Izvestiya MGTU MAMI

BACKGROUND: Currently, the issue of using means of automation in various ways is widely studied in the worldwide industry. Use of the automatized systems at various stages of manufacturing leads to significant increase of labor productivity in various indicators and ensures solution of multiple problems related to cost reduction during manufacturing, increase of equipment performance and increase of quality of final products.

AIM: Formalization of the process of development of the control program for the CNC by means of creation of the postprocessors for the AksiOMA Control CNC.

METHODS: Key objects of study and interaction during operation are various means of automation (computer-aided design and the software which is necessary for work with postprocessors) necessary for development of products and describing the technology of machining of them with the consequent postprocessing to obtain the control program.

RESULTS: The result of the study is the development of the postprocessors for the consequent postprocessing of the control program has begun on the basis of the problem related to the development of the postprocessor for the AksiOMA Control CNC. In the manual of the CNC programmer, the base notation about the language syntax, control commands for the machining station and the CNC is given. The decision to begin the development of the postprocessor for the three-axial machining by means of editing the Siemens 840 basic postprocessor is made, because the control program syntax of it was similar to the syntax of the AksiOMA Control CNC system.

CONCLUSION: As the result of the conducted study, the role of the automatized systems in the process of design and development of control programs was considered. For solving the problem of the development of the postprocessors for the AksiOMA Control CNC, the IMSpost package for automatized postprocessor development was chosen.

BACKGROUND: For centrifugal pumps, especially those with low specific speed coefficients, the volumetric efficiency is a very important parameter that largely determines the overall efficiency of the pump. Meanwhile, the amount of leakage in the flow part of the pump depends on the shape and size of the slot seals on the impeller. In this paper, the attempt to apply the well-known operational principle of a hydrodiode is made in order to reduce volumetric losses in the pump through a reduction in the flow rate coefficient of the slot seal, whose surface is profiled according to the principles of a hydrodiode.

AIM: Analysis of the possibility of utilizing the hydrodiode-like grooves on the surface of a slot seal in order to reduce the flow rate of liquid through the seal based on the computational fluid dynamics methods.

METHODS: The computational fluid dynamics method based on the solving of discrete analogs of the basic hydrodynamic equations is used in this paper.

RESULTS: The parameters of liquid flow in the slot seals with smooth surfaces, concentric grooves, and proposed profiled hydrodiodes in various sizes and shapes have been calculated. The flow rate coefficients for each type of seal have been determined, and comparative graphs have been built.

CONCLUSION: Based on the findings of this study, it can be stated that, overall, the use of hydrodiodes does not give significant advantages over the concentric groove with significantly increased complexity in manufacturing.

BACKGROUND: The paper considers the concept of using digital twins for diagnostics of faults and analysis of the operation pneumohydraulic drives with a pneumohydraulic booster. This innovative technology hel[s to conduct more accurate and efficient revisions of the systems which contributes to increase of reliability and safety of the equipment. The digital twin gives an opportunity to build the virtual model of the system, which can be used for simulation of various operation scenarios and for definition of potential issues.

AIM: Increasing the efficiency of definition of faults and optimization of operation of pneumohydraulic drives using the innovative approach on the basis of the digital twin.

METHODS: For the successful implementation of this approach, the modern data analysis methods, mathematical modeling and machine learning algorithms were used. A special attention should be paid to accuracy of the data obtained from the sensors as well as to quality of the software for the digital twin model development.

RESULTS: The use of the digital twin ensures reliable definition of faults. The results of the concept prove efficiency and accuracy of the process. This innovative solution increases reliability and productiveness of the systems, cutting the breakdown time of the equipment.

CONCLUSION: The digital twin model helps to forecast faults and increases the reliability of the system operation. The use of the digital twin model improves performance capacity and reduces costs of maintenance of pneumohydraulic drives.

BACKGROUND: To optimize the operation of a hybrid vehicle power plant, it is necessary to select the parameters of its traction battery correctly, which significantly affect the control algorithm and charge-discharge balance. The presence of a method that helps to make a reasonable choice depending on the characteristics of the target vehicle, the conditions and modes of its operation will make it possible to increase energy efficiency indicators.

AIM: Development of the method for calculating the parameters of a hybrid vehicle traction battery using the energy charge-discharge balance of its power plant.

METHODS: A mathematical model of the charge-discharge energy balance has been proposed. Using this model, it is possible to make appropriate calculations on the amount of energy expended by the power plant when a vehicle moving through the stages of the European urban cycle, and to analyze various algorithms for controlling the power plant to achieve maximal energy efficiency, as well as to select capacity and power of a traction battery. The basis for the calculations was the cycle described in the UN Regulation No. 83.

RESULTS: The process of energy accumulation in a traction battery is considered, and criteria for choosing an algorithm for the operation of the vehicle’s power plant are indicated. The energy of vehicle motion in the urban cycle was determined, taking into account the operating time of the units, and the charge-discharge energy balance was calculated, which, in turn, made it possible to find the proper battery capacity. It has been found that the battery charge value at the end of the cycle should be equal to the initial value, which allows the use of a lower capacity battery and ensures maximal energy efficiency of the power plant. Also, based on the calculation results, recommendations were made regarding the optimization of the specific energy and weight-size parameters of the battery.

CONCLUSION: The proposed method is helpful to make a reasonable choice of а hybrid vehicle power plant parameters to ensure its energy efficiency.

BACKGROUND: The current trend of using electric buses has been growing in the last few years. Articulated electric buses also take the routes. These vehicles, due to the presence of heavy traction batteries mainly on the roof, have a tendency to an increased roll angle and a tendency to rollover. Therefore, there is a need to apply anti-rollover measures for such vehicles.

AIM: Development of the control law and algorithm that are capable of decreasing the tendency of an articulated electric bus to rollover by means of reducing the torque.

METHODS: During the development and research of the algorithm, the MATLAB/Simulink simulation environment with the developed mathematical model of spatial motion of an articulated electric bus is used.

RESULTS: The derivation of formulae for calculating the critical turning velocity of sections for articulated vehicles is presented, an algorithm and a traction control law are formulated depending on the turning parameters, the graphs that justify the operability and effectiveness of the algorithms are presented.

CONCLUSION: The practical value of the developed algorithm lies in its practical application on an articulated vehicle in order to reduce the tendency to increased roll angles and to protect it from rollover.

BACKGROUND: Aspects related to daily human activities, features of indoor activities, such as lighting settings, integration with building systems and changing locations during the day in various places, are largely ignored in lighting control systems based on generally applicable values and regulatory standards. The modern intensive rhythm of life, which implies the widespread use of new, constantly improving technologies, frequent changes in the environment — all this creates the need for a modern approach to the study and application of an intelligent lighting system.

AIM: Development and research of operability and functioning quality of the electro-technical facilities, systems and their components in various modes, under various external influences.

METHODS: Design of lighting systems in the Autodesk AutoCAD software, calculation of quantity and activation areas, as well as implementation of biodynamic lighting using the AWADA application.

RESULTS: In this paper, the study object is the ‘Dom.RF’ pavilion facility built in 2023 for the ‘Russia’ exhibition on the territory of the Exhibition of Achievements of National Economy (VDNKh). The pavilion was planned to show the image of a new market for individual housing construction, ensuring comfortable living in a harmonious environment [2]. This paper contains a technical and economic comparison of the implemented lighting systems and the use of biodynamic lighting. The practical value of the study lies in the operability testing, development and design of the biodynamic lighting designed for a public building used as an exhibition pavilion.

CONCLUSION: A complete package of measures for replacement with the development of an effective, ecological and safe implementation of biodynamic lighting for the technical facility of the pavilion, including the creation and operation of components, has been developed.