Article
Engineering, Mechanical
Hulun Guo, Tianzhi Yang, Yushu Chen, Li-Qun Chen
Summary: This study focuses on the classification of different kinds of periodic responses of a linear oscillator coupled with a nonlinear energy sink (NES) under harmonic excitation. By using the harmonic balance method and the singularity theory, the amplitudes of periodic responses and their classification are obtained.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Qingye Meng, Lei Hou, Rongzhou Lin, Yi Chen, Gengshuo Cui, Wenhao Shi, Yushu Chen
Summary: This paper directly analyzes the dynamic characteristics of a quasi-zero-stiffness (QZS) vibration isolator using the modified incremental harmonic balance (IHB) method. The analysis results differ from previous approximate equation results, indicating that the system does not exhibit unbounded response under displacement excitation, even harmonics and constant terms exist in the response, and there is subharmonic resonance in the case of small damping and large excitation, reducing the vibration isolation performance of the system.
NONLINEAR DYNAMICS
(2023)
Article
Engineering, Mechanical
Zhenghan Zhu, Yong Wang, Yu Wang, Xingjian Jing
Summary: This paper presents the development of a new inertial design mechanism integrated with an X-shaped anti-vibration mechanism. The results show that this design allows for larger excitation displacement, adjustable inertial ratio, and reduced vibration transmissibility and resonant peak. The study also discovers three different types of nonlinear inertia coupling with X-shaped mechanisms, providing better vibration isolation performance at low frequencies. The study concludes that this new insight into the application of nonlinear inertia can lead to improved vibration suppression or isolation in engineering systems.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Xingjian Jing, Zhenghan Zhu, Yingqing Guo, Shaohua Liu
Summary: The effects of nonlinear inertia are investigated and verified through prototyping and experimental validation. A new inertia unit integrated within an X-shaped mechanism can produce 3 different types of nonlinear inertia, with different influences on dynamic response. Parametric and performance indicators are proposed to identify and assess different types of nonlinearities and improvement in performance compared to linear counterparts. The results provide a comprehensive understanding of nonlinear inertia and its effects, with significant implications for engineering applications.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Ke-Fan Xu, Mu-Qing Niu, Ye -Wei Zhang, Cun-Ying Meng, Li-Qun Chen
Summary: A novel nonlinear energy sink with active varying stiffness (NES-AVS) is proposed for reducing the mass of the conventional NES and enhancing the vibration reduction effects in spacecraft structures. Experimental and theoretical analysis demonstrate that the NES-AVS has better vibration reduction effects compared to the conventional NES and its mass is reduced by 90%.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Mathematics, Applied
Chang -song Zhu, Xue-qian Fang, Jin-xi Liu
Summary: This paper investigates the relationship between the nonlinear free vibration behavior and nonlinear forced vibration behavior of viscoelastic plates based on Reddy higher order shear deformation theory and von Karman geometric nonlinearity assumption. The Kelvin-Voigt viscoelastic model is used to describe the viscoelasticity of the plate. The elastic potential energy, kinetic energy, and virtual work done by external force and viscous damping force are obtained based on the geometric equations and constitutive equations. The nonlinear governing differential equations of the system are derived using Hamilton's principle. The nonlinear free vibration responses and nonlinear forced vibration responses of the system are presented using the harmonic balance method and Runge-Kutta method. The major finding of this study is that the nonlinear frequency ratio derived from the nonlinear free vibration is in good agreement with the resonant frequency ratio obtained from the nonlinear forced vibration, and the viscous damping coefficient has little effect on the nonlinear frequency ratio.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2023)
Article
Chemistry, Multidisciplinary
Wen-Yong Zhang, Mu-Qing Niu, Li-Qun Chen
Summary: In this study, the vibration reduction performances of multiple parallel nonlinear energy sinks are investigated based on the Timoshenko beam theory. It is found that multiple parallel nonlinear energy sinks can achieve a larger vibration reduction ratio than a single nonlinear energy sink with the same total mass. The parameter influences and unstable responses of the nonlinear energy sinks are revealed, and the optimal locations and cubic stiffness are related to the number of nonlinear energy sinks.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Samuel Quaegebeur, Nicolas Di Palma, Benjamin Chouvion, Fabrice Thouverez
Summary: The purpose of this paper is to study how internal resonances can be used to mitigate the vibration of cyclically symmetric systems exhibiting geometrical nonlinear effects. The novelty of this method is confirmed through numerical investigations, and an application to decrease the vibration of the system is proposed. Through simulations, an effective range of amplitude excitation is defined to obtain internal resonances leading to an overall vibration mitigation of the system.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Krystian Polczynski, Sergii Skurativskyi, Maksymilian Bednarek, Jan Awrejcewicz
Summary: This study investigates the nonlinear forced vibrations of two pendulums coupled by an elastic element, with one pendulum driven by magnetic stimulus. A rational approximation of the magnetic torque enables numerical and analytical studies, focusing on resonant phenomena and periodic regimes. The technique of successive maxima map is employed to study complex regimes, revealing changes in profile shapes and strongly chaotic trajectories at different driving frequencies.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Mechanical
Chao Fu, Zhaoli Zheng, Weidong Zhu, Kuan Lu, Yongfeng Yang
Summary: This paper investigates the propagation of uncertainties in nonlinear vibrations of a rotor system with local nonlinearities and proposes a non-intrusive surrogate modeling method. Through comprehensive case studies and numerical validations, it is shown that the proposed method can effectively predict the vibrational behavior of nonlinear rotor systems with bounded uncertainties.
NONLINEAR DYNAMICS
(2022)
Article
Computer Science, Interdisciplinary Applications
Kwangchol Kim, Kwangchol Ri, Cholil Yun, Yongson Jong, Poknam Han
Summary: The paper proposes a methodology that combines the incremental harmonic balance (IHB) method and the Alternating Frequency/Time (AFT) method for interpreting the stability of solutions and nonlinear vibrations in nonlinear systems. By using a transformation matrix, the calculated nonlinear force matrix and its derivative matrix are transformed into matrices that can be used in the IHB method. The effectiveness of the proposed method is demonstrated through three example problems.
COMPUTERS & STRUCTURES
(2022)
Article
Engineering, Mechanical
Wenhu Dang, Shuanglong Liu, Liqun Chen, Tianzhi Yang
Summary: In this study, a dual-stage inerter-enhanced NES (IE-NES) is proposed for substantial transmissibility reduction with tunable performance. Computational results demonstrate good agreement between the analytical and numerical solutions. Parametric studies suggest that the inertance of inerters attached to the different NES masses has diverse effects on the vibration mitigation capacity of the IE-NES system.
NONLINEAR DYNAMICS
(2023)
Article
Acoustics
Guoqing Jiang, Yu Wang, Fengming Li, Xingjian Jing
Summary: A novel integrated nonlinear passive vibration control system is proposed, combining a bio-inspired isolator and a non-linear energy sink, which can achieve excellent vibration isolation and reduce resonance amplitude in low-frequency bands. Experimental validation of the superior vibration reduction properties of the system was conducted, and the design methodology was elaborated for practical applications, providing an innovative method for vibration control in various engineering practices.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Mechanical
Haiqin Li, Ang Li, Xianren Kong
Summary: The study investigates a bistable nonlinear energy sink (BNES) for passive vibration control of beam and plate structures, discussing the frequency and amplitude response trends and outlining a simple design rule. Results show that compared to traditional cubic nonlinear energy sinks, BNES performs better in terms of both frequency and amplitude.
NONLINEAR DYNAMICS
(2021)
Article
Engineering, Mechanical
Yongheng Yu, Fengming Li, Guo Yao
Summary: To achieve broad-range vibration isolation, an X-shaped structure is integrated into a two-stage vibration isolation system. The Lagrange equation is used to establish the nonlinear equation of motion for the proposed X-shaped two-stage isolator, considering both rotational and vertical displacements. The effects of key parameters on frequency response characteristics and vibration isolation frequency bands are examined using the incremental harmonic balance method. The investigation validates the correctness and feasibility of the analytical approach, and reveals the possibility of low-frequency isolation and the influence of softening nonlinearity.
NONLINEAR DYNAMICS
(2023)
Article
Multidisciplinary Sciences
Xiuhua Shang, Peijian Zhang, Guo Liu, Ni Zhan, Zhihua Wu
Summary: This study conducted RNA-seq analysis on two genotypes of Eucalyptus camaldulensis to identify wind-resistance genes and transcription factors. The results showed that the expression of genes and pathways related to cell wall biosynthesis, cellulose, and lignin synthesis were significantly altered in response to wind stress.
Article
Chemistry, Multidisciplinary
Wei Gong, Yang Guo, Weifeng Yang, Zhihua Wu, Ruizhe Xing, Jin Liu, Wei Wei, Jie Zhou, Yinben Guo, Kerui Li, Chengyi Hou, Yaogang Li, Qinghong Zhang, Michael D. Dickey, Hongzhi Wang
Summary: Electronic textiles are important for wearable electronics, but the electronic waste they produce adds to pollution. A new green electronic textile has been developed using renewable materials and is highly durable, degradable, and comfortable. It also enables wireless power supply and has excellent breathability and temperature control.
Article
Mechanics
Zhihua Wu, Yimin Zhang, Guo Yao
Summary: This paper investigates the natural frequency and stability of axially moving functionally graded carbon nanotube-reinforced composite (FG-CNTRC) rectangular thin plates. The study derives the equations of motion for the plates and analyzes the variations of natural frequencies with axial moving velocity, as well as the stability of the plates. The effects of various parameters on the natural frequencies and stability are discussed.
Article
Chemistry, Multidisciplinary
Quan Wang, Yi Duan, Hongshu Jing, Zhihua Wu, Yu Tian, Ke Gong, Qianqian Guo, Jiali Zhang, Ying Sun, Zhaojun Li, Yourong Duan
Summary: The researchers designed a low molecular weight heparin-unsaturated fatty acid conjugate (LMWH-uFA) that acted as an antiatherosclerotic agent and a nanocarrier. This conjugate could regulate blood lipids and inhibit inflammation, leading to better therapeutic effects. In an atherosclerosis mouse model, the drug significantly reduced plaque area and showed promising curative effects.
JOURNAL OF CONTROLLED RELEASE
(2023)
Article
Plant Sciences
Zhihua Wu, Zhenbo Jiang, Zhijun Li, Peipei Jiao, Juntuan Zhai, Shuo Liu, Xiaoli Han, Shanhe Zhang, Jianhao Sun, Zhongshuai Gai, Chen Qiu, Jindong Xu, Hong Liu, Rui Qin, Rui Lu
Summary: This study revealed the significant functional divergence of heteromorphic leaves in Populus euphratica and identified the differential regulation of gene expression and DNA epigenetics in the development and functional adaptation of these leaves. The study also found that the development and functional divergence of heteromorphic leaves were regulated by differentially expressed genes, DNA methylation, chromatin accessibility, and 3D genome remodeling. This research provides valuable insights into the adaptive evolution of heteromorphic leaves in Populus euphratica.
Article
Chemistry, Multidisciplinary
Liting Wang, Hao Fu, Liwei Song, Zhihua Wu, Jian Yu, Qianqian Guo, Chuanrong Chen, Xupeng Yang, Jiali Zhang, Quan Wang, Yourong Duan, Yunhai Yang
Summary: This study proposes a nanocatalytic sensitizer that efficiently inhibits tumor growth and metastasis of AZD9291-resistant NSCLC by delivering multiple substances. The results highlight the potential of this method to overcome critical resistance and inhibit metastasis.
Article
Automation & Control Systems
Zhihua Wu, Engang Tian, Hongtian Chen
Summary: This article investigates the security issues when electric vehicles (EVs) are incorporated into the load frequency control (LFC) system. It proposes a networked LFC system and an H-infinity sliding mode observer (SMO) to accurately estimate the internal physical state of the system. Additionally, a dual time-varying coding detection scheme and algorithm are established to detect and disclose covert attacks.
IEEE-ASME TRANSACTIONS ON MECHATRONICS
(2023)
Article
Genetics & Heredity
Zhihua Wu, Tiange Yang, Rui Qin, Hong Liu
Summary: In this study, the mitogenome of safflower (Carthamus tinctorius) was analyzed and reported. The safflower mitogenome consisted of two circular chromosomes, with a total length of 321,872 bp, and encoded 55 unique genes. The phylogenetic tree based on mitogenome PCGs revealed a closer relationship between safflower and three Cardueae species, similar to the phylogeny constructed from plastid genomes.
Article
Multidisciplinary Sciences
Zhihua Wu, Xiuhua Shang, Guo Liu, Yaojian Xie
Summary: This study investigated the differences in secondary metabolites among five mangrove species, focusing on the total contents of flavonoids and polyphenols, as well as the types and contents of volatiles in the leaves, roots, and stems. A gas chromatography-mass spectrometry (GC-MS) method detected a total of 532 volatile compounds in the different parts of the five mangrove species. Analysis and comparison revealed significant differences in compound content and composition between species and parts. The correlation analysis demonstrated the relationship between the content of flavonoids/phenolics, the number of compounds, and the salt and waterlogging tolerance levels of mangrove plants.
Article
Chemistry, Multidisciplinary
Yijie Qiu, Zhihua Wu, Yanling Chen, Jinghan Liao, Qi Zhang, Quan Wang, Yi Duan, Ke Gong, Sheng Chen, Liting Wang, Peili Fan, Yourong Duan, Wenping Wang, Yi Dong
Summary: This study introduces a nano ultrasound contrast agent (ATO/PFH NPs@Au-cRGD) that integrates diagnosis and treatment for efficient ultrasound imaging and liver cancer therapy. The nanodrug delivery system promotes the release of tumor-associated antigens, enhances the synergistic effects of ATO and photothermal therapy, and activates the antitumor immune response. Additionally, when combined with anti-PD-L1 immunotherapy, the system inhibits tumor metastasis and establishes long-term immunological memory.
Article
Environmental Sciences
Zhihua Wu, Wenbo Rao, Fangwen Zheng, Chi Zhang, Tianning Li
Summary: The study conducted a 5-year water quality monitoring of the lower West Main Canal in the Ganfu Plain irrigation district to identify the levels and sources of nitrogen and phosphorus. The results showed a risk of eutrophication with high concentrations of total phosphorus and total nitrogen. The sources of pollution varied between wet and dry seasons, with agricultural activities and livestock-poultry breeding playing significant roles.
ENVIRONMENTAL MONITORING AND ASSESSMENT
(2023)
Article
Biochemistry & Molecular Biology
Tiange Yang, Zhihua Wu, Jun Tie, Rui Qin, Jiangqing Wang, Hong Liu
Summary: In this study, the chloroplast genomes of Chrysosplenium species were analyzed to gain insights into their phylogenetic position and evolutionary characteristics. The results showed that the chloroplast genomes of Chrysosplenium species were conserved in terms of structure and gene content, but varied in size and boundaries. Phylogenetic analysis supported the monophyletic nature of Chrysosplenium species and identified distinct branches within the genus. Furthermore, potential DNA barcodes for species identification were identified, and positive selection was detected in specific genes. These findings enhance our understanding of the evolution and origin of Chrysosplenium species.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Chemistry, Multidisciplinary
Yu Tian, Hongshu Jing, Quan Wang, Suxian Hu, Zhihua Wu, Yourong Duan
Summary: By combining pH-sensitive dissolving microneedles (dMNs) and melanoma-targeting liposomes, the delivery system (si/DOX@LRGD dMNs) enhances the chemoimmunotherapy of melanoma by co-delivering DOX and siPD-L1.
JOURNAL OF CONTROLLED RELEASE
(2023)
Article
Biochemical Research Methods
Junda Li, Zhihua Wu, Ziyi Zhang, Yang Liu, Huirong Liu
Summary: This study compared the effects of primers, PCR approaches, and sample preservation methods on the diversity studies of myxobacteria using Illumina high-throughput sequencing. The results showed that using the myxobacteria semi-specific primers, touch-down PCR, and dry preservation of samples were more conducive to the diversity studies of myxobacteria.
JOURNAL OF MICROBIOLOGICAL METHODS
(2023)
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)
