Article
Construction & Building Technology
Satish Nagarajaiah, Keguan Zou, Sudheendra Herkal
Summary: This paper investigates the influence of negative stiffness device (NSD) on the effect of vibration isolation system, finding that NSD can significantly reduce vibration transmissibility and increase the efficacy of the isolation system. The study shows that a system with NSD and larger damping helps in reducing transmissibility, which is in contrast to conventional isolation systems.
STRUCTURAL CONTROL & HEALTH MONITORING
(2022)
Article
Engineering, Geological
Marina E. Kalogerakou, Konstantinos A. Kapasakalis, Ioannis A. Antoniadis, Evangelos J. Sapountzakis
Summary: This article proposes a novel vertical Stiff dynamic absorber (SDA) that aims to minimize vertical accelerations induced on the structure and keep the displacement within reasonable limits. The optimized design parameters of the SDA are applicable across a wide range of vertical vibration control applications, achieving great acceleration isolation without compromising the weight-bearing capacity of the structure.
BULLETIN OF EARTHQUAKE ENGINEERING
(2023)
Article
Automation & Control Systems
Bo Yan, Peng Ling, Lunlun Miao, Ning Yu, Jiaojiao Sun, Qinchuan Li
Summary: This work presents a cockroach-inspired structure coupled with electromagnetic shunt damping (EMSD) for ultra-low frequency vibration isolation. The EMSD includes linear damping and nonlinear damping achieved through geometric nonlinearity. By adjusting the geometric parameters and assembly configuration, the electromagnetic coupling coefficient can be increased, resulting in enhanced equivalent damping. Experimental results demonstrate the effectiveness of EMSD in reducing the transmission rate of ultra-low frequency vibration without significant impact on high-frequency vibration isolation.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Mechanics
Wei Zou, Chun Cheng, Ran Ma, Yan Hu, Weiping Wang
Summary: A novel vibration isolation system with quasi-zero stiffness and nonlinear damping using geometric nonlinearity and scissor-like structures is proposed. This system can isolate low-frequency vibration, suppress high-amplitude vibration, and has minimal impact from increasing nonlinear damping at high frequencies. The theoretical results show that this system outperforms classical counterparts.
ARCHIVE OF APPLIED MECHANICS
(2021)
Article
Engineering, Civil
Zhipeng Zhao, Yanchao Wang, Xiuyan Hu, Dagen Weng
Summary: This study aims to enhance the seismic performance of containment structures in nuclear power plants by constructing a novel negative-stiffness amplification system-strengthened isolation system (NSAS-IS). A multiperformance-oriented design principle is developed for the NSAS-IS to improve energy dissipation and control during seismic excitations. The NSAS-IS, consisting of an NSAS and parallel isolators, provides improved isolation and reduced responses compared to conventional isolators. The new isolation system exhibits enhanced energy dissipation efficiency and capacity, relieving the energy dissipation burden on primary structures during multi-intensity excitations.
ENGINEERING STRUCTURES
(2022)
Article
Engineering, Mechanical
Yuyang Chai, Jing Bian, Meng Li
Summary: This paper proposes a novel linkage anti-vibration structure (LAVS) with a linear positive and negative stiffness compensation mechanism for low-frequency vibration isolation. The static stiffness behavior is investigated, and by tuning structural parameters, the linear spring can completely compensate the linear negative stiffness to achieve enhanced quasi-zero stiffness. Numerical simulations and analysis demonstrate the effectiveness of the presented stiffness compensation mechanism.
NONLINEAR DYNAMICS
(2023)
Article
Construction & Building Technology
Xiaofang Kang, Shuai Li, Jun Hu
Summary: This paper studies the damping isolation control system of the building structure based on negative stiffness to improve the damping capacity. The dynamic equation and parameters of the damping isolation control system are optimized using H-2 norm theory and Monte Carlo pattern search method. Taking a 5-story building structure as an example, the damping performance of the system under actual earthquakes is analyzed and evaluated. The results show that negative stiffness can enhance the damping capacity and the system has good damping effect under actual earthquakes.
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
Chuanyun Yu, Qidi Fu, Jianrun Zhang, Ning Zhang
Summary: This paper proposes a quasi-zero stiffness vibration isolator and investigates its vibration isolation characteristics, validating its better vibration isolation performance in the low-frequency region through numerical simulations and experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Xiao Feng, Xingjian Jing, Yingqing Guo
Summary: This study presents a novel way to achieve superior passive vibration isolation using a specially designed and compact linkage mechanism, with beneficial nonlinear inertia and an adjustable nonlinear stiffness system. The proposed system shows significantly reduced resonant frequency and enhanced damping effect in a beneficial nonlinear way, resulting in excellent vibration isolation performance.
NONLINEAR DYNAMICS
(2021)
Review
Mechanics
Ge Yan, Hong-Xiang Zou, Sen Wang, Lin-Chuan Zhao, Zhi-Yuan Wu, Wen-Ming Zhang
Summary: This review provides an overview of recent studies on bio-inspired vibration isolators, categorizing key isolation mechanisms and performance characteristics to guide the design of new bio-inspired isolators for improved vibration isolation performance.
APPLIED MECHANICS REVIEWS
(2021)
Article
Acoustics
Han Meng, Xiuchang Huang, Yanyu Chen, Stephanos Theodossiades, Dimitrios Chronopoulos
Summary: This study investigates the effects of incorporating negative stiffness oscillators into continuous multilayered vibrating structures, comparing their performance against linear oscillators in a broadband sense.
Review
Engineering, Mechanical
Zhongxiang Yuan, Zhengguang Zhang, Lizhan Zeng, Xiaoqing Li
Summary: This paper provides a comprehensive review of recent advancements in microvibration isolation techniques, including passive, active, hybrid active-passive, and semi-active systems. The theoretical and experimental results of these techniques are explored. Passive approaches, known for their stability and lack of energy consumption, are commonly used in spacecraft. Active techniques are developed to isolate low-frequency vibrations. Hybrid active-passive methods combine the advantages of both passive and active systems. Semi-active techniques strike a balance between isolation performance and external energy input, making them adaptable to changes in the spacecraft environment.
NONLINEAR DYNAMICS
(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
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)
