Objectives. The development of a mathematical dynamic system model is necessary for analysing vibrational motion during the metal  cutting processes. The mathematical model of the dynamic system is considered to be defined if the system parameters that  unambiguously determine its state are known and the alteration of  its state over time is specified. Considering the above mentioned, each study of vibrational motion must be preceded by a  determination of the parameters of the oscillator circuits of the  mathematical model. The working part of the metal cutting tool  consists in a shank having a complex profile, which makes such  calculations very difficult to carry out. There are no sufficiently rigorous and, at the same time, acceptable formulae for  engineering practice in the literature data. Therefore, data on the  characteristics of the metal cutting tool – in particular, its stiffness  and moment of inertia – scatter significantly. The aim of the study is to obtain calculated dependences that meet these requirements and  determine the limits of their applicability for different cutting tool  diameter ranges.

Methods. Approaches referring to the theory of elasticity are used for the calculations.

Results. Engineering formulae for the calculation of stiffness and  polar moment of inertia of the metal cutting tool are obtained; in  particular, three- and four-blade taps with straight flutes as well as  drills. It is established that to increase the dynamic stability of the  metal cutting tool, it is necessary to increase the moment of inertia  of the section. This can be achieved by increasing the diameter of  the core.As the flute helix angle increases, the stiffness of the tool  decreases significantly. High stiffness of the metal cutting tool can be achieved by employing a flute with a variable helix angle. 

Conclusion. The calculated dependences allow the parameters of  the Machine-Device-Tool-Part (MDTP) system to be set with an  acceptable accuracy when analysing metal processing dynamics  using metal cutting tools. The influence of the sharpening angles on  the moment of inertia is demonstrated; the account given for the  latter will significantly increase the reliability of the results of the  analysis of the process dynamics.

Objectives. During the design of different types of devices it is important to obtain reliable information concerning both the pressure distribution along the device's walls and the pressure at the level of  the eduction gear. Differential equations for the equilibrium and  stationary states of the loose medium accounting for the forces of  dry friction between its particles are provided in the article.

Methods. Both the vertical pressure component z P and its gradient along axis OZ are assumed to depend on the respective radius.  Consequently, different forces will act vertically on the neighbouring  elementary rings. This leads to the neighbouring outer ring being  shifted downwards relative to the one under consideration;  conversely the neighbouring inner ring, relative to the latter, will be  shifted upwards. Therefore, the forces of dry friction acting on the  inner and outer lateral surfaces of the elementary ring under consideration will be directed in opposite directions. The resultant force will be determined by the gradient of the pressure  component along the coordinate  P . The assumption that the  components of the pressure acting on the loose material depend on  the coordinates leads to the need to take this force into account.

Results. The resulting differential equations are integrated by  successive approximation in the boundary conditions corresponding  to an extended track hopper; the derived analytical expressions for  the pressure components of loose material in the hopper are  illustrated with the help of graphs for the actual parameters of the  hoppers; the distribution of loose material pressure along the walls  of track hoppers is analysed on the basis of loose material concepts  as an easily deformed anisotropic medium, which differs in its  properties from a liquid and does not obey Pascal's law.

Conclusion. The walls of the hopper take on all the load. To save the wall's material, its thickness can be considered not as a  constant, but rather as a variable, providing maximum strength at a  level of 2/3rds of the height at which vibrators are to be positioned  to ensure a continuous flow of loose material from the hopper.

Objectives. The aim of the research is to find ways to use cavitation effects in the creation of new technologies and means of applying  unique opportunities arising under conditions of developed bubble  cavitation. Erosive destruction of concrete caused by a submerged  cavitation jet is experimentally investigated in the present work in  order to reveal the regularities of the extent of damage under different flow regimes.

Methods. The tests were carried out using an specially constructed experimental bench, containing a receiving tank from  which water was supplied to the plunger pump with an electric motor and pumped through a high-pressure hose into the cavitator. The  criteria for assessing the intensity of cavitation impact were the  dependence of the erosion zone depth on the test time and the relative distance to the cavitator's cut-off ε for different values of the inlet pressure Po.

Results. Experimental dependences and the analytical function of erosion penetration rate over time, as well as the relative distance  between the sample and the cavitator's cut-off, obtained using the  regression analysis method, are presented. For the selected  parameters of jet flow, the optimum distance from the surface to be destroyed to the cavitator lies across the range of (10-40) ε and reaches maximum effect across the pressure interval of 2.5-12.5  MPa on the average for 30 seconds. The relationship between the  depth and the erosion penetration rate for given pressure  parameters P0, the back pressure Pto, the distance from the  cavitator's cut-off to the surface, as well as the cavitator's diameter, correspond to the maximum erosive effect of cavitation.

Conclusion. The study of cavitation erosion opens up wide  possibilities for estimating the service life of hydrotechnical facilities  under the active influence of submerged cavitation jets. By varying  the parameters of jet flow, it is possible to obtain a different  intensity of erosive destruction of material for the application of this  phenomenon in the purification and crushing of concrete.

Objectives. The aim of the study is to assess the appropriateness of utilising combustible gases associated with geothermal water with  low gas factor and the possibility of its practical implementation with  the provision of power equipment operation of geothermal systems  with a nonscaling mode.

Methods. The investigations were carried out by analysing the content of associated combustible gases in the underground  thermomineral waters of the Cis-Caucasian deposits on the basis of  an assessment of the feasibility of their utilisation for heating and  hot water supply.

Results. A review of practically existing heat and power schemes  utilising geothermal water sources is carried out. Based on the  studies conducted, it is found that methane (70-90%) is prevalent in the water under consideration; meanwhile, the content of heavy hydrocarbons does not exceed 10%. The concentration of carbon  dioxide is 3 ÷ 6%, nitrogen 1 ÷ 4%. Depending on the depth of the  aquifer, gas factors range from 1 to 5 m3/ m3. As a result of the  analysis of the operation of typical thermal distribution stations, it is  established that a violation of the carbon dioxide equilibrium in water leads to the formation of a solid phase of calcium carbonate on the  heat exchange surface. A technique for estimating the relationship between the partial pressure of methane and carbon dioxide with the total pressure in a solution of geothermal water is proposed. A  scheme for the efficient operation of thermal distribution stations  with the prevention of carbonate deposits formation by using the  combustion products of the used gas combined with the injection of waste water back into the aquifer is presented.

Conclusion. As a result of the conducted studies, the possibility of  using associated combustible gases in geothermal wells is  established using differences in their solubility and that of carbon  dioxide. In this case, the protection of heat exchange equipment and the well from solid deposits of calcium carbonate can be achieved by  using combustion products of associated combustible gases.

Objectives. The aim of the research is to develop a thin-film semiconductor thermoelectric heat pump of cylindrical shape for the desalination of sea water.

Methods. To improve the efficiency of the desalination device, a  special thin-film semiconductor thermoelectric heat pump of  cylindrical shape is developed. The construction of the thin-film  semiconductor thermoelectric heat pump allows the flow rates of  incoming sea water and outflowing fresh water and brine to be  equalised by changing the geometric dimensions of the desalinator.  The cross-sectional area of the pipeline for incoming sea water is equal to the total area of outflowing fresh water and brine.

Results. The use of thin-film semiconductor p- and n-type branches  in a thermo-module reduces their electrical resistance virtually to  zero and completely eliminates Joule's parasitic heat release. The  Peltier thermoelectric effect on heating and cooling is completely  preserved, bringing the efficiency of the heat pump to almost 100%, improving the energy-saving characteristics of the  desalinator as a whole. To further increase the efficiency of the  proposed desalinator, thermoelectric modules with radiation can be  used as thermoelectric devices.

Conclusion. As a consequence of the creation of conditions of high rarefaction under which water will be converted to steam, which, at  20° C, is cold (as is the condensed distilled water), energy costs can  be reduced. In this case, the energy for heating and cooling is not  wasted; moreover, sterilisation is also achieved using the ultraviolet  radiation used in the thermoelectric devices, which, on the one hand, generate electromagnetic ultraviolet radiation, and, on the other, cooling. Such devices operate in optimal mode without heat  release. The desalination device can be used to produce fresh water and concentrated solutions from any aqueous solutions, including wastewater from industrial enterprises. The construction materials of the desalination device are environmentally friendly.

Objectives. The aim is to justify the expediency of a transition en masse to independent connection of heat consumption systems  under the conditions of pulse circulation of the coolant through the  equipment of a heat supply unit in order to increase the overall  energy efficiency of district heat supply systems.

Methods. The research is based on methodologies for the effective use of technologies providing a means of effecting a pulsed motion  of the coolant in the heat supply system. The advantages and  disadvantages of known technical solutions are identified and  summarised. Hydraulic accumulators or any other devices for  damping a hydraulic shock can be used as devices for preventing the propagation of a wave of hydraulic shock into the transport mainline.

Results. An analysis of approaches to heat consumption system  connection is carried out in order to assess power efficiency; the  most effective ways for improving the efficiency of heat and power  devices are identified; a synthesis of the technical solution for the  implementation of a technological connection of heat consumption  systems is performed. The expediency of transition to independent  connection of heat consumption systems under the conditions of  pulse circulation of coolant in heat supply units is demonstrated. The independent scheme of connection of subscribers to the heat network is indicated as the most appropriate. The factors  constraining the en masse transition to independent connection of the heat load are determined. Based on the analysis and scientific  research in the field of increasing the energy efficiency of heat and  power systems, the transition to pulse circulation of the coolant in  the heat supply unit of the independent heat consumption system is  selected. The presented technical solutions are confirmed by Russian Federation patents of inventions and utility models.

Conclusion. It is shown that the use of pulse coolant circulation in  the equipment of heat supply units for independent connection of  heat consumption systems will increase the reliability and long-term  operation of the recuperative heat exchanger, as well as increase the overall energy efficiency of the heat supply system.

Objectives. The aim of the study is to conduct an analysis of thermophysical processes in a thermoelectric system used for  providing the thermal regime of electronic equipment located in a cabinet. A cabinet design and thermoelectric system for efficient  heat removal from the condensing part of the heat pipe are  proposed. An additional advantage of the proposed design is the  obviation of significant additional power consumption requirement  for regulating the temperature of radio electronic equipment stored  in the cabinet.A distinctive feature of the constructive realisation is  the presence of an intermediate heat removal.

Methods. The three-dimensionality of the problem and mixed boundary conditions lead to the need to develop a calculation  of heat transfer in the elements of the construction of the  thermoelectric system. The numerical calculation method is based on the method of energy balances. The analysis of the heat regimes of  the intermediate heat removal is performed on the basis of a mathematical model for a locally-heated and -cooled restricted plate.

Results. A cabinet design and a thermoelectric system for efficient  heat removal from the condensing part of the heat pipe are  proposed. A distinctive feature of the constructive realisation is the  presence of an intermediate heat removal.

Conclusion.The capacity of the intermediate heat removal for given dimensions and temperature of the source is weakly affected by its  thickness (in constructively reasonable limits), as well as the  temperature and area of the absorbing side of the thermoelectric  module; the total heat output from the heat source is determined by the dimensions and heat exchange conditions on the free surface of the intermediate heat removal, as well as by the temperature and dimensions of the heat absorbing side of the thermoelectric module. The use of an intermediate heat removal can significantly reduce the thermal load on the thermoelectric module with a slight decrease in the temperature driving force.

Objectives. The movement of a ship in shallow water at both constant and variable depths of a navigation area is considered in  the article. With the deterioration of the navigation conditions, the  ship's handling is reduced; this is explained in terms of the influence  of disturbing factors, among which shallow water has the strongest  impact. Based on the analysis of existing mathematical models of  ship movement in deep and shallow water – and taking into account  their shortcomings – the task is to develop a mathematical model of  ship movement in shallow water at a constant and variable navigation area depth, as well as its implementation in software.

Methods. One way to improve the accuracy of a manoeuvre is to  obtain a mathematical model, taking into account the analytical  dependencies of the shallow water effect on the hydrodynamic  coefficients on the hydrodynamic equations of the ship, defined as a function of the ratio of the ship draft to the depth of the water area.

Results. Mathematical models of ship movement in shallow water at variable navigation depths, which differ from the existing ones, are developed: the coefficients of variable hydrodynamic equations are not constant values, but variables obtained by approximating the shallow water impact curves onto hydrodynamic coefficients in the form of third-order polynomials.

Conclusions. The developed mathematical models and their implementation present a number of advantages, which consist in the conducted studies contribution to the development of a new approach in modelling ship movements in shallow water when operating at variable navigation area depths, as well as when simulating ship movements in shallow waters at variable navigation area depth according to a given curvilinear trajectory. The software implementation of mathematical models and algorithms for ship movement in shallow waters with variable depth of the navigation area can be used for further studies on the dynamic characteristics of ships in shallow waters having variable depths, as well as for the analysis and assessment of skipper-induced accidents in maritime transport.

Objectives. The substantiation of the need and disclosure of the substantive and technological features of the design and  development of an information system for the registration of numeric parts and units at a manufacturing enterprise.

Methods. Case-technology,object-oriented programming.

Results. The development mechanism of an information system for registering numeric parts and units at a manufacturing enterprise is  described. The development process begins with an analysis of the  subject area, wherein the requirements for the information system  are defined. Two business processes related to the activity of the  production preparation engineer are identified and the entities and  types of these attributes are indicated. Using the case-tool  DBdesigner 4, a data scheme is constructed and code is generated for scripts used to create a database in the SQL language. The database is implemented on MySQL. The web-interface of the  information system is designed: website scheme, action sequence  diagram, website logical structure and layout. The resulting data  scheme is implemented within MySQL data base management  system (DBMS) and a web-based system interface developed using  object-oriented programming using Notepad ++ text editor. The  web-interface allows a multi-user working mode to be provided with the information system. The separation of basic and summary data among different tabs is performed in order to simplify the work of personnel and minimise the human factor associated with the processing of disparate data. The requirements to be met by the developed information system are defined.All software used in the development process is free.

Conclusion. The selection of software tools for the development of a system for accounting of numeric parts and units at a manufacturing enterprise is implemented, allowing the conceptual, logical and physical design of a database – as well as its web  interface – to be developed. All stages for creating an information system were realised.

Objectives. The article is devoted to the development of a method for designing analogue filters, including active, which differs from  known methods due to the fundamentally different approach taken to the selection of optimisation criteria.

Methods. Most contemporary methods, as a rule, calculate the  parameters of filter forming electronic components based solely on  the required values of the transfer function polynomial coefficients.  At the same time, the maintenance of the required stability and  reproducibility of filter characteristics is achieved primarily by  technological methods; for example, by using precision elements.  Nevertheless, it is possible to achieve a similar effect in a different  way, namely, by appropriate choice of the circuit component  parameter values. This approach is possible by selecting the individual circuit component values in an arbitrary manner, while the  necessary transfer function polynomial coefficients are obtained by  selecting the values of the remaining elements. Thus, having solved  the optimisation task, it is possible to achieve optimal design results in accordance with the chosen quality criterion.

Results. In this paper, the ε-layer model is proposed as the basis for this criterion, according to which either the deviations of the transfer function or the signal passed through the filter should be  minimally different from the given type and be located within the  given layer, either in the entire domain of the function or signal  definition, or in the most significant defined range.

Conclusion. The software package for the calculation of active filters is developed according to the proposed approach. The  productivity of its application is confirmed by experimental studies and the calculations performed using this application.

Objectives. The aim of the study is to analyse the effect of the design and methods for heating the ventilation duct of a buoyancy- driven system on the formation of free convective air currents in it.

Methods. The study of free convection under the conditions of interior problem was carried out using the CFD software, based on  the finite volume method with unstructured grid. Ansys Fluent software was used as a calculation tool in the study, due to its having a high convergence of numerical solutions offering full-scale  measurements of convective currents.To evaluate the reliability of  the results obtained, a validation procedure was carried out, allowing us to determine how accurately the selected conceptual model describes the investigated flow through a comparison of experimental and numerical data.

Results. The results of numerical modelling of free convective currents occurring in the heated channel of the ventilation system of  the top floor of a multi-storey residential building are presented in  the article. In the course of the study, the air velocity at the entrance to the ventilation duct was found to depend on the calculated  temperature difference θ ˚C for various heating methods. A gradual  increase in the discrepancy between the numerical simulation and  experimental results is observed if the calculated temperature  difference > 20 ° C. This phenomenon is due to the fact that with  increased duct temperature, it is quite difficult to achieve even  heating under actual conditions; this is especially noticeable when  considering the variant when the vertical part of the vent duct and the take-off are both heated. The maximum deviation of the  results is 4.4%. The obtained velocity profiles in the calculated  sections indicate the impact of the ventilation take-off on the nature  of the air flow motion.

Conclusion. One of the drawbacks of the existing systems of natural ventilation of residential buildings is the low efficiency of work in the  warm and transitional periods of the year, especially in bathrooms.  The use of buoyancy-driven ventilation with vertical heating of the  vent duct combined with the take-off allows a stable air exchange in the rooms to be provided.

Objectives. The optimal granulometric composition of filler compound ensures the production of concrete having improved  physical and mechanical characteristics, as well as minimal binder  consumption. The properties of heat-resistant concrete largely  depend on the type and the ratio of its components. Taking this into  account, the aim of the study is to determine the optimal grain composition of heat-resistant concrete.

Methods. Methods for optimising the properties of heatresistant basaltic concrete with a composite binder and  mechanochemical activation of the filler grains were used during the  course of the research.A simplex-centroid experiment design is  applied for this purpose. The composite binder was subjected to  mechanochemical activation. Samples were made by vibration-pressing from a concrete mix with a cone draught of 2 cm.

Results. The grain composition of heat-resistant concrete is proved  to be the most important variable factor, regulating which the  properties of concrete can be varied. The compositions of heat- resistant basaltic concrete with activated composite binder having a  maximum application temperature of 700 ºС are developed. The  influence of the grain composition of the basaltic filler on the  properties of basaltic concrete using mathematical experiment planning methods is determined. The regression equations for the ultimate tensile strength and bending stress of basaltic concrete are  obtained for heating temperature of 700ºC.

Conclusion. The granulometric composition of heat-resistant basaltic concrete based on the activated binder is optimised for basic physical and technical properties. The optimal granulometric  design of the composition of heat-resistant concrete indicates that as the coarse fraction (particles greater than 0.63 mm) in the filler  composition increases, the ultimate tensile strength and bending  stress of heatresistant basaltic concrete is increased when heated to  a temperature of 700ºС. This is due to a more compact arrangement of sand grains.

Objectives The aim of the study is to refine the calculation of wooden constructions, in particular, to use variable elastic modulus  for the calculation of the second group of the limiting state in order to predict the deformations more accurately.

Methods The study is carried out using the method of creep  consideration based on the use of either variable elastic modulus or  the “modulus of total deformations” for the calculations. These  moduli, besides the elastic, account for residual deformations, while  the fraction of the latter increases with increasing stress levels in the wooden elements.

Results The calculation of statically indeterminate spatial timber-metallic lenticular block-truss loaded with a uniformly distributed  load is carried out. At the first stage, the construction was calculated using the elastic modulus of all wooden elements E =  10000 MPa in accordance with the set of rules (SP 64.13330.2011  (updated version of SNiP II-25-80). At the second stage, the elastic  modulus was replaced by variable, i.e., matched to the level of  stresses in the elements by means of interpolation. The obtained  deflection values are analysed and compared to the construction  limiting value. The study was conducted without taking into account the flexibility of node connections and defects of the wood, which  can also have a significant effect on the deflection value.

Conclusion The use of a variable elastic modulus for calculations  significantly influences the magnitude of deformations (in our case,  deflections are increased by 30%). The study confirms the need to  take into account the creep of wood and refine the calculations of  wooden structures. Such approximating dependence at different moisture levels of wood will allow the calculation of wooden  structures to be performed at a higher theoretical level.

Objectives. The aim of the study isto assess the influence of concrete deformation properties during the restoration and (or)  reinforcement of reinforced-concrete sections using repair compounds.

Methods. In the study, a method of calculation of the load-carrying capacity of concrete sections is used according to a non-linear  deformation model using diagrams of concrete deformation, taking  into account the influence of the confinement effect and prescription  factors on the deformation properties of concrete. Deformation  diagrams are constructed for short-term loading of concrete of various classes, taking into account the possible change in its  deformation properties due to its structural features (e.g. fine- grained) and the presence of modifying additives (repair concrete) in its the composition.

Results. The increase in the load-bearing capacity of a section with its total area unchanged is not directly proportional to the area of  the reinforced concrete. The increase in the loadbearing capacity of  the section is not directly proportional to the increase in the class of  concrete reinforcement. Increasing the confinement coefficient from  1.3 to 1.5 provides an increase in the loadbearing capacity of the section from 15.5% to 58%. An increase in the elastic modulus of repair concrete by 1.5 times leads to an increase in the load-bearing  capacity of the section from 19% to 50%. While keeping sectional  value and reinforcement factor constant, the use of repair concrete  makes it possible to increase the bearing capacity of the section under consideration from 1.07 to 2.25.

Conclusion. The calculation of the strength of reinforced concrete  elements reinforced with repair compounds according to the  nonlinear deformation model allows the stress-strain state (SSS) –  and, consequently, the bearing capacity after the reinforcement – to  be estimated more accurately, while the choice of the repair  compound depends on the deformation properties of the “old”  concrete.

Objectives. The infrastructural aspects of integrated interaction and factors impacting on the efficiency increase of regional participation  in the creation of added value chains on the example of cooperation  between developed and developing countries during the  implementation of joint production projects are considered.

Methods. A factor analysis of the degree of various countries’ involvement into global added value chains is carried out,  taking into account their geographical location, natural resources and openness of markets, as well as the infrastructure, professional knowledge of the workforce, practice of cooperation of  domestic firms with foreign partners and the attractiveness of their investment climate.

Results. An evaluation of the integrated potential of individual countries, which could undertake the functions of  integrators and mediators within the implementation of regional  programmes of social and economic development, is presented. The  growth potential is estimated and the role of global creation chains  of added value (AVC) revealed as a tool for increasing the  competitiveness of national trade policies. It is determined that,  when adopting the latest technologies, companies strive to geographically approximate the placement of the middle links of added value chains to specialised suppliers, “smart” consumers and scientific centres as a means of maintaining innovation continuity.

Conclusion. The countries of the EEU and the CIS have significant potential for developing cooperation in the field of  transition to a model of new economic growth, as well as in the  development and application of regional added value chains. As well  as the extractive sector of the economy of the EEU and CIS  countries, included in the regional added value chains, agriculture, chemical and textile industries, metallurgy, transport  engineering, and services sector have the potential to be key industries.

Objectives. The aim of the study is to develop the characteristics of the institutional environment to ensure the sustainable development of regions.

Methods. Research methods comprise the system analysis, socio- economic modelling and forecasting. The method of graphic images  is used in order to visualise the analytical data and the results.

Results. The relevance of sustainable regional development in the  current economic conditions is substantiated, the necessity of a  complex approach of economic, social and ecological criteria for the  implementation of programmes aimed at transforming the social and economic space of territories, small towns, and municipalities is identified. The role of institutions in the development of territories is revealed and their mechanisms and classifications examined.  Different scientific approaches to the role and significance of the  institutional environment are characterised alongside a discussion of  the need for modernisation and adaptation to present economic conditions. An analysis of the socio-economic  characteristics of the institutional environment is carried out and the  directions for their formation up to a level corresponding to the  development strategy of the territory, small town or municipality are determined. The indicators of the development of the institutional  environment of small towns are characterised on the example of  three subjects of the Russian Federation: Perm Krai, Tula and  Vladimir oblast. Data on three types of institutions – constitutional,  economic and social – are considered together with living standards.  The composition of the institutions of the business environment,  education, culture and sport is analysed. The data on budget  indicators of small towns of the federal subjects under consideration  are reflected and problems concerning local budget deficits in the majority of municipalities are identified.

Conclusion. Based on the identified directions and criteria for the  development of the institutional environment, the directions for modelling the sustainable development of territories are developed.

Objectives To solve one of the complex and relevant problems of the modern economic science by optimising the management of  development and evaluation of the efficiency of production processes in construction organisations. The aim of the work is to develop the  effective management of organisational and economic aspects of the production potential of a construction organisation in an unstable economic environment.

Methods. As a methodological basis for the study, principles of situational management of complex socio-economic systems and  means of calculating the efficiency of production potential loading of  construction organisation are employed on the basis of the ratio of  production activity financial results to the costs of input factors introduced into the production process.

Results. The necessity for managing the production potential of the construction organisation and its goals are substantiated. The rules  are systematised, allowing organisational-economic and  organisational- technical management measures to be promptly  identified on a situational basis, these being the most effective in the current economic situation SE to eliminate the differences between  the situations ST and SC. The set of such inference rules for each element of the production potential of the construction organisation  ai, i = 1,2, ..., 5 will determine the situational model for managing  the production potential of the construction organisation in various  situations SjE, the economic environment for which the actual or  desired model of the state of its production potential form a  reference. Methods for balancing production factors introduced into  the production process and estimating the efficiency of loading the  production potential elements in production processes are proposed.

Conclusion. The proposed technology of situational management of  targeted development of various production potential elements,  based on the accumulated advanced experience of effective  management of production activities, provides a means for managing the effective functioning of construction organisations. The
proposed methods for managing and evaluating the efficiency of the productive potential usage make it possible to increase the efficiency of development and production activity of a construction  organisation under the changing conditions of the contemporary market.

Objectives. Relevant problems related to the adoption of unprogrammed solutions in the process of managing the production  activity of a construction enterprise in unstable, a priori  underdetermined economic environments are addressed.The aim of  the study is todevelop tools and methods for assessing the  effectiveness of the current state of construction production and on  this basis to identify the most effective management of a  construction organisation under unstable market conditions.

Methods. The methodology of the conducted research is based on the application of the mathematical apparatus of fuzzy sets for the  processing of expert data and the formation on this basis of linguistic functions that determine the analytical relationship between various  indicators of the production activity of the construction organisation.

Results. A method is developed for processing expert data using  fuzzy logic, making it possible to form an analytical relationship  between the performance indicators of the production activity of the  construction organisation and the management parameters that  determine its current state. An alternative means for selecting the  most effective management approach, accounting for its influence on the efficiency of the production activity of the construction organisation, is developed.

Conclusion. An information-economic model of situational management of the development of a construction organisation is  developed. The proposed tools and methods allow the effective  management of the production activity of the construction  organisation to be organised, and on this basis to increase the  efficiency of production under different economic conditions in the presence of spontaneously arising perturbative factors. The methodical approach to the organisation of management of the  production activity efficiency of the construction organisation allows the effective subsystems of management of other activities of  the construction organisation concerning the rejection and  indignation in the unstable conditions of the modern market  environment to be formed without fundamental changes in the organisational structure.

Objectives. The development of an algorithm for optimising the formation and use of human resources of a construction enterprise.

Methods. The research basis consists in a generalised methodology  for personnel management, as well as specific methods for logical  and statistical analysis of management decision-making in  construction activities. The approaches, criteria, indicators and methods for assessing the effectiveness of human resource  management are studied alongside factors influencing the efficiency  resource potential management in a construction enterprise.

Results. A quantitative methodology for the selection of qualified  staff for the implementation of construction projects is proposed.  The indicators of the effectiveness of the staff potential are  determined. Qualitative and quantitative data for the optimal  personnel formation for the construction project realisation are  systematised. An algorithm for optimising the personnel potential of  a construction enterprise is proposed. The use of this algorithm will  inform the choice of organisational and economic solutions for the  formation and effective use of qualified personnel at the expense of  combining professions, thereby reducing the cost and duration of construction work and increasing the resource efficiency and competitiveness of the construction enterprise.

Conclusion. The labour potential of a construction enterprise can  significantly contribute to increased efficiency if it is used  appropriately and in an organised manner, using modern scientific  methods of management. Methods for building and organising the  activity of the personnel management system are proposed and a  mechanism for establishing relationships between the employer and employees that promote the most effective use of all types of resources for the development of the enterprise according to  strategic objectives is disclosed. The dominant role of the personnel  component of the resource potential of the construction enterprise is
substantiated, having its management provided by organisational and economic decisions on the selection and placement of personnel  in order to organise the rhythmic and high-quality work of each site and the entire construction site as a whole.