Article
Mechanics
Liang Ma, Jun Wang, Chenghao Li
Summary: This study focuses on the influence mechanism of a magnetorheological damper on the dynamic characteristics of a rotor system, revealing the advantages of the damper in vibration suppression and the instability issues caused by nonlinear excitation.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Mechanical
Jun Wang, Xuening Zhang, Yunfei Liu, Zhaoye Qin, Liang Ma, Fulei Chu
Summary: A new method of oil-film zoning control is proposed to extend rotor vibration reduction to the high-frequency range, addressing the unsatisfactory performance of damping support structures. A novel integral magnetorheological damper (IMRD) is used to achieve excellent vari-stiffness and vari-damping effects through oil-film zoning control, effectively reducing vibration in the resonance and high-frequency ranges.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Mechanical
Kwangchol Ri, Yongson Jong, Cholil Yun, Kwangchol Kim, Poknam Han
Summary: This paper investigates the nonlinear vibration phenomena and dynamic response characteristics of a flexible rotor supported on squeeze-film dampers (SFDs). The study validates the proposed method through the modified incremental harmonic balance method and the Floquet theory. This research is important for studying the nonlinear vibration phenomena of rotor-bearing systems supported on fluid-film bearings such as SFDs.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Mechanical
J. Yang, D. Ning, S. S. Sun, J. Zheng, H. Lu, M. Nakano, S. Zhang, H. Du, W. H. Li
Summary: Active suspensions have excellent performance in reducing vibrations, but have high power consumption, cost, and potential instability issues. Semi-active suspensions are simple and stable, but do not provide equivalent performance. This new semi-active suspension with negative stiffness component using MR damper provides vibration-reduction performance comparable to active systems, avoiding the disadvantages of active control.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Jinxin Dou, Hongliang Yao, Hui Li, Jianlei Li, Ruyu Jia
Summary: A track nonlinear energy sink with restricted motion (RM-TNES) is proposed to solve the problem of limited vibration suppression performance of the traditional track nonlinear energy sink (TNES) due to the energy threshold limitation. The structure, principles, and effects of parameters of the RM-TNES are introduced. The dynamic model for the rotor-RM-TNES system is developed, and the parameters are optimized using a genetic algorithm. The vibration suppression effects of the RM-TNES and traditional TNES are compared and analyzed under steady-state and transient excitation, and experimental studies are carried out on the coupled system. The results show that the vibration suppression performance of the traditional TNES is significantly limited at the dead-zone, while the RM-TNES successfully suppresses vibrations.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
Miguel Angel Moreno-Mateos, Mokarram Hossain, Paul Steinmann, Daniel Garcia-Gonzalez
Summary: This study explores the design and performance of ultra-soft hybrid magnetorheological elastomers (MREs) through experimental and computational methods. Experimental results show that the magnetomechanical performance of hybrid MREs can be optimized by selecting an appropriate mixing ratio between particles. Computational results reveal the magneto-mechanical interactions between soft and hard particles, which are crucial for the effective response of hybrid MREs. The study uncovers new possibilities to push the frontiers of MRE solutions.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Engineering, Mechanical
Munyaneza Olivier, Jung Woo Sohn
Summary: This study presents a novel hybrid type magnetorheological damper, which achieves enhanced damping force through design optimization and characteristics analysis. Numerical simulation results demonstrate that the proposed hybrid damper can improve ride comfort and road holding capability on various road conditions.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Civil
Kwangchol Ri, Kumchol Kim, Cholil Yun, Kwangchol Kim, Tongil Choe
Summary: This paper analyzes the nonlinear vibration of a flexible rotor supported on squeeze-film dampers (SFDs) with centering springs using the incremental harmonic balance (IHB) method. It investigates the bifurcation phenomena that appear in the resonance region. The study combines the classical IHB method with the alternating frequency/time (AFT) method to overcome the complexity of the nonlinearities in the system. The proposed method is validated and applied to analyze the nonlinear vibration of rotor systems supported on fluid-film bearings.
INTERNATIONAL JOURNAL OF STRUCTURAL STABILITY AND DYNAMICS
(2022)
Article
Engineering, Mechanical
Jun Wang, Yunfei Liu, Zhaoye Qin, Liang Ma, Fulei Chu
Summary: Magnetorheological dampers (MRDs) are effective in vibration control in rotor systems, but they have limitations in dealing with nonlinear behaviors under large eccentricity and controlling the direction of damping force. To address these issues, this paper proposes an integral magnetorheological damper (IMRD) that allows adjustable magnitude and direction of oil film force. The IMRD model is implemented in a flexible rotor system, and the results show that IMRD can provide pure damping with adjustable stiffness and reduce nonlinearity compared to traditional MRDs.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Instruments & Instrumentation
Xiong Deng, Xiaomin Dong, Jianwei Xing, Wenfeng Li, Jun Xi
Summary: Whole-satellite vibration isolation system with magneto-rheological (MR) damper is a new approach to address the issue of small amplitude and medium-high frequency vibration. However, the super hysteresis and variable stiffness properties of MR damper have not been adequately researched. This study employs an improved Bingham model to identify the MR damper and analyzes the dynamic characteristics of the whole-satellite system using nonlinear bifurcation theory. A nonlinear analysis method for the MR whole-satellite system with variable parameters is proposed. The results demonstrate that the improved Bingham model effectively captures the nonlinear hysteretic and variable stiffness behavior of the MR damper. Additionally, the parameter-varying system shows good adaptability within the selected range of bifurcation parameters. This study provides a foundation for designing structural parameters and optimizing the control strategy for MR whole-satellite systems.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Mechanical
Bingsan Chen, Na She, Dongdong Lin, Xiaoyu Yan, Xiaodong Peng
Summary: A composite magnetorheological damper is proposed to improve the damping force in the shearing direction. The autoregressive higher-order spectrum model is used to investigate the correlation between crucial parameters and damper performance. Experimental results show that the composite damper performs well and the higher-order spectrum and its slices exhibit different distributions under different working states.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Construction & Building Technology
Guanliang Liu, Peng Zhou, Tong Yu, Zeping Li
Summary: Negative-stiffness dampers are promising devices for effectively mitigating cable vibrations. Recent studies have found that flexible supports can enhance the performance of these dampers. This study extends the understanding of the impact of support flexibility under nonlinear conditions and proposes an optimization process for determining the required negative-stiffness dampers and supports. Experimental validation and numerical simulations demonstrate the effectiveness of the proposed method.
Article
Engineering, Mechanical
Yang Yang, Ying-Qing Guo
Summary: This study established numerical models of spatial eccentric structures equipped with multiple MR dampers and conducted time history analysis to mitigate torsional vibrations. The effectiveness of the MR control system was verified by comparing the seismic responses of the uncontrolled structure and the structure with multiple MR dampers. The results show that the control system significantly attenuates the torsional vibrations of eccentric structures.
Article
Engineering, Mechanical
Hang Zhang, Miaomiao Cheng, Xiang Zhou, Libo Feng, Kai Feng
Summary: This study demonstrates that hybrid foil magnetic bearings can optimize the dynamic performance and improve the stability of the rotor system by adjusting the working mode and load sharing ratio. The results show that an appropriate load sharing ratio with hybrid mode can effectively improve the rotordynamic performance of the HFMBs-rotor system, while increasing the load can also significantly improve the stability of the system.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Marine
Meng-Chang Hsieh, Guan-Lee Huang, Haijun Liu, Shih-Jiun Chen, Bang-Fuh Chen
Summary: This paper investigates the performance of the hybrid TMD + TLD system in reducing the motion of a structure, showing that the system can effectively reduce the dynamic response of the structure and increase the bandwidth of excitation frequency. Proper parameter selection plays a key role in the performance of the system.
Article
Materials Science, Multidisciplinary
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: The impact response of shear deformable sandwich cylindrical shells with a functionally graded porous core is influenced by factors such as core thickness, impact velocity, foam type, foam coefficient, and masses of impactor and shell.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Engineering, Aerospace
Yunfei Liu, Wenyang Hu, Runze Zhu, Babak Safaei, Zhaoye Qin, Fulei Chu
Summary: In this study, a novel computational method for nonlinear impact force in the local contact area is proposed, and the dynamic response of corrugated structures is analyzed. By establishing an equivalent shell model and using numerical solution techniques, the impact response of corrugated shells under low-velocity impact is effectively studied.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Aerospace
Feng Liu Yang, Yan Qing Wang, Yunfei Liu
Summary: This paper focuses on the low-velocity impact response of axially moving graphene platelet reinforced metal foam plates. It investigates the effect of foam distribution, graphene platelet patterns, weight fraction, foam coefficient, plate speed, impactor mass, and impact velocity on the impact response of axially moving graphene platelet reinforced metal foam plates.
AEROSPACE SCIENCE AND TECHNOLOGY
(2022)
Article
Engineering, Mechanical
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This paper establishes a nonlinear coupled mechanical model to analyze the nonlinear forced vibrations of rotating shells subjected to multi-harmonic excitations in a thermal environment. The effects of main factors on the nonlinear dynamic response of rotating shells are evaluated through numerical simulations and result verification.
NONLINEAR DYNAMICS
(2022)
Article
Mechanics
Wenliang Gao, Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This research presents a mathematical model and solution for investigating wave propagation in graphene platelets (GPLs)-reinforced functionally graded (FG) metal foam plates in a complex environment. The study provides insights into the effects of material properties and geometry on wave propagation characteristics.
INTERNATIONAL JOURNAL OF APPLIED MECHANICS
(2022)
Article
Metallurgy & Metallurgical Engineering
Liu Yun-fei, Qin Zhao-ye, Chu Fu-lei
Summary: The nonlinear vibration of graphene platelets reinforced composite corrugated (GPRCC) rectangular plates with shallow trapezoidal corrugations is investigated. The unit cell half period, unit cell inclination angle, unit cell height, graphene platelet dispersion pattern, and graphene platelet weight fraction and geometry play important roles in the nonlinear vibration of the GPRCC plates.
JOURNAL OF CENTRAL SOUTH UNIVERSITY
(2022)
Article
Mathematics, Applied
Yunfei Liu, Jun Wang, Jiaxin Hu, Zhaoye Qin, Fulei Chu
Summary: This paper studies the multiple internal resonances of composite cylindrical shells induced by rotation and the effect of temperature field variations on the system response. The equilibrium equations of the system are obtained using the Hamilton principle and the modified Donnell nonlinear shell theory, and then transformed into ordinary differential equations (ODEs) using the multi-mode Galerkin technique. The numerical results are obtained using the pseudo-arclength continuation method, which can identify the regions of instability. The study finds that the interaction between backward and forward wave modes causes multiple internal resonances, and the nonlinear amplitude-frequency response curves vary under different temperature fields.
APPLIED MATHEMATICS AND MECHANICS-ENGLISH EDITION
(2022)
Article
Engineering, Civil
Yunfei Liu, Runze Zhu, Zhaoye Qin, Fulei Chu
Summary: The vibration characteristics of corrugated shells under arbitrary boundary conditions are studied through theoretical analysis, finite element simulation, and experimental verification. An equivalent orthotropic shell model is established based on a homogenization analytical technique, and the strain-displacement relationships are obtained using Love thin shell theory. The Rayleigh-Ritz method is employed to calculate the natural frequencies, and the modal expansion approach is used to determine forced vibration responses. The effects of unit cell parameters and boundary conditions on the vibration characteristics of corrugated shells are investigated.
ENGINEERING STRUCTURES
(2022)
Article
Mechanics
Qiyi Dai, Yunfei Liu
Summary: This article investigates the dynamic stability and parametric stability characteristics of rotating truncated conical shells under periodic axial loads, using the Floquet exponent method to analyze its parametric stability. The proposed model and stability analysis method are verified by comparing with the results of other literature.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Mechanical
Runze Zhu, Yunfei Liu, Navya Bojja, Zhaoye Qin, Fulei Chu
Summary: This study proposes a unified modeling approach for rotating thin disks with ABH indentations. Finite element analysis is conducted to validate the proposed model. It is found that ABHs are capable of realizing vibration reduction for rotating structures, where the effectiveness is influenced by rotating speeds and excitation types.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This study aims to improve the impact protection performance of composite structures by combining a honeycomb core with negative Poisson's ratio and graphene platelets reinforced (GPR) face sheets. The nonlinear repeated low-velocity impact responses of auxetic honeycomb composite plates are investigated, and effective material properties are obtained using the proposed modified Gibson function and Halpin-Tsai model. Nonlinear equations of motion are derived, and the time-varying contact force is defined using the modified nonlinear Hertz contact theory. The proposed methods are verified through finite element simulation and experiment.
JOURNAL OF APPLIED MECHANICS-TRANSACTIONS OF THE ASME
(2023)
Article
Engineering, Mechanical
Jun Wang, Xuening Zhang, Yunfei Liu, Zhaoye Qin, Liang Ma, Fulei Chu
Summary: A new method of oil-film zoning control is proposed to extend rotor vibration reduction to the high-frequency range, addressing the unsatisfactory performance of damping support structures. A novel integral magnetorheological damper (IMRD) is used to achieve excellent vari-stiffness and vari-damping effects through oil-film zoning control, effectively reducing vibration in the resonance and high-frequency ranges.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Chemistry, Physical
Kaikai Qiao, Guoquan Liu, Xinpeng Xie, Yunfei Liu, Wenfeng Jiang, Fei Li, Lei Shi
Summary: This paper describes an acceptorless dehydrogenation process of N-heterocycles using a photoelectrochemical method under simulated sunlight irradiation at room temperature. Various N-heterocyclic compounds were effectively dehydrogenated into the corresponding products with high yields (up to 97%), accompanied by simultaneous hydrogen evolution in a PEC cell comprising a mesoporous BiVO4 photoanode and Pt electrode.
Article
Engineering, Civil
Yunfei Liu, Zhaoye Qin, Fulei Chu
Summary: This paper investigates the nonlinear vibrations of auxetic honeycomb composite plates and evaluates the impact of important parameters on the vibration characteristics. The nonlinear response curves are determined using the proposed modified Gibson function and multiple scale method.
THIN-WALLED STRUCTURES
(2023)
