2024 № 5 Електротехніка і Електромеханіка
Постійне посилання колекціїhttps://repository.kpi.kharkov.ua/handle/KhPI-Press/80545
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Документ Increasing the damping properties of the magnetorheological actuator of the vehicle suspension control system(Національний технічний університет "Харківський політехнічний інститут", 2024) Dushchenko, V. V.; Liubarskyi, B. G.; Masliev, A. O.; Nanivskyi, R. A.; Masliev, V. G.; Ahapov, O. M.; Iakunin, D. I.In accordance with one of the ways of solving the problem of increasing the smoothness of the vehicles, a controlled suspension is proposed, which is created on the basis of the use of «smart» materials – magnetorheological elastomers, the mechanical properties of which, in particular, damping, can be changed with the help of a controlling magnetic field. This is implemented with the help of the magnetorheological actuator of the suspension control system, which has the form of an elastic bushing of the suspension arm, consisting of several electrically connected in series toroid-like coils (with a core of magnetorheological elastomer). The device is powered by current, the value of which is controlled by the operator, or automatically, depending on the road profile and driving mode. Magnetorheological actuators (elastic bushings) are placed in the holes of the suspension levers instead of standard rubber ones and combined with a controlled current source. Thus, the suspension becomes controllable, which makes it possible to set the necessary vibration damping of the vehicle body to increase its smoothness. Problem. The disadvantage of the previous designs of the magnetorheological actuator is the insufficient amount of the magnetic flux density and the unevenness of its distribution within the elastic bushings. As a result, the damping properties of such controlled suspensions become insufficiently effective, which reduces the possibility of increasing the smoothness of the vehicles. The purpose of the work is to increase the damping properties of the magnetorheological actuator of the vehicle suspension control system, which will increase the control efficiency. The task is to improve the design of the performing magnetorheological device, to carry out calculations and develop a calculation scheme of the study, to determine the average magnetic flux density value and its distribution across the cross-section of the device, to calculate the dependence of the device damping indicator on the magnetic flux density, to compare the damping indicators of the improved device with previously known ones. Methodology. Research tasks were solved on the basis of magnetic field analysis using methods of magnetic field theory and SOLIDWORKS® and FEMM software packages, as well as analysis of the dependence of the damping properties of bushings from magnetorheological elastomers on magnetic flux density. A description of the design and principle of operation of the magnetorheological actuator of the vehicle suspension characteristics control system is given, based on which the calculation scheme was developed. Results. The results of research calculations showed that the average value of magnetic flux density in the proposed design of the device reached 0.85 T, its distribution became fairly uniform, and there were no zones where it was abnormally small. For the first time, the dependence of the damping index on the magnetic flux density of the controlling magnetic field has signs of scientific novelty. It was found that this indicator for the proposed design of the device increased by 22 % compared to previous other designs, which will increase the efficiency of the control system and the smoothness of the vehicle. A positive result was achieved due to the following features of the proposed design of the suspension actuator: the elastic sleeve consists of several coaxially located actuators made of anisotropic magnetorheological elastomer, in which the conglomerates of the ferromagnetic filler during the manufacturing process are located collinear to the direction of the angular deformations of the sleeve and the control magnetic field flux density vector, and the devices have control coils located on their surfaces, which are made of conductive elastic elastomer and electrically connected in a series circuit. Originality. The control method, previous designs and construction of this controlled suspension are protected by patents of Ukraine. Practical value. The direction of further research is to optimize the parameters of the control coils in order to reduce the energy consumption for them and to protect them from overheating.Документ Magnetic field of electrical heating cable systems of the floors for residential premises(Національний технічний університет "Харківський політехнічний інститут", 2024) Rozov, V. Yu.; Reutskiy, S. Yu.; Pelevin, D. Ye.; Kundius, K. D.In order to effectively protect public health from the magnetic field of electric heating cable systems of the floors, it is necessary to reduce it to a safe level. However, this requires careful study of the magnetic field. The purpose of the work is to develop a mathematical model and a verified methodology for calculating the magnetic field of electric heating cable systems of the floors in residential premises, and assessment of compliance of the magnetic field with the normative level. Method. A methodology for calculating the magnetic field of electric heating cable systems of the floors in residential premises has been developed. Scientific novelty. Based on Bio-Savar’s law and the principle of superposition, an analytical model of the magnetic field of electric heating cable systems of the floors and its calculation method was created. The magnetic field of the coaxial heating cable is determined, taking into account the value of its maximum eccentricity. The experimentally substantiated correctness of the obtained theoretical statements, which is confirmed by their coincidence with the results of the experiment with a spread of less than 7 %. Practical significance. A verified methodology for calculating the magnetic field of electric heating cable systems of the floors was proposed and an assessment of compliance of their magnetic flux density with the normative level of 0.5 μT was performed. It is recommended to lay modern two-wire heating cables at a depth of at least 75–100 mm from the floor. With a smaller laying depth, it is recommended to use coaxial heating cables, which have an order of magnitude smaller magnetic field.