TRANSPORT, MINING AND BUILDING MACHINERY ENGINEERING
Introduction. Construction in Kazakhstan is one of the leading sectors that has a significant impact on the development of a large number of related industries of the Republic of Kazakhstan. No construction is complete without road construction equipment. Despite the positive developments in the industry including the park of the main construction machinery, things are still more difficult than that. The acquisition of new machine base, with working bodies’ equipment is very expensive. It is economically expedient to develop hinged working bodies on the basic machines existing in Kazakhstan enterprises.
Materials and methods. According to the demonstrated problem, the article considers the method of morphological analysis to identify new types of working bodies of digging machines. Moreover, the main classification features of the working bodies of excavating machines are determined in the research and the number of trajectories of the working element’s movement is established.
Results. The constructed morphological tree is presented and as a result of such method, the 484 possible and existing designs of working bodies of excavating machines are revealed. A set of conditions for excluding the unacceptable options for hydro mechanical and mechanical working bodies from the hypothetical working bodies is formulated.
Discussion and conclusions. Suspended tunneling equipment could be used for both trenching and well drilling, and such processes are evidenced by the patent for the design.
Introduction. To solve the indirect measurement problem of the cargo weight lifted by the excavator in crane mode the authors propose the specific method and develop mathematical model according to the indications of hydraulic fluid pressure sensors in the piston and rod cavities of boom lifting cylinders. Moreover, the signals from the angle sensor of the boom and the handle relative to the gravity horizon are used, the roll and pitch sensors of the rotary column of the excavator relative to the gravity horizon are additionally applied.
Materials and methods. As initial data of the indirect measurement method of cargo mass, constant design parameters, constant masses of moving links are used, such as booms with handle hydraulic cylinder, handles with bucket hydraulic cylinder and bucket turning mechanism, bucket weight. In addition, constant linear number and angular machine dimensions are included in the investigation. To obtain analytical formulas of the method, the method of homogeneous coordinates is applied, as well as the method of direct analytical inference.
Results. The developed design scheme of the method is presented. As a result, the position of the excavator crane is described in the right-hand rectangular coordinate system. Moreover, the technique of indirect measurement of cargo mass according to the indications of hydraulic fluid pressure sensors in the form of formulae linear sequence is presented.
Discussion and conclusion. The accuracy of the developed method was estimated by comparison with the results of the full-scale experiment. The relative reduced measurement error in the range of boom angles’ measurement and the crane-excavator handle was less than ten percent. Therefore, the technique merits are its simplicity, as well as record of the roll and pitch angles of the crane-excavator turntable element.
TRANSPORT
Introduction. The article concentrates on the mathematical modeling features of the organization of passengers’ transportations by motor transport in stop-transfer point (STP) with the multiple change of passenger traffic, which is characteristic for resort municipal formations, and also at the organization of sports, cultural and other mass actions.
Materials and methods. Materials are presented and a mathematical model is developed, based on the formalization of the STP functioning, as an infrastructural object intended for realization of the transportation process by various types of passenger transport. In addition, compliance with the conditions of the rolling stock rhythmicity on the STP is considered as the basic operating condition.
Results. Consequently, the problem of finding the optimal structure and number of bus transport substation units for the STP functioning parameters and the condition for full and timely development of the repeatedly changing passenger flows in it is solved.
Discussion and conclusions. The results of mathematical modeling of passengers’ transportations by motor transport allow estimating parameters of functioning of STP and efficiency of management in the conditions of repeatedly changing passenger flows. Therefore, the involvement of additional carriers, flexible planning of routes and schedules according to the regularity of bus traffic, the rhythm of the buses interaction and other types of passenger transport interaction in the STP during peak periods of loading, which ultimately ensures the efficiency and quality of transport services to the population, are considered as control actions.
Introduction. The article presents the results of the comprehensive comparative study of economic efficiency of the rolling stock on urban transport, such as trolley with dynamic charging and diesel bus, in order to solve a new problem for a large city of identifying more profitable vehicle in terms of economic, environmental and time factors.
Materials and methods. Such methods as index, comparison methods and methods of analytical calculations and dynamic series analysis are applied in the research.
Results. As a result, the algorithm of the transport mode choosing and step by step instructions of the comparison, wherein the integrated approach to the assessment of performance, was established. In addition, the necessity of supposed recommendations’ application on implementation of comparison process of technical, operational and economic indicators, which take into account the revealed advantages and shortcomings of the existing types of the rolling stock was proved on the basis of the hybrid trolley and bus on diesel fuel.
Discussion and conclusions. The statistical study of dynamics’ series of environmentally friendly urban modes of passenger transport by the following factors as the operational length of trolley and tram routes, volume of passenger traffic on public transport in the Russian Federation and also in Volga Federal District and its regions. The model of step-by-step process of calculation of transportations’ prime cost by alternative modes of transport is offered on the example of trolley with dynamic recharging and city bus.
Introduction. Thanks to the development of microelectronics the design of modern vehicles is saturated with microprocessor control systems. Equipping of transport machines by the course stability system, adopted at the legislative level abroad and planned in the Russian Federation in the nearest years, requires the adaptation of domestic normative-technical documentation for possibility of diagnostics, maintenance and current repair of automobiles. Such situation appeared due to the lack of effective method of diagnostics vehicles with mechatronic control systems during operation. Consequently, it is not possible at the automobile service enterprises to assess the changing in the technical condition of the transport machines at once, as well as to monitor the adequacy control of the governing decisions.
Materials and methods. The research proves the increase in efficiency of the vehicles’ diagnostic procedure with course stability system due to the implementation of three-stage system, proposed by the authors of the article and compared to two-stage, which is currently being implemented at automobile service enterprises.
Results. As a result, realizing algorithm of the transport machines’ diagnostic method, equipped with the course stability system and based on the three-stage system of technical diagnostics was developed and implemented.
Discussion and conclusions. Application of realizing algorithm at automobile service enterprises would assess the automobiles’ technical condition with mechatronic control systems at operation stage and would help to monitor the governing decisions’ adequacy, to predict residual resource and give recommendations on necessary mode and volume of maintenance and current repair.Introduction. The article represents the mathematical model of commercial vehicle’s hydraulic retarder. The model is based on the mathematical model of the variable filling hydraulic dynamometer.
Materials and methods. The retarder model was designed with the possibility of its integration with the mathematical model of the engine cooling system. For this purpose, the state function of fluid temperature in a working chamber of the retarder was added to the retarder model. Consequently, fluid compression in the working chamber was included into the model to avoid unlimited filling because of possible high pressure at the retarder inlet.
Results. The simulation model of the retarder was established as LMS Amesim submodel using C-programming language. For testing, the retarder simulation model was integrated with the Amesim models of the engine cooling system and with the powertrain and vehicle movement dynamics. In addition, brake torque regulation wassynthesized on PI controllers.
Discussion and conclusions. During simulation of the vehicle movement on the mountain route expectable results were obtain, such as continuous braking via the retarder, which led to increasing of the cooling system’s fluid temperature. Therefore, overfilling of the retarder working chamber didn’t occur through the fluid compression. The retarder model could be applied to determine retarder design influence at vehicle functioning. For instance, it could be used for development of the algorithms’ control.
Introduction. The article discusses the question of applicability of the calculation assessment method of resistance for details from gray cast iron after thermal diffusion hardening. The purpose of research is to check applicability of the calculated model for determination of intensity in case of the variable blanket hardness.
Materials and methods. The model of intensity dependence on contact of two disks of friction gear is used in the research. Calculated determination of parameters is executed in two options: contact of the steel disk and disk from gray cast iron with the strengthened layer, and contact of the steel disk and disk from the tempered high-strength cast iron. Thus, roughness corresponding to the earned extra surface in contact zone is created. Experimental check of received results is carried out by means of specific work of abrasive wear definition for gray cast iron with the strengthened layer and the high-strength tempered cast iron.
Results. As a result, it was established that the resistance of details from gray cast iron with the strengthened layer is comparable to high-strength cast iron after hardening. The results of experimental check prove the obtained calculations since the parameters values of resistance received would be well coordinated. Therefore, the possibility of the calculated resistant technique usage for such case could be considered as proved one and, therefore, it could be used at design calculations of the frictional units containing details from gray cast iron with the strengthened layer.
Discussion and conclusions. The considered way of superficial hardening needs to be applied depending on features of operation on frictional unit. In such case, when the allowed values of wear change in wide limits (for example, brakes, coupling, etc.) it would be better not to subject a blanket to machining where the formation of optimum parameters of friction surfaces happened in natural way, or it would be necessary to delete an allowance. This suggests that the calculation method of the determination of layer resistance enables to define concrete values of an allowance which needs to be deleted.
CONSTRUCTION AND ARCHITECTURE
Introduction. Inadequate study of the organization of construction in the project documentation is one of the factors that contravene the planned dates for putting objects into operation. Probabilistic graphs make it possible to obtain more justified timeframes for performing individual works, and even the entire project by proceeding a given level of reliability.
Methods. The research illustrates the process of building bridges as a complex hierarchical system, functioning in conditions of the initial data stochastic uncertainty. The feature of the proposed integrated approach to the construction organization design is the combination of different methods’ elements of computer-aided design in the MS Project environment. The simulation is based on the generalized network model, calculated on the basis of the matrix (type of work - private work front) by the critical path method. Thus, positive and negative bonds’ stretching in the work interaction as well as organizational breaks could be deterministic, random and probabilistic. The application of the PERT methodology at the stage of preliminary risk assessment in investment projects of bridge construction is substantiated.
Results. As a result, the duration of the construction of the real object by calculation in the MS Project was determined under pessimistic, optimistic, normative and expected work duration. The risks’ evaluation of the project implementation in the established time frame was presented. In addition, the example of organizational and technological solutions for bridge crossing by using summer and winter construction seasons was considered.
Discussion and conclusions. The algorithm for informational modeling of bridge construction organization is developed. The purpose of such simulation is reliable forecast of construction dates in conditions of statistical uncertainty of time parameters of technological processes. Therefore, the direction of further research would be connected with the justification of the choice of solutions based on the set of acting random factors.
Introduction. The article presents results of the empirical dependence analysis of transverse force in the inclined section of reinforced concrete elements.
Materials and methods. Long-term application of such dependence at the reinforced concrete design demonstrates high parameters’ reliability. Thus, analyzed information could be used in innovated calculation model, which includes joint action of cross forces and bending moments.
Results. The analysis of empirical dependence by the design standards seems to obtain information about the limit value of shear stresses in the compressed zone of inclined concrete and their interrelations with normal stresses. The results of the analysis were tested on computer models of the beam using finite elements. It does, however, assume that the shear resistance is specifically related to compression resistance by means of a special coefficient, which could be determined by computer simulation.
Discussion and conclusions. The calculated values of the inclined section of reinforced concrete elements in the transverse bending could be specified by experimental or computer modeling.
ECONOMIC SCIENCES
Introduction. The article is devoted to the revealing of the tendencies of social and economic development and to economic security of the territories. The research summarizes the concept of economic security of the territory and the ways of its evaluation, also presents the author’s methodology for determining the trends in the development of municipal areas by the context of economic security on the example of Omsk region.
Materials and methods. Indices of economic security in the economic, social and financial spheres and an integrated index are calculated, basing on the data of the Territorial Body of the Federal State Statistics Service for Omsk Region, which characterize the socio-economic development of municipal regions. The grouping of the obtained values and their visualization with the help of GIS technologies helps to demonstrate the development tendencies of the municipal areas of Omsk region.
Results. The article substantiates the ways of grouping the indices of economic security and their visual representation for assessing the trends of socio-economic development of municipal areas. As a result, the tendencies of social and economic development of the municipal districts of Omsk region in 20142016 are demonstrated in the context of economic security based on the author’s methodology.
Discussion and conclusions. The revealed positive trends in the development of municipal districts’ economy of Omsk region are offset by negative trends in the social sphere. Therefore, most of the municipal districts of Omsk region are classified as “moderate implementation of threats” to the level of economic security in 2016. The revealed tendencies reflect problematic issues, to which the municipal and regional authorities of Omsk region should pay special attention.
Introduction. The article is devoted to analysis of the indicators’ dynamic that characterizes the quality of working life level in the Russian industrial sector. The aim of research is to identify and assess the influence of working life quality on economic efficiency of labor.
Methods. The system of indicators for the period from 2005 to 2015 is determined on the basis of the analysis of existing assessment methods of working life quality and on official statistics data, which reflects the main elements of working life quality. Therefore, the most significant indicators of working life elements in terms of labor efficiency are determined by means of correlation analysis.
Results. It is revealed that social guarantees, decent wages and safe working conditions, i.e. objective characteristics of working life quality, have the greatest impact on labor efficiency. As a result, the subjective characteristics such as job satisfaction and opportunities for self-expression and selfrealization, despite the long period of the market economy development, continue to play a secondary role. The demonstrated problem confirms the fact that the main block of working life quality for industrial workers is not fully ensured and is deterrent to the growth of labor efficiency as a socio-economic category.
Discussion and conclusions. The results of this research indicate the availability of reserves to improve labor efficiency through the usage of modern methods of production organization to ensure economic conditions of decent work of industrial workers.
Introduction. The article deals with the basic structural elements of strategic planning at the motor transport enterprises, especially in the conditions of the international political processes related to the global crisis and the anti-Russian sanctions, which would affect the competitiveness and sustainability of enterprises. Such situation forces to look for competitive advantages sources in the composition of resources to determine the direction of investment, without which the way out of the crisis would drag on. It is impossible to retain competitive advantages for a long time by representing the existing speed of technology change. Therefore, the task of monitoring and rapid response to changing complex potential as a combination of various resources becomes urgent.
Materials and methods. Key competencies are found only by comparison with competitors in a wellorganized regional information system, capable of accumulating and providing business information on demand for the development of civilized business relations in the transport field. In addition, the process of the enterprise competitive rating monitoring as a structural element of the resource strategy methodology based on the integration-priority approach allows determining its key competencies.
Results. Basing on the factor analysis’ usage, the model, in which the final indicator (competitive rating of the enterprise) is decomposed according to the types of potentials, is presented. Consideration as a competitive advantage of enterprise resources’ type satisfies the idea accepted initially in the resource theory.
Discussion and conclusions. Technology monitoring of competitive rating implies the creation of the response center, which would control the indicators’ dynamic responsible for the complex potential magnitude.
ISSN 2658-5626 (Online)