Vibroengineering Procedia

Vibroengineering Procedia, Vol. 60, 2025, p. 533-541.Ziyoda Mukhamedova, Sherzod Fayzibayev, Oleg Ignatenko, Rustam KuchkarbayevThis study presents a novel high-pressure, high-temperature (HPHT) synthesis route for WC-Co cemented carbides, aiming to overcome the classic hardness-toughness trade-off. WC-Co composites were synthesized directly from elemental W, C, and Co under thermobaric conditions (4-8 GPa, 1200-2200 °C), enabling in situ WC formation and densification in a single step. Structural characterization (XRD, SEM, TEM), mechanical testing (hardness, fracture toughness, wear resistance), and electrophysical analysis (resistivity, magnetic saturation) were performed. The synthesized composites achieved 13-15 GPa hardness and 12-14 MPa·m1/2 fracture toughness, surpassing typical WC-6Co grades (12-14 GPa hardness and 8-11 MPa·m1/2 toughness). These findings demonstrate that HPHT synthesis yields dense, homogeneous WC-Co materials with superior balance of mechanical properties and thermal stability, providing a viable alternative to conventional sintering.

Vibroengineering Procedia, Vol. 60, 2025, p. 332-338.Yiming Xie, Yinfeng Dong, Yiping Wang, Yilin Wang, Feipeng Liu, Hongxing LiIn recent years, frequent tower collapses have been mostly related to fatigue damage. Therefore, this paper systematically studies the fatigue resistance performance and reinforcement methods of tower foundation connection components through on-site tests and finite element analysis. The test analyzed the lifespan, stress-strain characteristics, crack development and mechanical properties of the connection components under fatigue loads; numerical simulation compared the fatigue life and safety of ordinary components, reinforced with steel mesh, C100 high-strength concrete components, and C40 and C100 composite components, etc., providing key basis for engineering reinforcement.

Vibroengineering Procedia, Vol. 60, 2025, p. 133-141.Abdukhamit Abdujabarov, Mashkhurbek Mekhmonov, Maqsudjon Khamidov, Mavjuda Mirkhanova, Auyezmurat YembergenovThe article presents the design of the transition section to be used in different conditions in the region of junction of roadbed and the bridge, establishment and reasons of vertical shifts under the action of vibro-dynamic forces which appear when trains are driven along transition section. Likewise, in the sections of the foundation of the roadbed and the bridge, the types and types of a variety of defects caused by this fact, such as when the pressure of the weight of constant and temporary forces dropped on the rolling stock passes the active pressure of the ground (Ea), which acts on the support of the bridge shore at the point of the passage, are provided. In order to minimize the active effort at the junction formed by soil, reinforce and make the junction location defect-free, reinforced concrete piles are driven into the embankment to act as bases of junction location between the roadbed of the railway and the bridge location and a formula of computing the spacing of the piles has been contributed taking into consideration outer influences.

Vibroengineering Procedia, Vol. 60, 2025, p. 44-53.Olimjon Dusmatov, Muradjon Khodjabekov, Bakhtiyor AshurovIn this work, the issue of checking the dynamics of nonlinear vibrations of a mechanical system protected from vibrations in case of random parametric excitations is considered. Using the Ito method, the analytical expressions of the mean square values of the absolute accelerations of the mechanical system and the dynamic absorber were determined. Statistical linearization method based on Davidenko's hypothesis was used to determine mean squared values. The average square value change of the random parametric vibration of the mechanical system protected against vibrations with the dynamic absorber at different values of the parameter describing the width of the vibration spectrum was analysed. It is shown that if the parameter describing the width of the vibration spectrum is taken smaller, the mean square value of the random parametric vibration of the protected object combined with the dynamic absorber will have a smaller vibration. At different values of the parameter of the hysteresis loop, the change of the mean square value of the random parametric vibration was analysed and appropriate conclusions were drawn.

Vibroengineering Procedia, Vol. 60, 2025, p. 318-324.Kuvandik Lesov, Akmal Uralov, Mukhamedali Kenjaliyev, Ulugbek Ergashev, Feng HuaipingRailway embankments are key elements of transport infrastructure whose stability depends on soil, hydrogeological, and climatic factors. Wind and rainfall erosion threaten slope integrity, causing soil loss and potential landslides. This study integrates field experiments and modeling to assess erosion mechanisms and the effectiveness of geosynthetic geomats for slope protection. Tests on the Bukhara-Miskin railway section determined wind and rainfall thresholds for soil displacement and evaluated geomat performance by slope stability, vegetation density, and runoff resistance. Reinforced slopes showed almost no soil washout, with vegetation density of 4000-5500 kg/ha – over 200 % higher than traditional seeding. Geomat use reduced erosion by up to 80 % and improved ecological resilience, offering a reliable, cost-effective, and sustainable solution for long-term railway slope stability.