Action Of Vibration Research Articles

Divergent Syntheses of Near-Infrared Light-Activated Molecular Jackhammers for Cancer Cell Eradication.

Aminocyanines incorporating Cy7 and Cy7.5 moieties function as molecular jackhammers (MJH) through vibronic-driven action (VDA). This mechanism, which couples molecular vibrational and electronic modes, results in picosecond-scale concerted stretching of the entire molecule. When cell-associated and activated by near-infrared light, MJH mechanically disrupts cell membranes, causing rapid necrotic cell death. Unlike photodynamic and photothermal therapies, the ultrafast vibrational action of MJH is unhindered by high concentrations of reactive oxygen species scavengers and induces only a minimal temperature increase. Here, the efficient synthesis of a library of MJH is described using a practical approach to access a key intermediate and facilitating the preparation of various Cy7 and Cy7.5 MJH with diverse side chains in moderate to high yields. Photophysical characterization reveals that structural modifications significantly affect molar extinction coefficients and quantum yields while maintaining desirable absorption and emission wavelengths. The most promising compounds, featuring dimethylaminoethyl and dimethylcarbamoyl substitutions, demonstrate up to sevenfold improvement in phototherapeutic index compared to Cy7.5 amine across multiple cancer cell lines. This synthetic strategy provides a valuable platform for developing potent, light-activated therapeutic agents for cancer treatment, with potentially broad applicability across various cancer types.

The state and prospects of improving the hygienic regulation of industrial general vibration

Hygienic rationing is an integral part of national measures in the field of occupational safety and health of workers. The current norms of general industrial vibration, as is known, are not safe. This determines the urgency of improving the system of hygienic rationing of general vibration, which, despite the achievements of science and technology, the emergence of a new controlled vibration parameter — full vibration acceleration, the introduction of a risk-based approach to rationing, has remained virtually unchanged for almost four decades. The study aims to analyze domestic and international approaches to the assessment and normalization of general industrial vibration to justify the transition to a risk-oriented single-digit regulation of full vibration acceleration. The authors carried out an expert and analytical study, analyzed and compared the materials of domestic and foreign regulations, methodological documents and literary sources on various aspects of the problem of rationing general industrial vibration. Scientists have developed a new system for rationing the unfavorable factor of the production environment — general vibration, which establishes an integral standard for complete vibration acceleration, instead of differentiated rationing by vibration sources (transport, transport-technological, man-made) and directions of vibration action along the axes of the basocentric coordinate system (Z, X, Y). The new standard for full vibration acceleration is harmonized with ISO 2631 standard, Directive 2002/44/EC, standards adopted in foreign countries, and, according to calculations, can be approximately 0.56 m/s2 or 115 dB, which requires experimental studies to verify. The new risk-oriented system of rationing of the industrial general vibration will make it possible to objectify the assessment of workers' working conditions and, as a result, streamline and update the examination of the connection of the disease with the profession.

Simulation and Measurement of Strain Waveform under Vibration Using Fiber Bragg Gratings.

The work is devoted to the consideration of methods for determining the strain of objects using fiber Bragg gratings under a high-frequency vibration or pulsed mechanical action, which is difficult to perform using widespread methods and devices. The methods are based on numerical processing of the time dependence of the radiation power reflected from the fiber Bragg grating at various wavelengths, which makes it possible to measure strain parameters in a wide range of magnitude and frequencies. The efficiency of the proposed methods is demonstrated by numerical simulation. It is shown that it is possible to restore the strain dependence on time in the range ±1000 μϵ or more from simultaneously measured power dependencies reflected by the fiber Bragg grating using common fiber-optic components. The case of sequential registration of reflected radiation power at different wavelengths to determine the probability density of the distribution of the strain values is also considered. The results of signal processing obtained both by numerical simulation and experimentally for the case of a linear vibration are presented. The technical problems of using the proposed methods are discussed.

Effect of an Ultrasonic Vibration on the Microstructure and Properties of Al Alloy/Steel Laser Welding-Brazing Joints

This study analyzes the influence of different ultrasonic amplitudes on the microstructure composition, microhardness, tensile strength, and corrosion resistance of Al alloy/steel laser welding-brazing joints assisted by ultrasonic vibration. The application of ultrasonic vibration did not change the microstructure composition of the joints but refined them. The joints were all composed of θ-Fe(Al, Si)3 and τ5-Al7.2Fe1.8Si formed at the interface reaction zone, as well as an α-Al solid solution and Al-Si eutectic phase generated in the weld seam zone. Meanwhile, the thickness of the IMCs at the interface decreased with an increase in the ultrasonic amplitude. When the ultrasonic amplitude was 8 μm, the IMCs thickness was a minimum of 1.62 μm. In this condition, the reduction of the IMCs thickness and the refined grain of joints made the microhardness and tensile strength reach the maximum. The fracture of joints with ultrasonic amplitudes of 0 and 4.8 μm began at the weld seam and extended to the interface reaction zone at the steel side, while the fracture of joints was located in the heat-affected zone (HAZ) of the Al alloy side when the ultrasonic amplitude was 8.0 and 11.2 μm. The fracture mode of the former presented a typical mixed fracture with cleavage steps and tearing edges, and that of the latter showed ductile fracture with uniform and fine ductile dimples. The corrosion resistance of the joints was improved by adding ultrasonic vibration. When the ultrasonic amplitude was 8 μm, its corrosion resistance was optimum; it was ascribed to a dense oxide film formed on the surface of the metal under the action of ultrasonic vibration.

Dynamic Topology Optimization with Multiple Materials Based on Impedance Mismatching of Wave

Topology optimization with multiple materials studies were commonly adopted to address the issues of complex structures and dynamic loading cases. However, the perturbation excited from the transient load will be propagated and change the local stress level in the structure. Therefore, it is indispensable to consider impedance mismatching of waves at the interfaces of multi-materials layers in the optimization model. In this work, the wave impedance will be regarded as constraint conditions and assessment indicators in the optimization design. Firstly, a multi-material interpolation model using SIMP models is established based on the variable density method. Secondly, the optimization process is applied by combining using Newmark-[Formula: see text] method which is used to solve the dynamic response, an adjoint variable method for sensitivity study, and an optimization criterion method employed to update the design variables. Finally, the simulation examples are used to analyze the influence of impedance mismatching and volume fraction for multilayer dielectric on response. The results indicate that the position and content of the Polymethyl Methacrylate (PMMA) plays a key role in reducing vibration and buffering action.

ВЛИЯНИЕ ВИБРАЦИИ НА ИЗНОС БУКСОВОГО ПОДШИПНИКА

The study objective is to determine the effect of vibration on the wear of the parts of a rolling axle box bearing. The tasks of the study are to obtain dependences of the speed and wear intensity of bearing elements depending on time, to determine the most unfavorable factors affecting the bearing, to evaluate methods for increasing wear resistance and vibration resistance of parts of a rolling axle box bearing. The bearing is tested on 1K62 screw-cutting lathe under the action and without the action of axial vibration. Wear is calculated for the treadmill using a mass method, by stopping tests and measuring mass loss (with an accuracy of 1g). The friction path of the roller to determine the wear intensity is calculated analytically. The scientific novelty of the work consists in confirming the hypothesis about the adverse effect of vibration on wear and suggesting methods and ways to increase the vibration resistance of rolling axle box bearing parts. The results of the tests and calculations are presented as graphs showing the effect of vibration on the axle box bearing parts in the form of a wear curve, which has a nonlinear dependence on the test time, as well as a wear curve for tests without vibration. The main factors influencing the fretting wear of rolling axle bearings are determined, methods for increasing their vibration resistance and wear resistance are proposed.

Tubulin Vibration Modes Are in the Subterahertz Range, and Their Electromagnetic Absorption Is Affected by Water.

Many proteins are thought to coordinate distant sites in their structures through a concerted action of global structural vibrations. However, the direct experimental spectroscopic detection of these vibration modes is rather elusive. We used normal-mode analysis to explore the dominant vibration modes of an all-atom model of the tubulin protein and described their characteristics using a large ensemble of tubulin structures. We quantified the frequency range of the normal vibrational modes to be in the subterahertz band, specifically between ∼40 and ∼160 GHz. Adding water layers to the model increases the frequencies of the low-frequency modes and narrows the frequency variations of the modes among the protein ensemble. We also showed how the electromagnetic absorption of tubulin vibration modes is affected by vibrational damping. These results contribute to our understanding of tubulin's vibrational and electromagnetic properties and provide a foundation for future attempts to control protein behavior via external electromagnetic fields.

Assessment of the Compound Damping of a System with Parallelly Coupled Anti-Seismic Devices

(1) Background: Romanian earthquakes caused severe damage over time to a significant number of constructions, and that is why efforts are being made to make structural systems safer. (2) Methods: For structural systems with protection against seismic actions or vibrational actions that have linear viscous dissipation devices, the requirement to assess the equivalent modal damping rate for the entire functional assembly related to the other dynamic parameters arises. (3) Results: This article presents the analytical development of formulas for the compound damping and circular frequency when anti-seismic devices have different dynamic characteristics and their application in order to solve some real engineering cases of bridges and viaducts in Romania with distinct viscoelastic supports. In support of this idea, some experimental tests on a beam system resting on two different anti-seismic elastic supports highlighted the fact that the compound damping of the system can be calculated with the relations established in this paper, provided that the displacements in the horizontal direction of excitation are in the linear domain. Also, we determined the seismic response considering the Vrancea 1977 accelerogram for critical damping ratios of 5% and 18.5%, and then we obtained the variation in the factor of transmissibility depending on the frequency, in order to highlight the optimized value of the equivalent amortization/damping. (4) Conclusions: In the specific context of Romanian seismicity, seismic isolation through the use of isolators with different characteristics represents an optimal technical solution, and it is also optimal from an economic point of view, with an appropriate level of dynamic isolation obtained.

Interface strengthening mechanism of TZM/Q235 joint by ultrasonic-assisted electron beam welding with high entropy alloy interlayer

The high-strength joints of TZM/CoCrFeNiMo0.2/Q235 were realized by ultrasonic-assisted electron beam welding. The effects of ultrasonic vibration on the microstructure evolution and mechanical properties of the reaction layers were analyzed. A reaction layer with a thickness of >10 μm was observed at the TZM side region. The reaction layer was characterized by columnar Fe2Mo phases growing perpendicular to the fusion line and FCC solid solutions with different grain orientations. Under the action of ultrasonic vibration, the eutectic structure of Fe2Mo phases and FCC solid solutions was evenly distributed in the reaction layer, and the grain orientation of the FCC solid solutions in the reaction layer changed to be the same as that in the fusion zone. Compared with the joint without ultrasonic vibration, the difference of nanoindentation hardness between the Fe2Mo phases and FCC solid solutions and the residual stress inside the reaction layer of the welding joint with an ultrasonic power of 80 W were significantly reduced. The maximum tensile strength of the joints was 318.4 ± 26 MPa, which was 18.9% higher than that of the joint without ultrasonic vibration.

Psychological research in vibration disease: level of alexithymia, psychological defenses

Vibration disease ranks among the first in the structure of diseases in workers at mechanical engineering enterprises, metallurgical, mining, and construction industries, various branches of agriculture, and aircraft manufacturing. A change in the mental status of people working in vibration conditions was identified; the most common are «neurosislike states» with psycho-emotional disorders of anxiety type. Meanwhile, currently existing data on the state of the nervous system in vibration pathology are contradictory and scarce, which requires a more in-depth study. Purpose of the study: to investigate the psychological status of patients with vibration disease from the action of both local and general vibration. Research results. In patients with vibration disease from the action of both local and general vibration, a predominance of destructive psychological defenses (projection and repression) over constructive ones (compensation and rationalization) is observed.

Причины трещинообразования и признаки деформации угольного пласта в зоне вибрационного воздействия

The use of vibration effects for the effective preparation of a low–permeability coal seam is a fairly promising and constantly improving process. The main difficulty of theoretical research is the fact that coal seams are very diverse in their properties and represent a complex environment. Under the influence of vibration, the capacitive and filtration characteristics of the coal massif change. This leads to a change in the structure and capacity of the porous-fissured space of coal. This reaction finds a good explanation: each act of vibration action causes a rapid change in the coal mass in accordance with the operating stresses during vibration. This point of view was used as the basis for theoretical reasoning, in order to justify the rational impact of directional vibration on the coal seam, to change fracturing and further intensify methane recovery. This is confirmed by both laboratory and industrial experiments on vibration effects. Changes in the environment after strong earthquakes are of a similar nature, even at great distances from the source of the impact. Therefore, the simplest in terms of constructive implementation and less costly in terms of energy and material consumption is a directed oscillatory process on a low-permeability coal seam, which is performed using vibration installations of both surface and underground design.

Максвеллівська релаксація і внутрішнє тертя в системі полівінілбутираль-полівінілхлорид

The Maxwellian relaxation and internal friction of a mixture of amorphous polymers: polyvinyl butyral (PVB) - polyvinyl chloride (PVC) are studied. It has been found that by changing the temperature (T) and content (j ) of the ingredients, it is possible to control the value of viscoelastic moduli, viscosity, damping force, and energy dissipation due to Maxwellian relaxation caused by the action of ultrasonic vibrations with a frequency (w ) of 0.4 MHz on the composite. The use of computational methods, models, and a phenomenological approach made it possible to differentiate the effects of relaxation and indicate the ways to optimally combine the desired properties of the components in the system.

Application of acoustic oscillations for accelerating the leaching process of saline soils

The escalating expansion of saline soils in arid and semi-arid regions presents a significant challenge to agricultural sustainability. In light of the widespread water scarcity, there has been a growing demand for innovative technologies aimed reducing water during the leaching of saline soils. This study explores the application of acoustic vibrations, particularly utilizing a seismic vibrator SV 10/100, to improve the efficiency of soil desalination. The mechanism of action of acoustic vibrations is explained by the formation of a vortex flow around soil particles oscillating within a defined amplitude and frequency range, thereby enhancing the dissolution of salts. This study specifically targets soda solonetz-solonchak soils with diverse mechanical compositions, situated in the Ararat plain of Armenia. Field experiments utilizing the lysimetric method were conducted in 2016. The primary aim was to determine optimal parameters of acoustic oscillations to expedite desalination process while assessing their impact on soil physical properties during leaching. Findings revealed that higher oscillation amplitudes (ranging from 4 to 7 mm) at frequencies of 10–70 Hz, within a 100-meter radius or 3.14-hectare area were watched. Specifically, oscillations at frequencies of 30–50 Hz for 1.0–1.5 h per leaching water portion (2500 m3/ha) effectively reduced the required leaching water volume and duration by 2 times when applied during soil leaching following acidification. It is important to note that the soil properties after leaching remained in the optimal ranges for the region (soil density 1.2–1.3 g/cm3, hydraulic conductivity 10–20 cm/day). Overall, this research underscores the efficacy of acoustic oscillations in expediting reclamation processes, reducing leaching water requirements, enhancing soil fertility, and facilitating integration into agricultural cycle. Therefore, the newly proposed method of utilizing acoustic vibrations shows potential for efficiently leaching saline soils.

Determining the effect of vibrating wave swabbing on the functional processes in carbonate low-permeability reservoirs

This paper investigates the method of vibrating wave swabbing, which is used to stimulate the flow of liquid to the well. This method is known to generate mechanical waves in the soil that open microcracks and pores, increasing the flow of hydrocarbons. A carbonate reservoir with low permeability, which is quite common in the oil and gas industry, was considered as the study object. Therefore, the object of research was carbonate low-permeability reservoirs. After all, their low permeability makes the extraction of oil and gas from them a difficult task. As a result of processing, it was established that increasing the amplitude of pressure fluctuations contributes to increasing the efficiency of the vibration wave action, as the permeability of the reservoir increases more intensively, which was confirmed by the coefficient of determination, which was R2=0.92. And an increase in the frequency of oscillations, on the contrary, reduces it, because the depth of the effective zone of vibrational action decreases; in this case, the coefficient of determination was R2=0.81. To study the effect, a laboratory setup was designed that included a plunger device that generated fluid perturbations in a conditional borehole. The resulting elastic waves were measured by a manual contact vibrometer. Vibrating wave swabbing is a promising method for intensifying hydrocarbon production. The influence under investigation could be implemented in oil and gas fields with carbonate low-permeability reservoirs. This would lead to an increase in fluid production and improved efficiency of the oil and gas industry

Features of immunopathogenesis, prognosis and quality of life in vibration disease and its combination with bone and joint disorders

The article describes the features of working conditions, the clinical picture, the state of the immune profile, cytokine regulation in vibration disease from the effects of local vibration with its combined forms with deforming osteoarthritis in the assembly riveters of an aircraft manufacturing enterprise. Objective: to identify the clinical and pathogenetic features and quality of life in vibration disease from the effects of local vibration with its combined forms with deforming osteoarthritis. The level of C-reactive protein and rheumatoid factor was studied by the solid-phase enzyme immunoassay (ELISA). Immune disorders in vibration disease and its combined course with ostearthritis were investigated by methods including the determination of CD4+, CD8+ lymphocyte subpopulations. To assess the cytokine status, the content of interleukins 1‑beta (IL-1β), 4 (IL-4), 8 (IL-8) in blood serum was analyzed. The study of the quality of life was conducted using the SF-36 questionnaire. The calculation of the statistical significance of the differences was carried out according to the Mann-Whitney criterion. The prognostic value of changes in the immune profile and cytokine regulation in vibration disease from the effects of local vibration with its combined forms with deforming osteoarthritis has been established. In case of vibration disease from the action of local vibration and its combination with deforming osteoarthritis, clinical and pathogenetic changes are characterized by a significant decrease in the levels of CD4+, CD8+ lymphocyte subpopulations, an increase in serum concentrations of IL-1β, IL-8. Taking into account the fact that the development and manifestation of symptoms of vibration disease from exposure to local vibration, including comorbid conditions (which include deforming osteoarthritis) manifests itself later than changes in the immune status are recorded, the creation of dynamic monitoring of the health status of persons in contact with industrial vibration is of great practical importance. The prognostic value of determining the quality of life in vibration disease from the effects of local vibration and its combined forms with deforming osteoarthritis has also been established.

APPLICATION OF VISCOELASTIC SYSTEMS IN OIL PRODUCTION INTENSIFICATION PROCESSES

This paper provides an overview of viscoelastic behavior and the use of viscoelastic fluids (VBLs) in various oil production intensification processes. The first part provides basic models describing viscoelastic behavior and corresponding equations of state. Describes the method of testing under the action of harmonic vibrations (method of dynamic tests), possible options for its implementation and the determined rheological properties of the viscoelastic sample. To interpret the results of dynamic tests, a complex module is most often introduced, which consists of two components — the elastic modulus (G’) and the loss modulus (G’’). These dynamic modules and their relationship describe the behavior of the viscoelastic sample. It is shown that with respect to modules, it is possible to conclude on the type of sample - viscoelastic liquid or viscoelastic body. It is also noted that dynamic tests should be carried out in the area of low amplitudes of oscillating loads, in which the rheological properties do not depend on the applied stress or strain. The second part provides examples of viscoelastic systems used in operations such as water flow isolation, hydraulic fracturing, and modified acid treatments. The most common viscoelastic systems used in various technologies are solutions of surfactants and polymers of different structures. It is noted that in order to obtain a viscoelastic gel, polymer solutions are used with a crosslinker, while the rheological properties of surfactant solutions are controlled by external factors — pH, temperature, water mineralization. Viscoelastic surfactant solutions have an advantage over polymer solutions ‑ they are able to recover their properties after mechanical or thermal exposure due to the formation of supramolecular structures as a result of selforganization of surfactant molecules. The surfactant-based HLT property of reversibly collapsing and recovering is used, in particular, to reduce pressure losses to overcome friction. In flow-deflecting acid compositions, viscoelastic surfactants are mainly used, the most common of which are given in the second part of the article.

Superhydrophobic NiTi shape memory alloy arrays with switchable controlled anisotropic droplet sliding

Smart microstructured surfaces have attracted extensive attention in recent years, because the surface microstructure morphology can be tuned using an external field to change the wettability. Inspired by the surface microstructures of butterfly wings, a tilted array microstructure was fabricated on the surface of NiTi shape memory alloy (NiTi-SMA) using wire electrical discharge machining (WEDM). The modified surface with fluorosilane showed superhydrophobicity and anisotropic droplet sliding. As the shape of the tilted microarray structure could be repeatedly switched between the original shape and deformation under the action of force and heat, the contact angle of the surface was repeatedly switched between 155.9° ± 0.2° and 150.3° ± 0.3°, and the anisotropic sliding angle of the surface was repeatedly switched between 7.9° ± 1.6° and 22.9° ± 1.3°, and 19.6° ± 0.6° and 53.4° ± 2.9°. The range of switchable anisotropic sliding could be adjusted by changing the microstructure spacing L. In addition, the surface of the tilted microarray structure showed a directional water transport ability under the action of vibrations, and the directional transmission of water droplets could be selectively controlled by changing the morphology of the surface microstructure. Therefore, a smart surface with switchable wettability was realized on the NiTi-SMA surface, providing a new method to realize the smart control of droplets on smart microstructured surfaces.

A quasi-classical study in a quantum spirit of mode specificity of the H + HOD abstraction reaction.

Quantum benchmark calculations of the H + HOD abstraction reaction [B. Zhao et al., Phys. Chem. Chem. Phys., 2018, 20, 17029-17037] provide an opportunity to test approximate methods, such as quasi-classical trajectories (QCTs) with Gaussian binning. However, the large mode-specific enhancements of this reaction lead to special challenges and unphysical QCT cross-section artifacts. We propose and apply a general backward-forward-backward (BFB) trajectory procedure to avoid cross-section artifacts arising from vibrational motion delocalization of the initially prepared reactants. We also develop and apply a general hybrid weighting scheme, in which vibrationally adiabatic products receive unit weights, while vibrationally non-adiabatic products are Gaussian weighted. Motivated by examination of the product vibrational actions, the hybrid weighting is necessary to avoid large cross-section errors. These QCTs with Gaussian weighting extensions are general and are recommended for future polyatomic reaction simulations.

APPLICATION OF THE VIBROPNEUMATIC SEPARATOR IN THE CLEANING AND PREPARATION SECTION OF THE CEREALS PROCESSING COMPANY

The development and introduction in the milling industry of new vibrating machines for separating and drying solid particles contributes to the intensification of this difficult technological process. The vibration action allows considerably improving the kinematic parameters – increasing the acceleration and frequency of the working body, reducing the amplitude of the oscillation of the working body compared to existing machines. Cleaning the batch of grains from impurities, sorting their derived products, as well as partially reducing humidity, represent the set of operations, which are carried out with the aim of increasing the quality of the grains in the batch and the derived products. Simultaneously with the removal of impurities, cleaning reduces the volume of products that must be handled, transported and stored, as well as the removal of 1-2% of moisture along the way. In the case of wheat intended for consumption, it is aimed to eliminate impurities as much as possible, which have no food value. The modernized vibropneumatic separator intended for the processing of cereal products, contains a body, mounted on a drum, with a hermetically fixed cover, in which a telescopic connection is placed for cutting the wet product. A working organ is located inside the body, made in the form of a conical sieve with the tip up. The conical sieve is rigidly connected with a vibrating mechanism, and with the bat - by means of elastic elements. Under the action of the vibrating mechanism, the working organ performs a complex spatial movement. Ducts for exhausting the air flow are installed on the circumference of the cover. An inner cone and an outer cone are placed one inside the other under the conical sieve. The device also contains connections for the discharge of the sifted fractions and refuse.

MATHEMATICAL MODELING OF THE PROCESS OF MOVEMENT OF GRAIN MATERIAL ON THE SURFACE OF A SIEVE OF A VIBRATING PNEUMATIC PULSE SEPARATOR

The results of a theoretical study of the movement of grain material on the surface of a unfailing sieve of a vibrating pulse separator are presented. The paper presents the power and kinematic model, geometric characteristics of the surface of the sieve of a vibrating pneumatic pulse separator in static, and kinematic processing parameters. Calculations based on the proposed model allow determining the forces of movement, velocity, and acceleration of seeds in the grain medium under the combined action of vibrations and pneumatic pulse flow. The following conclusions were drawn as a result of the research and analysis of the generated forces according to the developed mathematical model: the greatest influence on the process of moving grain material, both in the horizontal and vertical directions, is exerted by the force of impulse (pulsation) of the air flow, the pressure force above the overlying layers of grain material (for seeds in the middle part and on the surface of the sieve without a dip), friction forces, seed weight, and the Archimedean force; in order to intensify the process of fractionation of the grain medium, increase the productivity of the vibrating pneumatic pulse separator, it is necessary to increase the force of the pulsating air flow, the inertia of the oscillatory motion, friction and lateral pressure on the seeds in the grain medium. To solve this problem, it is necessary to optimize the amplitudes and frequencies of oscillations of the unfailing sieve of the vibrating pneumatic pulse separator. The analysis of the mathematical model showed the feasibility of using a vibrating unfailing sieve surface with the simultaneous interaction of the injecting pulsating air flow under the sieve to separate grain material by seed density. It has been established that in order to intensify the separation of grain material into fractions, while increasing the productivity of the technical means, it is necessary to increase the force of the pulsating air flow, friction forces, and lateral pressure. The dynamic model of the movement of grain material displacement and recombination is scientifically substantiated and technological recommendations for the separation of grain material into fractions by seed density using the proposed technical means of a vibrating pneumatic pulse separator with the use of a patented method of its separation are developed.