SELF-SIMILAR STRUCTURES IN BIOMECHANICS. HUMAN VIBRORECEPTORS

The concept of dynamic-fractal self-similar structures (dynamic fractal) is introduced. This concept consists in scaling the dynamic, i.e. elastic-inertial parameters of the forming cells. It is shown that a dynamic fractal decreasing in length amplifies the incoming signal along the structure. A dynamic fractal that increases in length, on the contrary, has the good vibroisolation properties, the attenuation intensity in which is higher than in the periodic structure. The dynamic properties of the Pacini corpuscle, which is a human vibration detector, are investigated. Its mechanical model is constructed. It is shown that the vibroreceptor is a dynamic fractal with parameters decreasing in length. Therefore the vibroreceptor amplifies the incoming signal, which makes it possible to detect even weak vibration effects on a person

ВОЛНОВОЕ ВОЗДЕЙСТВИЕ НА ЧЕЛОВЕКА И ТКАНЫЕ ЭЛЕКТРОНАГРЕВАТЕЛИ

In this work, we determined how wave signals within the long-wave IR range affect a person. The novelty in this work is the use of woven electric heaters, not only to generate a wave signal that affects a person, but also to receive a response signal from a person to this effect. This method is patented. The work is of interest to medical professionals, as well as to specialists involved in the creation of products based on woven electric heaters for humans

SOME RESULTS OF STUDIES OF THERMAL FIELDS OF CARBON YARNS

In the present work, a study of the thermal properties of a carbon yarn was carried out. Were obtained different thermal fields at different structures of the carbon yarn. It was found that thermal fields are highly heterogeneous in the presence of defects in the form of nodes. The novelty of the work is the synthesis of the structure of the cross-section of a carbon yarn using fractal geometry methods. The results of the work can be used in the development of non-destructive testing techniques and in the design of woven electric heaters

EXPERIMENTAL RESEARCH AND MODELING OF DEFECTIVE STATES OF MECHATRONIC SYSTEMS WITH MECHANISMS OF CYCLIC ACTION

The results of experimental studies and mathematical modeling of the processes of the appearance of defective states of turntable mechanisms are presented. The main criteria for the operational state of the mechanisms, including the cycle time and the value of the error of angular division, are identified. The complex of diagnostic signs for recognition of defects of mechanical and hydraulic systems of rotary table is offered.

РЕГУЛЯРНЫЙ (ФЛУКТУАЦИОННЫЙ) МЕТОД НАХОЖДЕНИЯ ИНТЕГРАЛОВ СТОЛКНОВЕНИЙ И ПРОБЛЕМА ЛИНЕЙНОГО ОТКЛИКА ПЛАЗМЫ

The regular (fluctuation) method of finding collision integrals proved to be effective in solving the problem of linear response of plasma. The method is sufficient if the linearization on the external electric field is carry out in the Liouville equation itself.

NUMERICAL CALCULATION OF THE STIFFNESS OF THE ELASTIC BLOCK OF THE HYDRAULIC SUPPORT SHELL BY THE FINITE ELEMENT METHOD

The article presents the calculation of the stiffness of the elastic shell of hydraulic supports by the finite element method. This calculation is necessary to know the safety margin of the rubber shell, since with an increase in the resulting vibration, the service life of the MR-hydraulic support decreases, leading to its destruction [1, 2]. The purpose of this study is to calculate and evaluate the maximum shear deformations of the rubber shell of the hydraulic support necessary for the subsequent determination of the stiffness and damping of the hydraulic support at resonant frequencies. The finite element method is used to estimate the maximum shear deformations of the rubber shell of the hydraulic support caused by variable loads.

PRODUCTION TECHNOLOGIES FOR COMPOSITE PARTS AND THEIR APPLICATION IN RAILWAY INDUSTRY (OVERVIEW)

The article provides an analysis of modern composite technologies, as well as the possibility of their application in the railway industry. Advantages and disadvantages of technologies are shown, main types of products manufactured with these technologies are given. An approximate cost comparison of products manufactured using various technologies is made.

STUDY OF STRUCTURAL TRANSFORMATIONS AT INCREASED TEMPERATURES IN α-TITANIUM WITH NON-METALLIC TRACE IMPURITIES

Structural changes in α-titanium containing non-metallic trace impurities at elevated temperatures have been studied by differential scanning calorimetry and X-ray diffraction analysis. The microstructural and energy characteristics of structural phase transitions have been determined.

APPLICATION OF IMPACT THEORY TO ANALYSIS OF GEAR SHIFTS IN DUAL-CLUTCH TRANSMISSIONS

The article discusses a dynamic model of a transmission containing a dual-clutch gearbox. The absence of a torque converter in such gearboxes, taking into account the short duration of gear shifting (0.2 - 0.5 sec), allows us to present the gear shifting process as an impact. Gear shifting excites the output shaft of the gearbox. Thus, the transmission of the vehicle can beconsidered as a vibro-impact self-oscillating system.

DAMAGE FATIGUE MONITORING OF THE PRIMARY ELEMENT OF STRUCTURE BY EDDY CURRENT AND ACOUSTIC METHODS

The paper presents the results of a study by acoustic and eddy current methods of the fatigue loading process of a power structural element made of austenitic stainless steel. A riveted joint of a plate made of austenitic metastable steel with a stiffener, which is widely used in industry, for example, in the manufacture of vessels, was chosen. During fatigue loading the change in elastic characteristics and the volume fraction of strain-induced martensite was studied in zones close to the rivet hole. The relative number of loading cycles by using an earlier developed technique, based on the ultrasonic and eddy current measurements was calculated. A comparison of the cyclic lifes of the tested power structural element and the plate without a concentrator was caried out