Vibroengineering Procedia: Table of Contents

Random vibration testing of a quasi-zero-stiffness isolator for distribution transformers and the effects of composite damping parameters

Ma, Jiangang — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 125-133.
Jiangang Ma, Xiaolong Wei, Mingxin Geng, Yalin Zhao, Liang Wang, Xiaochun Bai, Jiao Yao
To address low-frequency vibration and structure-borne sound transmission in distribution transformers, this study investigates a prototype quasi-zero-stiffness (QZS) low-frequency isolator with a composite particle damping unit. Broadband vertical random-vibration tests over 2-2000 Hz were conducted to evaluate the effects of particle medium and filling ratio, while a simplified nonlinear dynamic model was used to qualitatively assess the influences of structural stiffness, equivalent damping, initial oblique-spring angle, and excitation amplitude. Rubber particles, quartz sand, and hybrid particles were tested at 30 % and 60 % filling ratios using acceleration PSD ratio and isolation efficiency as the main indices. The transmission values reported in the tables are acceleration PSD ratios rather than amplitude transmissibility. Both particle medium and filling ratio significantly affect the frequency-domain response. Across the six conditions, the isolation efficiency ranges from 10.07 to 31.21 dB at 100 Hz and from 16.34 to 40.73 dB at 200 Hz. Quartz sand at 60 % filling performs best, reaching 31.21 dB and 40.73 dB, respectively. Quartz sand and hybrid particles generally show better performance at 60 % filling, whereas rubber particles show reduced performance. These results provide a reference for composite damping design and particle-medium selection in QZS isolators for distribution transformers.

Mechanical properties and durability of basalt fiber-reinforced fine-grained concrete

Shaumarov, Said — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 287-293.
Said Shaumarov, Diyorbek Bekmirzaev, Vladimir Soy, Ne’matjon Mukhammadiev, Ganisher Malikov, Dilshod Tursinaliyev
The creation of modern high-efficiency building materials and products, to which the demands are constantly increasing, can be successfully implemented using technologies using composite materials. Particularly promising are dispersed reinforced concrete, in which a strong matrix and reinforcing fibers are successfully combined. The matrix provides high compressive strength, bending strength, and durability, while dispersed fibers are characterized by significant tensile strength, high elastic modulus, and the ability to distribute loads throughout the entire volume. Such a combination increases crack resistance, improves the operational properties and durability of structures, and opens up new possibilities for use in modern engineering structures and industrial construction.

Optimization of inertial parameters of oscillating masses in a two-mass resonant vibration stand for testing aviation industry products

Kapalo, Roman — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 118-124.
Roman Kapalo, Oleksii Lanets, Iryna Derevenko, Andrii Dziubyk, Ihor Nazar, Ivan Khomych
Optimization of technological equipment parameters allows the development of new efficient designs that can increase production profitability. In this article, the authors present the optimization of the inertial parameters of oscillating masses in a two-mass resonant vibration stand with an unbalance drive. The criterion for the optimization of the inertial parameters of the oscillating masses is the minimization of the power consumption of the electric motor that drives the unbalance. Based on the authors' own scientific developments, analytical dependencies were used to determine the amplitudes of mass oscillations, the stiffness coefficient of the elastic unit, force characteristics, and the unbalance parameters. The dynamic coefficients of the oscillating masses were also determined. These inertial-stiffness, force, and dynamic parameters, expressed as functions of one of the oscillating masses, were used in solving the optimization problem. As a result of solving the optimization problem, it was established that any two-mass oscillatory system with an unbalance drive has an optimal ratio of oscillating masses depending on the resonant tuning of the system. The further the circular frequency of forced oscillations deviates from the resonance frequency, the smaller the oscillating mass on which the unbalance is installed should be compared to the mass that performs the functions of the working body. In near-resonant pre-resonance operating modes, the inertial parameters of the two oscillating masses should be almost identical. It is at such ratios of inertial parameters that the electric motor consumes the minimum amount of power.

Numerical simulation study on the effect of inner conductive ring rotational speed on power rolling rings

Li, Junye — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 360-366.
Junye Li, Chao Wei, Bin Lv, Beiran Zhang, Liang Xu, Pingping Wei
Based on the multibody dynamics simulation method, this study systematically investigates the effect of the inner conductive ring's rotational speed variations on the dynamic behavior of the power rolling ring. By establishing the overall assembly model of the power rolling ring, assigning corresponding material properties (H62 brass and C17200 beryllium bronze) to each component, and conducting transient analysis under different inner conductive ring rotational speeds (180-1000 r/min), the motion trajectory, local stress distribution, and velocity response curves of the flexible ring were obtained. The results indicate that the resultant velocity of the flexible ring increases and its motion period shortens as the rotational speed rises. When the rotational speed exceeds 500 r/min, the system exhibits distinct start-up cycles. The number of these start-up cycles increases with higher rotational speeds, and the velocity response curve displays an oscillatory trend. The findings of this study provide a theoretical basis for the structural optimization and adaptability design of power rolling rings under varying operating conditions.

Effect of flexible ring width on motion trajectory and bending stress in power rolling rings

Li, Junye — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 367-372.
Junye Li, Chao Wei, Gaopeng Shuai, Chuanfeng Wang, Nianhuan Li, Guodong Ni
In this study, an overall simulation model of the power rolling ring, consisting of an outer conductive ring, an inner conductive ring, and a flexible ring, is established using simulation software. A normal refined free quadrilateral mesh is applied to the inner and outer conductive rings, while a finer mesh of the same type is applied to the flexible ring. In the model, H62 brass is selected as the material for the inner and outer conductive rings, and C17200 beryllium bronze is used for the flexible ring. Transient analysis is conducted by defining the rotational speed of the inner conductive ring, the identity boundary pairs at the contact interfaces, and the friction coefficient. The study focuses on investigating the motion trajectory of the power rolling ring and the stress distribution characteristics of the flexible ring under varying widths of 0.6 mm, 0.8 mm, 1 mm, and 1.2 mm. The results indicate that the maximum stress on the flexible ring occurs at its contact positions with the inner and outer conductive rings; furthermore, as the width increases, the maximum stress at the contact points exhibits a trend of initially decreasing and then increasing, and the overall structural motion trajectory of the model proves to be reasonable. This research provides a solid theoretical foundation and an effective methodology for the structural optimization and performance evaluation of power rolling rings.

Coupled electromechanical-hydrodynamic modeling of a low-frequency vibratory cavitator

Korendiy, Vitaliy — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 228-236.
Vitaliy Korendiy, Ivan Aftanaziv, Oleksandr Boiko, Orysia Strogan, Inga Svidrak, Anzhela Shevchuk
A compact coupled model is developed for a low-frequency cavitator with two oppositely moving perforated grates. Mechanical oscillations are linked to voltage-driven coil dynamics, variable air gaps, magnetic saturation, nonlinear hydraulic resistance, liquid added mass, and finite-rate vapor-fraction evolution. Simulations for water at 80°C and an absolute chamber pressure of 0.38 MPa cover 41-100 Hz. For the adopted parameter set, the model predicts that the pressure threshold pmin≤pv is crossed over approximately 41-60 Hz. At 50 Hz, the predicted grate amplitude is 2.21 mm, the minimum local pressure is 41.2 kPa, the peak vapor fraction is 4.8 %, and the RMS coil current is 2.81 A. The predicted total electrical input to the two drives is approximately 0.65 kW, while the fundamental dissipative component of the hydrodynamic load corresponds to an equivalent damping of about 138 N·s/m. The calculated phase lags demonstrate that prescribed in-phase harmonic mechanical forcing is inadequate. The model supports preliminary operating-point selection, while its magnetic and hydraulic coefficients require experimental identification. Published experiments on related devices provide technological context; direct validation of the present model and its extension to other fluid rheologies remain future work.

Excitation of vertical biharmonic oscillations via the phenomenon of self-synchronization

Yaroshevich, Nikolay — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 50-56.
Nikolay Yaroshevich, Vitalii Puts, Tetyana Yaroshevych, Оlexander Shovkomud, Viktor Martyniuk
The possibility of obtaining stable vertical oscillations of a biharmonic vibration platform with four unbalanced vibration exciters, not connected by kinematic transmissions, is demonstrated. For such a dynamic system, the validity of the well-known conditions for the existence and stability of synchronous motions of two vibration exciters rotating in opposite directions at identical frequencies is confirmed. It is shown that the biharmonic regime consists of two independent steady-state monoharmonic regimes, each with its own synchronous frequency, resulting in the excitation of biharmonic oscillations with variable motion asymmetry. The attainment of stable biharmonic oscillations is corroborated through numerical simulations and experimental validation.

Kinematic analysis and slip-roll ratio quantification for conductive roll-ring flexible rings

Li, Junye — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 373-377.
Junye Li, Hongxu Tian, Zengwei Zhou, Jun Zhang, Liang Xu, Pingping Wei
Conductive rolling rings utilize a rolling electrical contact mechanism for power and signal transmission, effectively mitigating friction, enhancing transmission efficiency, and extending service life compared to traditional sliding rings. This study investigates the kinematics of the flexible ring using the simulation method. By analyzing velocity contour plot and decomposing velocity vectors, the superposition characteristics of the ring's spin-orbit coupled motion are elucidated. Simulation results indicate that the linear velocity peaks at 363 mm/s at the inner ring interface and approaches zero at the outer ring. Furthermore, the slide-to-roll ratio was calculated to quantify rolling performance. Across deformation levels ranging from 0.3 mm to 0.7 mm, the SRR remains exceptionally low (0.0008-0.0033). This confirms minimal relative slip at the contact interface, demonstrating an ideal pure rolling friction state. These findings provide a reliable theoretical and simulation basis for structural optimization, friction pair matching, and practical applications of conductive rolling rings.

Vibration mechanism and suppression strategy for the electromechanical-thermal coupled system in distributed drive electric vehicles

Sun, Nannan — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 57-63.
Nannan Sun, Chengyun Su, Aolong Zhang, Yu Duan, Guixiang Zhu, Ruixiang Feng, Kai Chen
Distributed drive electric vehicles face vibration and noise challenges due to the coupling of high-frequency electromagnetic excitation, time-varying meshing stiffness, and thermal deformation, forming a typical electromechanical-thermal multi-field coupled vibration. A systematic investigation into this coupling mechanism and suppression strategy is presented. An electromechanical-thermal multi-field dynamic model is established to reveal multi-field interactions. A hierarchical collaborative suppression method is proposed: structural optimization reduces transmission vibration; control-level model predictive control with harmonic current injection mitigates electromagnetic excitation; thermal-level coolant regulation suppresses thermally induced vibration. Dynamometer tests show that the proposed method reduces critical component vibration by 5 dB(A), significantly improving NVH performance. This study offers a complete technical pathway for low-noise design from mechanism analysis to suppression implementation.

A structural health assessment method for long-span steel box girder cable-stayed bridges based on wavelet transform

Xu, Jintao — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 212-218.
Jintao Xu, Huahong Du, Kailin Li, Kaizhou Zheng, Yanmei Li
To evaluate the structural health condition of a long-span steel box girder cable-stayed bridge under complex environmental and traffic loading, this paper takes such a bridge as an engineering background. Based on the monitoring data from 2023 to 2025, the wavelet transform method is employed to separate the temperature effect and vehicle load effect from the deflection and strain monitoring data. The structural health condition of the bridge is systematically analyzed, thereby eliminating environmental interference from the structural health assessment. This study can provide both theoretical and practical references for the health monitoring of similar cable-stayed bridges.

A cam-driven tensegrity-based vibratory platform for directional part conveying

Hsieh, Wen-Hsiang — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 134-140.
Wen-Hsiang Hsieh, Hukamasidhi Yoel
This study presents a novel tensegrity-based vibratory conveying platform capable of transporting parts in specified directions. The proposed platform integrates a tensegrity structure with three cam-driven excitation mechanisms to generate controlled vibratory motions for directional part conveyance. First, the structural configuration and operating principle of the platform are described in detail. Subsequently, kinematic simulations are conducted to investigate the motion characteristics and verify the feasibility of the proposed design. To validate the simulation results, an experimental prototype is developed and tested under various directional conveying. Both simulation and experimental results demonstrate that the proposed platform can accurately convey parts along designated directions with satisfactory repeatability and accuracy.

Lightweight non-autoclaved foam concrete: effects of microsilica and microcalcite on structure and performance

Bekmirzayev, Diyorbek — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 279-286.
Diyorbek Bekmirzayev, Said Shaumarov, Vladimir Soy, Ne’matjon Mukhammadiyev, Gavkhar Nuriddinova, Nurali Khasanov
This study presents a lightweight non-autoclaved foam concrete with a target dry density of approximately 500 kg/m3 and improved compressive strength. The proposed composite binder system includes microsilica, microcalcite, and a polycarboxylate-based superplasticizer. The novelty lies in the combined use of microsilica and microcalcite as a dual modification system: microsilica promotes additional C-S-H formation and matrix densification, while microcalcite improves particle packing and stabilizes the closed-pore structure. After 28 days, the developed foam concrete achieved a dry density of 505±10 kg/m3, compressive strength of 4.6 MPa, thermal conductivity of 0.12 W/(m·K), water absorption of 18 %, and closed pore content of 82 %. The results indicate that the material is suitable for lightweight structural and thermal-insulating applications. Its reduced density is also beneficial for energy-efficient and seismic-resistant construction. A preliminary economic and environmental assessment indicates the potential advantages of the proposed composition.

Improving the isolation performance of seat suspension using negative stiffness cam-springs

Nguyen, Vanliem — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 205-211.
Vanliem Nguyen, Trungkien Nguyen, Tronghoan Nguyen, Haianh Pham
To further improve the isolation performance of the seat’s suspension system of vehicles, this study proposes a new design of the negative stiffness using two cam-springs (NS-CS). To clarify the isolation performance of NS-CS, two different structures of the seat’s traditional suspension (TS) and negative stiffness using the horizontal springs (NS-HS) are also used to compare the isolation performance between TS, NS-HS, and NS-CS. The performance indicators are evaluated through the seat’s acceleration in the time region and the seat’s power spectral density acceleration in the frequency region. The study shows that both these indices with NS-CS are lower than those of TS and NS-HS. Thus, the proposed NS-CS model improves driver’s comfort more than NS-HS.

Parametric analysis and stability study of narrow steel box girders based on Midas FEA

Chen, Gao — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 353-359.
Gao Chen, Jiayi Shen, Ze Liu, Zhaojian Hou, Yangyang Wen
To investigate the key parameters affecting narrow steel box girders, a Midas FEA model of a 40+60+40 m composite girder bridge was established, analyzing the effects of girder height, plate thickness, U-ribs, diaphragms, and stiffeners on deformation, stress, and buckling. Girder height dominates stiffness, reducing vertical displacement by 25.2 % from 1800 to 2600 mm. Diaphragms mainly improve buckling stability (+234.8 %); combining diaphragms, bottom stiffeners, and web stiffeners raises the critical load factor from 1.92 to 30.20. Buckling failure shifts from web to bottom plate to diaphragm with added reinforcements, suggesting a rational reinforcement sequence.

Numerical analysis of dynamic and energy characteristics of a six-solenoid double-mass vibratory lapping-polishing machine

Korendiy, Vitaliy — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 105-111.
Vitaliy Korendiy, Viktor Zakharov, Oleksandr Kachur, Ihor Laushnyk, Serhii Hrevtsov, Olga Levytska Revutska
A coupled electromechanical model is developed for a previously reported suspended double-mass vibratory lapping-polishing machine driven by six sequentially activated solenoids. The model combines the planar motion of the lap and carrier, elastic and dissipative forces, regularized dry-viscous contact friction, solenoid current transients, displacement-dependent inductance, and electromagnetic-force generation. Simulations were performed for excitation frequencies of 3-35 Hz and supply voltages of 8, 10, and 12 V. At 12 V and 8.5 Hz, the predicted relative trajectory radius is 0.217 mm, the peak current and electromagnetic force reach 1.89 A and 3.66 N, and the mean contact-dissipation power equals 23 mW. For the adopted solenoid parameters and switching law, the coupled model, unlike the prescribed-force benchmark, exhibits no pronounced resonance near the mechanical natural frequency because the shortened voltage pulses limit current build-up at high frequencies. The contact-power maxima occur at 5, 7, and 8.5 Hz for 8, 10, and 12 V, respectively. The results demonstrate that favorable operating regimes predicted by the model must be selected using coupled dynamic and energy criteria.

The mathematical model of the dynamic action of a controlled mechanical exciter of circular translational vibrations

Zhyhylii, Serhii — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 36-42.
Serhii Zhyhylii, Olha Harkava
The vibration exciter is a structural component of a vibration machine, regardless of its technological application, that determines the operating mode of the machine. This paper presents the structural design of a controlled mechanical exciter of circular translational vibrations equipped with two unbalanced shafts. The operating principle of the proposed exciter is described. A mathematical model of the dynamic action of the exciter on the processed medium is developed, defining the dependence of the generated excitation on the rotation angle of the movable unbalanced masses relative to their initial positions.

Considerations on the numerical and experimental investigation of attached-mass effects on a conical steel ultrasonic horn. A finite-difference, 2D/3D FEM and experimental FRF study

Roșca, Ioan Călin — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 43-49.
Ioan Călin Roșca, Camelia Cerbu, Vasile Năstăsescu
This study evaluates the effects of an attached mass on the dynamic response of a conical steel ultrasonic horn using a centered finite-difference scheme, axisymmetric 2D and full 3D ANSYS FEM models, and impact-hammer FRF testing. Modal and harmonic analyses compare the unloaded horn with the assembly comprising the screw, contacts, and mass. The added components shift the longitudinal resonance and redistribute displacement amplitude, producing detuning and modal-response redistribution rather than uniform attenuation.

Assessment of the influence of technological vibration on the technical condition of industrial building structures

Mykytenko, Serhii — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 160-168.
Serhii Mykytenko, Pavlo Mytrofanov
The long-term operation of industrial buildings housing technological equipment that generates dynamic loads requires the application of modern approaches to assessing the technical condition of load-bearing structures. Continuous exposure to vibration loads may lead to the gradual accumulation of damage, a reduction in the operational reliability of structures, and increased maintenance costs. In this context, vibration monitoring is increasingly regarded as one of the key tools of modern Structural Health Monitoring (SHM) systems, which enable the technical condition of engineering structures to be monitored throughout their service life.

Research and simulation of vibration transmission control in underwater drone engines

Kabi, Yelikbay — 2026-11-01T00:00:00Z

Vibroengineering Procedia, Vol. 64, 2026, p. 112-117.
Yelikbay Kabi, Yerdaulet Beibit, Gulzada Mussapirova, Alua Abdrashit, Akmaral Tlenshiyeva, Samat Kurmashev, Ruslan Kassym, Arai Tolegenova
This paper addresses the problem of vibration transmission from the propulsion system to the hull of unmanned underwater vehicles (UUVs), which is one of the primary sources of acoustic radiation and vehicle detectability. Conventional passive vibration isolation methods exhibit limited effectiveness in suppressing low-frequency vibrations generated by rotating machinery. To overcome this limitation, a compact hybrid active-passive vibration isolation mount is proposed, combining a rubber vibration isolator with piezoelectric actuators. To investigate vibration transmission characteristics, a coupled dynamic model of the “vibration source-isolation mount-hull” system was developed using the finite element method (FEM). The parameters of the passive isolator were determined based on stiffness requirements and finite element simulations, while active vibration suppression was implemented through a multichannel MIMO control system employing the adaptive filtered-x least mean squares (Fx-LMS) algorithm. The results demonstrate that the proposed active-passive isolation system effectively reduces vibration transmission within the frequency range of 10-500 Hz. A maximum vibration reduction of 26 dB was achieved, providing significantly better suppression of low-frequency vibrations than conventional passive isolation solutions. The proposed approach can be applied to enhance the acoustic stealth performance of unmanned underwater vehicles and other compact underwater platforms.

Vibration detection and feature extraction for bolt loosening of transmission tower

Ma, Jiangang — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 20-25.
Jiangang Ma, Yalin Zhao, Mingxin Geng, Lv Wang, Heye Xiao
Bolt connection failure of transmission towers poses threats to power grid operation safety. Aiming at the limitations of high cost and long cycle for full-scale tower tests, this paper takes a 330 kV dry-type terminal tower as the prototype and develops a 1:25 geometric scale-down test model with a height of 2.2 m according to similarity theory. Comparative tests on bolt loosening are carried out by active excitation via hammering the tower foot. Acceleration amplitude spectrum, sub-band energy ratio and spectral entropy are adopted to analyze vibration signals, so as to explore the variation rules of vibration response before and after bolt loosening. Different from acoustic-based methods that identify loose bolts through high-frequency radiation features and sound-source localization, this paper focuses on low-frequency modal-band vibration signals and realizes quantitative evaluation of the bolt-loosening state. The test results show that after bolt loosening, the spectral pattern within the 40-200 Hz band changes from “single-peak prominent type” to “multi-peak dispersed type”. The vibration amplitude of mid-low frequency rises, and vibration energy migrates from high-order modes to low-order modes. Both sub-band energy ratio and spectral entropy exhibit favorable channel consistency and damage discrimination capability, and can complement each other as quantitative detection indicators for tower bolt loosening. This research can provide experimental references for vibration-based detection of bolt loosening in transmission towers.

Detection and analysis of acoustic characteristics for loose bolts on transmission towers

Wang, Liang — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 40-44.
Liang Wang, Jiangang Ma, Zeyu Chen, Xiaochun Bai, Yuewei Wu
Transmission towers serve as critical components of power-transmission lines. Their structural integrity, inclination and other conditions are closely related to the safe operation of power-transmission lines. In engineering practice for loose-bolt detection on transmission towers, merely achieving qualitative judgment of “loose or not” cannot satisfy operation-and-maintenance requirements. It is essential to further locate the exact positions of loose bolts so that maintenance personnel can accurately identify hidden hazards. This paper proposes a two-level technical route of “feature extraction-sound source localization”. First, continuous knocking and steady-state excitation are adopted to trigger structural acoustic-vibration responses, and time-frequency features specific to bolt looseness are extracted. Then, beamforming-based sound-source localization technology using a microphone array is employed to precisely locate fault characteristic frequencies, so as to realize accurate positioning of loose bolts.

Resonance beyond mechanics: from Kazimieras Ragulskis’ Vibroengineering school to financial saturation theory

Girdzijauskas, Stasys A. — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 1-7.
Stasys A. Girdzijauskas
This paper examines the methodological relationship between the Vibroengineering School founded and scientifically led by Academician Kazimieras Ragulskis and Financial Saturation Theory (FST). Rather than transferring mechanical laws directly into economics, the study identifies structural parallels in nonlinear systems: nonlinearity, feedback, self-excitation, synchronization, resonance, and transitions between stable and unstable regimes. FST addresses a different class of systems but proposes a comparable qualitative mechanism: increasing saturation raises interaction density, strengthens feedback, and may generate synergy, self-synchronization, economic resonance, bifurcation, and financial instability. The paper adds a mathematical comparison of critical amplification based on the two response curves shown in Fig. 1. The saturation-productivity function and the normalized resonance-response function both exhibit square-root divergence as their respective normalized variables approach the critical boundary. Their leading critical exponent is therefore the same, although their coefficients, variables, and underlying mechanisms differ. This establishes an asymptotic structural correspondence, not dynamical isomorphism. The result refines the proposed methodological bridge and defines explicit limits on cross-disciplinary transfer. FST is presented as one possible interdisciplinary expression of a broader tradition of nonlinear systems thinking.

Speed and torque optimization of a crank-driven wheeled robot in non-impact and vibro-impact regimes

Korendiy, Vitaliy — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 26-32.
Vitaliy Korendiy, Oleksandr Kachur, Taras Vilchynskyi, Ihor Laushnyk, Roman Pelo, Inha Svidrak
A numerical design study compares a wheeled crank-driven robot in non-impact and compliant-impact operation under common drive-load constraints. Exact slider-crank kinematics, finite link inertia and a unilateral wheel constraint are retained in a coupled model. An energy balance bounds the attainable mean speed, while a constrained search adjusts internal mass, suspension stiffness and damping, crank radius, frequency and clearance. Six root-mean-square torque budgets define numerical approximations of the speed–torque trade-off. At a 0.20 N∙m budget, the best feasible solutions found achieve 0.4433 m/s without impacts and 0.5157 m/s with impacts, a 16.3 % increase. Their peak torques are 0.354 and 0.357 N∙m. However, positive shaft work per distance rises by 8.1 % in the impact solution. Thus, impacts improve attainable speed in the investigated domain without necessarily improving energy economy. The results are computational and conditional on stated contact, resistance and drive assumptions.

Orthogonal simulation study on bending stress of flexible rings in power slip rings

Li, Junye — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 60-65.
Junye Li, Zhaoxin Li, Mei Zhu, Zengwei Zhou, Guodong Ni, Nianhuan Li
The power slip ring is a core component for rotating electrical transmission in aerospace applications. Bending stress concentration in the flexible ring remains a critical bottleneck limiting service life, and quantitative characterization of stress sensitivity under multi-parameter coupling is lacking. Taking the maximum bending stress as the evaluation metric, an orthogonal numerical simulation was conducted. Three factors – the number of flexible rings/idler wheels, idler wheel radius, and rotational speed of the inner conductive ring – were selected, each with four levels. Range and variance analyses quantified the influence patterns. Results demonstrate that the idler wheel radius exerts a highly significant effect (P-value extremely small), while the number of flexible rings/idler wheels and rotational speed have relatively minor impacts. The idler wheel radius is identified as the primary control parameter for stress reduction, providing a quantitative basis for structural optimization and service life extension.

Field characterization of urban road traffic noise sources: effects of road class and vehicle composition

Zheng, Yuan — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 45-51.
Yuan Zheng, Wen Zhang, Chunzheng Liu, Ying Xu, Xiaogang Liu
Routine road traffic noise assessment describes the source by traffic volume, speed and vehicle-category shares, whereas monitoring usually reports a measured source-side level with a total vehicle count only, so that the operating conditions behind that level remain unidentified. This paper addresses that gap with a multi-city field study of 25 urban road sections in Guangzhou, China, covering four road classes and three operating periods. Each section-period was measured three times for 20 min with Class 1 instrumentation and counted by vehicle class, giving 75 observations analyzed with an explicit metrological and statistical treatment. Levels ranged from 58.5 to 79.8 dB(A); arterial sections alone spanned 15.0 dB(A) and night-time measurements 21.3 dB(A). Vehicle-class flow was more strongly associated with LAeq than average speed, medium-vehicle flow showing the strongest association (r= 0.867, 95 % CI 0.797-0.914). The expanded uncertainty of a single level was about 0.8 dB (k= 2). The results support recording vehicle-class counts alongside LAeq, so that a measured level can be attributed to traffic volume, fleet composition or both.

Working process technology for the replacement of continuous welded rails

Ergashev, Ulugbek — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 66-72.
Ulugbek Ergashev, Nodir Begmatov, Оleg Suslov
This paper presents an improved technology for the replacement of continuous welded rail strings using road-rail excavators equipped with dual-roller rail grippers. Existing methods for the installation and replacement of continuous welded rail strings are reviewed, and their shortcomings are identified, including limited productivity and the need for a significant amount of manual operations. The proposed technology makes it possible to replace rail strings without dismantling rail joints, to perform work at the optimal rail fastening temperature, and to reduce the risk of rail damage during handling and installation. The sequence of operations for the use of one, two, and four excavators is presented, and a comparative analysis of the effectiveness of each option is carried out. The results show that the proposed technology makes it possible to reduce the duration of work windows while simultaneously increasing the level of mechanization and improving the operational safety of continuous welded rail track maintenance.

Problems related to mathematical modeling of electromagnetic vibrators

Chelidze, Merab — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 8-12.
Merab Chelidze, Victor Zviadauri, Nana Dolidze, Mirian Tsotskalashvili
The article addresses the problems associated with the mathematical modeling of nonlinear electromagnetic vibrators. The presented paper demonstrates the reason that, for decades, has caused certain difficulties in providing a mathematically correct description of the excitation force generated by the half-wave-rectified alternating current resulting from the operation of a diode connected in series in the power supply circuit of electromagnetic vibrators. The paper also shows that for correct mathematical modeling, in the case of an electromagnetic vibrator powered by alternating current (without a diode), it is necessary to take into account the phase of π/2, i.e., instead of sin(ωt), should be used cos(ωt). Mathematical analysis of the equations describing the oscillations of a mechanical system and the driving force has also shown that a single equation can be successfully used instead of a system of two equations. Practical experience demonstrates that to accurately describe the dynamics of vibrating machines during various technological operations, it is necessary to model them as two-mass systems (rather than systems reduced to a single mass), while the technological process itself should be treated as a three-mass system.

Origin and development of vibrotechnologies for the aviation industry at the Lviv School named after Volodymyr Povidailo

Lanets, Oleksii — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 13-19.
Oleksii Lanets, Iryna Derevenko, Roman Kapalo, Ivan Kolodiy, Taras Svyshch, Lyudmyla Dziubyk
The article examines the origin and development of vibrotechnologies for the aviation industry within the Lviv school associated with Professor Volodymyr Povidailo. The historical contribution of this school to vibration engineering is outlined, with particular attention paid to the technologies and equipment developed at Lviv Polytechnic. The relevance of vibrotechnologies to aviation is considered in terms of their application in the strengthening, grinding, polishing, and processing of aircraft components made of titanium and high-strength aluminum alloys. The paper also highlights the potential of controlled vibration in the manufacture and assembly of composite structures, as well as in the vibration testing of aircraft components. Several vibration test stands are considered, including a non-resonant eccentric-pendulum stand, a resonant stand with a hydraulic coupling operating on the basis of the Sommerfeld effect, and an inter-resonant stand with an electromagnetic drive. Their structural principles and energy-efficiency advantages are discussed. The developments presented demonstrate the continuity of the Lviv school and its contribution to modern vibration technologies for aviation.

Numerical investigation of droplet deformation in contraction nozzles containing shear-thinning fluids

Baniabedalruhman, A. — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 52-59.
A. Baniabedalruhman
A droplet entering a contraction does not see the same flow conditions throughout its passage. Here, numerical calculations are used to follow this deformation and determine when breakup occurs for three continuous liquids: one Newtonian and two shear-thinning fluids. The incompressible two-phase problem is solved in OpenFOAM with a Volume-of-Fluid formulation and a modified interDyMFoam solver, while local mesh refinement follows the interface. The droplet is Newtonian. The other two liquids are represented by the Bird–Carreau model and have different high-shear viscosities. For each selected streamline, the initial radius is varied until the limiting size between an intact and a broken droplet is located; the corresponding critical capillary number is then evaluated. The calculations show that elongation is strong but short-lived near the contraction, whereas shear persists farther downstream. They also show why shear rate alone can be misleading for a shear-thinning liquid: close to the wall the shear rate may increase while the viscous stress decreases because apparent viscosity has fallen. Two breakup forms are obtained, namely filament fracture and tip streaming with satellite droplets. The critical radius decreases sharply from the inner trajectories toward the wall and changes little thereafter. The three liquids remain separated when the breakup data are compared using shear rate, but this separation is greatly reduced with a scaled downstream shear-stress coordinate. For the cases considered, the breakup limit therefore reflects the combined changes in deformation rate, apparent viscosity, viscous stress, and viscosity ratio.

Speed and torque optimization of a two-module vibration-driven system with unbalanced rotors

Korendiy, Vitaliy — 2026-11-02T00:00:00Z

Vibroengineering Procedia, Vol. 65, 2026, p. 33-39.
Vitaliy Korendiy, Maksym Pavlo Zelinskyi, Roman Litvin, Andriy Lisnichuk, Roman Palash, Serhij Nikipchuk
Selecting resonance parameters alone does not establish an efficient operating regime for a vibration-driven robot. This numerical study formulates the joint optimization of mean transport speed and combined root-mean-square drive torque for two sliding modules with unbalanced rotors. A hybrid dry-friction model includes normal-load modulation and inverse rotor torques. Analytical contact-capacity and torque bounds constrain six dimensionless design variables. A reproducible search is checked using an independent event-driven solver. For an illustrative 0.55 kg system, a 9 mN m torque-budget design increases mean speed from 0.0641 to 0.1336 m/s while reducing RMS torque by 14.3 %. The highest-speed design found reaches 0.4078 m/s at 30.95 mN m. The results distinguish contact admissibility, resonance tuning and drive loading; all reported gains concern the stated numerical model and parameter bounds.