Article
Acoustics
Xiaoyun Zhang, Dengqing Cao, Mei Liu, Yishen Tian, Jie Tang, Bolong Jiang, Wenhu Huang
Summary: This paper proposes a negative stiffness device composed of two horizontal pre-compression springs to isolate the vibration of a simply supported beam. The effects of support position and negative stiffness parameters on the natural frequency of the beam are analyzed, and the influence of the negative stiffness support parameters on the amplitude-frequency curve and transmissibility curve of the simply supported beam is discussed.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Engineering, Civil
Yamin Zhao, Junning Cui, Limin Zou, Zhongyi Cheng
Summary: This paper proposes a magnetically repulsive negative stiffness permanent magnetic array (MRNSPMA) to reduce the natural frequency of air isolators and achieve low or ultra-low frequency air/magnetic composite vibration isolation with large payloads. The superiority of MRNSPMA in achieving high amplitude negative stiffness is verified and the effects of structural parameters on vibration transmissibility are investigated. The results show that MRNSPMA can significantly improve the isolation performance of cutting-edge scientific experimental systems and facilities.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Engineering, Mechanical
Guilin Wen, Junfeng He, Jie Liu, Yu Lin
Summary: This study aims to expand the effective displacement range of quasi-zero stiffness systems through a semi-active control strategy. A novel vibration isolation system based on oblique springs and a coil spring is proposed, along with a feedback displacement strategy for stiffness adjustment. Theoretical analysis and virtual prototype simulation results show significant advantages in low-frequency vibration isolation performance for the proposed system.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Ming Li, Wei Cheng, Ruili Xie
Summary: This paper introduces a passive quasi-zero-stiffness vibration isolator using a cam mechanism, which can generate ideal simplest restoring force directly and eliminate approximation errors. Experimental results confirm the proposed design principle and show the advantages of the QZS isolator in vibration tests, with wider isolation frequency bandwidth and weaker resonance effect compared to linear counterparts. The specific isolation efficiency and the effect of excitation amplitudes on vibration attenuation performance are comprehensively compared.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Mechanics
Jiangchuan Niu, Wanjie Zhang, Xiangyue Zhang
Summary: The transmissibility of forced resonance in a nonlinear vibration isolation system under base excitation has been investigated, with a focus on the effects of quasi-zero stiffness and quadratic damping. It is shown that subharmonic resonance only occurs within a certain frequency range, and can be completely eliminated by appropriate parameters. The nonlinear system with quasi-zero stiffness and quadratic damping can achieve better amplitude suppression than the linear damping system.
Article
Acoustics
Cesar A. Morales
Summary: This paper presents a novel design approach for tuned mass dampers in isolated structures, aiming to control base displacements and address the issue of large isolator displacement during earthquakes. The optimization method is based on a displacement transmissibility function and combines new seismic displacement narrowbandness, simple relative transmissibility function, and compound design of isolation and tuned mass damper. By properly designing a tuned mass damper subsystem jointly with the isolation one, the large isolator displacement problem can be effectively solved or mitigated.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Multidisciplinary Sciences
Luming Zou, Chao Zheng, Zhi Zheng, Feng Hu, Yichuan Shao, Xin Xue
Summary: In this study, a horizontally symmetric all-metallic vibration isolator (AM-VI) was proposed and analyzed using the elliptic method and the frequency sweeping method. The results showed that the choice of test method significantly affected the calculation of dynamic stiffness and loss factor. Evaluation of vibration isolation performance using mechanical impedance and force transmissibility demonstrated that the AM-VI achieved excellent performance over a wide frequency range.
Article
Engineering, Mechanical
Piyush Wanchoo, Akash Pandey, Arun Shukla
Summary: This study investigates the mechanics of air shock interacting with closed-cell polymeric foam. The authors use ultra-high-speed imaging and digital image correlation to analyze stress wave propagation. The results show that polymeric foam has good force transmission capability under shock loading, making it suitable for blast mitigation applications.
EXTREME MECHANICS LETTERS
(2023)
Article
Engineering, Mechanical
Kan Ye, J. C. Ji
Summary: In this study, an origami-inspired vibration isolator with quasi-zero-stiffness (QZS) property is proposed using a truss-spring based stack Miura-ori (TS-SMO) structure. The unique structure uses coil spring sets to replace deformable creases, improving physical realization in engineering applications. Nonlinear force response and QZS feature are achieved through geometric nonlinearity and specific Poisson's ratio profile, with isolation performance discussed under variable viscous damping effects.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Tengfei Chen, Yuxuan Zheng, Linhui Song, Xiumin Gao, Zhiming Li
Summary: This paper proposes a quasi-zero-stiffness (QZS) isolator with a new design of positive stiffness configuration, which exhibits beneficial nonlinearity and enhances the vibration isolation performance compared to previous designs.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Luca Marino, Alice Cicirello
Summary: This study investigates the steady-state response of harmonically excited multi-degree-of-freedom systems with Coulomb contact. The results show that MDOF systems exhibit significantly different dynamic behaviors depending on whether friction contact and harmonic excitation are applied to the same or different masses.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Junhan An, Guoping Chen, Xi Deng, Chen Xi, Tao Wang, Huan He
Summary: This paper examines the dynamic phenomenon of a pneumatic QZS isolator with mistuned mass and analyzes the amplitude-frequency relationship and force transmissibility. The results show that, in the case of a large mass mistuning, the system exhibits possible response periods and chaos phenomena. Mass detuning leads to a more complex nonlinear response of the QZS isolator, and the dynamic response becomes more sensitive to changes in parameters such as external excitation frequency, amplitude, and damping ratio. These findings are helpful for improving the structure of the pneumatic QZS vibration isolator and determining the applicable working frequency.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Multidisciplinary
Ze-Qi Lu, Dong-Hao Gu, Hu Ding, Walter Lacarbonara, Li-Qun Chen
Summary: The study explores the performance enhancement of vibration isolation of a circular ring using a shape memory alloy wire rope. The numerical simulations support the analytical results, showing that the SMA composed of NiTi19/NiTi1 is optimal for the ring isolation design. The developed ring beam vibration isolator reduces the transmissibility around the resonance frequency and performs better at high frequencies for appropriate types of SMA.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Mechanical
Rong Zeng, Guilin Wen, Jiaxi Zhou, Shan Yin, Qiang Wang, Xin Wu
Summary: Compared with traditional quasi-zero-stiffness (QZS) isolators, the QZS isolator with displacement constraints theoretically demonstrates lower transmissibility peak value and wider isolation-frequency range. This study builds an experimental structure and conducts dynamic experiments to explore the isolation characteristics of the QZS structure with displacement constraints. The theoretical framework of a QZS structure with displacement constraints (QZS-HCM) is developed based on Hertz's contact model, and the physical realization of the QZS-HCM system is achieved through manufacturing and assembly of the structure. Experimental validation and analysis reveal that the QZS-HCM isolator exhibits lower response peak and wider isolation-frequency range under large-amplitude excitation when compared with traditional QZS isolators.
ACTA MECHANICA SINICA
(2023)
Article
Engineering, Mechanical
Zhuang Dong, Baiyang Shi, Jian Yang, Tianyun Li
Summary: The study introduces a nonlinear passive joint device based on inerter for vibration attenuation in coupled systems. The proposed joint can effectively shift response peaks to lower frequencies, substantially reducing vibrations and energy transmission between subsystems when added to the force-excited subsystem or to the coupling interface of subsystems.
NONLINEAR DYNAMICS
(2022)
Article
Acoustics
Olavo M. Silva, Miguel M. Neves, Arcanjo Lenzi
JOURNAL OF SOUND AND VIBRATION
(2019)
Article
Acoustics
Si Mohamed Sah, Jon Juel Thomsen, Dmitri Tcherniak
JOURNAL OF SOUND AND VIBRATION
(2019)
Article
Acoustics
Olavo M. Silva, Miguel M. Neves, Arcanjo Lenzi
JOURNAL OF SOUND AND VIBRATION
(2020)
Article
Acoustics
Dovydas Vaitkus, Dmitri Tcherniak, Jonas Brunskog
Correction
Acoustics
Olavo M. Silva, Miguel M. Neves, Arcanjo Lenzi
JOURNAL OF SOUND AND VIBRATION
(2020)
Correction
Acoustics
Olavo M. Silva, Miguel M. Neves, Arcanjo Lenzi
JOURNAL OF SOUND AND VIBRATION
(2020)
Article
Engineering, Multidisciplinary
Olavo M. Silva, Miguel M. Neves
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN ENGINEERING
(2020)
Article
Engineering, Civil
Jannie S. Nielsen, Dmitri Tcherniak, Martin D. Ulriksen
Summary: This paper presents a case study on estimating the value of information delivered by a structural health monitoring (SHM) system in wind turbine blades, using a Bayesian decision analysis framework. It also demonstrates through a parameter study how the reliability of the SHM system significantly affects its potential benefits.
STRUCTURE AND INFRASTRUCTURE ENGINEERING
(2021)
Article
Engineering, Mechanical
Dmitri Tcherniak, Manuel Schwaab
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Engineering, Mechanical
Luis David Avendano-Valencia, Eleni N. Chatzi, Dmitri Tcherniak
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2020)
Article
Engineering, Mechanical
Marie Brons, Jon Juel Thomsen, Si Mohamed Sah, Dmitri Tcherniak, Alexander Fidlin
Summary: This study investigates a new technique for estimating bolt tension based on hammer impact, examining the potential of the method through experimental investigations of different bolted structures. The results show that the method is particularly effective for estimating bolt tension when the tension is large.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
E. L. Oliveira, A. G. Marto, R. G. A. da Silva, F. Afonso, N. M. M. Maia, A. Suleman
Summary: Piezoelectric materials, specifically PVDF sensors and PZT actuators, have been used to quantify the aeroelastic response of aircraft wings in wind tunnel testing. The study showed that a single PVDF sensor could accurately estimate modal parameters in turbulent and noisy conditions, with PZT reducing exogenous noise in high averages.
EXPERIMENTAL TECHNIQUES
(2022)
Article
Thermodynamics
Lucas Q. Machado, Panagiotis Alevras, Dmitri Tcherniak, Junlei Wang, Shengxi Zhou, Daniil Yurchenko
Summary: This study presents a high-power multi-beam piezoelectric energy harvesting device designed to meet the demands of emerging technologies in sensor networks, the Internet of Things, and industrial IoT. The device can be tuned to any frequency and demonstrates superior performance in the frequency range of 2-50 Hz, delivering hundreds of mW.
ENERGY CONVERSION AND MANAGEMENT
(2022)
Proceedings Paper
Engineering, Civil
B. A. Qadri, M. D. Ulriksen, L. Damkilde, D. Tcherniak
DYNAMICS OF CIVIL STRUCTURES, VOL 2, IMAC 2019
(2020)
Article
Mechanics
Miguel Matos Neves
INTERNATIONAL JOURNAL FOR COMPUTATIONAL METHODS IN ENGINEERING SCIENCE & MECHANICS
(2019)
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)