Article
Engineering, Mechanical
Xi Wang, Dida Wang, Fei Li, Yang Zhang, Zhenyuan Xu, Tao Wang, Guoqiang Fu, Caijiang Lu
Summary: Variable vibration is difficult to control due to uncertainty and variability of vibration frequency. Traditional mathematical design methods for vibration absorbers decrease in efficiency when external vibration changes. A novel self-learning tuning method is proposed to suppress variable frequency vibration by utilizing experimental vibration data. Experimental results show improved vibration attenuation ratios for the designed absorbers in different axes and frequencies.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Ning Su, Jing Bian, Shitao Peng, Zhaoqing Chen, Yi Xia
Summary: In recent years, negative stiffness (NS) has been used in dynamic vibration absorbers (DVAs) to improve control performance on dynamic responses. However, the use of NS may increase static response. The optimal design of tuned mass damper with negative stiffness (NS-TMD) is investigated in this paper to address this issue and consider the impact of installation location on performance and design process. The proposed design method considers arbitrary installation locations and the balance of dynamic and static performances, leading to promising results in terms of control rates and weight reduction for slender structures.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Aerospace
Xinyu Lian, Huaxia Deng, Guanghui Han, Fan Jiang, Lei Zhu, Mingdong Shao, Xintong Liu, Rongchang Hu, Yuexiao Gao, Mengchao Ma, Xiang Zhong
Summary: This paper presents a low-frequency micro-vibration absorber with a designable nonlinear stiffness based on a beam. The material and dimension parameters of the beam's nonlinear characteristics are discussed using the finite element method (FEM). The designed micro-vibration absorber utilizes the nonlinear stiffness of the beam to achieve low-frequency vibration absorption and multiple working modes in different directions. The effects of structural parameters on the beam's stiffness characteristics are examined to explore its low-frequency performance. The results of FEM analysis are validated through vibration absorption experiments, and the effectiveness of the low-frequency vibration absorbers is confirmed through aerospace micro-vibration experiments.
AEROSPACE SCIENCE AND TECHNOLOGY
(2023)
Article
Acoustics
Junjie Yuan, Guoyong Jin, Tiangui Ye, Yukun Chen, Jinlin Bai
Summary: This paper proposes a novel axially magnetized negative stiffness module (MNSM) for high payload vibration isolation. By utilizing the concepts of modularity and expansibility, an axially magnetized negative stiffness unit (MNSU) is designed as the fundamental building block, which can be assembled into different units according to different requirements. Through analyzing the characteristics of the MNSU, two types of optimized units are obtained, and their design procedures are presented. The results of analyzing isolation systems with MNSMs under different nonlinearities and dynamic parameters indicate that the proposed MNSMs can provide a lower resonant frequency, a wider isolation frequency range, and a smaller transmissibility for the quasi-zero-stiffness vibration isolator.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Civil
Dida Wang, Xi Wang, Yang Zhang, Tao Wang, Guoqiang Fu, Caijiang Lu
Summary: This paper focuses on optimizing the parameters of an electromagnetic vibration absorber to control low and variable frequency vibrations, leading to improved performance. The simulations and experiments demonstrate the effectiveness of the optimized absorber in controlling vibrations within a wide low-frequency range.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Engineering, Mechanical
Kevin Dekemele, Giuseppe Habib, Mia Loccufier
Summary: Conventional nonlinear energy sinks (NES) are a robust alternative to linear vibration absorbers, with a larger efficient frequency bandwidth but limited efficiency for a small energy range. To overcome this, this paper proposes an unconventional stiffness characteristic to increase the energy bandwidth. Comparisons with traditional NES and TMD are made based on slow invariant manifolds, showing that the newly proposed NES can be robust regarding energy and frequency uncertainty.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Chemistry, Multidisciplinary
Marek Janusz Pluta, Daniel Tokarczyk, Jerzy Wiciak
Summary: This paper presents sound synthesis methods based on physical modelling using musical robots to address the issue of variability introduced by human operation of acoustic instruments. The repeatability and controllability of robots allow for studying and improving synthesis models to reproduce subtle phenomena in the final sound of an instrument.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Ning Su, Jing Bian, Zhaoqing Chen, Yi Xia
Summary: A novel Lever-type Inerter-based Vibration Absorber (LIVA) is proposed in this study, which is based on a lever supported on a flexible auxiliary structure connecting between the primary structure and a paralleled inerterdashpot system. The optimal parameters for the LIVA are derived based on analytical H infinity and H2 optimization. The influences of parameters on optimal parameters and control performance of the LIVA are systematically investigated. Furthermore, the vibration absorption performance of the LIVA is compared with traditional TMD and another lever-type vibration absorber through time domain analysis subjected to a recent earthquake event.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Zhao-Yang Xing, Xiao-Dong Yang
Summary: The vibration control performance of a combined vibration isolation system is investigated, which consists of a quasi-zero stiffness system and a linear dynamic vibration absorber. The dynamic equation is established and the amplitude-frequency response of the system is deduced and verified. The mechanism and tuning rule for the system are revealed, and the control performance is analyzed in terms of various factors. The results show that the system effectively suppresses vibration amplitude and broadens the isolation frequency band, providing valuable reference for improving control performance.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mathematics
Yuying Chen, Jing Li, Shaotao Zhu, Hongzhen Zhao
Summary: This study investigates the viscoelastic Maxwell-type DVA model with an inerter and multiple stiffness springs, using a combination of traditional theory and intelligent algorithms. By applying a fixed-point theory and particle swarm optimization (PSO) algorithm, the system parameters are optimized to minimize the maximum amplitude. The simulation results show that the presented DVA has better control performance compared to typical DVAs under random excitation. The intelligent algorithm also achieves resonance peak equalization, which is difficult to achieve with theoretical methods.
Article
Acoustics
Liting Wu, Kai Wang
Summary: This article investigates the parameter optimization problem for a novel inerter-based dynamic vibration absorber (IDVA) system with a grounded negative stiffness spring, which can be applied to many vibration control systems, such as building vibrations, bridge vibrations, vehicle suspensions, etc. The motion equations of the IDVA system are established based on Newton's second law, and the transfer function in the dimensionless form is derived. The system is optimized using the extended fixed-point method, and the analytical solutions of the optimal parameter values are derived.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Mechanical
Guilherme Rosa Franzini
Summary: Vortex-induced vibration (VIV) is a flow-induced vibration phenomenon of importance in offshore engineering. This study focuses on the numerical analysis of an elastic rotative nonlinear vibration absorber (ERNVA) for passive suppression of VIV, finding that ERNVA can significantly decrease oscillation amplitude and suppress VIV within a certain range of reduced velocities.
NONLINEAR DYNAMICS
(2021)
Article
Acoustics
Yiqing Yang, Haoyang Gao, Qiang Liu
Summary: This research focuses on the development of a slender turning cutting tool with a length-diameter ratio of 7, equipped with a vibration absorber using piezoelectric ceramic to achieve vibration suppression. The results demonstrate a significant reduction in vibration magnitude, validating the effectiveness of the vibration suppression system.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Engineering, Mechanical
Nicolas Broetz, Manuel Rexer, Niklas Puff, Peter F. Pelz
Summary: The Fluid Dynamic Vibration Absorber (FDVA) is a lightweight dynamic vibration absorber that uses translated fluid mass and coil springs to provide inductance and capacitance. This paper demonstrates that integrating FDVA into a damper's piston rod can reduce wheel load fluctuations in a passenger car. Experimental results from a quarter-car test rig show that the integrated FDVA provides 3.5% more comfort and 4.3% less wheel load fluctuation compared to a standard damper when subjected to a stochastic road profile.
VEHICLE SYSTEM DYNAMICS
(2023)
Article
Acoustics
Gianluca Gatti, Cesare Svelto
Summary: This paper presents a theoretical insight on the performance of a vibration isolator with a specific form of geometric nonlinearity. The analytical findings are validated by numerical simulations, providing useful guidelines for the design of such isolators.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Computer Science, Cybernetics
Muhammad Khurram Saleem, Cetin Yilmaz, Cagatay Basdogan
IEEE TRANSACTIONS ON HAPTICS
(2018)
Article
Engineering, Multidisciplinary
Akin Oktav, Cetin Yilmaz, Gunay Anlas
JOURNAL OF THE FACULTY OF ENGINEERING AND ARCHITECTURE OF GAZI UNIVERSITY
(2019)
Article
Acoustics
Adil Han Orta, Cetin Yilmaz
JOURNAL OF SOUND AND VIBRATION
(2019)
Article
Engineering, Mechanical
Akin Oktav, Vahab Hashemi Gavgani, Gunay Anlas, Cetin Yilmaz
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART D-JOURNAL OF AUTOMOBILE ENGINEERING
(2019)
Article
Mechanics
M. Umut Ozcan, Cetin Yilmaz, Fazil O. Sonmez
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Mechanics
Osman Yuksel, Cetin Yilmaz
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2020)
Article
Acoustics
Onur Ozyar, Cetin Yilmaz
Summary: This study describes a novel self-tuning adaptive-passive lever-type vibration isolation system for base excitations. The system adjusts the lever ratio to match the antiresonance frequency with the excitation frequency to suppress output vibration.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Acoustics
M. Utku Demir, Cetin Yilmaz
Summary: The aim of this study is to design a horizontal vibration isolation system with adjustable quasi-zero-stiffness along three axes. By placing a string in the central axis of the system and using a string tensioning mechanism, the horizontal stiffness of the elastic columns can be tuned, allowing for the adjustment of translational and torsional natural frequencies. Parametric studies and calculations are conducted to quantify the robustness and transmissibility of the system. The results show that by selecting the appropriate parameters, the system can achieve a very large isolation bandwidth at low frequencies.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Acoustics
M. Utku Demir, Cetin Yilmaz
Summary: This study introduces a modular vibration isolator design that allows the adjustment of horizontal stiffness in three axes by changing compressive forces on leg modules. The system utilizes a multi-string tensioning mechanism to change the axial compressive forces on all elastic stepped columns simultaneously. Experimental and modeling results show that the proposed isolator has a wide isolation bandwidth.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Civil
Ahmet Ata Kulaksizoglu, Cem Yalcin, Cetin Yilmaz
Summary: This article introduces a novel rotational friction damper that utilizes friction torques between steel plates and aluminum pads to enhance energy dissipation capacity of structures. The damper's motion amplification mechanism, achieved by a small initial angle, and the occurrence of friction damping in all joints of the mechanism are the main innovations. The proposed damper is particularly effective for joints with small gap openings and experiments have shown its satisfactory performance in force and energy dissipation capacities.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Sedef Nisan Otlu, Berkay Acar, Zafer Gokay Tetik, Cetin Yilmaz
Summary: The aim of this paper is to achieve an ultra-wide low-frequency stop band in three dimensions using inertial amplification mechanisms. The design of a two-stage remote center flexure mechanism is introduced to enable 3D assembly and bending of the mechanisms, effectively impeding broadband excitations from all directions. Cross flexure and split flat flexure hinges are utilized for the first time to maximize the stop band frequency range. By making design improvements and topological changes on the mechanisms forming the octahedron, the stop band is widened. The bandwidth is maximized by optimizing the thicknesses of the flexures in the inertial amplification mechanisms. Eventually, a 3D elastic metamaterial with an ultra-wide band gap between 33.7 Hz and 457.5 Hz is obtained, with an arithmetic mean normalized bandwidth of 172.6%.
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
(2023)
Article
Acoustics
Kamil Kocak, Cetin Yilmaz
Summary: This paper focuses on the design and analysis of a hybrid passive vibration isolation system that combines lever-type and quasi-zero-stiffness mechanisms. The lever-type mechanism generates an antiresonance frequency and increases the effective mass, improving low-frequency vibration isolation. The quasi-zero-stiffness mechanism provides very low stiffness, reducing the resonance and antiresonance frequencies of the system and significantly reducing the lower limit of the isolation bandwidth.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Computer Science, Cybernetics
Muhammad Khurram Saleem, Cetin Yilmaz, Cagatay Basdogan
IEEE TRANSACTIONS ON HAPTICS
(2020)
Proceedings Paper
Engineering, Electrical & Electronic
C. Yilmaz
2018 12TH INTERNATIONAL CONGRESS ON ARTIFICIAL MATERIALS FOR NOVEL WAVE PHENOMENA (METAMATERIALS)
(2018)
Proceedings Paper
Acoustics
Osman Yuksel, Cetin Yilmaz
PROCEEDINGS OF THE ASME INTERNATIONAL MECHANICAL ENGINEERING CONGRESS AND EXPOSITION, 2017 VOL 13
(2018)
Article
Acoustics
Sandip Chajjed, Mohammad Khalil, Dominique Poirel, Chris Pettit, Abhijit Sarkar
Summary: This paper reports the generalization of the Bayesian formulation of the flutter margin method, which improves the predictive performance by incorporating the joint prior of aeroelastic modal parameters. The improved algorithm reduces uncertainties in predicting flutter speed and can cut cost by reducing the number of flight tests.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pascal Zeise, Bernhard Schweizer
Summary: Air ring bearings are an improved version of classical air bearings, providing better damping behavior and allowing operation above the linear threshold speed of instability. However, there is a risk of dangerous vibrations in certain rotor systems, which can be addressed by considering ring tilting effects.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Zbynek Sika, Jan Krivosej, Tomas Vyhlidal
Summary: This paper presents a novel design of a compact six degrees of freedom active vibration absorber with six identical eigenfrequencies. The objective is to completely suppress the vibration of a machine structure with six motion components. By utilizing a Stewart platform structure equipped with six active legs, a spatial unifrequency absorber with six identical eigenfrequencies is achieved. The design is optimized using a correction feedback and active delayed resonator feedback.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kai Li, Yufeng Liu, Yuntong Dai, Yong Yu
Summary: This paper presents a novel light-powered self-oscillating liquid crystal elastomer (LCE) bow that can self-oscillate continuously and periodically under steady illumination. The dynamics of the LCE bow are theoretically investigated and numerical calculations predict its motion regimes. The suggested LCE bow offers potential advantages in terms of simple structure, customizable size, flexible regulation, and easy assembly.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Carmelo Rosario Vindigni, Giuseppe Mantegna, Calogero Orlando, Andrea Alaimo
Summary: In this study, a simple adaptive flutter suppression system is designed to increase the operative speed range of a wing-aileron aeroelastic plant. The system achieves almost strictly passivity by using a parallel feed-forward compensator implementation and the controller parameters are optimized using a population decline swarm optimization algorithm. Numerical simulations prove the effectiveness of the proposed simple adaptive flutter suppression architecture in different flight scenarios.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Nicco Ulbricht, Alain Boldini, Peng Zhang, Maurizio Porfiri
Summary: The quantification of fluid-structure interactions in marine structures is crucial for their design and optimization. In this study, an analytical solution for the free vibration of a bidirectional composite in contact with a fluid is proposed. By imposing continuity conditions and boundary conditions, the coupled fluid-structure problem is solved and applied to sandwich structures in naval construction, offering insights into the effects of water on mode shapes and through-the-thickness profiles of displacement and stress.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Shahram Hadian Jazi, Mostafa Hadian, Keivan Torabi
Summary: Non-uniformity and damage are the main focus in studying vibrations of beam elements. An exact closed-form explicit solution for the transverse displacement of a nonuniform multi-cracked beam is introduced using generalized functions and distributional derivative concepts. By introducing non-dimensional parameters, the motion equation and its closed-form solution are obtained based on four fundamental functions. The impact of crack count, location, intensity, and boundary conditions on natural frequency and mode shape is evaluated through numerical study.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Eugenio Tramacere, Marius Pakstys, Renato Galluzzi, Nicola Amati, Andrea Tonoli, Torbjoern A. Lembke
Summary: This paper proposes the experimental stabilization of electrodynamic maglev systems by means of passive components, providing key technological support for the Hyperloop concept of high-speed and sustainable transportation.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Pengfei Deng, Xing Tan, He Li
Summary: In this paper, the authors improve the surface morphology method and study the bit-rock interaction model between the rock and the PDC bit, taking into account the impact of blade shape and cutter arrangement. They establish a dynamic model for a deep drilling system equipped with an arbitrary shape PDC bit and propose a stability prediction method. The results show that the shape of the blades and arrangement of the cutters on the PDC bit significantly affect the nonlinear vibration of the drilling system.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Salvador Rodriguez-Blanco, Javier Gonzalez-Monge, Carlos Martel
Summary: In modern LPT designs, the simultaneous presence of forced response and flutter in different operation regimes is unavoidable. Recent evidence suggests that the traditional linear superposition method may be overly conservative. This study examines the flutter and forced response interaction in a realistic low pressure turbine rotor and confirms that the actual response is much smaller than that predicted by linear superposition.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Kabilan Baskaran, Nur Syafiqah Jamaluddin, Alper Celik, Djamel Rezgui, Mahdi Azarpeyvand
Summary: This study investigates the impact of the number of blades on the aeroacoustic characteristics and aerodynamic performance of propellers used in urban air mobility vehicles. The results show that different blade numbers exhibit distinct noise levels, providing valuable insights for further research on propeller noise and aerodynamic performance.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Yongbo Peng, Peifang Sun
Summary: This study focuses on the reliability-based design optimization (RBDO) of the tuned mass-damper-inerter (TMDI) system under non-stationary excitations. The performance of the optimized TMDI system is evaluated using probability density evolution analysis. The results demonstrate the technical advantages of TMDI, including high vibration mitigation performance, considerable mass reduction, and less stroke demand.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Guanfu Lin, Zhong-Rong Lu, Jike Liu, Li Wang
Summary: Vision-based measurement is an emerging method that enables full-field measurement with non-contact and high spatial resolution capabilities. This paper presents a single-camera method for measuring out-of-plane vibration of plate structures using motion-parametric homography to capture image variation and displacement response.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Bronislaw Czaplewski, Mateusz Bocian, John H. G. Macdonald
Summary: Despite two decades of study, there is currently no model that can quantitatively explain pedestrian-generated lateral forces. This research proposes a foot placement control law based on empirical data to calibrate and generalize the rigid-leg inverted pendulum model (IPM) for predicting lateral structural stability.
JOURNAL OF SOUND AND VIBRATION
(2024)
Article
Acoustics
Justine Carpentier, Jean-Hugh Thomas, Charles Pezerat
Summary: This paper proposes an improved method for the identification of vibration sources on a car window using the corrected force analysis technique. By redefining inverse methods in polar coordinates, more accurate results can be obtained.
JOURNAL OF SOUND AND VIBRATION
(2024)
