Vibroengineering Procedia: Table of Contents

Seismic performance and deformation characteristics of low-rise SIP panel timber buildings

Kosbergenov, Nurpolat — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 217-223.
Nurpolat Kosbergenov, Sobirjon Razzakov, Abdurasul Martazaev, Amanbay Arziev, Dauranbek Toreshov, Aybek Alimbaev, Raushan Madiyarova
This article discusses the seismic resistance of the two-story structure constructed from wooden SIP panels, which are commonly used in low-rise structures. In the research process, the behavior of the building under seismic influences was comprehensively analyzed based on theoretical calculations and digital modeling performed using the ETABS software package. In particular, the values of horizontal displacements along the floors of the building were determined, and the results of theoretical calculations were compared with the results obtained in the ETABS program. In addition, the stress–strain state of the building structures was determined, and deformations arising under seismic loads, internal forces, and the laws of their distribution were assessed. The obtained results show that wooden buildings with SIP panels are sufficiently deformable and energy-absorbing in relation to seismic impacts. The convergence of the results of theoretical and numerical calculations confirms the reliability of the chosen computational models and accepted assumptions.

Stress-strain behavior of rail fastenings in railway turnouts

Bondarenko, Aleksey — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 710-716.
Aleksey Bondarenko, Kuvandik Lesov, Talgat Salakhov, Ding Haibo, Mukhamedali Kenjaliyev, Murat Alimkulov
This paper investigates the stress-strain behavior of rail fastening systems in railway turnouts subjected to non-uniform stiffness distribution and cyclic axial wheel loading. Unlike conventional track sections, turnout fastening units exhibit structural asymmetry and complex load transfer mechanisms that significantly influence stress evolution and deformation response. A three-dimensional finite element model was developed to analyze the behavior of switch slide chairs under loading applied separately to the stock rail and the switch rail. The analysis determined maximum deflections of 4 and 5 mm for the stock-rail and switch-rail loading cases, respectively, and identified critical stress states from +200 to –433 MPa that may contribute to fatigue-related damage under repeated service conditions. The results demonstrate that under-rail pad stiffness substantially affects stress redistribution and the durability of fastening nodes. Based on these findings, recommendations are proposed for refining stiffness parameters to enhance the reliability and service life of railway turnouts.

Some issues of forecasting crack formation on automobile roads

Mamatkulov, Muzaffar — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 318-324.
Muzaffar Mamatkulov, Shaxnoza Xalimova
Forecasting the occurrence of cracks in asphalt-concrete highway pavements worldwide - while considering natural and climatic influences - is essential for ensuring high-quality road maintenance, preserving pavement value at standard levels, guaranteeing traffic safety, and improving both transportation services and overall societal mobility. In this context, special emphasis is placed on identifying the underlying causes of crack formation, predicting their development over time, and assessing how these defects affect the functional performance of the roadway and the load-bearing capacity of the pavement structure. This includes evaluating the consequences of cracks on user comfort and safety, determining effective methods for their mitigation, and establishing a comprehensive database of crack characteristics.

Mathematical modeling of controlled vibration mechanisms

Karimov, K. A. — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 65-74.
K. A. Karimov, A. Kh Akhmedov
The article presents the results of the development and improvement of the theoretical foundations of mathematical modeling of controlled vibration mechanisms of the following three types: a scanner, a reversible mechanism, and mechanisms based on external physical fields – the electrorheological and magnetorheological effects. An analysis and generalization of existing studies and designs of vibration systems with controlled parameters and kinematic relations are carried out, and an updated classification of control methods is proposed. A unified mathematical model is formulated based on the principles of precision vibromechanics and modern vibration theory. Numerical calculations and qualitative analysis of the differential equations were performed using modern computational methods. The reliability of the results is confirmed by experimental tests of a new vibration mechanism design, demonstrating improved dynamic accuracy and control efficiency.

Propagation of three-dimensional boundary waves in thin viscoelastic cylindrical shells

Usmanov, Botir — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 616-623.
Botir Usmanov, Ismoil Safarov, Bekzod Mirzakabilov, Tulkin Ruziyev, Nozimbek Shomurodov, Sherzodjon Ablokulov
This paper examines the propagation of three-dimensional boundary waves in an infinite, thin, viscoelastic cylindrical shell. The governing equations are formulated using the three-dimensional theory of viscoelasticity in cylindrical coordinates. The problem is reduced to an eigenvalue problem using separation of variables and potential functions. A numerical solution is obtained using the Muller method, and dispersion relations are analyzed. The influence of viscoelastic parameters on natural frequencies is studied. The results indicate that material viscosity has a significant impact on wave attenuation and frequency characteristics. Comparisons with the classical Kirchhoff-Love theory demonstrate good agreement at low wave numbers, while deviations increase at higher frequencies.

Impact behavior of self-compacting basalt fiber-reinforced concrete with a zeolite-quartz composite binder

Makhamataliev, Irkin — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 461-467.
Irkin Makhamataliev, V. M. Soy, Nemat Muhammadiev, Azamat Khudoyorov, Sherbek Uzakov, Artanti Lintang
This article presents the results of experimental studies to investigate and evaluate, in accordance with standard requirements, the impact strength of developed self-compacting basalt fiber concrete compositions. The research demonstrated that replacing the cement binder with a composite consisting of Portland cement, zeolite-containing rock, and quartz sand can produce highly effective self-compacting basalt fiber concrete mixtures. Experimental studies have shown that even after initial cracks have formed, basalt fiber concrete samples are capable of withstanding increased impact loads. This indicates that the developed self-compacting basalt fiber concrete, as a composite material with very high impact strength, can be recommended for the construction of highly critical protective structures.

Stability of embankment slopes in sandy soils reinforced with geosynthetic materials

Lesov, Kuvandik — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 209-216.
Kuvandik Lesov, Sherzod Tadjibaev, Rongshan Yang, Mukhamedali Kenjaliyev, Ulugbek Ergashev, Nodir Begmatov
This article examines the design of earthworks to improve the stability of embankment slopes in sandy soils reinforced with geosynthetic materials. Ensuring the stability and strength of the earth bed in sandy soils is particularly relevant under increasing train speeds and growing linear and axial loads on existing and newly constructed railway lines. A design solution for an embankment in sandy soils reinforced with geosynthetics is proposed based on calculations of the slope stability coefficient. Calculation schemes for determining additional restraining forces and slope stability when using volumetric geogrid and geotextile are presented. The increase in the stability coefficient is achieved through additional restraining forces provided by the geotextile and each i-th cell of the volumetric geogrid. It has been established that reinforcement of sandy embankment slopes with geosynthetic materials increases the retention force T-hold by 18-25 % due to additional design parameters, while the stability coefficient rises by 14-23 %, ensuring the required condition K≥ 1.2.

Modeling of a perforated plate with hysteresis type characteristics under kinematic excitations

Khodjabekov, Muradjon — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 51-57.
Muradjon Khodjabekov, Azamat Otaqulov
In this study, the energy expressions of a perforated plate with hysteresis-type elastic-dissipative characteristics subjected to kinematic excitations are determined, and based on them, the differential equation of motion is formulated using the second-order Lagrange equation. The dissipative properties of the plate material are described using the expressions derived from the Pisarenko-Boginich hypothesis, and are incorporated through coefficients in explicit form by means of the harmonic linearization method. The cut-out extracted from the rectangular plate is also assumed to be rectangular in shape, with its sides parallel to those of the plate, and its location considered arbitrary within the plate domain. The kinetic and potential energies are expressed separately for the plate and the corresponding cut-out region, and, based on the equality of displacements along the cut-out boundary, the necessary compatibility relations are established. As a result, both the kinetic and potential energies are ultimately expressed solely in terms of the plate deflection. The mode shapes of the perforated plate are assumed to be orthogonal, and by applying the Bubnov-Galerkin method, the governing differential equation of motion is reduced to a simplified form.

Mechanical and moisture performance of asphalt concrete containing polyurethane-coated basalt fiber and recycled polyethylene

Salokhiddin, Kurbonov — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 530-536.
Kurbonov Salokhiddin, Malikov Ganisher
The invention relates to the development and application of a polymer additive for asphalt concrete mixtures aimed at enhancing the mechanical and durability properties of road pavements. The study introduces a composite additive consisting of polyurethane-coated modified basalt fiber (38.0–42.0 wt.%) and recycled polyethylene (rPE) (58.0-62.0 wt.%). The additive can be incorporated into dense-graded or stone-mastic asphalt concrete at controlled dosages, ensuring uniform distribution throughout the mixture. Laboratory tests have demonstrated that asphalt concrete containing the polymer additive exhibits higher stability, improved tensile strength, and reduced water susceptibility compared to conventional mixtures. The additive also contributes to the environmental sustainability of road construction by enabling the partial use of recycled asphalt pavement (RAP) materials without compromising performance. The method of preparation involves precise heating, blending, and homogenization steps to maintain the optimal physical properties of the polymer, ensuring compatibility with the bitumen matrix. This innovation is particularly suitable for regions experiencing extreme temperature fluctuations and heavy traffic loads, providing longer pavement service life and reducing maintenance costs. The polymer additive can be adapted for various asphalt mix designs and construction technologies, offering flexibility for both new road construction and rehabilitation projects. Overall, the use of this polymer additive in asphalt concrete mixtures represents a significant advancement in pavement engineering, combining improved structural performance, economic efficiency, and environmental benefits. The additive is compatible with existing asphalt production facilities and can be easily integrated into standard asphalt mixing processes, promoting widespread adoption in modern road construction practices.

Simulation of pore evolution under laser remelting in SLM process

Miao, Yanping — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 690-695.
Yanping Miao, Zhiwen Li, Hui Lei
In the process of selective laser melting (SLM) forming, pore defects can seriously affect the quality of formed parts. In this paper, the effectiveness of laser remelting to eliminate the pore defects of SLM formed parts was analyzed experimentally. Based on the level set method, a numerical simulation of multi-physics finite element model was established to analyze the mechanism of pore evolution during laser remelting. It is found that the pore evolution is significantly affected by the Marangoni effect at the micro scale. Affected by the Marangoni effect, during the evolution process, the porosity doesn't rise vertically. Instead, it moves towards the tail area of the molten pool while rising. The essence of pore evolution is fluid mass transfer. Moreover, the effectiveness of laser remelting in eliminating porosity has been verified through experiments.

Vibro-mechanical energy modeling of limestone screenings grinding for transport materials

Rustemov, Ilyas — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 363-368.
Ilyas Rustemov, Darkhan Yelemes, Arlan Kazhetayev, Bakhytzhan Abiyev, Mussin Kydyrzhan, Rashidbek Hudaykulov, Barno Salimova, Feruza Ikramova, Dilshod Aralov
Limestone screenings generated during crushed stone production account for up to 25 % of processed raw material and are typically classified as low-value by-products despite their high CaCO3 content and favorable particle size distribution. This study develops a vibro-mechanical energy model for the grinding-based processing of limestone screenings into mineral powder, limestone flour, and microfiller for transport applications. The model integrates fraction distribution analysis, total energy balance, dynamic grinding effects, logarithmic strength prediction, and CO₂ emission assessment within a unified analytical framework. Grinding is interpreted as a vibro-mechanical process governed by impact and cyclic loading mechanisms affecting particle fragmentation efficiency. The proposed processing scheme reduces specific energy consumption from 120-130 kWh/t to 92-95 kWh/t (25-30 % reduction). Strength development of cement composites, described by a logarithmic function of specific surface area, shows a 12-15 % increase at 6000-7000 cm2/g. The associated CO₂ emission reduction reaches 30.3 kg per ton of processed material. The model provides a predictive engineering tool for optimizing vibro-mechanical grinding systems in sustainable transport material production

Experimental evaluation of basalt fiber micro-reinforcement on strength and crack resistance of fine-grained concrete for pavements

Amirov, Tursoat — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 369-374.
Tursoat Amirov, Sukhrob Rakhmatov, Majidbek Jumogulov, Bobomurod Qurbonov
This study investigates the enhancement of mechanical properties of fine-grained concrete reinforced with basalt fibers for road pavement applications. Basalt fibers were incorporated into the concrete mixture at dosages of 0.5 %, 1.0 %, and 1.5 % by weight of cement to achieve micro-reinforcement of cement-concrete pavements. Experimental results were obtained by evaluating the compressive strength and flexural tensile strength of prepared specimens. The findings indicate that the inclusion of basalt fibers contributes to improved structural integrity of the cement matrix by limiting the formation and propagation of microcracks and macrocracks. Based on the experimental analysis, practical recommendations are proposed for optimizing the fiber content to ensure uniform distribution and formation of a dense and durable cementitious structure.

Efficiency of types of reinforcement systems for existing foundations (footings and piles)

Lee, Kwangyeol — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 113-119.
Kwangyeol Lee, Askar Zhussupbekov, Abdulaziz Gulamov, Said Shaumarov, Miraziz Talipov, Daulet Khadim
Construction near existing structures can induce ground movements that compromise foundation performance, including excessive settlements and loss of bearing capacity. This study evaluates reinforcement strategies for deteriorated shallow footings and pile foundations under combined vertical and lateral loads. Reinforcement is achieved by transferring loads to deeper, more stable soil strata. A finite element analysis simulated soil-structure interaction and assessed total and differential displacements. Cylindrical Type Sheet Piles (CTSP) were installed at varying depths and inclinations, and compared with Deep Cement Mixing (DCM). For footing foundations, CTSP installation reduced horizontal displacement by 72-80% and vertical settlement by 96-98 %. Additional reinforcement using H-beams and inclined CTSP slightly varied reduction, with horizontal displacement decreasing 22-72 % and vertical settlement 23-96 %. For pile foundations, CTSP reduced horizontal displacement by 93-95 % and vertical settlement by 97 %, while DCM provided an economical alternative with 81 % and 86 % reduction, respectively. Increasing CTSP embedment depth from 10 m to 20 m further minimized displacement, particularly in pile foundations. These results provide quantitative guidance for selecting optimal reinforcement systems to enhance stability and performance of existing foundations under complex geotechnical conditions.

Seismic performance of railway track structures with reduced dynamic stiffness in weak and complex soil conditions

Abdujabarov, Abdukhamit — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 120-125.
Abdukhamit Abdujabarov, Mashkhurbek Mekhmonov, Maqsudjon Khamidov, Farkhod Eshonov, Auyezmurat Yembergenov
As analyzed by the article, the damage of the railway’s structures by even comparatively weak earthquakes with the magnitude of 5-6 may lead to severe destruction in situations of complicated relief and weak soil. The equation that can be used to find the force of the existing seismic impact includes the active seismic isolation coefficient that has been experimentally established in different soils. According to the outcome of the research, the degree of damping of vibration in water and loose soil layers were determined. The feasibility of minimizing the track dynamic stiffness through prestressed sleepers and fluoroplastic gaskets to the track passing through the galleries have also proved true. The solutions put forward permit a decrease in the mass of reinforcement on the supports of bridges, and on embankments of large height, for excavation of reinforced concrete piles and spacing them further apart. Consequently, the reliability enhancement and economic efficiency of the structures are being increased.

Nanoscale size criterion for modifier selection in polymer composites for vibration damping

Antonov, Alexander — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 381-386.
Alexander Antonov, Murodjon Rakhmatov, Khurshidbek Nurmetov, Alimjon Riskulov, Vasily Struk, Kazimir Znosko
This study establishes quantitative criteria for evaluating the transition of dispersed particles to a nano-state in polymer composite systems. We demonstrate that the critical nanoparticle size L0= 230θD–1/2 [nm], where θD is the Debye temperature, provides an adequate assessment of nanoscale characteristics across diverse material classes including metals, halides, and AIIIBV/AIIBVI semiconductors. Experimental validation through thermally stimulated current spectroscopy and electron paramagnetic resonance reveals that particles below this dimensional threshold exhibit fundamentally different energy parameters, characterized by uncompensated charge states with extended relaxation times. Morphological analysis confirms that technological treatments – thermal (373-473 K), laser (λ0= 1.06 μm, 2×10–6 s pulse), and mechanochemical activation – substantially modify surface layer morphology, increasing the content of nanoscale constituents. The proposed dimensional criterion enables rational selection of modifiers for polymer-based composite materials with applications in vibration-damping components for automotive engineering. The validity of the proposed criterion is further confirmed by the analysis of thermal transport mechanisms in the formed interfacial layers. It is demonstrated that particles meeting the L0threshold promote the development of a three-dimensional physical bond network at the polymer-filler interface. This interfacial structuring not only enhances thermal conductivity but also facilitates the formation of viscoelastic layers with optimized mechanical energy dissipation (tanδ= 0.1-0.3), which is essential for vibration-damping components in mechanical systems.

Parametric vibrations of a clamped reinforced viscoelastic composite plate

Eshmatov, Bakhtiyor — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 34-40.
Bakhtiyor Eshmatov, Mirziyod Mirsaidov, Abdurahmon Rayimov, Zulaykho Eshmatova
The study focuses on the nonlinear dynamic behavior of an anisotropic fiber-reinforced viscoelastic rectangular plate made of fiberglass with fully clamped edges, subjected to a parametric load applied along one of its sides. The mathematical formulation describing the plate’s dynamic response is developed within the framework of the generalized Timoshenko plate theory, which accounts for transverse shear deformation as well as rotary inertia effects. To incorporate the viscoelastic nature of the material, the integral representation of the Boltzmann-Volterra hereditary theory is employed, allowing the time-dependent stress relaxation of the material to be taken into account. A parametric analysis is performed to investigate how the geometric characteristics of the plate and the viscoelastic properties of the composite material influence its dynamic response. The obtained results may be useful for the design and analysis of composite structural elements operating under dynamic and parametric loading conditions. The considered problem is directly related to vibration analysis and dynamic stability of engineering structures, which is within the scope of vibroengineering applications.

Assessment of vehicle-induced acoustic and vibrational impacts on the human body

Ergashev, Qahramon Xushvaktovich — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 252-260.
Qahramon Xushvaktovich Ergashev, Reyhan Akbarli
Environmental noise and mechanical vibrations generated during vehicle operation represent important factors influencing passenger comfort and human health. With the rapid development of modern transport systems and the increasing time individuals spend in vehicle environments, the assessment of acoustic and vibrational conditions inside vehicle cabins has become an essential research topic in transport engineering. Prolonged exposure to elevated levels of noise and vibration may lead to physiological and psychological discomfort, reduced concentration, fatigue, and other adverse effects on the human body. The present study investigates the acoustic and vibrational characteristics occurring inside vehicles and evaluates their combined influence on passengers. An experimental analysis was carried out on a passenger bus of category M3, with a capacity of 51+1 seats. Measurements of interior noise levels were performed under stationary and dynamic operating conditions using a Class 1 sound level meter with A-weighting and specialized data acquisition software. The experimental results demonstrated that the average interior noise levels were 44.81 dB(A) at 600 rpm, 55.34 dB(A) at 1500 rpm, and 57.05 dB(A) at 2000 rpm, while the measured noise level during vehicle motion at 45 km/h reached 56.51 dB(A). The obtained results indicate that variations in operating conditions significantly influence the acoustic environment inside the passenger compartment. Based on the analysis of experimental data and existing scientific literature, a comprehensive evaluation of the combined effects of noise and vibration on the human body was conducted using the concept of cumulative exposure or “pollution dose”. Furthermore, the study discusses engineering approaches and technical solutions aimed at reducing acoustic and vibrational loads in vehicle cabins. The findings of this research contribute to a better understanding of noise and vibration interactions in vehicle environments and may serve as a basis for the development of effective strategies to improve passenger comfort and reduce harmful acoustic and vibrational exposure in modern transport systems.

Interfacial layer formation and thermal transport mechanisms in polymer nanocomposites for vibration-damping applications

Antonov, Alexander — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 387-395.
Alexander Antonov, Khurshidbek Nurmetov, Alimjon Riskulov, Vasily Struk, Alexander Nikitin, Ziarat Pashayeva
This study investigates the mechanisms of interfacial layer formation in polymer nanocomposites and their influence on thermal transport properties. Experimental evaluation of epoxy composites modified with Al2O3 and SiO2 particles of varying dispersity demonstrates that reduced modifier size leads to increased effective thermal conductivity, attributed to the formation of three-dimensional physical bond networks between matrix and nanoparticles. A finite-difference numerical model incorporating interfacial thermal resistance (Kapitza resistance) was developed to calculate temperature fields and effective thermal conductivity. Model validation against experimental data yields interfacial layer thicknesses of 6.75 nm for Al2O3-filled composites at 0.312 volume fraction. The structuring influence of nanoscale modifiers promotes formation of physical and chemical bonds at the interface, enhancing thermal conductivity of the boundary layer. These mechanisms enable targeted control of polymer nanocomposite properties for vibration-damping components requiring simultaneous thermal management and mechanical energy dissipation in automotive and mechanical engineering applications.

Methodology for measuring dynamic response of railway track components at rail joints

Mekhmonov, Mashkhurbek — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 261-266.
Mashkhurbek Mekhmonov, Maqsudjon Khamidov, Farkhod Eshonov, Mavjuda Mirkhanova, Jamshidbek Yuldashaliyev
The reasons of failures, dynamic loads, vibrations and residual deformations occurring at the zone of rail joints of the railway track operating in the conditions of Uzbekistan and possibilities of their mitigation are scientifically and practically studied in the given article. It has already been proved that when the speed of the train is great and the loading high, the dependability of the components of the track superstructure of the railway track is decreased, particularly, in the area of railway joints, the geometry violations, transverse displacements and longitudinal ones, and the destruction of crushed stone of the prism of ballast are increased exponentially. Being the object of the research, were laid on an experimental station chosen on a segment of JSC “Uzbekistan Railways” on the basis of a regular train service. The potential of decreasing the vertical stiffness and enhancing the dispersion of the downward force by adding the use of elastic substrates beneath the sleepers in the area of rail joints has been examined. Experimental measurements were conducted at 2 measurement points in order to determine dynamic effects using a mobile engineering seismometric station and SM-3 sensors. The findings indicated that with the presence of elastic substrates beneath the sleepers on the zone of rail joints, the angle of load distribution within the layer of the ballast becomes larger, the stresses in the foundation, and the magnitude of vibrations become lower. This is used to increase the lifespan of the structural components of the upper structure of the railway track, decrease the repair expenses at present, prolong the inter-repair service, and enhance the safety of the train traffic.

Simulation and Performance evaluation of an energy-regenerative suspension system based on a quarter-car model

Nguyen, Khac Tuan — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 75-81.
Khac Tuan Nguyen, Duy Hung Mac, Duc Hoang Tran, Khac Minh Nguyen
This paper proposes a hydraulic suspension integrated with an energy-regeneration mechanism for a quarter-car model. A nonlinear dynamic model is built and co-simulated in MATLAB–AMESim under ISO road excitations (Classes A-C) and varying speeds. The system converts vibrational energy to electricity through a hydraulic-mechanical-electrical chain including a rectifying circuit, hydraulic motor, and DC generator. Compared with a conventional suspension, the proposed system improves ride comfort and harvests energy simultaneously. At 20 m/s on ISO-C, the RMS vertical acceleration of the sprung mass decreases by 43.5 %; the maximum regeneration efficiency reaches 14.83 % at 30 m/s. Recovered energy increases with both road roughness and speed, up to 96.04 J at 30 m/s. Results confirm the feasibility of hydraulic regenerative suspensions for enhancing comfort and energy utilization in modern vehicles.

Development of water-resistant modified fiber-reinforced concrete

Jamalova, Khayala — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 396-402.
Khayala Jamalova, Tahira Hagverdiyeva, Amirov Tursoat, Qurbonov Bobomurod, Sukhrob Rakhmatov, Amanova Nozima
The conducted scientific research has shown that the waterproofing index of fiber-reinforced concrete samples with modified adhesive polypropylene fiber is higher than that of fiber-reinforced concrete samples with polyethylene terephthalate fiber. The possibility to improve of these indicators using ultra-fine mineral additives was experimentally studied. It was found out that after applying these ultra-fine mineral additives (aluminum oxide production waste) the waterproofing index of fiber-reinforced concrete increases significantly. The results of waterproofing index tests conducted on fiber-reinforced concrete samples with modified adhesive polypropylene fiber show that the samples are resistant to the impact of a water jet under a pressure of 10-12 atm (45.87 MPa), while fiber-reinforced concrete samples with modified adhesive polyethylene terephthalate fiber are resistant to a pressure of 9-11 atm (45 MPa).

Dynamic response and oscillations of an elastic spherical body in the field of an external harmonic wave

Almuratov, Shavkat — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 605-609.
Shavkat Almuratov, Jakhongir Shomurodov, Oksana Savenko, Nargiza Toshboyeva
This paper examines the interaction of a plane longitudinal elastic wave with a spherical body with physical and mechanical properties different from those of the host medium. The mathematical model is constructed using wave equations for scalar and vector potentials. The solution is presented as expansions in orthogonal spherical harmonics. The influence of the incident wave frequency on the stress-strain state of the interface is analyzed.

Dynamic interaction of bridge spans and piers as a tuned system for seismic load reduction

Rakhimjonov, Ziyovuddin — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 126-133.
Ziyovuddin Rakhimjonov, Fakhriddin Zokirov, Artanti Lintang
Bridges located in seismic regions are subjected to strong dynamic actions that may cause excessive bending moments, shear forces, and displacements in piers and foundations. In conventional seismic design, the bridge span is commonly treated as a rigid inertial mass transmitting earthquake-induced forces to the supports, while the beneficial dynamic interaction between the span and the pier is not fully utilized. This study proposes a seismic protection approach in which the bridge span is considered as a tuned dynamic component capable of reducing the response of the pier. A coupled two-degree-of-freedom mathematical model of the span–pier system subjected to base excitation is developed, and a parametric analysis is carried out to determine rational stiffness and damping parameters of the span–support connection. The optimization procedure is performed under practical displacement constraints imposed by the deformation joints. The results show that the most efficient vibration reduction is achieved for properly selected stiffness and damping ratios, with the practical stiffness range lying near f= 0.12 and f= 0.2-0.3, depending on the adopted damping level. For the considered bridge, the permissible relative displacement of the span with respect to the support is 6-12 cm, and the bending moments in the pier can be reduced by up to 2.33 times compared with the conventional seismic design approach. The proposed method improves the seismic reliability of reinforced concrete bridge systems without introducing additional external damping masses.

Optimization of polymer-sulfur asphalt concrete composition for high-temperature pavement applications

Mamatmuminov, Alisher — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 410-415.
Alisher Mamatmuminov, Ibragim Sadikov, Yuriy Vasilyev, Elyor Sottiqulov, Baxrom Tovboyev, Suxrob Tilakov
In this article, research was conducted on the selection and calculation of the composition of polymer-sulfur asphalt concrete resistant to high-temperature operating conditions. In addition, scientific research was conducted on the granulometric composition and physical and mechanical properties of crushed stone, sand, and mineral powder, which are considered mineral fillers in polymer-sulfur asphalt concrete. As a result of the test processes, 7 different compositions of polymer-sulfur asphalt concrete were developed. This made it possible to determine the physical and mechanical properties of polymer-sulfur asphalt concrete.

Frequency-dependent degradation of cohesion and deformation behavior in moist loess soils

Khakimov, Gayrat — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 134-139.
Gayrat Khakimov, Khadicha Abduraimova, Sayyora Tadjikhodjaeva, Makhsudali Qambarov, Abdukayum Berdimurodov, Ganisher Malikov
This article presents the results of laboratory experiments investigating the influence of dynamic vibration frequency on changes in the cohesion and deformation of moistened loess soil. It is known that as the intensity of oscillations increases, the strength characteristics of moistened loess and other weakly cohesive soils decrease. This is primarily due to a reduction in cohesion, which in turn leads to an increase in soil deformation. It should also be noted that the vibration frequency plays the most significant role in structural degradation, cohesion reduction, and increased soil deformation. Analysis of the consequences of many destructive earthquakes shows that high-frequency earthquakes are the most dangerous for moistened loess and other weakly cohesive soils in terms of disrupting their dynamic stability.

Metrological calibration and uncertainty evaluation of MEMS accelerometers for structural health monitoring in seismic regions

Mamatov, Akmaljon — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 140-144.
Akmaljon Mamatov, Xusniddin Sotvoldiyev, Miraziz Talipov, Said Shaumarov, Konul Gafarbayli, Diyorbek Bekmirzaev
This study presents a metrological assurance framework for MEMS accelerometers used in structural health monitoring (SHM) of buildings in seismically active regions. The methodology integrates ISO 16063-21 calibration, JCGM 100 (GUM) uncertainty evaluation, and field validation. Three MEMS accelerometers (ADXL355, MPU-6050, LIS3DHH) were calibrated across 1-200 Hz at 0.1-1.0 g. The expanded uncertainty (k= 2) ranged from 2.3 % to 5.8 %. Field validation on a five-story building in Tashkent confirmed that the ADXL355 estimates natural frequencies within 1.2 % of a reference accelerometer (R2= 0.999). The ADXL355 satisfies ISO 16063-21 requirements and provides adequate performance for seismic zones VII-IX. The proposed framework contributes to standardized low-cost vibration monitoring procedures in Central Asia.

Numerical modeling of fiber reinforced concrete beams using ANSYS

Kholmirzaev, Sattar — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 610-615.
Sattar Kholmirzaev, Akmaljon Akhmedov, Sobirjon Razzakov, Abdurasul Martazaev, Asalkhon Juraeva
This paper provides a numerical analysis of reinforced concrete and fiber-reinforced concrete beams under a static loading using ANSYS Mechanical. The chief aim is to compare the stress-strain condition, crack formation, deformation behavior, and load-bearing ability of the ordinary reinforced concrete beams with beams reinforced with steel and basalt fibers. The three-dimensional finite element models have been developed with the consideration of the real beam geometry, nonlinearity of the material behavior, reinforcement action, and the boundary conditions. It was a model of concrete and fiber-reinforced concrete where the proper physical and mechanical properties were used, and the reinforcement was described with the help of an ideal elastic-plastic model. The quantitative findings indicate that fiber reinforcement enhances crack resistance, narrows crack width, and augments ultimate bending capacity of the beams. One of the series studied, a specimen with 100 percent steel fiber reinforcement, gave a high bending moment of 21.42 kN·m, as compared to 15.86 kN·m with the normal reinforced concrete beam, or a 35 percent increase. The findings support the idea that the dispersed fiber reinforcement can play an important role in promoting the structural performance of reinforced concrete beams and can be successfully implemented in engineering practice.

Effect of binary microfillers on hydration kinetics and microstructure development of cement binders in seismic areas

Abdullaev, Ulugbek — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 416-422.
Ulugbek Abdullaev, Shuxrat Eshbekov, Xiaokang Zhao
This article presents the results of experimental studies binary microgenerators present a novel approach to this challenge by actively influencing the kinetics of hydration and crystallization. This study aims to investigate the specific influence of binary microgenerators, composed of mechanically and electrochemically active components, on the processes governing the structure formation of Portland cement-based binders. Cement paste and mortar samples were prepared with incremental additions of the binary microgenerator. The hydration process was monitored using isothermal calorimetry. The developing microstructure was analyzed through scanning electron microscopy (SEM) and X-ray diffraction (XRD). Mechanical performance was evaluated by testing compressive strength at 1, 3, 7 and 28 days. The incorporation of binary microgenerators significantly altered the hydration kinetics, demonstrating a pronounced acceleration of the main exothermic peak.

Effects of a binary microfiller-based superplasticizer on the workability, strength, and durability of concrete

Abdullaev, Ulugbek — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 423-429.
Ulugbek Abdullaev, Erkin Kaxarov, Xiaokang Zhao, Wang Zhiyu
This article investigates the influence of a new-generation high-performance superplasticizer, developed by the Arment Construction Chemicals Company, on the properties of fresh and hardened concrete. The innovative admixture is characterized by a synergistic polymix formulation of advanced polymers, combined with a proprietary binary filler system. The primary objective of the research is to evaluate the efficacy of this composite chemical in enhancing workability, mechanical strength, and durability beyond the capabilities of conventional superplasticizers. The experimental methodology involved preparing concrete mixtures with varying dosages of the new superplasticizer, which were compared against control mixes and those containing traditional water-reducers. The fresh properties assessed included slump, slump retention over time, and setting time. For the hardened state, compressive and flexural strength tests were conducted at different curing ages, alongside an analysis of durability indicators such as water permeability and resistance to chemical attack.

Correlation between carbide morphology and mechanical properties of 35XMA steel under multi-stage thermal exposure

Ubaydullaev, Muzaffar — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 439-444.
Muzaffar Ubaydullaev, Elena Ruklinskaya, Umidbek Kosimov, Utkir Khalikulov, Emir Musaev
The paper investigates the effect of multi-stage heat treatment modes on the microstructure and performance characteristics of modified 35KhML (35XMA) chromium-molybdenum steel. It was established that the application of a complex nano-modifier, combined with optimized double-stage tempering (600-650 °C), facilitates the transformation of a course as-cast structure into fine-dispersed sorbite. Particular attention is paid to the morphology of carbide phases and their role in preventing temper embrittlement. The results demonstrated a 45 % increase in impact toughness and a 20 % reduction in the abrasive wear rate.