Article
Acoustics
Ge Yan, Zhi-Yuan Wu, Xin-Sheng Wei, Sen Wang, Hong-Xiang Zou, Lin-Chuan Zhao, Wen-Hao Qi, Wen-Ming Zhang
Summary: Various quasi-zero stiffness (QZS) vibration isolators have been successfully applied in low-frequency vibration isolation in recent years. However, the current approach is limited to compensating the negative stiffness of bistable structures using linear springs. This study proposes a nonlinear compensation method and verifies its effectiveness through a confirmatory system.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Chemistry, Multidisciplinary
Quan Zhang, Dengke Guo, Gengkai Hu
Summary: A new design strategy for a programmable quasi-zero-stiffness (QZS) mechanical metamaterial is proposed in this research, which can achieve tailored stair-stepping force-displacement curves with multiple QZS working ranges and ultra-low frequency vibration isolation capability. The mechanism solely depends on the structural geometry of curved beams and is materials-independent, opening up a new avenue for innovating compact and scalable QZS isolators.
ADVANCED FUNCTIONAL MATERIALS
(2021)
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
Acoustics
Jia-Jia Lu, Ge Yan, Wen-Hao Qi, Han Yan, Jun-Wei Shi, Ao Chen, Wen-Ming Zhang
Summary: In this study, a load-adaptive electromagnetic QZS vibration isolator (LEQVI) is proposed, which can achieve a wide vibration isolation bandwidth and effective vibration attenuation by flexibly adjusting its rated load through regulating the excitation current.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Mechanical
Chen Zhang, Junsen He, Guiqian Zhou, Kai Wang, Daolin Xu, Jiaxi Zhou
Summary: The study proposes a compliant quasi-zero-stiffness (CQZS) isolator to isolate low-frequency torsional vibrations in the shaft system. The configuration of the CQZS isolator is devised using a compliant mechanism, and its stiffness characteristics are deduced and verified analytically and numerically. A dynamic model of the shaft system integrated with the CQZS isolator is established, and theoretical analysis is conducted using the harmonic balance method. Experimental results confirm the effectiveness of the CQZS isolator in achieving ideal torsional quasi-zero-stiffness characteristics and low-frequency torsional vibration isolation. The proposed CQZS isolator is more compact, lightweight, and easier to manufacture than conventional isolators.
MECHANISM AND MACHINE THEORY
(2023)
Review
Engineering, Electrical & Electronic
Zhaozhao Ma, Ruiping Zhou, Qingchao Yang
Summary: This paper comprehensively reviews recent research on quasi-zero stiffness (QZS) vibration isolators, focusing on their principle, structural design, and vibration isolation performance. The paper also summarizes the development trends and challenges of QZS vibration isolators, as well as the advantages of passive and active/semi-active systems.
Article
Engineering, Mechanical
Lei Deng, Shuaishuai Sun, Qihao Wu, Ning Gong, Jiang Yang, Shiwu Zhang, Haiping Du, Weihua Li
Summary: This study develops a highly stable quasi-zero stiffness (QZS) vibration isolation system integrated with magnetorheological fluids (MRFs) to overcome the unstable problem of QZS systems and expand their application range.
NONLINEAR DYNAMICS
(2023)
Article
Thermodynamics
Chaoran Liu, Rui Zhao, Kaiping Yu, Heow Pueh Lee, Baopeng Liao
Summary: A novel quasi-zero-stiffness (QZS) device is proposed for vibration isolation and energy harvesting by converting vibrational energy into electrical energy and reducing energy transmitted to the vibration receiver. Experimental results demonstrate the device's advantages of low isolation frequency and high energy output.
Article
Mathematics, Applied
Chaoran Liu, Kaiping Yu, Baopeng Liao, Rongping Hu
Summary: This paper focuses on enhancing the QZS isolator by introducing tunable nonlinear inerter (TNI) to improve low-frequency isolation performance. Analytical calculations, stability analysis, and numerical simulations were conducted to compare the isolation performances of the QZS isolator and the QZS-TNI isolator. Results show that adding the inerter considerably suppresses the bending trend of the transmissibility curve, leading to a wider frequency range of isolation and a lower peak transmissibility.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Engineering, Multidisciplinary
Chaoran Liu, Rui Zhao, Kaiping Yu, Heow Pueh Lee, Baopeng Liao
Summary: A novel energy harvesting device is proposed in this paper, based on vibration localization to reduce the force transmitted to the base, achieving simultaneous energy harvesting and vibration isolation. The device consists of a quasi-zero stiffness support and piezoelectric cantilever beams, allowing for flexible enhancement of energy harvesting performance by adjusting key parameters.
APPLIED MATHEMATICAL MODELLING
(2021)
Article
Engineering, Mechanical
Yuntian Zhang, Qingjie Cao, Wenhu Huang
Summary: This paper investigates bursting oscillations in a vibration isolation system with quasi-zero stiffness to improve efficiency and reliability. The complex nonlinear dynamics are studied through bifurcation analysis, and an approximation method for force transmissibility is proposed. The results show that bursting is caused by transitions from equilibrium to limit cycle and equilibrium jumping, with the weakest bursting occurring when the system behaves in a single equilibrium state.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Yuanhao Xiong, Fengming Li, Yu Wang
Summary: This article proposes a novel nonlinear quasi-zero-stiffness (QZS) vibration isolation system with high load carrying capacity. By connecting an X-shaped structure with a platform, the quasi-zero-stiffness vibration isolation system with additional X-shaped structure (X-QZS) is designed. The relationships of system restoring force and stiffness related to displacement are obtained by static modelling and the influences of the parameters on the system stiffness are analyzed. In the dynamic analysis, the amplitude-frequency characteristics and transmissibility curves are calculated. Numerical simulations and vibration experiments verify the accuracy of the calculation results. The designed X-QZS system exhibits a wide QZS interval, a small unstable interval, a low jump-down frequency, and a high load carrying capacity.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Srajan Dalela, P. S. Balaji, D. P. Jena
Summary: This paper introduces a metastructure-based vibration isolation model with high static and low dynamic stiffness properties to enhance isolation effectiveness of small-scale equipment under low-frequency excitations. The quasi-zero-stiffness (QZS) effect is achieved through the snap-through behavior of cosine beam systems and bending-dominated behavior of semicircular arches within each unit cell. Analytical and numerical studies as well as experimental validation confirm the static and dynamic characteristics of the proposed metastructure, showing lower transmissibility and wider isolation range compared to a linear model. The parametric study reveals that motion transmissibility decreases with decreasing damping ratio in the low-frequency region, while increasing damping ratio leads to wider effective isolation range. Stability analysis shows the unstable region in the frequency response curve reduces with higher damping ratio and is independent of excitation amplitude.
NONLINEAR DYNAMICS
(2022)
Article
Engineering, Civil
Jing Bian, Xuhong Zhou, Ke Ke, Michael C. H. Yam, Yuhang Wang, Zi Gu, Miaojun Sun
Summary: This study proposes a passive prismatic-shaped isolation platform (PIP) to achieve enhanced quasi-zero stiffness (QZS) effect. The design concept uses a horizontal spring to generate tunable negative stiffness and installs oblique springs inside the cells of the prismatic structure to provide tunable positive stiffness, thus achieving the QZS effect by combining the negative and positive stiffness.
SMART STRUCTURES AND SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Lei Xu, Zhihai Xiang
Summary: By using a compact W-shaped compliant mechanism with direct quasi-zero stiffness, energy can be efficiently extracted from low-frequency vibration environments, and the device can also be used as a low-frequency vibration isolator.
SENSORS AND ACTUATORS A-PHYSICAL
(2022)
Article
Engineering, Mechanical
Xinlong Wang, Jiaxi Zhou, Daolin Xu, Huajiang Ouyang, Yong Duan
NONLINEAR DYNAMICS
(2017)
Article
Engineering, Mechanical
Kai Wang, Jiaxi Zhou, Daolin Xu
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2017)
Article
Physics, Applied
Jiaxi Zhou, Kai Wang, Daolin Xu, Huajiang Ouyang
JOURNAL OF APPLIED PHYSICS
(2017)
Article
Acoustics
Jiaxi Zhou, Qingyu Xiao, Daolin Xu, Huajiang Ouyang, Yingli Li
JOURNAL OF SOUND AND VIBRATION
(2017)
Article
Acoustics
Jiaxi Zhou, Kai Wang, Daolin Xu, Huajiang Ouyang, Yimei Fu
JOURNAL OF VIBRATION AND CONTROL
(2018)
Article
Physics, Applied
Kai Wang, Jiaxi Zhou, Daolin Xu, Huajiang Ouyang
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Engineering, Mechanical
Jiaxi Zhou, Lingling Dou, Kai Wang, Daolin Xu, Huajiang Ouyang
NONLINEAR DYNAMICS
(2019)
Article
Physics, Applied
Kai Wang, Jiaxi Zhou, Qiang Wang, Huajiang Ouyang, Daolin Xu
APPLIED PHYSICS LETTERS
(2019)
Article
Engineering, Mechanical
Kai Wang, Jiaxi Zhou, Daolin Xu, Huajiang Ouyang
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2019)
Article
Engineering, Multidisciplinary
Kai Wang, Jiaxi Zhou, Changqi Cai, Daolin Xu, Huajiang Ouyang
APPLIED MATHEMATICAL MODELLING
(2019)
Article
Engineering, Civil
Jie Liu, Haifeng Ou, Rong Zeng, Jiaxi Zhou, Kai Long, Guilin Wen, Yi Min Xie
THIN-WALLED STRUCTURES
(2019)
Article
Mechanics
Changqi Cai, Jiaxi Zhou, Linchao Wu, Kai Wang, Daolin Xu, Huajiang Ouyang
COMPOSITE STRUCTURES
(2020)
Article
Engineering, Mechanical
Kai Wang, Jiaxi Zhou, Huajiang Ouyang, Li Cheng, Daolin Xu
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Acoustics
Jiaxi Zhou, Kai Wang, Daolin Xu, Huajiang Ouyang, Yingli Li
JOURNAL OF VIBRATION AND ACOUSTICS-TRANSACTIONS OF THE ASME
(2017)
Article
Engineering, Mechanical
Xuanen Kan, Yanjun Lu, Fan Zhang, Weipeng Hu
Summary: A blade disk system is crucial for the energy conversion efficiency of turbomachinery, but differences between blades can result in localized vibration. This study develops an approximate symplectic method to simulate vibration localization in a mistuned bladed disk system and reveals the influences of initial positive pressure, contact angle, and surface roughness on the strength of vibration localization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zimeng Liu, Cheng Chang, Haodong Hu, Hui Ma, Kaigang Yuan, Xin Li, Xiaojian Zhao, Zhike Peng
Summary: Considering the calculation efficiency and accuracy of meshing characteristics of gear pair with tooth root crack fault, a parametric model of cracked spur gear is established by simplifying the crack propagation path. The LTCA method is used to calculate the time-varying meshing stiffness and transmission error, and the results are verified by finite element method. The study also proposes a crack area share index to measure the degree of crack fault and determines the application range of simplified crack propagation path.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Rongjian Sun, Conggan Ma, Nic Zhang, Chuyo Kaku, Yu Zhang, Qirui Hou
Summary: This paper proposes a novel forward calculation method (FCM) for calculating anisotropic material parameters (AMPs) of the motor stator assembly, considering structural discontinuities and composite material properties. The method is based on multi-scale theory and decouples the multi-scale equations to describe the equivalence and equivalence preconditions of AMPs of two scale models. The effectiveness of this method is verified by modal experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Zhang, Jiangcen Ke
Summary: This research introduces an intelligent scheduling system framework to optimize the ship lock schedule of the Three Gorges Hub. By analyzing navigational rules, operational characteristics, and existing problems, a mixed-integer nonlinear programming model is formulated with multiple objectives and constraints, and a hybrid intelligent algorithm is constructed for optimization.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Jingjing He, Xizhong Wu, Xuefei Guan
Summary: A sensitivity and reliability enhanced ultrasonic method has been developed in this study to monitor and predict stress loss in pre-stressed multi-layer structures. The method leverages the potential breathing effect of porous cushion materials in the structures to increase the sensitivity of the signal feature to stress loss. Experimental investigations show that the proposed method offers improved accuracy, reliability, and sensitivity to stress change.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Benyamin Hosseiny, Jalal Amini, Hossein Aghababaei
Summary: This paper presents a method for monitoring sub-second or sub-minute displacements using GBSAR signals, which employs spectral estimation to achieve multi-dimensional target detection. It improves the processing of MIMO radar data and enables high-resolution fast displacement monitoring from GBSAR signals.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xianze Li, Hao Su, Ling Xiang, Qingtao Yao, Aijun Hu
Summary: This paper proposes a novel method for bearing fault identification, which can accurately identify faults with few samples under complex working conditions. The method is based on a Transformer meta-learning model, and the final result is determined by the weighted voting of multiple models.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaomeng Li, Yi Wang, Guangyao Zhang, Baoping Tang, Yi Qin
Summary: Inspired by chaos fractal theory and slowly varying damage dynamics theory, this paper proposes a new health monitoring indicator for vibration signals of rotating machinery, which can effectively monitor the mechanical condition under both cyclo-stationary and variable operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Hao Wang, Songye Zhu
Summary: This paper extends the latching mechanism to vibration control to improve energy dissipation efficiency. An innovative semi-active latched mass damper (LMD) is proposed, and different latching control strategies are tested and evaluated. The latching control can optimize the phase lag between control force and structural response, and provide an innovative solution to improve damper effectiveness and develop adaptive semi-active dampers.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Menghao Ping, Xinyu Jia, Costas Papadimitriou, Xu Han, Chao Jiang, Wang-Ji Yan
Summary: Identification of non-Gaussian processes is a challenging task in engineering problems. This article presents an improved orthogonal series expansion method to convert the identification of non-Gaussian processes into a finite number of non-Gaussian coefficients. The uncertainty of these coefficients is quantified using polynomial chaos expansion. The proposed method is applicable to both stationary and nonstationary non-Gaussian processes and has been validated through simulated data and real-world applications.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Lei Li, Wei Yang, Dongfa Li, Jianxin Han, Wenming Zhang
Summary: The frequency locking phenomenon induced by modal coupling can effectively overcome the dependence of peak frequency on driving strength in nonlinear resonant systems and improve the stability of peak frequency. This study proposes the double frequencies locking phenomenon in a three degrees of freedom (3-DOF) magnetic coupled resonant system driven by piezoelectricity. Experimental and theoretical investigations confirm the occurrence of first frequency locking and the subsequent switching to second frequency locking with the increase of driving force. Furthermore, a mass sensing scheme for double analytes is proposed based on the double frequencies locking phenomenon.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Kai Ma, Jingtao Du, Yang Liu, Ximing Chen
Summary: This study explores the feasibility of using nonlinear energy sinks (NES) as replacements for traditional linear tuned mass dampers (TMD) in practical engineering applications, specifically in diesel engine crankshafts. The results show that NES provides better vibration attenuation for the crankshaft compared to TMD under different operating conditions.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Wentao Xu, Li Cheng, Shuaihao Lei, Lei Yu, Weixuan Jiao
Summary: In this study, a high-precision hydraulic mechanical stand and a vertical mixed-flow pumping station device were used to conduct research on cavitation signals of mixed-flow pumps. By analyzing the water pressure pulsation signal, it was found that the power spectrum density method is more sensitive and capable of extracting characteristics compared to traditional time-frequency domain analysis. This has significant implications for the identification and prevention of cavitation in mixed-flow pump machinery.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Xiaodong Chen, Kang Tai, Huifeng Tan, Zhimin Xie
Summary: This paper addresses the issue of parasitic motion in microgripper jaws and its impact on clamping accuracy, and proposes a symmetrically stressed parallelogram mechanism as a solution. Through mechanical modeling and experimental validation, the effectiveness of this method is demonstrated.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)
Article
Engineering, Mechanical
Zhifeng Shi, Gang Zhang, Jing Liu, Xinbin Li, Yajun Xu, Changfeng Yan
Summary: This study provides useful guidance for early bearing fault detection and diagnosis by investigating the effects of crack inclination and propagation direction on the vibration characteristics of bearings.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2024)