Article
Mathematics
Luis Gerardo Trujillo-Franco, Nestor Flores-Morita, Hugo Francisco Abundis-Fong, Francisco Beltran-Carbajal, Alejandro Enrique Dzul-Lopez, Daniel Eduardo Rivera-Arreola
Summary: This study investigates the vibration attenuation capability of a building-like structure using a dynamic vibration absorber in cantilever flexible beam configuration. The effects of gravity are taken into account. The study proposes the use of the Hilbert transform to determine the tuning conditions between the vibration absorber and the primary system. The results show that the nonlinearities in the dynamic model do not significantly affect the performance of the absorber.
Article
Engineering, Mechanical
Javier Picavea, Andres Gameros, Jian Yang, Dragos Axinte
Summary: This paper presents the vibration attenuation capabilities of tuneable flexures and proposes a modeling approach to construct flexures tuned to match the frequency of excitation, thus reducing vibration levels. The experimental results show a substantial reduction in vibration response of the workpiece. The proposed model provides a new avenue for the design of fixtures with vibration absorption capabilities.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Mathematics
Francisco Beltran-Carbajal, Hugo Francisco Abundis-Fong, Luis Gerardo Trujillo-Franco, Hugo Yanez-Badillo, Antonio Favela-Contreras, Eduardo Campos-Mercado
Summary: This article addresses the online frequency estimation of forced harmonic vibrations on a building-like structure, using a nonlinear flexible vibration absorber. It presents algebraic formulae to compute the harmonic excitation frequency on the nonlinear vibrating mechanical system using solely available measurement signals. The fast algebraic frequency estimation allows the online tuning of a semi-active dynamic vibration absorber to achieve a high attenuation level of undesirable vibrations.
Article
Acoustics
Keisuke Yamada, Toshihiko Asami
Summary: This paper presents a piezoelectric two-degree-of-freedom vibration absorber and provides theoretical analysis and experimental verification of its effectiveness.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Mechanics
Vinicius Piccirillo
Summary: This paper proposes a nonfeedback control method using a linear vibration absorber to suppress chaotic responses of nonlinear oscillators. Theoretical results show that adjusting the ratio of natural frequencies between the oscillator and the absorber can drive chaotic behavior to a stable equilibrium point. Numerical results demonstrate that tuning the ratio close to the excitation frequency can drive chaotic responses to periodic orbits in some cases, but taking into account the excitation amplitude is also necessary for periodic responses.
Article
Mechanics
Marcell Bartos, Giuseppe Habib
Summary: Hybrid vibration absorbers (HVAs) are an effective solution for vibration mitigation, combining the mechanisms of tuned mass dampers (TMDs) and feedback-controlled actuators. This study evaluates the vibration suppression capabilities of HVAs against self-excited oscillations and improves system performance through parameter optimization.
Article
Engineering, Mechanical
Giuseppe Habib, Alberto Epasto
Summary: This study addresses the implementation of the nonlinear tuned vibration absorber (NLTVA) to suppress shimmy vibration in towed wheels. By adopting a modified straight tangent tire model, stability analysis showed that the NLTVA improves the wheel's equilibrium stability significantly. Bifurcation analysis revealed large bistable regions threatening system safety, but adding intentional softening nonlinearity in the absorber restoring force characteristic eradicates these regions and reduces shimmy oscillation amplitude in the unstable region. Quasiperiodic motions were also identified, but their practical relevance seems marginal.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Caihong Huang, Jing Zeng
Summary: A novel method of suppressing flexible carbody resonance by hanging a DVA on the bogie frame is proposed, with experimental and theoretical analysis confirming its effectiveness in changing the bogie hunting frequency and suppressing resonance.
VEHICLE SYSTEM DYNAMICS
(2022)
Article
Engineering, Ocean
Nur Ain Shafiza Ramzi, Lee Kee Quen, Hidetaka Senga, Hooi-Siang Kang, Meng Hee Lim, Noor Idora Mohd Sukarnoor
Summary: This study experimentally investigated the impact of different parameters of a shroud on the vortex-induced vibration (VIV) and mean drag coefficient of an oscillating cylinder. The results showed that a shroud with specific parameters can reduce the vibration amplitude without increasing the mean drag coefficient.
APPLIED OCEAN RESEARCH
(2022)
Article
Instruments & Instrumentation
Wei Zhao, Wei Tian, Peng Liu, Bo Li
Summary: This paper proposes a snubber design using an intelligent material called magneto-rheological elastomer (MRE) combined with the principle of vibration absorption to suppress forced vibration during robotic milling. Experimental results show that the MRE absorber effectively reduces vibration acceleration responses and achieves certain vibration absorption effects in milling experiments. It also decreases the surface roughness of the workpiece, providing support for engineering applications in the field of robotic milling.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Civil
Sam Fallahpasand, Morteza Dardel, Mohammad Hadi Pashaei
Summary: In this research, a tracking vibration absorber is proposed to improve the design of ordinary pendulum vibration absorbers. The model utilizes a curved surface to enhance the robustness of the absorbers. By introducing a compound objective function, the gravitational dynamic vibration absorbers can adapt to a wide range of harmonic excitation circumstances. Analytical solutions and numerical optimizations are performed to assess the performance and behavior of this model.
Article
Engineering, Mechanical
Fan Liu, Yan Zhao
Summary: This paper introduces a new method for analyzing stationary random vibration of structures with uncertain parameters. The method involves polynomial decomposition and Fourier-polynomial expansion of component functions to calculate the PSD of random structural responses efficiently. The use of dimension-reduction integration and Gaussian numerical integration methods helps reduce the computational efforts required for calculating the coefficients.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Acoustics
Haining Sun, Xiaoqiang Tang, Senhao Hou, Xiaoyu Wang
Summary: This article proposes two active control methods, fuzzy-proportional integral derivative control and deep reinforcement learning, to suppress vibrations of flexible structures with small controllable force. Inspired by the output law of DRL, a new control method named Tang and Sun control is innovatively presented based on the Lyapunov theory. Numerical simulations validate the effectiveness of these control methods in suppressing vibrations.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Acoustics
Chaowu Jin, Yue Dong, Xudong Guan, Jin Zhou, Fan Wang
Summary: This article introduces the design and experimental research of a magnetic suspension dynamic vibration absorber. By establishing a theoretical model, designing a specific structure, conducting simulation studies, and experimental verification, it is found that the magnetic suspension dynamic vibration absorber can effectively reduce vibration within a certain frequency range.
JOURNAL OF VIBRATION AND CONTROL
(2021)
Article
Mechanics
Zhou Jian, Xu Minglong, Yang Zhichun, Gu Yingsong
Summary: This study focuses on using NVA to suppress the nonlinear response of panel flutter in supersonic airflow. The effects of NVA parameters on flutter boundaries and suppression regions are examined, leading to the development of a design technique for finding suitable parameter values to suppress nonlinear panel flutter response.
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2021)
Article
Engineering, Multidisciplinary
Biao Xiang, Waion Wong
Summary: This paper introduces the active magnetic bearing system of magnetically suspended flywheel energy storage system and the power supply issue, as well as the role of the off-board power supply system. The off-board power supply system can maintain the stable suspension of the flywheel rotor and achieve dynamic braking in case of the on-board power supply system failure.
Article
Acoustics
Biao Xiang, Waion Wong
Summary: The control performance of magnetically suspended motor with heavy self-weight and great moment of inertia is affected by parameter uncertainty and external disturbances. The coupling effect in radial tilting becomes serious with the increase of rotational speed and moment of inertia, reducing the robustness. An internal model control model is proposed to enhance the robust stability of the magnetically suspended motor.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Engineering, Mechanical
Biao Xiang, Qingyuan Guo, Waion Wong
Summary: The electrostatic suspension system is a contactless detective method to analyze the material properties of test samples, with suspension precision in the vertical direction being sensitive to disturbances. To improve the stability of test samples and reduce oscillation amplitudes, an active disturbance rejection control (ADRC) model has been designed.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Automation & Control Systems
Biao Xiang, Waion Wong
Summary: This article investigates the rotating characteristic and stability of unsymmetrical magnetically suspended motor (MSM). The dynamic functions and stability criterion are developed, and the proposed analysis method is validated through experiments.
Article
Mechanics
Yingyu Hua, Emiliano Rustighi, Li Cheng, Waion Wong
Summary: The research investigates the dynamic characteristics of a slanted beam termination (SBT) and explores its applications in energy conversion and vibration control. By comparing the waveguides distribution and point impedance, the study highlights the flexibility and advantages of the slanted beam termination over traditional methods.
Article
Acoustics
Chen Mao, Wai On Wong, Li Cheng
Summary: In this research, it is proven that the high-order cross-modal energy densities of a linear dynamic structure are highly correlated to the location of the external exciting force. Based on this finding, a new force localization method is proposed and tested on vibrating beam structures. The proposed force localization method works well according to numerical tests and experiments.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Acoustics
Ruqi Sun, Waion Wong, Li Cheng
Summary: This paper proposes a hybrid tunable damper that combines the advantages of both Coulomb friction damping and electromagnetic shunt damping to achieve a wider range and higher precision of tunable frequency range.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Biao Xiang, Zhongbo Li, Waion Wong
Summary: This article proposes an identification method for the displacement and current stiffnesses of the MSFW rotor, based on its dynamic displacement and control current. It establishes dynamic displacement models and control models, and conducts experiments to measure the synchronous components of displacement and current for estimation.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Automation & Control Systems
Ruqi Sun, Waion Wong, Li Cheng
Summary: Dynamic vibration absorber (DVA) is an effective device for suppressing resonant vibration of noisy machineries and structures. This paper proposes a tunable electromagnetic shunt damper (EMSD) for the optimum design of DVA. The EMSD's damping force can be adjusted by changing the external resistance. Simulations and experiments are conducted to verify the variation of damping coefficient with the number of magnet pairs in the EMSD. It is the first experimental implementation report of the optimization procedure based on the fixed-points theory.
Article
Energy & Fuels
Biao Xiang, Xiang Wang, Wai On Wong
Summary: Flywheel energy storage system (FESS) is an energy conversion device with high requirements on power capacity, charging efficiency and output precision. This study proposes an observation control model to mitigate disturbance load torque during the charging process and a compound control model to improve response speed and output voltage precision during the discharging process of magnetically suspended FESS (MS-FESS). Simulations and experiments show improved charging efficiency and output voltage precision using the proposed control models.
JOURNAL OF ENERGY STORAGE
(2022)
Article
Engineering, Mechanical
Ruqi Sun, Waion Wong, Li Cheng
Summary: This paper examines and tests two types of hybrid dampers: EMSD+FD and EMSD+VNIC. Through proper control of additional damping, the feasibility of these two hybrid dampers is demonstrated.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Ruqi Sun, Waion Wong, Li Cheng
Summary: This paper proposes a bi-objective optimization methodology for electromagnetic shunt dampers (EMSD) to simultaneously maximize energy harvesting and suppress resonance vibration. By designing an EMSD with opposing magnet pairs configuration, both design objectives can be achieved in a single-degree-of-freedom system and a dynamic vibration absorber. The electromechanical transduction factor of the EMSD can be tuned to achieve both objectives simultaneously in different systems.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Electrical & Electronic
Muhammad Ayaz Akbar, Wai-On Wong, Emiliano Rustighi
Summary: This paper examines a hybrid damper combining a particle impact damper and a Coulomb friction damper, and it shows that this hybrid damper is more effective in reducing vibrations compared to using the two dampers separately. The hybrid damper achieves a similar vibration suppression performance to a traditional tuned mass damper, but it does not require optimally tuned natural frequency and damping, and does not have the detuning problem associated with the tuned mass damper. The proposed hybrid damper may be a simpler and better alternative to the tuned mass damper in passive vibration control applications.
Article
Acoustics
Biao Xiang, Jianmin Xu, Zhikai Liu, Waion Wong, Lingbo Zheng
Summary: The research focuses on the vibration characteristics and active control methods of the magnetically suspended blower (MSB) to mitigate the vibration amplitudes and dynamic displacements of the rotor shaft at high speed. Firstly, a dynamic model with four degrees of freedom (DOFs) of the rotor shaft in the MSB is established. Secondly, the vibration characteristics considering rotor unbalance and misalignment are analyzed using the complex-factor model. The complex-factor and complex-exponential function cross-feedback models are used to suppress the vibration amplitudes and dynamic displacements of the rotor shaft.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Muhammad Ayaz Akbar, Wai On Wong, Emiliano Rustighi
Summary: This research article presents a numerical approach to establish an optimal design methodology for a single-mass impact damper. The study finds that a single-mass impact damper designed with the optimal combination of design parameters can provide better vibration damping and relatively steady response. It outperforms the tuned mass damper in damping free vibrations of a single-degree-of-freedom primary structure. Although it cannot suppress forced vibration amplitude as effectively as a tuned mass damper at resonance, it has the advantages of lower cost and easier installation.
JOURNAL OF SOUND AND VIBRATION
(2024)
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)