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
Acoustics
Zhenhua Zhou, Zhihui Dai, Zhiqiang Liu, Xin Liu, Shuhan Chen, Zhanhui Li, Minrui Zhou
Summary: This study proposes a vibration isolator with a novel negative stiffness element configured with two electromagnetic springs in parallel. The isolator achieves high static stiffness and low dynamic stiffness, and the isolation bandwidth can be adjusted by changing the coil current.
Article
Acoustics
Yaopeng Chang, Jiaxi Zhou, Kai Wang, Daolin Xu
Summary: This paper proposes a quasi-zero-stiffness (QZS) DVA for ultra-low frequency vibration absorption, which is designed using a simple oblique-spring model and verified for its dynamic behavior through the harmonic balance method (HBM) and numerical analyses. Experimental results demonstrate the excellent performance of QZS DVA in absorbing ultra-low frequency vibrations.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Multidisciplinary
Qiang Wang, Jiaxi Zhou, Kai Wang, Jinghang Gao, Qida Lin, Yaopeng Chang, Daolin Xu, Guilin Wen
Summary: This paper proposes a dual-function quasi-zero-stiffness energy harvesting dynamic vibration absorber (EHDVA) to simultaneously mitigate vibration and harvest energy. The device consists of a quasi-zero-stiffness absorber and an electromagnetic transducer, which can achieve high-efficiency vibration attenuation and energy harvesting at ultra-low frequency.
APPLIED MATHEMATICAL MODELLING
(2023)
Article
Engineering, Mechanical
Yaopeng Chang, Jiaxi Zhou, Kai Wang, Daolin Xu
Summary: The semi-active quasi-zero-stiffness dynamic vibration absorber (SAQZS DVA) with an electromagnetic actively regulatory mechanism (ARM) embedded in it allows for vibration absorption tuning in ultra-low frequencies, showing effective vibration absorption and tuning capabilities. Experimental results indicate that the SAQZS DVA can achieve vibration absorption at ultra-low frequencies.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Engineering, Mechanical
Mengjian Tian, Bingzhao Gao
Summary: A novel in-wheel powertrain system with dynamic vibration absorbers was developed to improve ride comfort in electric vehicles. Through static analysis and dynamic modeling, it was shown that this system could effectively enhance ride comfort.
MECHANISM AND MACHINE THEORY
(2021)
Article
Acoustics
Ehsan Davoodi, Pedram Safarpour, Mahdi Pourgholi, Mostafa Khazaee
Summary: This article presents a seat suspension based on negative stiffness structure to reduce vibration transmitted to helicopter pilots. By studying the impact of parameters on system performance, design parameters are determined to make the system respond simultaneously as a negative stiffness structure in both directions.
JOURNAL OF VIBRATION AND CONTROL
(2022)
Article
Engineering, Mechanical
Rong-Biao Hao, Ze-Qi Lu, Hu Ding, Li-Qun Chen
Summary: An orthogonal six-DOFs vibration isolation system with tunable high-static-low-dynamic stiffness characteristics is studied using experimental and analytical methods. The results show that the isolation frequency range is widened with increasing controlled current, and increasing the electromagnetic coefficient and decreasing the onset distance can decrease the isolation start frequency.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Acoustics
K. Balamonica, Andrea Bergamini, Bart Van Damme
Summary: Ballast, as a load transfer medium between rails and subgrade, is a crucial component of railways. In low frequency analytical modeling of track dynamics, it is idealized as a spring with constant stiffness. However, for modeling railway noise, the frequency dependency of ballast stiffness and damping at high frequencies is of utmost importance.
JOURNAL OF SOUND AND VIBRATION
(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
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
Chemistry, Multidisciplinary
Mohammad Abuabiah, Yazan Dabbas, Luqman Herzallah, Ihab H. Alsurakji, Mahmoud Assad, Peter Plapper
Summary: A vibration isolation system for vehicle seats has been designed in this study, which utilizes oblique springs, a vertical spring, and a sleeve air spring to achieve quasi-zero stiffness and support additional load. The system improves the vibration isolation performance of the seats for small vehicles.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Civil
Chen Jiaqi, Zhong Yifeng, Luo Qiushi, Shi Zheng
Summary: The isogrid stiffened composite plate (ISCP) is lightweight and can resist bending and buckling loads effectively. By decoupling the original geometric nonlinear problem into linear constitutive modeling and geometrically nonlinear analysis, the relationship between structural parameters and static/dynamic behavior of ISCP is revealed. The results show that the equivalent stiffness, buckling load and natural frequency of ISCP increase with certain structural parameters, while the model can improve calculation efficiency with sufficient accuracy for preliminary design.
THIN-WALLED STRUCTURES
(2021)
Article
Engineering, Multidisciplinary
Ze-Qi Lu, Dao Wu, Hu Ding, Li-Qun Chen
Summary: An electromagnetic Stewart platform with high static and low dynamic stiffness is explored to reduce vibration in six degrees of freedom (6-DOFs) and harvest energy simultaneously. The use of stiffness nonlinearity improves vibration isolation efficiency, leading to lower frequencies for vibration isolation and considerable power output. Analytical and numerical results both support the extension of vibration isolation frequency band and reduced vibration transmissibility with increased energy harvesting.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Mechanical
Xiaoqiang Chong, Zhijing Wu, Fengming Li
Summary: A nonlinear X-combined structure is proposed to improve vibration isolation characteristics by avoiding negative stiffness and unstable factors. The structure uses an X-shaped mechanism and inclined springs to achieve high-static and low-dynamic stiffness. The combination of two nonlinear mechanisms is investigated to evaluate the vibration isolation performance. The results show that the proposed structure has positive/quasi-zero/zero stiffness over the entire working range, with better vibration isolation performance compared to existing nonlinear isolators.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Acoustics
Dao Gong, Jinsong Zhou, Wenjing Sun, Yu Sun, Zhanghui Xia
JOURNAL OF SOUND AND VIBRATION
(2017)
Article
Engineering, Mechanical
Yu Sun, Jinsong Zhou, Dao Gong, Wenjing Sun, Zhanghui Xia
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2019)
Article
Acoustics
Zhanghui Xia, Dao Gong, Jinsong Zhou, Wenjing Sun, Yu Sun
SHOCK AND VIBRATION
(2018)
Article
Engineering, Mechanical
Zhanghui Xia, Jinsong Zhou, Dao Gong, Wenjing Sun, Yu Sun
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Nanoscience & Nanotechnology
Yu Sun, Jinsong Zhou, Dao Gong, Taiwen You, Jiangxue Chen
Summary: The research proposes using a multi-point connection scheme for installing under-chassis equipment, and through an optimization design method, it reduces the impact of static and dynamic vibrations on the carbody.
Article
Engineering, Mechanical
Yu Sun, Jinsong Zhou, Dao Gong, Yuanjin Ji
Summary: In this paper, a multi-degree of freedom dynamic vibration absorber (MDOF DVA) is proposed to absorb the vibration of the high-speed train car body in multiple degrees of freedom. The principle of Multi-DOF dynamic vibration absorption is analyzed by combining the design method of a single DVA and genetic algorithm. The vibration control effect on each DOF of the MDOF DVA is analyzed through a dynamics model and virtual excitation method. The vibration control performance of the MDOF DVA with a nonlinear HSLDS mount on the car body is analyzed through dynamic simulation.
MECHANICAL SCIENCES
(2022)
Article
Mechanics
Yu Sun, Jinsong Zhou, David Thompson, Tianchen Yuan, Dao Gong, Taiwen You
INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS
(2020)
