Article
Acoustics
Yang Jin, Xin-Yu Jia, Qian-Qian Wu, Xiao He, Guo-Cai Yu, Lin-Zhi Wu, Bailu Luo
Summary: A vibration isolator is designed utilizing Bragg scattering and local resonance band gaps in a layered honeycomb meta-structure. A transfer matrix model is developed to understand the mechanism of band gap formation, and a strategy for designing an ultra-wide low-frequency coupled band gap is established analytically. Experimental results demonstrate the successful realization of an ultra-wide coupled band gap and the vibration isolation performance of the designed meta-structure.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Engineering, Mechanical
Gang Wang, Shaoke Wan, Jun Hong, Shuo Liu, Xiaohu Li
Summary: This paper presents modeling techniques and design strategies for local resonance elastic metamaterial beams with multiple resonators to improve vibration suppression properties over a wide frequency range. The effects of frequency spacing, damping, and mass ratio on the vibration attenuation characteristics are comprehensively investigated. The comparison of experimental and simulation results demonstrates the effectiveness of the proposed design strategies.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mathematics, Applied
Yu Xue, Jinqiang Li, Yu Wang, Fengming Li
Summary: This work investigates the working mechanism of meta-beam with periodically attached nonlinear coupling multi-frequency resonators for vibration suppression. The experimental results agree well with the theoretical analysis, and the study also explores the dispersion properties of coupling band gaps and the nonlinear dynamic behavior of a finite-sized meta-beam.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Engineering, Civil
Siting Hao, Hui Sheng, Xiaofei Lyu, Qian Ding
Summary: A novel two-dimensional locally resonant metastructure is proposed in this paper, which punches several concentric holes in the host plate filled with soft materials and installs a resonator in the center to achieve vibration suppression. The vibration attenuation performance is evaluated by numerical and experimental methods, and the formation mechanism of band gaps is revealed. This design has great potential for engineering applications.
ENGINEERING STRUCTURES
(2022)
Review
Mechanics
Nicolas Contreras, Xihong Zhang, Hong Hao, Francisco Hernandez
Summary: This paper provides a comprehensive review on the latest progress and potential applications of locally resonant metamaterials in civil engineering. The concepts and historical origins of metamaterials are introduced, along with the overview of analytical approaches and commonly used structures. Research gaps and future directions are also identified and discussed.
COMPOSITE STRUCTURES
(2024)
Article
Engineering, Mechanical
Nanfang Ma, Qiang Han, Sihao Han, Chunlei Li
Summary: A novel hierarchical re-entrant honeycomb structure named square re-entrant honeycomb (SRH) is proposed, which combines square unit cells with the re-entrant honeycomb (RH). The SRH demonstrates improved energy absorption capacity and vibration insulation compared to traditional RH structures. The dynamic crushing behavior of SRH structures is investigated theoretically and numerically, showing higher plateau stress and specific energy absorption (SEA) than RH. Additionally, the introduction of square unit cells expands the band gap and improves vibration isolation capability.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Mechanics
Koichi Mizukami, Takahiro Kawaguchi, Keiji Ogi, Yoichiro Koga
Summary: This study introduced locally resonant acoustic metamaterials made of continuous carbon-fiber-reinforced plastics for vibration attenuation. Designing unit cells compatible with high stiffness for low-frequency vibration attenuation was investigated. Numerical analysis showed that the band gap can be widened by an appropriate placement of carbon fibers in the unit cell, resulting in wider band gaps for carbon-fiber reinforced metastructures compared to structures without fibers. The experimental results of fabricated metamaterial samples were in good agreement with the numerical analysis, validating the effectiveness of the design approach.
COMPOSITE STRUCTURES
(2021)
Article
Acoustics
Hao Jin, Hongying Wang, Zheng Li, Xin Zhou
Summary: In this paper, a new type of rubber point-supported floating slab track is designed based on the local resonance theory. Through calculation and dynamic test, several conclusions are obtained, such as the dependence of the band gap of the point support structure on the vibration modes and the elastic modulus of the cladding layer, the increase of vibrator density can increase the bandwidth and reduce resonance frequencies, and local resonance type floating-slab track will be the development direction in the future.
JOURNAL OF VIBRATION AND CONTROL
(2023)
Article
Acoustics
Rixin Cui, Jinsong Zhou, Dao Gong
Summary: This study investigates the application of a damped rail with honeycomb phononic crystals in reducing the environmental vibration pollution caused by urban rail transit. It was found that adjusting the design parameters can affect the band gap property of honeycomb phononic crystals, and metals with heavy density can be used as scatterers for better vibration reduction effect. A filling fraction of around 0.5 and an elastic modulus of the matrix not exceeding 0.6 MPa can achieve a better absolute band gap.
SHOCK AND VIBRATION
(2021)
Article
Mechanics
Yingli Li, Hanqing Zhang
Summary: In this paper, a quasi-one-dimensional tetra-chiral metamaterial is proposed for low-frequency broadband vibration attenuation, inspired by 3D chiral compression-torsion coupling metamaterials. The introduction of chiral structure allows rotation and translation on a resonator for better vibration energy dissipation. The band gap characteristics and vibration attenuation properties are studied based on a discrete mass-spring model, with a focus on the dependencies on various parameters and the derivation of analytical boundary equations for band gaps. Multiple and ultra-wide band gaps can be achieved by adjusting the structural parameters. Through eigenstate modes investigation, mode reversals and veering at dispersion curves intersection are observed, revealing the interchange mechanism for dispersion curves boundary equations. Vibration transmission in finite unit cells validates the predicted high vibration attenuation frequency ranges, while movement energy analysis and wave packet propagation demonstrate the vibration attenuation characteristics of the proposed metamaterial. This study provides new ideas and theoretical guidance for metamaterial design.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Engineering, Mechanical
Pengcheng Zhao, Kai Zhang, Liyuan Qi, Zichen Deng
Summary: This paper investigates the dynamic properties of a 3D chiral mechanical metamaterial, showing that the isotactic configuration converts longitudinal waves into transverse waves due to chirality, leading to vibration attenuation independent of band gaps. Band gaps appear in the syndiotactic configuration's band structures, and the vibration mode of ligaments can be used to predict band gaps. The study also demonstrates the potential for practical applications of vibration suppression using gradient and programmable design.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Pengcheng Zhao, Kai Zhang, Liyuan Qi, Zichen Deng
Summary: This study established a dynamic model of a 3D chiral mechanical metamaterial to analyze the band structure and transmission response under different configurations. The results show that chirality can convert longitudinal waves into transverse waves, leading to vibration attenuation and the ability to predict band gaps.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Yingli Li, Nan Zhao, Shujian Yao
Summary: This study proposes a square-grid structure with inertial amplification mechanisms to achieve better vibration isolation at low frequencies and wide band gaps. The motion equations and dispersion relations of two different types of meta-structure are derived and discussed. The results show that ultra-low frequency vibration isolation and multiple local resonant band gaps can be achieved under certain conditions.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Acoustics
Zhan Zhang, Zhenhua Zhang, Xing Jin
Summary: This study introduces a new configuration of phononic crystal (NPC) composed of power-exponent prismatic phononic crystal (EPC) and cantilever beams, which effectively addresses the vibration problem in ship plate structures. By analyzing the dispersion curve, it is observed that NPC possesses complete flexural band gaps at low, medium, and high frequencies. The medium and high-frequency band gaps are the result of local resonance induced by the coupling of resonance in cantilever beams and energy concentration effect in the primary structure. The addition of cantilever beams allows EPC to generate low and medium-frequency band gaps while broadening the high-frequency band gap. Adjusting the parameters of both the cantilever beam and the power index prism enables the tuning of the low, medium, and high-frequency band gaps. The simulation and model tests conducted in this study validate the aforementioned conclusions. Compared to the traditional embedded ABH model, NPC offers greater flexibility in application without compromising structural strength, making it highly promising for ship structure engineering vibration control.
Article
Physics, Condensed Matter
Hong-yun Yang, Shu-liang Cheng, Xiao-feng Li, Qun Yan, Bin Wang, Ya-jun Xin, Yong-tao Sun, Qian Ding, Hao Yan, Ya-jie Li, Qing-xin Zhao
Summary: This paper proposes a new chiral lattice structure that can achieve low-frequency sound insulation or vibration reduction in engineering applications. Based on Bloch's theorem and finite element analysis, the energy band structures of different structures are calculated. The principle of band gap generation of Model No.1 is analyzed, and the effect of geometric parameters on the band gap is discussed. Additionally, the propagation characteristics of elastic waves with a specific frequency are explored. By verifying the relationship between finite element simulation of vibration transmission and the band gap frequency range in finite period structures, it is confirmed that the structure can effectively restrain vibration transmission. The research results show that the structure has excellent broadband gap performance in the frequency range of 3000 Hz and has a certain filtering effect on vibration transmission.
PHYSICA B-CONDENSED MATTER
(2023)
Article
Engineering, Mechanical
Lihong Yang, Xiao Han, Lijia Feng, Zongbing Chen, Guocai Yu, Jia Qu, Jinshui Yang, Linzhi Wu
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2020)
Article
Mechanics
Xiaojian Chen, Guocai Yu, Zengxian Wang, Lijia Feng, Linzhi Wu
Summary: This paper focuses on strengthening carbon fiber composite honeycombs through the design of curved wall topology to enhance their compressive strength. Experimental results show that the out-of-plane compressive strengths of the laminated CCCHs increase when the curvature radius decreases or the wall thickness increases. The laminated CCCHs demonstrate superior compressive strengths compared to existing competitive lightweight honeycombs, making them a potential lightweight sandwich structure for load-bearing components.
COMPOSITE STRUCTURES
(2021)
Article
Engineering, Mechanical
Yang Jin, Yan Shi, Guo-Cai Yu, Guang-Tao Wei, Bin Hu, Lin-Zhi Wu
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Mechanics
Zhengxian Liu, Weikai Zhao, Guocai Yu, Linzhi Wu
Summary: The study focused on the mechanical properties and electromagnetic parameters of quartz fiber composite honeycombs (QFCH) with different equivalent densities. The equivalent permittivity of QFCH was determined based on transmission efficiency, and the strengths under various loading conditions were predicted and measured. A failure mechanism map was established to predict the main failure modes, and numerical simulation was used to verify the accuracy. The QFCH showed potential as a 3-D metamaterial mechanical framework for new generation radomes.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Yao Zhang, Xinlei Fan, Jinqiang Li, Fengming Li, Guocai Yu, Runbo Zhang, Kaifeng Yuan
Summary: A novel pyramidal truss core metamaterial beam with embedded internal mass-spring resonators is designed for superior low-frequency vibration insulation performance. The location and width of the bandgap can be selected by tailoring the properties of the resonators. The pyramidal truss core metamaterial beam with multi-frequency resonators achieves much broader bandgaps than that with only a single array of resonators.
COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Weikai Zhao, Zhengxian Liu, Guocai Yu, Linzhi Wu
Summary: The paper addresses the poor thermal conduction performance of carbon fiber composite honeycomb structures and presents a fabrication strategy for a multifunctional carbon fiber honeycomb sandwich structure (MCFHS) that can effectively dissipate heat and bear loads. Theoretical models are developed to predict the thermal conductivity and strength of MCFHS, showing reasonable agreement with experiments. It is shown through experiments that MCFHS has excellent thermal and mechanical performance, with the potential to provide new opportunities for lightweight multifunctional honeycombs.
COMPOSITE STRUCTURES
(2021)
Article
Materials Science, Composites
Runbo Zhang, Zihan Li, Qiuyu Sun, Guocai Yu, Xintao Wang, Linzhi Wu
Summary: By designing and manufacturing carbon fiber tube reinforced polymer composite (CTPC), the mismatch in mechanical properties between traditional composite honeycombs in submersibles has been overcome. With high hydrostatic strength and lightweight characteristics, CTPC can be used as a new type of buoyancy material in submersibles.
COMPOSITES SCIENCE AND TECHNOLOGY
(2022)
Article
Acoustics
Yang Jin, Xin-Yu Jia, Qian-Qian Wu, Xiao He, Guo-Cai Yu, Lin-Zhi Wu, Bailu Luo
Summary: A vibration isolator is designed utilizing Bragg scattering and local resonance band gaps in a layered honeycomb meta-structure. A transfer matrix model is developed to understand the mechanism of band gap formation, and a strategy for designing an ultra-wide low-frequency coupled band gap is established analytically. Experimental results demonstrate the successful realization of an ultra-wide coupled band gap and the vibration isolation performance of the designed meta-structure.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Mechanics
Xin Liu, Qianqian Wu, Guocai Yu, Linzhi Wu
Summary: This study systematically investigates the failure behaviors and ultimate strength of ceramic cylindrical shells under hydrostatic pressure. The results show that increasing the thick-radius ratio or decreasing the length-radius ratio can effectively improve the structural tolerance pressure, and the conversion of failure modes is revealed by changing the geometrical parameters. This work provides engineering guidance for underwater pressure-resistant structural design.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Zengxian Wang, Xiaojian Chen, Guocai Yu, Jian Deng, Lijia Feng, Linzhi Wu
Summary: This paper studies the effect of surface treatment methods on the surface bonding strength of CFRP plates and demonstrates that surface microprinting technology (SMT) is an effective method. A mechanical model of CFRP honeycomb structure is established, and the theoretical formula for shear strength is deduced. The experimental results show that SMT can greatly improve the shear strength of CFRP honeycomb sandwich structure and provide technical database and guidelines for its application in the aerospace and aeronautical fields.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Multidisciplinary
Zhengxian Liu, Shijie Wang, Jizheng Shao, Weikai Zhao, Guocai Yu, Linzhi Wu
Summary: Multifunctional structures with excellent microwave absorption performance and mechanical properties have recently gained attention. In this research, a novel absorption structure was designed and fabricated, combining a composite hierarchical grid structure with a 3D absorption metamaterial. The absorption bandwidth and mechanical properties of the structure were investigated and demonstrated to have broad absorption capabilities and effective load bearing.
COMPOSITES PART B-ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Yuwei Liu, Guocai Yu, Gongwang Cao, Chuang Wang, Zhenyao Wang
Summary: The study investigated the corrosion products formed on tin-bronze exposed to industry atmosphere for 29 years. The corrosion rate of tin-bronze was found to be 0.56 μm·a(-1). It was observed that tin-bronze had two different structures on the exposure sides, with an uneven and cracked corrosion product layer on the skyward side, and a double-layer structure with a dense inner layer and porous outer layer on the fieldward side. Sn distribution in the corrosion product layer was uniform on the skyward side and concentrated near the substrate on the fieldward side.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Engineering, Mechanical
Weikai Zhao, Guocai Yu, Shuang Li, Zhengxian Liu, Linzhi Wu
Summary: This study proposes and manufactures a multifunctional structure with load-bearing and thermal management abilities, achieved by combining shape-stabilized phase change material with carbon fiber reinforced plastic (CFRP). The load-bearing ability is investigated using the Winkler foundation model, and 3D failure mechanism maps are constructed to study the dominant failure modes. The thermal management ability is examined using thermal rate capability and Ragone plots under different thermal loads. The study elucidates the influence of physical properties of phase change materials and geometric parameters on thermal management ability, and illustrates the trade-off between load-bearing and thermal management abilities through specific strength-specific energy curves.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2023)
Article
Engineering, Multidisciplinary
Feng LiJia, Yu GuoCai, Ma Li, Wu LinZhi, Zhang AMan
SCIENCE CHINA-TECHNOLOGICAL SCIENCES
(2020)
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)
