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
Acoustics
Marcial Baduidana, Aurelien Kenfack-Jiotsa
Summary: The control performance of dynamic vibration absorbers can be improved by introducing a grounded negative stiffness device, which amplifies the vibration response of the primary system at low frequency region. However, combining mechanical devices with grounded positive stiffness can further enhance the vibration reduction of the undamped primary system. The proposed three-element DVA model, which combines the inerter device and grounded positive stiffness, shows high control performance and can be applied in various engineering practices.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Peng Sui, Yongjun Shen, Shaopu Yang, Junfeng Wang
Summary: A novel dynamic vibration absorber model based on the combined structure of grounded stiffness, inerter, and amplifying mechanism is proposed, which shows superior vibration absorption performance compared to other dynamic vibration absorbers. Numerical simulation verifies the correctness of the derived analytical solution, providing a theoretical basis for the design of new types of dynamic vibration absorbers.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Engineering, Mechanical
Hui Gao, Hao Wang, Jian Li, Jianxiao Mao, Zhihao Wang
Summary: A novel negative stiffness inerter damper (NSID) is proposed to improve the control performance of stay cables. The NSID utilizes the damping enhancement of negative stiffness and inerter for cable vibration control. The modal behavior of the cable based on optimum parameters of the NSID is explored, and the damping enhancement principle and conditions are demonstrated. The control efficacy of the NSID is evaluated, showing better performance than other dampers in mitigating multi-mode cable vibrations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Hui Gao, Hao Wang, Jian Li, Jianxiao Mao, Zhihao Wang
Summary: A novel negative stiffness inerter damper (NSID) is proposed in this study to improve the control performance of stay cables. The NSID utilizes the damping enhancement of negative stiffness and inerter for cable vibration control. The study explores the modal behavior of the cable based on optimum parameters of the NSID and demonstrates the principle and conditions of the NSID for cable vibration control. The NSID performs better than other dampers in mitigating cable vibrations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Yu-ji Tai, Hai-dong Wang, Zhi-qiang Chen
Summary: This paper presents a theoretical and numerical study of a tuned inerter negative stiffness damper (TINSD) system and its vibration control effect. The study shows that TINSD has superior performance in vibration isolation and seismic response control.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Acoustics
Marcial Baduidana, Aurelien Kenfack-Jiotsa
Summary: This paper investigates the control performance of a novel grounded inerter-based dynamic vibration absorber (GI-DVA) for random vibration reduction. By numerically solving for the optimal design parameters, it is found that the GI-DVA can effectively reduce the response of the primary structure under random excitation. The control performance of the GI-DVA is significantly superior to the classic DVA and passive nontraditional inerter-based DVA in terms of dynamic response reduction capacity and root mean square response evaluation.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Aimei Shi, Yongjun Shen, Junfeng Wang
Summary: This paper presents an optimal design of a dynamic vibration absorber with lever, inerter, and grounded stiffness. The differential equation of motion is established and the analytical solution is obtained. The fixed-point theory is used to determine the optimal frequency ratio of the absorber. The optimal grounded stiffness ratio and the working range of the inerter are also calculated. The numerical results obtained using MATLAB verify the analytical results and show that the proposed model can effectively reduce resonance amplitude and broaden vibration band.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2022)
Article
Engineering, Mechanical
Jue Wang, Ying Zhang, Daniel T. W. Looi
Summary: Two novel dynamic vibration absorbers, N-TID and N-TVMD, are proposed to reduce the vibration of a primary system subjected to acceleration excitation. They consist of parallel inerter and negative stiffness springs connected with different layouts. Analytical expressions of optimal design parameters for both H. and H2 optimization are derived based on fixedpoints and extreme value theories. The effectiveness of the analytical solutions is verified and the negative stiffness element in the N-TID and N-TVMD is found to outperform their original counterparts in terms of vibration reduction.
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
Construction & Building Technology
Huan Li, Kaiming Bi, Hong Hao
Summary: In this paper, a novel tuned negative stiffness inerter damper (TNSID) combining negative stiffness and inerter elements is proposed for seismic induced structural vibration control. The experimental results show that TNSID achieves dual mitigation effects on both the displacement and acceleration responses, widens the effective frequency bandwidth, and therefore achieves the most evident control effectiveness compared to the other devices investigated in this study.
JOURNAL OF BUILDING ENGINEERING
(2023)
Article
Engineering, Mechanical
Ning Su, Jing Bian, Shitao Peng, Zhaoqing Chen, Yi Xia
Summary: This paper investigates the performance of negative stiffness dynamic vibration absorbers (NS-DVAs) for controlling dynamic excitations and proposes an analytical optimal design approach for balancing the static amplification and dynamic reduction effects. The characteristics of static amplification and dynamic reduction factors are analyzed, and a control performance factor on the peak response is defined and optimized. The effectiveness of the proposed approach is illustrated through a numerical example for wind-induced vibration control.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Physics, Multidisciplinary
Ting Gao, Jing Li, Shaotao Zhu, Xiaodong Yang, Hongzhen Zhao
Summary: This paper investigates the H-8 optimization problem of a novel three-element-type DVA model with an inerter device and a grounded negative stiffness spring. By combining traditional theory and an intelligent algorithm, the optimal tuning frequency ratio, stiffness ratio, and approximate damping ratio are determined using fixed-point theory. The particle swarm optimization (PSO) algorithm is then used to optimize the four parameters of DVA simultaneously. The results show that the coupling of traditional theory and the intelligent algorithm has better effects than fixed-point theory alone, achieving nearly equal resonance peaks on the amplitude-frequency response curves.
Article
Mathematics, Applied
Jing Li, Xueqing Gu, Shaotao Zhu, Changlong Yu, Xiaodong Yang
Summary: A novel dynamic vibration absorber (DVA) model with negative stiffness and inerter-mass is proposed and analyzed in this paper. The research reveals the presence of fixed points in the amplitude frequency curve of the primary system, independent of the absorber damping, when negative stiffness and inerter-mass are incorporated. The optimal frequency ratio is determined based on the fixed-point theory, and the stability of the system is found to be affected by the inerter coefficient when selecting the optimal negative stiffness ratio. The presented DVA is compared with three existing typical DVAs, and it demonstrates significant reduction in peak value of the amplitude-frequency curve of the primary system and broadening of the effective frequency range for vibration mitigation.
JOURNAL OF NONLINEAR MATHEMATICAL PHYSICS
(2022)
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)