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Journal articles on the topic 'Degree of vibration'

Author: Grafiati

Published: 7 June 2025

Last updated: 2 August 2025

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1

Nishandar, Siddhanath, and A. S. N. Husainy. "Smart Vibration Control Systems: The Role of Digital Output in Advancing Two-Degree-of-Freedom Design." Asian Review of Mechanical Engineering 13, no. 2 (2024): 32–36. https://doi.org/10.70112/arme-2024.13.2.4279.

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This paper focuses on the development of a two-degree-of-freedom (2-DOF) vibration measurement system with digital output, designed for applications in mechanical engineering, structural health monitoring, and industrial processes. The primary objective is to design and implement a system that accurately measures and analyzes vibrations in two degrees of freedom, providing real-time digital insights for further analysis and decision-making. The system consists of a mechanical setup incorporating springs and dampers to simulate 2-DOF vibrations. Sensors are employed to detect vibrational respon

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2

Ikeda, Keigo, Kota Kamimori, Ikkei Kobayashi, et al. "Basic Study on Mechanical Vibration Suppression System Using 2-Degree-of-Freedom Vibration Analysis." Vibration 6, no. 2 (2023): 407–20. http://dx.doi.org/10.3390/vibration6020025.

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Mechanical vibrations adversely affect mechanical components, and in the worst case, lead to serious accidents by breaking themselves. To suppress vibrations, various studies have been conducted on vibration isolation, suppression, and resistance. In addition, technologies to actively suppress vibration have been rapidly developed in recent years, and it has been reported that vibrations can be suppressed with higher performance. However, these studies have been conducted mostly for low-order systems, and few studies have employed control models that consider the complex vibration characterist

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3

Xu, Shao Hua, Wen Cheng Cao, and Li Zeng. "Research on Dynamics Simulation of Moving and Stationary Vibration Screen." Applied Mechanics and Materials 415 (September 2013): 451–56. http://dx.doi.org/10.4028/www.scientific.net/amm.415.451.

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The vibrating modes of vibration screen box can be divided into single degree of freedom excitation and multiple degrees of freedom excitation. This paper puts forward the conception of multiple degrees of freedom excitation and sets up the dynamic equation of multiple degrees of freedom excitation vibration screen while the characteristics of one freedom vibration screen are summarized. Through the MATLAB programming language, using the four order Runge-Kutta method, we do a dynamics simulation research on an instance for this type of vibration screen, and analyze the characteristics of this

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Tolegenov, D. O., and I. M. Polyakova. "SINGLE-DEGREE-OF-FREEDOM VIBRATION ISOLATION SYSTEM WITH ONE ADDITIONAL SUPPORT." Bulletin of Kazakh Leading Academy of Architecture and Construction 92, no. 2 (2024): 164–75. http://dx.doi.org/10.51488/1680-080x/2024.2-12.

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Vibration isolation is one of the most effective methods for reducing vibration levels of supporting structures when installing vibroactive equipment (active vibration isolation) or vibration levels of vibro-sensitive objects relative to foundation vibration levels (passive vibration isolation). Damping devices utilizing high-speed fluid flow through apertures have found wide applications in shock vibration isolation and vibration isolation systems in aerospace and defense sectors. Recent research has led to the development of viscous fluid dampers (VFDs) for use in civil engineering, particul

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Babanov, S., and N. Tatarovskay. "Vibration disease: erectile dysfunction as a comorbidity problem." Sanitarnyj vrač (Sanitary Inspector), no. 6 (June 1, 2020): 36–43. http://dx.doi.org/10.33920/med-08-2006-04.

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The article presents data (based on a questionnaire survey) on the impact of vibration disease from the action of local and General vibration on the erectile function of men. The main changes in the parameters of erectile function (frequency, need, etc.) are described in the case of first and second-degree vibrational disease caused by local vibration, and in the case of first-and second-degree vibrational disease caused by General vibration based on data from a questionnaire survey of male patients and control group.

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Inoue, Masanobu, Isao Yokomichi, and Koju Hiraki. "Particle Damping with Granular Materials for Multi Degree of Freedom System." Shock and Vibration 18, no. 1-2 (2011): 245–56. http://dx.doi.org/10.1155/2011/309682.

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A particle damper consists of a bed of granular materials moving in cavities within a multi degree-of-freedom (MDOF) structure. This paper deals with the damping effects on forced vibrations of a MDOF structure provided with the vertical particle dampers. In the analysis, the particle bed is assumed to be a single mass, and the collisions between the granules and the cavities are completely inelastic, i.e., all energy dissipation mechanisms are wrapped into zero coefficient of restitution. To predict the particle damping effect, equations of motion are developed in terms of equivalent single d

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Susastro, Susastro, and Novi Indah Riani. "Pendekatan Eksperimen Karakteristik Respon Getaran Sistem Two Degree of Freedom dengan Penambahan Independent Dual Dynamic Vibration Absorber." R.E.M. (Rekayasa Energi Manufaktur) Jurnal 3, no. 2 (2019): 85. http://dx.doi.org/10.21070/r.e.m.v3i2.1729.

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Vibration is one of the problems that must be reduced in a vehicle. There are many ways to reduce vibration in vehicles, one of them is by adding Dynamic vibration absorber (DVA). While Dual Dynamic vibration absorber (dDVA) is a DVA period that is able to move in the translational direction given to the system to reduce translation vibration and when there is resonance. Translation DVA is an additional type of time used to reduce the vibration of the translation direction. So far there is not much research related to the use of translational DVA to reduce rotational vibrations as well as tran

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8

Dai, Pengyi, Shiyue Yang, Shuchen Ye, and Zhengheng Tang. "Dynamic Analysis and Vibrations Research on Multi-Degree of Freedom Shear Structures." Journal of Physics: Conference Series 2206, no. 1 (2022): 012008. http://dx.doi.org/10.1088/1742-6596/2206/1/012008.

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Abstract Vibration is everywhere in of our daily life. This paper studies the effect of rectangular pulse and free vibration on multi-degree of freedom systems. An undamped three-floor shear frame structure subjected to rectangular pulse and a damping three-floor shear building considered free vibration is investigated with respect to natural frequencies, mode shapes, and displacements of each floor level. This paper assumes the three-story shear building structure discussed has orthogonal damping, and the fundamental frequency will not change over time, which means that the mode shape of the

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9

Liang, Hongyu, Zhigang Wu, Jifeng Hu, Yuannan Gan, and Sheng Qiang. "Simulation Test of an Intelligent Vibration System for Concrete under Reinforcing Steel Mesh." Buildings 14, no. 8 (2024): 2277. http://dx.doi.org/10.3390/buildings14082277.

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Concrete vibration construction sustains high labor intensity, a poor working environment, difficulties in quality control, and other problems. Current research on concrete vibration focuses on monitoring vibration quality, evaluating vibration processes quantitatively, and assessing mechanical vibration of unreinforced mesh concrete (plain concrete). Standardizing concrete vibration under reinforcing steel mesh remains difficult. There is still a lag in the evaluation of the quality of rework and the consumption of human and material resources. To tackle these issues, a vibrating robotic arm

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10

Shan, Hongyu, Han-Cheng Dan, Shiping Wang, Zhi Zhang, and Renkun Zhang. "Investigation on dynamic response and compaction degree characterization of multi-layer asphalt pavement under vibration rolling." Electronic Research Archive 31, no. 4 (2023): 2230–51. http://dx.doi.org/10.3934/era.2023114.

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<abstract> <p>Asphalt mixture is composed of asphalt binder with aggregates of different sizes and compacted under static or dynamic forces. In practical engineering, compaction is a critical step in asphalt pavement construction to determine the quality and service life of pavement. Since the dynamic response characteristics of asphalt pavement can reflect the compaction state of asphalt mixture in the process of compaction, the establishment of the relationship between dynamic response characteristics and compaction degree is definitely significant. In this paper, a series of vib

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11

Trujillo-Franco, Luis Gerardo, Nestor Flores-Morita, Hugo Francisco Abundis-Fong, Francisco Beltran-Carbajal, Alejandro Enrique Dzul-Lopez, and Daniel Eduardo Rivera-Arreola. "Oscillation Attenuation in a Building-like Structure by Using a Flexible Vibration Absorber." Mathematics 10, no. 3 (2022): 289. http://dx.doi.org/10.3390/math10030289.

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This is a theoretical, numerical, and experimental study on the vibration attenuation capability of the dynamic response of a building-like structure using a dynamic vibration absorber in cantilever flexible beam configuration, taking into account gravitational effects associated with its mass. The dynamic model of the primary vibrating structure with the passive vibration control device is obtained using the Euler–Lagrange formulation considering the flexible vibration absorber as a generalized system of one degree of freedom. The application of the Hilbert transform to the frequency response

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12

Halkon, Benjamin J., Abdel Darwish, Steve Rothberg, Mahdi Mohammadi, and Sebastian Oberst. "Correction of scanning laser Doppler vibrometer measurements when subjected to six degree-of-freedom base motion." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A74. http://dx.doi.org/10.1121/10.0022844.

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Scanning laser Doppler vibrometer (SLDV) measurements are affected by sensor head vibrations as though they are vibrations of the target surface itself. Previous work has established a fully general theoretical analysis which shows that the only measurement required for measurement correction is of the vibration velocity at the incident point on the final steering mirror in the direction of the outgoing laser beam. Two practical—but not quite perfect—options for measurement correction were presented (one more suitable to manufacturer implementation, one more applicable to the vibration enginee

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13

Zhang, Lei, Xufeng Wang, Zhijun Niu, and Jianbo Dai. "Simulation Analysis of the Influence of Amplitude on Deformation and Fracture Characteristics of Hard Rock under Ultrasonic Vibration Load." Processes 12, no. 1 (2023): 74. http://dx.doi.org/10.3390/pr12010074.

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The utilization of auxiliary tools employing ultrasonic high-frequency vibration to enhance rock breaking efficiency holds significant potential for application in underground hard rock excavation engineering. To investigate the failure mechanism of rocks under high frequency ultrasonic vibration load, this study employs particle flow software PFC2D for numerical simulation. By incorporating boundary conditions from actual ultrasonic vibration rock breaking experiments and utilizing a parallel bond model to construct the rock, we analyze the deformation, damage, fracture, and energy evolution

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14

Mikhlin, Yuri V., and S. N. Reshetnikova. "Dynamical interaction of an elastic system and a vibro-impact absorber." Mathematical Problems in Engineering 2006 (2006): 1–15. http://dx.doi.org/10.1155/mpe/2006/37980.

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The nonlinear two-degree-of-freedom system under consideration consists of the linear oscillator with a relatively big mass, which is an approximation of some continuous elastic system, and of the vibro-impact oscillator with a relatively small mass, which is an absorber of the linear system vibrations. Analysis of nonlinear normal vibration modes shows that a stable localized vibration mode, which provides the vibration regime appropriate for the elastic vibration absorption, exists in a large region of the system parameters. In this regime, amplitudes of vibrations of the linear system are s

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15

Nikulina, S. A., A. V. Perminov, and T. P. Lyubimova. "Thermal vibrational convection of a pseudoplastic fluid in a rectangular cavity." Вестник Пермского университета. Физика, no. 3 (2020): 14–23. http://dx.doi.org/10.17072/1994-3598-2020-3-14-23.

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Thermal vibrational convection of a pseudoplastic fluid in a closed rectangular cavity, which is in zero gravity and performing longitudinal high-frequency linearly polarized vibrations, is studied. The temperature gradient is perpendicular to the direction of vibration. The system of equations of thermovibrational convection of a Williamson pseudoplastic fluid is given. The problem was solved by the finite difference method. The effect of vibrations on the structure and intensity of flows is investigated. The magnitude of the vibrational effect on the liquid was determined by the vibrational

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16

Yang, Yan, and Guanwei Luo. "Effects of Differently Located Clearance on the Dynamic Responses of a Two-Degree-of-Freedom Vibration System." Shock and Vibration 2021 (September 30, 2021): 1–18. http://dx.doi.org/10.1155/2021/1795675.

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The mechanical model of a two-degree-of-freedom forced harmonic vibration system with multiclearance rigid constraints is established, considering the location schemes of symmetrical both-sided clearance and asymmetrical multiple clearance. Existence domains, correlative distributions, and bifurcation scenarios of periodic vibrations are analyzed using multiparameter and multiperformance cosimulation. Pattern diversity, distribution, and occurrence mechanism of the subharmonic impact motion sequences in the tongue-shaped transition regions among the neighboring fundamental periodic motions of

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17

Gunawan, Gani. "Penyelesaian khusus persamaan diferensial biasa ordo dua linier tak homogen dengan koefisien konstan untuk fungsi bagian demi bagian." Majalah Ilmiah Matematika dan Statistika 24, no. 1 (2024): 1. http://dx.doi.org/10.19184/mims.v24i1.38240.

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Spring mechanical vibration motion system with a damped degree of freedom and influenced by external forces, is mathematically expressed as an ordinary differential equation of order of two linear constant coefficients that are not homogeneous. If an external force acts on a stationary system expressed as a continuous function f(t) for any time t, then the system will experience mechanical vibrational motion which mathematically the equation of motion can be expressed as a superposition. The equation consists of as a solution to a homogeneous form with mechanical vibrations as a solution to a

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18

Trtík, Tomáš, Roman Chylík, Josef Fládr, and Jitka Vašková. "The Analysis of the Intensity and Vibration Time on the Mechanical Properties of Hardened Concrete." Solid State Phenomena 322 (August 9, 2021): 28–34. http://dx.doi.org/10.4028/www.scientific.net/ssp.322.28.

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In order to achieve optimal physical and mechanical properties of hardened concrete, it is necessary to determine the right intensity and vibration time of fresh concrete during casting. Since concrete is considered as a polydisperse substance and various aggregate grains move randomly during vibration, it is very difficult to describe this stochastic phenomenon using exact physical equations and it is more advantageous to apply an experimental approach to verify the effects of vibration on fresh concrete. The effect of vibrations on fresh concrete increases the speed gradient of individual gr

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19

Xu, Jiaojiao, Tiantian Jing, Meng Fang, Pengcheng Li, and Zhong Tang. "Failure State Identification and Fault Diagnosis Method of Vibrating Screen Bolt Under Multiple Excitation of Combine Harvester." Agriculture 15, no. 5 (2025): 455. https://doi.org/10.3390/agriculture15050455.

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The demanding operational conditions of combine harvesters induce substantial vibrations and component degradation, significantly impacting harvesting efficiency, safety, and overall machine reliability. Bolt loosening, a critical failure mode at the joints of various working parts of combine harvesters, is a prevalent concern. The complexity and heterogeneity of vibration signals in these machines present a considerable challenge for the timely and accurate detection of bolt loosening. This paper proposes a novel methodology for identifying and diagnosing vibrating screen bolt failure states

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20

Budai, Csaba. "Vibrations in Single-Degrees-of-Freedom Sampled-Data Linear Mechanical Systems." Periodica Polytechnica Mechanical Engineering 66, no. 1 (2021): 90–98. http://dx.doi.org/10.3311/ppme.19150.

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This paper aims to present that the effect of sampling can result in multi-frequency vibration even in the case of a single-degree-of-freedom linear mechanical model. Even though the sampled-data systems have an infinite number of characteristic exponents due to sampling, the vibrations of these systems can still be characterized by an effective system model with a single dominant frequency. However, as this paper shows, additional harmonics become relevant, resulting in multi-frequency vibrations depending on the magnitude of applied control parameters. The vibrations presented by the time hi

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21

Shuai, Chang-geng, Bu-yun Li, Jian-guo Ma, and Zhao-hao Yang. "A Novel Low Stiffness Air Spring Vibration-Isolation Mounting System." Shock and Vibration 2022 (February 21, 2022): 1–11. http://dx.doi.org/10.1155/2022/5598689.

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Quasi-zero-stiffness (QZS) structures offer substantial practical benefits for facilitating the essential support and isolation of vibrational source loads aboard modern marine vessels. In order to design a compact QZS system of high bearing capacity, the article proposes a low stiffness air spring (LSAS) vibration-isolation mounting system composed of both vertical and lateral air springs. The vertical air springs support the load and isolate vibrations in the vertical direction, while the lateral air springs support the load and isolate transversal vibrations. Theoretical analyses based on a

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22

Tumakov, Sergey, and Grigoriy Golub. "Calculation of free vibrations frequencies of towers using Faddeev's and Krylov's methods." Smart composite in construction 6, no. 1 (2025): 8–20. https://doi.org/10.52957/2782-1919-2025-6-1-8-20.

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The paper considers the issue of dynamic calculation of free vibration frequencies for tower-type structures. The authors propose to use a scheme in the form of a discrete model with the replacement of distributed masses by concentrated masses when calculating a real continuum system. Spreadsheets were used to solve the problem of calculating natural vibration frequencies. The theoretical basis of the calculation includes a description of numerical methods for solving the determinant of the secular equation. The paper shows algorithms of computational operations for calculating free vibrations

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Zhu, Xuezhi, Zhaobo Chen, and Yinghou Jiao. "Optimizations of distributed dynamic vibration absorbers for suppressing vibrations in plates." Journal of Low Frequency Noise, Vibration and Active Control 37, no. 4 (2018): 1188–200. http://dx.doi.org/10.1177/1461348418794563.

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Dynamic vibration absorber is an ideal device for vibration control at specific frequencies. In order to get a robust vibration control performance, multiple or distributed dynamic vibration absorbers are usually used for suppressing vibrations in plate structures. Optimization methods for the single dynamic vibration absorber in various vibration systems had been proposed many years ago. However, the analytical optimization solutions with respect to the distributed dynamic vibration absorbers for the plate structures have not been found. In this paper, the optimization problems of the distrib

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Yao, Jinbao, Han Wu, and Shaoyin Tao. "Research on the Vibration Isolation Characteristics of Floor Vibration Isolation Slab System under Train Operation." Advances in Civil Engineering 2022 (September 12, 2022): 1–19. http://dx.doi.org/10.1155/2022/2976271.

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This study takes the vibration isolation measures of building floor vibrations induced by trains as the starting point and carries out both theoretical derivation and numerical simulation. A four-degree-of-freedom (DOF) multi-dimensional vibration isolation platform (VIP) dynamics model is established based on the theoretical research of single-level, single-degree-of-freedom vibration isolation systems. Under multi-point excitation, the model can deduce the horizontal and vertical vibration responses of the VIP system. A comprehensive analysis of the vibration isolation performance of the VIP

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25

Chen, Tingting, Kai Wang, Shengchao Chen, Ziyu Xu, Zhe Li, and Jiaxi Zhou. "Nonlinear electromechanical coupling dynamics of a two-degree-of-freedom hybrid energy harvester." Applied Mathematics and Mechanics 46, no. 6 (2025): 989–1010. https://doi.org/10.1007/s10483-025-3264-7.

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Abstract Vibration energy harvesting presents a significant opportunity for powering wireless sensor networks and internet of things (IoT) devices, offering a sustainable alternative to traditional battery-based power sources. However, environmental vibrations are predominantly low-frequency, which presents a significant challenge to the efficient conversion of such energy. To address this challenge, this paper proposes a novel two-degree-of-freedom (2-DOF) energy harvester. The first layer of the harvester incorporates a piezoelectric composite beam (PCB) paired with permanent magnets to form

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PORTER, MASON A., and RICHARD L. LIBOFF. "VIBRATING QUANTUM BILLIARDS ON RIEMANNIAN MANIFOLDS." International Journal of Bifurcation and Chaos 11, no. 09 (2001): 2305–15. http://dx.doi.org/10.1142/s0218127401003449.

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Quantum billiards provide an excellent forum for the analysis of quantum chaos. Toward this end, we consider quantum billiards with time-varying surfaces, which provide an important example of quantum chaos that does not require the semiclassical (ℏ → 0) or high quantum-number limits. We analyze vibrating quantum billiards using the framework of Riemannian geometry. First, we derive a theorem detailing necessary conditions for the existence of chaos in vibrating quantum billiards on Riemannian manifolds. Numerical observations suggest that these conditions are also sufficient. We prove the afo

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Heya, Akira, Ryosuke Nakamura, and Katsuhiro Hirata. "Development of Compact 3-Degree-of-Freedom Oscillatory Actuator." Journal of Robotics and Mechatronics 35, no. 5 (2023): 1312–20. http://dx.doi.org/10.20965/jrm.2023.p1312.

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Haptics applications are receiving increasing attention in entertainment, medical support systems, and various industries. Three-dimensional (3D) haptics is important to provide users real experiences. Conventional haptic devices consist of many motors and mechanical elements grounded in an environment. Therefore, they are large in size and heavy. Haptic devices using asymmetric vibrations can display illusion forces with mobile structures. However, they need additional structures (comprising actuators) to generate a 3D illusion force; however, the operational mechanism becomes complex. To sol

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He, Qing, Xinhua Mao, and Dongliang Chu. "Output Performance Analysis on a Two-degrees-of-Freedom Bistable Piezoelectric Vibration Generator." International Journal of Online Engineering (iJOE) 11, no. 6 (2015): 22. http://dx.doi.org/10.3991/ijoe.v11i6.5022.

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For harvesting the low-frequency and weak-amplitude vibration energy in real environment, a two-degrees-of-freedom bistable piezoelectric vibration generator is designed. And the dynamic model of the piezoelectric vibration generator system is established. And the influence of the external excitation on the output characteristics of the two-degree-freedom piezoelectric vibration generator system is simulated and analyzed. The results show that the two-degrees-of-freedom bistable piezoelectric vibration generator would do better in harvesting and converting for the low-frequency and weak-amplit

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Cheng, Xiaohan, Zongwu Li, Congjie Cao, Yazhou Wang, Nanqin Ding, and Guangqiang Wu. "Dynamic Analysis and Fault Diagnosis for Gear Transmission of a Vibration Exciter of a Mine-Used Vibrating Screen under Different Conditions." Applied Sciences 12, no. 24 (2022): 12970. http://dx.doi.org/10.3390/app122412970.

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The helical gear pair of a box-type vibration exciter of a mine-used linear vibrating screen is subjected to complex excitation and prone to broken tooth failures. At present, investigation regarding the difference and particularity between gear transmission in vibrating screens (i.e., vibration machinery) and that in rotating machinery is still a challenge, which is the key to revealing the performance and failure mechanism of gear transmission in the premise of application to vibrating screens. In order to intuitively display the peculiarity of gear transmission on the exciter, an innovative

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Su, Chengyun, Shuhan Wang, Yanfang Liu, Peng Dong, and Xiangyang Xu. "Coupled vibrations of a drive system during automatic transmission." Advances in Mechanical Engineering 11, no. 3 (2019): 168781401983350. http://dx.doi.org/10.1177/1687814019833508.

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Coupled vibrations are difficult to overcome in automatic transmission with mixed gear trains. In this study, a mathematical model for the bending–torsional–axial–oscillation vibrations of mixed gear trains with parallel-axis gear pairs, a clutch, planetary gear sets and a shaft rotor was developed using the concentrated mass method. The dynamic vibration response and transmission error of the meshing gears in different gears were analysed. The response sensitivity of the vibration parameters was obtained using the design coupling function of the peak–peak dynamic transmission error. The degre

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Abu-Hilal, Mohammed. "Fixed Points of Two-Degree of Freedom Systems." Shock and Vibration 5, no. 3 (1998): 199–205. http://dx.doi.org/10.1155/1998/379521.

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The presence of fixed points in a frequency response of vibrating systems can greatly complicate the vibration reduction if these points are not recognized. In this paper, the fixed points of two-degree of freedom systems are studied. The frequencies at which fixed points occur and their amplitudes are determined analytically.In this paper, the fixed points of two-degree of freedom systems are studied. The frequencies at which fixed points occur and their amplitudes are determined analytically.

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Savaşaneril, Nurcan Baykuş. "Lucas Polynomial Solution of the Single Degree of Freedom System." Scientific Research Communications 3, no. 1 (2023): 1–10. http://dx.doi.org/10.52460/src.2023.002.

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Free vibration of a single degree of freedom system is a fundamental topic in mechanical vibrations. The present study introduces a novel and simple numerical method for the solution of this system in terms of Lucas polynomials in the matrix form. Particular and general solutions of the differential equation can be determined by this method. The method is illustrated by a numerical application and the results obtained are compared with those of the exact solution.

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Mohammed, Sufyan A., Nouby M. Ghazaly, and Jamil Abdo. "Fault Diagnosis of Crack on Gearbox Using Vibration-Based Approaches." Symmetry 14, no. 2 (2022): 417. http://dx.doi.org/10.3390/sym14020417.

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This study experimentally investigates vibration-based approaches for fault diagnosis of automotive gearboxes. The primary objective is to identify methods that can detect gear-tooth cracks, a common fault in gearboxes. Vibrational signals were supervised on a gearbox test rig under different operating conditions of gears with three symmetrical crack depths (1, 2, and 3 mm). The severity of the gear-tooth cracks was predicted from the vibrational signal dataset using an artificial feedforward multilayer neural network with backpropagation (NNBP). The vibration amplitudes were the greatest when

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Abu Seer, Taher, Nader Vahdati, and Oleg Shiryayev. "Adaptive Torsional Tuned Vibration Absorber for Rotary Equipment." Vibration 2, no. 1 (2019): 116–34. http://dx.doi.org/10.3390/vibration2010008.

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This paper proposes an innovative solution to suppress torsional vibrations in any rotating machinery with a variable frequency of excitation, or a variable natural frequency. The adaptive torsional tuned vibration absorber (ATTVA) was designed using an integrated electromagnetic circuit, which can adapt its natural frequency to match the varying natural frequency of any Multi Degree of Freedom (MDOF) rotating system. A two degree of freedom rotating system was modeled along with the integrated ATTVA using the bond graph modeling technique. Simulation results showed that torsional vibrations c

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Liu, Shuai. "Analysis of contribution degree of vibration transmission of bolted structure." Journal of the Acoustical Society of America 154, no. 4_supplement (2023): A37. http://dx.doi.org/10.1121/10.0022720.

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In practical engineering, the vibration transmission between bolted structures supported by cantilever beams involves many factors. The vibration transmission effect is the embodiment of the coupling of various factors, so it is impossible to accurately and quantitatively evaluate the influence degree of various factors. In this paper, the influence factors of vibration between bolted plates in the form of cantilever beam are studied by numerical calculation method. The effects of friction coefficient, bolt preload, temperature and pressure on vibration characteristics are studied. Finally, th

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Smirnov, V. A. "Protection of Bearing Structures of Buildings Against the Influence of Vibration Generated by Railway Transport." Zhilishchnoe Stroitel'stvo, no. 12 (2020): 40–46. http://dx.doi.org/10.31659/0044-4472-2020-12-40-46.

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Currently, the railway network is widely developed, many of which pass through settlements and cities; in some proximity to buildings, including high-rise buildings. The movement of trains on the track causes a certain level of vibrations that are transmitted through the ground to nearby buildings, and cause vibrations of various structures. In this regard, when designing railway tracks or constructing buildings in some proximity to railways, it is necessary to assess the possible vibration impact of rail transport on structures at the design stage and, if necessary, provide measures to protec

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Huang, Min Yuan. "Multi-Degree of Freedom Vibration Theory and Engineering Application." Advanced Materials Research 250-253 (May 2011): 2473–76. http://dx.doi.org/10.4028/www.scientific.net/amr.250-253.2473.

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Regarding the multi-degree of freedom as the research object, we study vibration theory and engineering application of the multi-degree of freedom. Main content as follows: When establishing vibration system model, we deal with the structure’s discretization and the motion simulation, as well as simplify the foundation model and other issues. The establishment of vibration motion equation must combine with the specific situation and ensure the accuracy of equation, so that we can achieve the best equation of engineering fitting. Harm treatment of engineering vibration is the key to enhance str

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Zhang, Yang, Weiwei Fu, and Lijun Wang. "Modeling analysis of a novel hybrid 6-DOF vibration isolation platform for sensitive instruments." Journal of Physics: Conference Series 2383, no. 1 (2022): 012146. http://dx.doi.org/10.1088/1742-6596/2383/1/012146.

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The inevitable vibration caused by normal operation of the spacecraft in orbit will interfere sensitive instruments, such as space telescope, reconnaissance camera, space interferometer. Serious vibrations affect the accuracy and reliability of the sensitive instruments, even cause flight mission failed. This paper presents a hybrid 6-DOF vibration isolation platform (HVIP) with six degree-of-freedom for active vibration isolation of the space sensitive instruments. The HVIP is composed of three orthogonal vibration isolation module, which composed of the active piezoelectric actuator and pass

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Haddad, Wassim M., and Ali Razavi. "H 2, Mixed H2/H∞ and H2/L1 Optimally Tuned Passive Isolators and Absorbers." Journal of Dynamic Systems, Measurement, and Control 120, no. 2 (1998): 282–87. http://dx.doi.org/10.1115/1.2802420.

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In many practical applications, unbalanced rotating machinery cause vibrations that transmit large oscillatory forces to the system foundation. Using ad hoc optimization schemes tuned isolators and absorbers have traditionally been designed to suppress system vibration levels by attempting to minimize the peak frequency response of the force/displacement transmissibility system transfer function. In this paper, we formulate the classical isolator and absorber vibration suppression problems in terms of modern system theoretic criteria involving H2 (shock response), mixed H2/H∞ (worst-case peak

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Simmons, H. R., and A. J. Smalley. "Effective Tools for Diagnosing Elusive Turbomachinery Dynamics Problems in the Field." Journal of Engineering for Gas Turbines and Power 112, no. 4 (1990): 470–77. http://dx.doi.org/10.1115/1.2906191.

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This paper describes and discusses techniques that can effectively diagnose dynamics problems in turbomachinery. A variety of elusive dynamics problems are identified that require definition, quantification, diagnosis, and monitoring. The state of the art in measurement and signal processing techniques is discussed with reference to such factors as the directness of the measurement, the degree of intrusion required, the difficulty of installation, and the reliability or durability of the sensor. Several examples of techniques are provided that have proved to be effective in diagnosing elusive

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Gerike, Boris, Aleksandr Zacharov, Pavel Gerike, and Yuriy Drozdenko. "Problems of Operational Safety of Dump Trucks in Open Pit Mine." E3S Web of Conferences 134 (2019): 01005. http://dx.doi.org/10.1051/e3sconf/201913401005.

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One of the risk factors for dump trucks drivers is the over-vibration on various parts and control units. This leads to the formation of high intensity of work. To search for the causes of over-vibration it is proposed to use vibration analysis methods. To search for the causes of over-vibration it is proposed to use vibration analysis methods in time when dump truck is not moving. This allows the escaping the influence of external factors such as like profile of the road, slope, etc. The analysis of the vibrational signal spectrum allows determining the type of defect with a high degree of re

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Hoffman, D. M. W., and D. R. Dowling. "Fully Coupled Rigid Internal Combustion Engine Dynamics and Vibration—Part I: Model Development." Journal of Engineering for Gas Turbines and Power 123, no. 3 (2001): 677–84. http://dx.doi.org/10.1115/1.1370399.

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Robust predictions of engine vibration are important for preliminary design of new engines and new vehicles, and in setting component tolerances. Vibration modeling of internal combustion engines is commonly based on a one-way-coupling assumption between the engine’s moving internal components and the vibrating engine block. This assumption causes Coriolis and gyroscopic interactions to be neglected, and leads to a vibration model that does not properly conserve energy. This paper presents a new seven-degree-of-freedom model for low frequency engine vibrations that does not utilize the one-way

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Zhen, Bin, Wenbang Qi, and Liang Chang. "Dynamic Analysis for Lateral Vibrations of Footbridges under Crowd Based on a Two-Degrees-of-Freedom Model." Mathematical Problems in Engineering 2019 (February 18, 2019): 1–11. http://dx.doi.org/10.1155/2019/7452573.

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Nakamura’s model is widely used to describe lateral vibrations of a footbridge induced by crowd. The predicted responses of Nakamura’s model were compared with measured data of T-bridge and M-bridge in Japan to demonstrate the validity. However, the predicted responses based on Nakamura’s model almost always were stronger than measured data. Considering that both T-bridge and M-bridge are cable-stayed bridges, it seems to be not precise enough to simplify a cable-stayed bridge as a single degree of freedom system in Nakamura’s model. In this paper, we establish a two-degrees-of-freedom model t

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Wu, Yipeng, Hongli Ji, Jinhao Qiu, Weiqun Liu, and Jinling Zhao. "An internal resonance based frequency up-converting energy harvester." Journal of Intelligent Material Systems and Structures 29, no. 13 (2018): 2766–81. http://dx.doi.org/10.1177/1045389x18778370.

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Frequency up-converting vibration energy harvester can bridge the gap between high-frequency response and low-frequency input, greatly increasing the efficiency of energy conversion. This article proposed a novel frequency up-converting energy harvester based on 1:3 internal resonance in 2 degree-of-freedom cubic nonlinear systems. The harvester consists of two asymmetric cantilevers corresponding to two vibration degrees-of-freedom. The ratio of cantilevers’ first-order resonances is (or close to) 1:3. When excited frequency matches the resonant frequency of the first assisting cantilever, 1:

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Yuan, Xing-Hua, Yu-Ling He, Man-Yu Liu, Hui Wang, Shu-Ting Wan, and Gaurang Vakil. "Impact of the Field Winding Interturn Short-Circuit Position on Rotor Vibration Properties in Synchronous Generators." Mathematical Problems in Engineering 2021 (November 30, 2021): 1–11. http://dx.doi.org/10.1155/2021/9236726.

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This paper investigates the effect of the field winding interturn short-circuit (FWISC) position on the rotor vibration properties in turbo generators. Different from the previous studies which focused on the influence of the short-circuit degree, this work pays much attention to the impact of the short-circuit position on the rotor unbalanced magnetic pull (UMP) properties and vibration characteristics. The theoretical UMP model is firstly deduced based on the analysis of the magnetic flux density (MFD) variation. Then, the finite element analysis (FEA) is performed to calculate the UMP data.

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Zhang, Tianxiao, and Nong Zhang. "Vibration Modes and the Dynamic Behaviour of a Hydraulic Plunger Pump." Shock and Vibration 2016 (2016): 1–7. http://dx.doi.org/10.1155/2016/9679542.

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Mechanical vibrations and flow fluctuation give rise to complex interactive vibration mechanisms in hydraulic pumps. The working conditions for a hydraulic pump are therefore required to be improved in the design stage or as early as possible. Considering the structural features, parameters, and operating environment of a hydraulic plunger pump, the vibration modes for two-degree-of-freedom system were established by using vibration theory and hydraulic technology. Afterwards, the analytical form of the natural frequency and the numerical solution of the steady-state response were deduced for

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Mohamed, Khaled Saad, Fatin Amri, Mostafa Mohamed Elboraey, N. H. Diyana Nordin, and Asan Gani Abdul Muthalif. "Adaptive Electromagnetic Vibration Absorber for a Multimode Structure." Strojniški vestnik - Journal of Mechanical Engineering 68, no. 3 (2022): 191–99. http://dx.doi.org/10.5545/sv-jme.2021.7458.

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All structures experience vibrations due to external dynamic force excitations, such as earthquakes and wind loadings. At resonance, the impact of this natural dynamic force on structures may lead to structural failures. Hence, an absorber is mounted to absorb vibrations from the primary system. Unfortunately, passive tuned mass absorbers can only target a single frequency. Since structural buildings possess multiple modes, an adaptive or tune-able vibration absorber is needed to attenuate the vibration in a multi-degree of freedom (MDOF) system. In this work, an adaptive electromagnetic vibra

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Wang, Shang, Pengfei Chai, Zhicheng Xiao, Jie Tian, Yong Chen, and Hua Ouyang. "Parameter identifications of synchronous vibration of rotating blades with large amplitude based on blade tip timing." Journal of the Global Power and Propulsion Society 8 (April 1, 2024): 39–51. http://dx.doi.org/10.33737/jgpps/184213.

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Blade Tip Timing (BTT) is a promising method to measure the vibration of rotating blades by installing probes on the casing. The Zablotsky-Korostelev Single Parameter Technique (SPT) is widely used to identify the vibrational characteristics of blade synchronous responses. This method assumes that the influence of blade’s own vibration on arrival time can be neglected. However, it is reported that vibrations of rotating blades with large amplitudes will cause errors in identifying maximum vibration amplitude because of the above-mentioned assumption. In this paper, we derived a mathematical mo

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Sun, Qian, Yongpeng Wen, and Yu Zou. "Study on the Vibration Suppression Method of Urban Railway Vehicles Based on a Composite Dynamic Vibration Absorber." MATEC Web of Conferences 296 (2019): 01010. http://dx.doi.org/10.1051/matecconf/201929601010.

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To reduce the bounce and the pitch vibration of carbody, a vertical dynamic model for urban rail vehicles is established to analyze the vibration response of the carbody in the low frequency range. In this paper, different methods of single-degree-of-freedom dynamic vibration absorber to suppress the vibration for carbody are investigated. The limits of single-degree-of-freedom dynamic vibration absorber to the vibration reduction effect of carbody are pointed out. After that, the design of a composite dynamic vibration absorber including a double oscillator structure is introduced. A vibratio

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Lin, Shueei Muh. "Nonlinear Vibration Control of a Multi-Degree-of-Freedom Structure." Applied Mechanics and Materials 311 (February 2013): 105–10. http://dx.doi.org/10.4028/www.scientific.net/amm.311.105.

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In this study, the nonlinear vibration model of structure with cross support is established. The conventional structure without cross support is linear and easy to be investigated. Unfortunately, its dynamic stability and vibration due to earthquake excitation are usually not acceptable. For suppressing the structural vibration the cross support composed of the elastic connecting bar and damper is considered here. This is a passive control design. Beside, due to the supporting arrangement, the mathematical model of the structure is highly nonlinear. In this study, the analytical solution for t

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