Грачев Николай Николаевич

Ensuring Electromagnetic Compatibility of Radio Electronic Equipment in Conditions of Formation of Unintentional Contact Radio Interference

2021 · CHAPTER · en

Development and analysis of models for the formation of contact radio interference under deterministic and random mechanical effects on the contact mechanical joints of moving objects

2021 · CHAPTER · en

The article deals with the aspects of applying the general theory of systems to the problems of ensuring electromagnetic compatibility in mobile radio communication complexes. To solve this problem, models were constructed for the formation of contact radio interference under deterministic and random mechanical effects on the contact mechanical connections of moving objects. The dependences of the amplitude of the modulus change and the phase amplitude of the total electric contact current transfer coefficient on the amplitude of this variable contact force were obtained. Contact interference refers to a class of interference created as a result of the influence of the electromagnetic field of a radio transmitter in the near zone on conducting mechanical contacts with a nonlinear and time-varying electrical resistance or on variable contacts that are repeat emitters (secondary emitters) of the electromagnetic field. When moving mobile communication nodes, the frequency division between transmitting and receiving radio devices is determined by the bandwidth affected by contact interference.

Development and Analysis of a Linear Model of Contact Interference in Radio Reception

2020 · CHAPTER · en

Among all classes of unintended electromagnetic interference, contact noise is the most unexplored. Contact interference refers to the class of interference caused by the electromagnetic field of a radio transmitter in the near field on conductive mechanical contacts with non-linear and time-varying electrical resistance or on variable contacts that are re-emitters (secondary emitters) of an electromagnetic field. The presence of such contacts forming the system is characteristic of a moving object (ship, car, tank, plane, train, etc.), on which transmitting and receiving radio electronic means (EM) operate. During the operation of the transmitter, contact interference affects the receptor mounted on the same moving object, and, as a rule, this influence is greater, the greater the speed of the object, which indicates a direct dependence of these interference on vibrations and mechanical shocks that affect the change in contact density. The paper presents the results of theoretical studies of the processes of formation and propagation of contact radio interference using an example of a linear model of the formation of contact radio interference.

Complex Modeling of Physically Inhomogeneous Processes in the Problem of Increasing the Reliability of Radio-Electronic Equipment

2020 · CHAPTER · en

The authors propose a new method for increasing the reliability of radio-electronic equipment, which involves obtaining deterministic reserves for thermal and associated electrical and mechanical loads of electrical components. These reserves should be used as additional indicators for calculating probabilistic reliability indicators at enterprises. The currently used method of calculating using only probabilistic laws of quantities distribution is not subject to practicale verification in tests. Many of the values used in calculations are averaged. The authors show that the use of real coefficients of electrical, thermal and mechanical loads in the reliability analysis of electric components will give a real effect, because developers will be able to avoid violating the modes of their use. Using the latest advances in information technologies in the field of physical processes modeling with the requirement to take into account the relationship of these processes with each other will increase the reliability of the designed radio-electronic equipment.

Modeling of Contact Interference Appearance in Cyber-Physical Systems of On-Board Equipment

2020 · CHAPTER · en

The article presents the results of studies of the mechanism of formation of contact radio interference arising from the action of electromagnetic radiation from a transmitter on conducting mechanical contacts with a time-varying electrical resistance or on alternating contacts, which are secondary emitters of an electromagnetic field. The article analyzes the results of theoretical studies of the mechanisms of formation and propagation of contact radio noise generated by mobile electronic objects, using the example of a study of non-linear models of the formation of contact radio interference.

Вопросы оптимизации проектирования РЭС с учетом ЭМС

2019 · CHAPTER · ru

В рабоет рассматриваются результаты исследований обеспечения электромагнитной совместимости радиоэлектронных средств на основе решения комплексных задач оптимизации конструкторских и схемотехнических решений. В зависимости от объема информации, которую необходимо получить в результате проектирования, блок проектирования может представлять собой либо набор небольшого числа простейших формул, либо сложнейший алгоритм..

Analysis of Ensuring Stability of Metrological Characteristics of Velocity Head Meter in Flight Conditions of Aircraft in Upper Atmosphere

2019 · CHAPTER · en

When measuring small, slowly changing physical parameters, such as parameters of the velocity of low-density gas flows, small values of aerodynamic forces, aerodynamic forces acting on aircraft in conditions of a rarefied gas environment, electrical signals coming from primary converters often have a low level, sometimes reaching very small values, is much less than the level of noise and interference. The most acceptable way of measuring such physical quantities in obtaining reliable results is the electromechanical modulation (interruption) of the oncoming gas flow by means of flow interrupters, which allows obtaining the required higher amplification of the signal of the modulated signal, it is easy to separate the modulated signal from the unmodulated noise and interference signal, even if the level of the useful signal is lower than the level of noise and interference. Successful in solving such a problem is the use of signal accumulation, which increases the signal-to-noise ratio at the converter output. The paper presents the results of an investigation of a high-speed pressure transducer for a gas medium of low density. The stability of the metrological characteristics of the converter is investigated using the method of probabilistic study of the stability of the output characteristic of a membrane-capacitive converter to determine the optimum frequency of electromechanical transformation and to ensure the specified accuracy and stability of its metrological characteristics, taking into account the random nature of the deviation of structural and electrophysical parameters associated with destabilizing factors and technological factors.

An Integrated Approach to Ensure Electromagnetic Compatibility in the Design of Electronic Devices

2019 · CHAPTER · en

The article discusses an integrated approach to the design of EM, taking into account the provision of electromagnetic compatibility parameters. The article considers the original approach with the help of which the study of general integrated noise immunity is carried out because of the criteria providing noise immunity and noise immunity. The stated principles of the design approach allow us to solve the problem of applying optimal circuitry and design solutions in the design of noise-resistant and noise-resistant EM.

Analysis of Contact Disturbance Spectra Generated inTraveling Vehicles

2019 · CHAPTER · en

В данной статье сформулирована задача анализа спектров контактных возмущений по порядку оценить их влияние на качество радиосвязи в транспортных средствах. Рассмотрена эквивалентная схема излучающей цепи. Электрические параметры цепи излучения оцениваются на примере кузова Моделирование тока излучающей цепи было выполнено и его спектр получен.

Non-contact Method for Assessing the Quality of Assembly of Electronic Devices Based on Registration and Analysis of Contact Radio Interference

2018 · CHAPTER · en

The paper presents the results of research that can be put into the development and research of non-contact rapid method for assessing the quality of the assembly and installation of EM designs. To achieve the objectives, studied the behavior of the mechanical connection of the contact pairs, namely the definition of the contribution of R, L, C parameters contact joints in the modulation level and the spectral composition of the electromagnetic radiation mechanical contact pair. The method is based on the registration and analysis of artificially excited by contact noise when exposed to mechanical vibrations and harmonic electric high frequency signal on structural elements EM. Considered in the field of electromagnetic compatibility (EMC) as an undesirable phenomenon, the formation of contact interference can be used to evaluate the mechanical properties of a wide variety of designs and hardware devices, including the quality of assembly and installation (especially related to the effort of tightening fasteners).