction.

Conclusion The systemic approach to the management of participants of the investment process in construction will make it possible to realise the needs of the investment-construction complex in highly effective forms of organisation and methods for implementing the investment projects. To overcome existing contradictions, characteristic for investment processes, it is necessary to develop and implement incentive measures that unite the interests of all participants in the construction process.

Objectives The aim of the study is to identify the development directions for industrial production in the regions of the Russian Federation under the conditions of ongoing sanction pressure.

Methods Systemic and situational approaches, as well as the modelling of economic processes and phenomena, are used as research methods. The graphic images method is used in order to visualise the analytical data and the results.

Results The development features of industrial production in the country's regions are examined; in particular, those of the Volga Federal District and the Perm Krai. Generally positive trends associated with production volumes – as well as a slight decrease in prices and production volumes in metallurgy caused by sanctions and unfavourable external market conditions – are revealed. Due to increased demand for certain types of products,Metallurgical production in Russia is developing in different directions;however, as a consequence of restrictions imposed on some of them, there is a need to develop compensatory mechanisms based on state regulation of pricing and salespolicies. Despite the sanctions, export of the products of the industry under review is increasing;nevertheless, the stability of exporting enterprises is affected by volatility in world prices. The relevance of state complex support measures is substantiated; these consist in the formation of an anti-crisis management mechanism based on approaches that have been proven in industries experiencing problems of the world market situation.

Conclusion Taking into account the performed analysis, an anti-crisis management mechanism in the metallurgical sector, which can be adapted to the regional and branch features of operating industrial enterprises, was proposed.