Vibroengineering Procedia: Table of Contents

A comparative study of 2D and 3D modeling of turbulent flow over a backward-facing step using the GEKO turbulence model

Madaliev, Murodil — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 559-565.
Murodil Madaliev, Muxayyo Tuxtasinova, Zuxraxon Xashimova, Farangiz Abduxakimova, Asadbek Zokirjonov, Mushtariybonu Vohobjonova, Abbosjon Qosimov
This study presents a numerical investigation of turbulent flow over a backward-facing step using the RANS-GEKO turbulence model implemented in ANSYS Fluent. Simulations were performed in both two-dimensional (2D) and three-dimensional (3D) configurations to assess the influence of flow dimensionality on separation and reattachment characteristics. The distributions of pressure coefficient (Cp) and skin friction coefficient (Cf) were analyzed and compared with experimental data from the NASA Turbulence Modeling Resource. The results demonstrate good agreement with experiments, with the 3D model providing more accurate predictions of the recirculation region and reattachment length. The findings confirm that the GEKO model is an effective and reliable approach for simulating complex separated turbulent flows.

Structural and rheological design of self-compacting fine-grained concrete for vibration-free casting

Adilkhodzhaev, Anvar — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 281-288.
Anvar Adilkhodzhaev, Bakhriddin Khasanov, Ilkhom Kadyrov, Mirzokhid Radjabov, Isomiddin Umarov, B. K. Sarsenbayev
This study investigates the development of Self-Compacting Fine-Grained Concrete (SCFGC) optimized for vibration-free technology. By utilizing polycarboxylate superplasticizers and mechanically activated mineral fillers, the research achieves precise control over rheological properties and structural viscosity (reducing it by up to 41 %). Based on Uzbekistan’s CEMI 32.5N Portland cement, the interaction within the “cement-filler-water” system enhances the cement stone microstructure, ensuring high durability and dense structure formation. This approach significantly improves energy efficiency, enables noise reduction, and lowers labor intensity, offering a sustainable solution for modern monolithic and prefabricated construction.

Performance optimization of concrete modified with volcanic ash-based composite adhesive and finely dispersed mineral fillers

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

Vibroengineering Procedia, Vol. 62, 2026, p. 289-294.
Tursoat Amirov, Khojiakmal Aripov, Abdusalom Djumayev, Majidbek Jumogulov, Abbas Guvalov, Saida Abbasova, Ilhom Kadirov
This study investigates the physical and mechanical properties, frost resistance, and bond strength to reinforcement of concrete incorporating a composite adhesive modified with finely dispersed volcanic ash, and determines the optimal mix design for B30 class concrete. The results reveal that the composite adhesive content is the key factor influencing compressive strength. Optimal parameters were established as 20-25 % mineral filler, a water-cement ratio of 0.25-0.28, and 440-450 kg/m3 of composite adhesive, achieving a compressive strength of 48-49 MPa, which exceeds the B30 requirement (47.9 MPa). The modified concrete demonstrated frost resistance up to F300 and a bond strength of 6.2 MPa, nearly three times higher than that of conventional concrete. Heat-moisture curing further increased strength by 10-15 % compared to natural curing. The findings confirm that volcanic ash-based composite adhesive significantly improves strength, durability, and reinforcement adhesion, while reducing cement consumption by 130-150 kg/m3, ensuring both economic and environmental benefits for large-scale concrete production

Influence of elastic element parameters on stress distribution and reaction forces in shaft support systems of sawing cylinders

Makhmudova, Shakhnoza — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 1-8.
Shakhnoza Makhmudova, Gulnora Yuldasheva, Feruza Azimova, Dilafruz Akhmedova
This study investigates the effect of elastic element thickness variation in combined shaft supports on stress distribution and reaction forces in sawing cylinder systems. Two computational models were developed: (1) with elastic element thickness at support A greater than or equal to support B (A≥B), and (2) with thickness at support B greater than or equal to support A (B≥A). The analysis demonstrates that variations in elastic element thickness significantly influence stress distribution and reaction forces in the system. When the thickness at support A exceeds that at support B, shaft stresses decrease from 198×106 to 112×106 Pa, while reaction force at support B decreases from 943.24 N to 918.02 N. Conversely, when the thickness at support B exceeds that at support A, stresses increase from 8.83×106 to 183×106 Pa, with reaction force at B increasing from 899.04 N to 931.19 N. The results show that optimizing elastic element parameters can significantly reduce operational stresses in shaft support systems.

Synergistic effect of binary filler systems on the microstructural stability and dynamic strength of high-performance cement binders

Adilkhodjaev, Anvar — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 295-303.
Anvar Adilkhodjaev, Ilkhom Kadirov, Saidmurad Niyazbekov, Farkhod Abdukadirov, Abbas Guvalov
This study presents a comprehensive theoretical and experimental investigation into the synergistic interactions of binary mineral fillers (active microsilica and limestone) and their influence on the structural stability and mechanical performance of CEM I 42.5N binders. Grounded in V. I. Salamatov’s surface activity theory, the research establishes a novel quantitative relationship between particle dispersity and the formation of high-density interfacial transition zones. By systematically varying mass fractions (0-20 %), we identified a non-linear synergistic effect that significantly enhances the material's damping potential – a critical factor for infrastructure subject to cyclic loads. Experimental data, validated through statistical analysis, confirm that optimal binary compositions yield a dense microstructure with compressive strength reaching 71.5±1.5 MPa, representing a 24 % increase over the control. Furthermore, the study introduces a mathematical framework to predict strength kinetics as a function of filler surface activity (Fm). This dual-mechanism approach (hydration intensification vs. micro-structural densification) provides a resource-efficient strategy for designing vibration-resistant composites in digitalized construction frameworks.

Dynamic performance analysis of a vibration-seismic control system for a metro-adjacent theatre

Han, Yanyan — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 82-91.
Yanyan Han, Xingliang Gao, Dianlong Sun, Qinghai Sui, Jianli Wang, Zi’ang Kong
To address both vibration control and seismic safety for metro-adjacent buildings, this paper proposes a vibration-seismic control (VSC) system integrating steel spring isolators and limiters. The isolators mitigate vertical vibration, while the limiters provide lateral stiffness to restrain isolation layer displacement during earthquakes. Taking the Music Conservatory Theatre of the Chinese University of Hong Kong, Shenzhen (CUHK-SZ) as a case study, finite element models of three structural schemes (non-isolated, vibration-isolated, and VSC) are established to compare dynamic responses under rare earthquakes. Results show that steel springs effectively mitigate metro-induced vibrations, reducing the maximum vibration level and secondary noise by more than 20 dB/dB(A). With the integration of limiters, the VSC system retains vertical isolation performance while restricting the inter-story drift ratio to 2 %-3 %, meeting the design requirements. The proposed VSC system achieves synergy between vertical vibration isolation and horizontal seismic resistance, providing a reliable solution for acoustically sensitive buildings adjacent to metro corridors.

Structural assessment and finite element modeling of the Volaidai Abdulazizkhan Mosque in the Bukhara region using LIRA-SAPR

Khodjaeva, Zulfiya — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 92-99.
Zulfiya Khodjaeva, Lola Usmankhodjaeva, Karomat Shukurova, Makhliya Utegenova, Dildora Saydullaeva
Historical monuments and cultural heritage objects play a fundamental role in ensuring the preservation of national identity and cultural continuity. The assessment of their structural condition using advanced computational technologies is an urgent scientific and practical task. This study investigates a XVI-century architectural monument – the Volaidai Abdulazizkhan Mosque located in the Bukhara region. A three-dimensional (3D) finite element model was developed using LIRA-SAPR software, and the structural behavior under static and dynamic loading conditions was analyzed. The stress-strain state, deformation characteristics, and seismic response of the structure were evaluated. The results reveal the presence of localized stress concentrations and deformation zones, particularly in the foundation and dome-wall connection areas. Despite these local effects, the overall structural stability remains within permissible limits. The obtained results provide a reliable basis for assessing structural safety and developing strengthening measures for historical monuments.

Performance optimization of concrete modified with composite adhesive incorporating finely dispersed volcanic Ash

Guvalov, A. A. — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 304-309.
A. A. Guvalov, S. I. Abbasova, N. Z. Ahmadly, Ilkhom Kadirov, Dilshod Imamaliev
This study investigates the mechanical performance, durability, and bond behavior of concrete modified with a composite adhesive incorporating finely dispersed volcanic ash. The objective is to determine optimal mixture parameters for B30 class concrete using a three-factor Box-Behnken experimental design, considering filler content (20-60 %), water-to-binder ratio (0.25-0.45), and adhesive consumption (200-450 kg/m3). Concrete specimens were evaluated in terms of compressive and flexural strength, elastic properties, frost resistance, and bond strength to reinforcement under both natural curing and heat-moisture treatment (80 °C). The results show that adhesive consumption is the dominant factor influencing compressive strength. Optimal parameters (20-25 % filler, water-binder ratio of 0.25-0.28, and adhesive consumption of 440-450 kg/m3) ensure a compressive strength of 48-49 MPa, exceeding the requirements of class B30. Frost resistance increased up to F300, while bond strength reached 6.2 MPa, approximately three times higher than that of conventional concrete. Heat-moisture treatment further improved strength by 10-15 %. The observed improvements are attributed to the synergistic interaction between the composite adhesive and volcanic ash, leading to pore refinement and the formation of additional secondary C-S-H phases. The proposed approach enables a reduction in cement consumption by 130-150 kg/m3, contributing to improved economic efficiency and reduced environmental impact.

Locomotion analysis of a pantograph-based adaptive wall-pressing in-pipe robot with a slider-crank drive and overrunning clutches

Korendiy, Vitaliy — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 9-17.
Vitaliy Korendiy, Maksym-Pavlo Zelinskyi, Taras Vilchynskyi, Rostyslav Predko, Viktor Lozynskyi, Nataliya Hembara
The paper addresses the locomotion analysis of a pantograph-based adaptive wall-pressing in-pipe robot with a slider-crank drive and overrunning clutches. A reduced kinematic scheme is developed using the axial coordinates of two traction modules and the crank angle as the main variables. In contrast to rigidly coupled designs, the pusher acts on one module through a compliant flat spring-damper element, which enables smoother force transmission and more realistic switching transients. On this basis, a hybrid dynamic model is formulated by combining the drive force, friction-limited clutch reactions, rolling resistance, and the axial component of gravity. Simulations are carried out for horizontal, inclined, and vertical pipelines. The obtained results show stable one-way locomotion in all considered cases, while the motion efficiency decreases with increasing inclination. The proposed concept is effective for adaptive in-pipe locomotion, although vertical climbing requires further optimization of the preload and damping parameters.

Effect of heat treatment parameters on the microstructure and hardness of steel 45 produced by the electroslag remelting process

Ruklinskaya, Elena — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 310-317.
Elena Ruklinskaya, Muzaffar Ubaydullaev, Umidbek Kosimov, Alisherova Kseniya
Modern requirements for the quality of structural steels used in the manufacture of critical machine and mechanism components necessitate the application of highly efficient metallurgical technologies capable of producing metal with a high degree of purity and structural homogeneity. One of such technologies is electroslag remelting (ESR), which is widely employed for producing high-quality ingots of structural and alloy steels. In the present study, the influence of various heat treatment regimes on the microstructure and hardness of structural steel 45 produced by the electroslag remelting process was investigated. The experimental program included normalization, quenching with cooling in water and oil followed by tempering. Metallographic examinations were carried out using optical microscopy after standard preparation of metallographic specimens and chemical etching. The hardness of the samples was determined using the Rockwell hardness test. It was established that the initial microstructure of the steel after electroslag remelting is characterized by a ferrite-pearlite structure with relatively coarse grains. Normalization leads to the formation of a fine-grained ferrite-pearlite structure with moderate hardness. Water quenching provides the maximum increase in hardness; however, it is accompanied by the development of significant internal stresses and the formation of quenching cracks. The most rational heat treatment regime was found to be oil quenching followed by high tempering, which ensures the formation of tempered martensite (tempered sorbite) and provides an optimal combination of strength and plastic properties of the material. The obtained results can be used in the development and optimization of heat treatment regimes for critical components made of steel 45 produced by the electroslag remelting method.

AHP-based assessment and service-life prediction of urban reinforced concrete bridge structures: a case study from Tashkent

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

Vibroengineering Procedia, Vol. 62, 2026, p. 566-576.
Ulugbek Shermukhamedov, Andrey Belyi, Dilfuza Eshmamatova, Jakhongir Azimov, Mamura Sobirova, Diyorbek Bekmirzaev
. This study presents a mathematical framework for assessing and predicting the technical condition of urban reinforced concrete bridge structures under the operating conditions of Tashkent. The empirical basis of the study includes visual inspection data collected from more than 30 bridges and overpasses, where defects and damage were evaluated using five technical and operational indicators: load-bearing capacity, throughput capacity, durability, traffic safety and comfort, and maintainability. To quantify the relative importance of these indicators, the hierarchy analysis method was applied in MPriority 1.0, and the resulting weighting scheme demonstrated acceptable consistency (OC = 5.29 %). Based on the obtained weights, a generalized technical condition indicator was formed and integrated with a wear-function-based service-life prediction model. A software-based assessment procedure was used to support practical evaluation of reinforced concrete bridge structures. The case analysis showed that the overpass located at the intersection of Gavkhar and Bunyodkor streets in Tashkent has entered an unsatisfactory condition stage after approximately 24 years of operation, while its estimated service life is 35-38 years. The proposed approach can be used as a decision-support tool for bridge-condition assessment and maintenance planning in urban transport systems.

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.

Low-velocity impact positioning on composite honeycomb panels using a DPL-R regression

Zheng, Zhaoyu — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 325-330.
Zhaoyu Zheng, Ye He, Junshan Wang, Yan Tang, Shenzhen Tian
This paper proposes a low-velocity impact localization method for carbon fiber/aluminum honeycomb panels using a regression framework based on Discriminative Projective Dictionary Pair Learning (DPL-R). Multi-channel FBG responses are converted into statistical features and mapped through a discriminative dictionary pair to obtain sparse representations, which are used for coordinate regression with a residual-weighted strategy. The method requires no wave-velocity modeling or finite-element simulation, making it suitable for complex panels under low sampling rates. Experiments on a 14×14 training grid and 20 free impacts show an average error of 3.64 mm, demonstrating its effectiveness for satellite-borne composite panel monitoring.

Increasing the remaining useful life of asphaltic concrete coatings by improving the technology of road repair

Akbarli, Reyhan Sayyad — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 331-338.
Reyhan Sayyad Akbarli, Ramazon Juma O’g’li Qulmamatov, Nozima Shavkatovna Amanova, Suxrob Soli O’g’li Raxmatov, Temur Shuxrat O’g’li Bobonazarov
The article examines and presents the results of the analysis of road repair processes in the Republic. Foreign experiences in improving the technology of repairing asphalt concrete paved roads were also reviewed. Specifically, the service life of roads with asphalt concrete pavements, the requirements for repair materials, and the impact of weather and climate factors were studied. Based on this research, recommendations were developed, and their economic efficiency was calculated and scientifically substantiated through experiments.

Determination of the designed deformation properties of soils under radial stresses inside the borehole

Khasanov, Askar — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 339-348.
Askar Khasanov, Nigora Nabiyeva
The paper presents a method for determining the deformation modulus of soils using a sand pleximeter installed inside a borehole. Radial stresses generated by the compressed sand core produce measurable wall displacements, which form the basis for evaluating the deformation modulus. The limitations of the classical Lamé solution-particularly its overestimation of radial stress decay due to the negligible tensile capacity of soils-are highlighted. To address this, new coordinate functions are proposed and calibrated with laboratory data, showing significantly better agreement with measured stress attenuation. The study also analyzes the corresponding radial displacement fields and outlines practical applications of the obtained modulus in geotechnical design.

Estimation of a monolithic reinforced concrete overpass under the seismic effect

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

Vibroengineering Procedia, Vol. 62, 2026, p. 100-106.
Ulugbek Shermukhamedov, Diyorbek Bekmirzaev, Said Shaumarov, Anora Karimova, Abdurakhim Abdullaev, Xin Liang
The given research is made as a seismic investigation of a monolithic (continuous) reinforced concrete overpass that is placed at 1083 km length of the M-39 highway that is passed the city of Samarkand. The main aim was to determine the structural performance of the overpass with the force of seismic loading, especially the influence of the tremor initiated by the forces on the foundation aspects of the overpass. The Midas Civil software package was used as the analysis tool and the Finite Element Method (FEM) was utilized under frame work of the linear spectral theory that is commonly employed in the analysis of seismic performance in building structures. The outcomes of the computational model indicate that the stress induced by the piles on the underlying soil is within recommended limits and this implies that there can be a stable interaction between the subgrade and the foundation in the case of seismic activities. In addition, analysis determined maximum bending moment near the pile head, which happens to be a critical point that usually has the maximum stress concentrations under lateral motion of the ground. This observation makes it necessary to strengthen the pile head area to make the structure secure. The findings of the study will provide significant information on seismic resistance of reinforced concrete bridges and will also serve the purpose of enhancing bridge design researches in regard to ensuring earthquake resistance in a bridge. The findings can also be used to have a wider implication of the developments of infrastructure in Uzbekistan concerning the introduction of the betterment of the safety and reliability of the highway overpasses in seismically active areas.

Forecast of the service life of rails and reinforced concrete sleepers taking into account the stress-strain state under operating conditions in Uzbekistan

Djabbarov, Saidburkhan — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 577-584.
Saidburkhan Djabbarov, Nodirbek Kodirov, Erkin Kakharov, Saulet Shayakhmetov
This study presents a numerical investigation of the stress-strain state of the R65 rail and reinforced concrete sleeper using the finite element method. Three-dimensional finite element simulations were performed in the ABAQUS environment. Fatigue life assessment was subsequently carried out using the nCode DesignLife software, and corresponding S-N curves were constructed. The obtained results indicate that the predicted service life of the rail is approximately 770 million tons of accumulated gross traffic, while the reinforced concrete sleeper operates within the infinite fatigue life region of concrete. The developed approach makes it possible to predict the durability of railway track superstructure elements and to support optimization of maintenance planning.

Monitoring results of the railway bridge: vibration of decking structures under forced vibration of passing trains

Takhirov, Shakhzod — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 231-237.
Shakhzod Takhirov, Diyorbek Bekmirzaev, Said Shaumarov, Ibrakhim Mirzaev, Ulugbek Shermukhamedov, Zukhritdin Ergashev, Abdurakhim Abdullaev
This paper presents preliminary results of vibration monitoring of a railway bridge located in the Sergeli district of Tashkent, Uzbekistan. The study focuses on evaluating the dynamic behavior of load-bearing components under operational conditions. A sensor-based approach was employed to record and analyze vibration responses rather than traditional monitoring techniques. Field data were obtained using high-sensitivity accelerometers installed on the bridge girders and supports. In addition, a position transducer was installed to monitor the gap opening between the two beams at the top of the bridge. To measure the rail's deformation under dynamic loading, a strain gauge was installed directly next to one of the accelerometers. All sensors were integrated with a data acquisition system to ensure correlation between data collected by various sensors. The collected data were analyzed in the time domain and in the frequency domain to identify dominant vibration modes, natural frequencies, and possible irregularities. The results indicate clear vibration patterns associated with train-induced and ambient excitations, reflecting the bridge’s structural performance and stiffness distribution. Only a small portion of the results is discussed in this paper. This monitoring approach and its findings provide a foundation for developing a long-term structural health monitoring system and enhancing the safety of railway bridges operating in seismic and high-load regions.

Design and numerical simulation of the downhole hydraulic turbine rotary shoe structure

Yao, Zhaoqi — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 585-590.
Zhaoqi Yao, Yongdong Huang, Haonan Cui, Weiguo Yan, Xiaojun Zhou
To improve the cleaning efficiency of the downhole hydraulic turbine rotary shoe, a simulation study was conducted using the Fluent module of ANSYS. The Euler-Euler method was employed to address the fluid-solid coupling between the fluid and the cuttings, in order to investigate the impact of different nozzle diameters on the cleaning performance of the rotary shoe. The results of the study indicate that a nozzle diameter of 22.5 mm achieves the best cleaning performance.

The effect of polypropylene fibre and silica fume on the properties of tunnel slag shotcrete

Ju, Gaoquan — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 349-355.
Gaoquan Ju, Jinpeng Lu, Liping Dang
The application of tunnel slag in shotcrete effectively addresses resource and environmental issues arising from the accumulation of excavated material. However, the high content of slag aggregate stone powder and the rough surface will lead to poor performance of shotcrete. In this paper, the effects of different dosages of silica fume (SF) and polypropylene fiber (PPF) on the workability, mechanical properties and impermeability of shotcrete were studied to determine the optimal dosage. The results showed that the incorporation of SF improves the mechanical properties of shotcrete, and the 28 d compressive strength and splitting tensile strength increase by 20.9 % and 21.4 %, respectively. The incorporation of PPF improves the workability of shotcrete mixture. However, too high fiber content will lead to fiber agglomeration, which affects the bonding between aggregates and has an adverse effect on strength. The optimum content of SF and PPF is 2.5 % and 2 kg/m3 respectively. The synergistic effect of SF and PPF improves the performance of shotcrete. The 28 d compressive strength (CS) and splitting tensile strength (STS) of tunnel slag-based shotcrete (TSBS) increased by 21.9 % and 25 %, respectively, and the average water seepage height reduced by 41.4 %.

Analytical model for predicting the compressive strength of recycled aggregate concrete

Azizjon, Kayumov — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 591-597.
Kayumov Azizjon, Yahor Zhukouski
The use of recycled concrete aggregate obtained from construction and demolition waste is an effective way to reduce the negative environmental impact of construction and to preserve natural resources. However, concrete produced with recycled concrete aggregate (RCA) generally exhibits lower mechanical properties than conventional concrete made with natural aggregates due to the inferior characteristics of the recycled material. Most existing models for predicting the strength of recycled aggregate concrete (RAC) primarily consider the replacement ratio of natural aggregate, while the intrinsic properties of the recycled concrete aggregate (RCA) are not sufficiently accounted for. This paper proposes a simple analytical model for estimating the compressive strength of concrete with recycled concrete aggregate, which explicitly accounts for the replacement ratio, the strength of the original concrete (fc,r= 40 MPa), and the water absorption of the recycled aggregate (Wr= 2 %). The proposed relationship has a dimensionless form, is based on physically justified parameters, and is intended for preliminary engineering estimations and parametric studies. The analytical and parametric analysis demonstrates that the obtained relationships are consistent with trends widely reported in the scientific literature.

Movable FEM nodes in the problem of interaction between a moving mass and a prestressed beam

Mirzaev, Ibrakhim — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 18-23.
Ibrakhim Mirzaev, Dilbarkhon Askarova
The study of beam vibrations under the influence of a moving locomotive requires the use of advanced mathematical methods. This paper focuses on the application of moving nodes in the finite element method (FEM). The Newmark method used in this work allows for high accuracy and stability of the numerical solution. Real conditions of beam support are taken into account using eccentricities. The calculation scheme takes into account the interaction of the beam with the supporting parts by modelling fixed and moving joints. This allows the mathematical model to closely approximate the description of dynamic processes. As the horizontal speed increases, the amplitude of vertical vibrations increases, which leads to an increase in the dynamic coefficient.

A coupled non-stationary model of airflow and dust transport in underground mine ventilation corridors

Botirov, Tulkin — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 598-604.
Tulkin Botirov, Azizjon Boboyev, Shahriyor Latipov, Zukhriddin Amirkulov, Tolibjonov Shokhzhakhon
Effective ventilation in underground mines is essential to reduce hazardous dust concentrations. This study develops a non-stationary mathematical model of airflow velocity and dust transport in mine corridors based on momentum conservation and convection-diffusion equations. The results show that increasing the pressure difference from 30 to 45 Pa increases the airflow velocity from 2.8 m/s to 3.1 m/s (10-11 %). Correspondingly, the maximum dust concentration decreases from approximately 1 mg/m3 to 0.82-0.85 mg/m3 (15-20 %). Numerical simulations in MATLAB confirm the analytical results. The proposed model provides a basis for optimizing ventilation systems and improving safety in underground mines.

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.

Critical speed and forced vibration analysis of rotor-bearing systems with asymmetric elastic bearings

Makhmudova, Shakhnoza — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 24-33.
Shakhnoza Makhmudova, G’ulom Shamanov, Shodiya Murtozoyeva
Vibration in rotor-bearing systems critically affects reliability of rotating machinery. In industrial machines (gin machines, compressors, turbines), transverse vibrations increase due to asymmetric bearing supports and external excitation. This paper presents a dynamic model of a massive rotor with asymmetric elastic bearings using Lagrange equations. Equations of motion are derived in matrix form considering stiffness of elastic elements between bearings and housing. Natural frequencies and critical speeds are determined. Influence of asymmetric stiffness on dynamic characteristics is analyzed. Forced vibrations from rotor unbalance are investigated. Results show operating speed of gin machine shaft is significantly below first critical speed, ensuring stable operation. Elastic polyurethane elements effectively reduce vibration transmission and improve dynamic stability. Unlike existing studies, this work considers asymmetric elastic supports and offset excitation forces within a unified analytical framework. The proposed approach can be applied to a wide range of rotating machinery systems with asymmetric support conditions.

Dynamic and seismic analysis of rooftop greenhouse structures according to QMQ 2.01.03-19

Abdukarimov, Bekzod — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 107-112.
Bekzod Abdukarimov, Mirkomil Hakimov, Mirzohid Sodiqov, Asror Rasulov
This study investigates the dynamic and seismic behavior of greenhouse structures installed on the roofs of buildings in accordance with the requirements of the regulatory document QMQ 2.01.03-19 “Construction in Seismic Zones”. Rooftop greenhouses are considered as additional structural systems integrated with existing buildings, which influence the overall mass distribution, stiffness characteristics, and dynamic response of the structure. In this research, a two-storey building with an arched greenhouse structure located on its roof was adopted as the research object. The greenhouse and building were analyzed as a single spatial structural system. Seismic inertial forces were determined based on the mass of structural elements and seismic acceleration parameters. The results showed that the total mass of the greenhouse structure is 910 kg, with the metal frame accounting for the largest portion. Due to the additional mass at the roof level, seismic inertial forces increase significantly, reaching values from 13.6 kN to 27.3 kN for seismic accelerations of 1,5-3,0 m/s2. The study demonstrates that reducing structural mass, ensuring uniform stiffness distribution, and strengthening connection nodes are key factors in improving the seismic stability of rooftop greenhouse systems.

Improving the mechanical properties of Grade 45 steel and evaluating the feasibility of using Cr-Mo steels for ball rolling mill guide shoes

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

Vibroengineering Procedia, Vol. 62, 2026, p. 356-362.
Muzaffar Ubaydullaev, Elena Ruklinskaya, Umidbek Kosimov, Utkir Khalikulov, Arsen Ananyan
Enhancing the mechanical properties of guide shoes in ball rolling mills (BRM) directly contributes to increasing the service life of these components. This study examines various methods for improving durability, ranging from hard facing with wear-resistant alloys to optimizing heat treatment parameters and replacing conventional Grade 45 structural steel with alloyed wear-resistant grades. The research focuses on the surface hardening of Grade 45 steel guide shoes using liquid ferritic nitrocarburizing (carbonitriding) and evaluates the potential of replacing them with 55Cr2MoL alloy steel. The relevance of this work is driven by increasing requirements for the operational resource of rolling equipment under conditions of higher rolling speeds and more severe operating environments. Based on the analysis of the base material properties and thermal strengthening results, changes in strength, hardness, and wear resistance of the guiding elements were evaluated under various processing regimes. Comparative analysis between Grade 45 steel and chromium-molybdenum steels allowed for assessing their potential as alternative materials for guide units. It is demonstrated that the implementation of Cr-Mo steels can significantly increase the unit's resource and operational reliability due to their superior resistance to abrasive wear and thermal loads. The findings of this study can be applied to the modernization of ball rolling mills and the selection of structural materials for equipment operating under combined thermal and mechanical stress.

Vibration performance assessment and model order reduction of power electronic modules under realistic regional road excitation profiles

Ataeva, Gulchekhra — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 238-245.
Gulchekhra Ataeva, Zebo Abdurakhmonova, Liliya Filimonova, Shakhnoza Shadiyeva
Power electronic modules (PEMs) in electric vehicles (EVs) are exposed to continuous mechanical vibration during operation, which may adversely affect their structural integrity and long-term reliability. This study investigates the vibration behaviour of PEMs used in EVs operating under road conditions relevant to Uzbekistan, with emphasis on modal characteristics, harmonic response, and computationally efficient structural analysis. A finite element model of the module was developed in order to identify critical vibration modes and resonance-sensitive frequency ranges. To reduce computational cost, a model order reduction (MOR) approach based on the Guyan reduction method was applied and validated against the full finite element model. The results indicate that the most critical structural response occurs in the 87-125 Hz range, where torsional and twisting modes of the heat sink and printed circuit board become pronounced. The reduced-order model preserved the dominant dynamic characteristics of the full model while significantly decreasing computational demand. The study provides a practical framework for vibration-oriented assessment and design improvement of PEM structures for EV applications under locally relevant operating conditions.

Evaluation of the strength characteristics of the modernised design of the passenger car bogie frame

Rahimov, Rustam — 2026-06-08T00:00:00Z

Vibroengineering Procedia, Vol. 62, 2026, p. 246-251.
Rustam Rahimov, Olmos Zaynitdinov, Diyor Zafarov, Akmal Abidov
The paper analyses the design solutions of modern foreign passenger car bogies, on the basis of which a modernisation of the 68-921 (68-922) bogie frame manufactured by JSC “TVSRZ” is proposed. Long-term operating experience confirms its high strength and dynamic performance due to the significant load-bearing capacity of the frame elements. However, previous studies have revealed reserve strength in the main structural components, resulting in increased tare weight of the bogie and the vehicle as a whole. The proposed modernisation involves optimisation of the cantilever sections, cross beams, central suspension elements and cross stops, resulting in improved manufacturability and a reduction in frame weight by 106 kg (from 1760 to 1654 kg). The strength of the modernised design was evaluated using the finite element method in SolidWorks Simulation under three design modes. The results show that, despite weight reduction and structural modifications, the equivalent stresses (according to the von Mises criterion) comply with regulatory requirements for all considered loading conditions.

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