Search

Search Results

• SIMULATION MODELING OF MILK HEATING BY THE ENERGY OF MICROWAVE FIELD

  N.N. Kisel, А. А. Vaganova, I. A. Vaganov

  2020-10-11

  Abstract ▼

  Heat treatment of dielectric materials and food products is one of the important directions in
  the development of the production of various products. The use of the electromagnetic field energy
  of ultrahigh frequencies for drying, heating, defrosting and pasteurizing food products is promising,
  since such technologies are suitable for processing various dielectric materials and, at the
  same time, are efficient and environmentally friendly. Despite many developments in the field of
  microwave processing of materials, the creation of a universal device suitable for heat treatment of
  any kind of materials is difficult because of the variety of their shapes and sizes, as well as the
  significant difference in the electrical properties of variouse dielectrics. Therefore, in each specific
  case, it is required to create an optimal design of the device and choose the option for exciting the
  electromagnetic field. This work is devoted to modeling the absorption of energy of the microwave
  electromagnetic field in a device for milk pasteurization. Using CAD FEKO, a 3D model of the
  device was built and its operation was modeled. The study of the influence of the angle of inclination
  of quartz tubes on the distribution of the electromagnetic field in the waveguide is carried out.
  The results show that most of the power is absorbed closer to the beginning of the waveguide, and
  this phenomenon is more pronounced with an increase in the angle of inclination of the tubes.
  On the basis of performed calculations, the optimal angle of inclination of the tubes was determined.
  The influence of the diameter and material of the tubes was also considered. The distributions
  of the electric field and specific power absorbed per kg of dielectric in the waveguide are
  obtained. The accuracy of the results is evaluated. Possible modifications of the proposed design
  of the pasteurization device can be made by choosing other variants of the arrangement of the
  tubes with milk. The thickness of the tube's walls can also affect the absorbed power. In addition,
  the composition of milk can change its electrophysical properties, and therefore can also affect the
  level of absorbed power. However, these questions require further research.

• SIMULATION MODELING OF GRAIN HEATING BY THE ENERGY OF ELECTROMAGNETIC MICROWAVE FIELD

  N.N. Kisel , А. А. Vaganova, A. N. Savitskiy

  2020-10-11

  Abstract ▼

  High speed and efficiency of microwave heating of dielectrics makes it possible to use the
  electromagnetic field to heat and dry almost any material containing moisture. One of the promising
  areas for the use of microwave energy is the intensification of the grain drying process.
  To ensure rapid prototyping and reduce the possibility of losses caused by errors at various stages
  of equipment development and implementation, model development is of particular importance.
  The purpose of this work is to perform simulation of a slotted waveguide grating for grain drying.
  The main task of the simulation is to ensure an even distribution of power to each slot. A specialized
  software package FEKO is used as a modeling environment. To describe the model, an exact
  calculation method is used - the method of moments. The distribution of the electric field and specific
  absorbed power in a layer of grain exposed to microwave radiation is obtained. The models
  were verified by comparing the results obtained with different mesh values of surface elements.
  Modeling the distribution of the electric field strength showed that moving the waveguides away
  from the cell with the grain leads to the leveling of the field irregularities, but in this case some of
  the radiated power is dissipated into space. In this case, an increase in the distance between the
  waveguides and the cell with grain does not affect the antenna SWR. It should be noted that in a
  real situation, the wave nature of the field is smoothed out due to heat transfer, and this phenomenon
  cannot be taken into account in the process of electromagnetic simulation. In addition, the
  entire variety of possible changes in the dielectric parameters of grain should be investigated in
  order to analyze the process of wave propagation in grain with high moisture. It is also advisable
  to consider other modifications of slotted waveguide antennas, which can provide more uniform
  heating in the container with grain.

• STOCHASTIC DYNAMIC MODEL OF UNDERWATER WIRELESS SENSOR NETWORK BASED ON LOUVAIN CLUSTERING ALGORITHM

  А.М. Maevsky , V.А. Ryzhov , Т. А. Fedorova , I. V. Kozhemyakin , N.М. Burov

  62-81

  2025-07-24

  Abstract ▼

  Underwater wireless sensor networks (UWSNs) play an important role in monitoring ocean processes, underwater navigation, environmental control and security. However, underwater environment features such as high signal attenuation, limited energy resources and changing network topology create significant challenges in organizing efficient data transmission. To optimize network operation and extend its service life, a clustering method is used to group nodes, reduce the load on communication channels and improve energy efficiency. However, in the event of network node failure, static clustering becomes ineffective, which requires the implementation of dynamic reclustering. The procedure of redistributing node roles and rebuilding the network topology allows maintaining communication stability and minimizing data losses, taking into account the energy balance of the entire network as a whole. This paper examines modern approaches to clustering and reclustering in UWSNs taking into account the energy balance, node failure probability and interference in the transmission medium. The development of adaptive UWSN control methods is an urgent task aimed at increasing the reliability, energy efficiency and durability of underwater communication networks. The article presents a stochastic cross-level model for dynamic three-dimensional PBSNs of arbitrary topology. The model uses a new clustering/reclustering technique based on the Louvain algorithm, a routing protocol built on the Dijkstra method, and a time-domain management (TDMA) method. The proposed PBSN operating model is the basis for the developed simulation complex, which allows assessing the efficiency and reliability of the network, taking into account the loss of connectivity and vulnerabilities for PBSNs of various scales and purposes. As part of the research, a parametric analysis of systematic calculations of the PBSN functional characteristics was performed. The results of the analysis showed that the proposed simulation model provides an increase in the autonomous network operation time and a decrease in the number of lost messages compared to the models of other authors

• DESIGN AND SIMULATING GENERAL APPROACHES OF AN ARTICULATED WHEELED-LEGGED CHASSIS OF THE LUNAR ROVER

  А.V. Vasiliev , I.V. Shardyko , Y.А. Zhukov

  2026-04-29

  Abstract ▼

  The paper considers the problem of constructing a chassis for a research lunar rover with ultra-high traversability over uncertain terrain with soft soil. Direct remote and supervisory control of modern complex robotic systems in non-deterministic environment places an increased workload on the operator, especially in the case of high-traversability mobile platforms with a large number of degrees of freedom (DoF) requiring coordinated control. In this regard, the problem of automating the movement of such a multi-DoF chassis as well as automating the motion planning depending on situation based on sensor feedback becomes relevant. This article proposes a concept for a multi-degree chassis for a research lunar rover, including a design and layout scheme of the chassis and a method for its application, i.e., motion algorithms on various types of rough terrain. A methodology for control algorithms design is proposed, and a brief description of the developed algorithms and the simulation models of the chassis for its preliminary testing is provided. The final outcome of this work is expected to be a number of experimentally obtained characteristics of the laboratory chassis model and the verification of the developed computer models and control algorithms of the multi-DOF chassis. Completing these tasks will provide scientific and technical groundwork for the motion control of wheeled- legged systems and improve the quality of lunar rovers' modeling and design. The results obtained at this stage allow us to move on to the manufacturing an experimental prototype and conducting physical experiments on this prototype to test the developed algorithms and simulation models. Experimental verification of the multi-DoF chassis control algorithms and their design methodology will improve the level of autonomy of future mobile robots designed to operate in extreme off-planet conditions