Article
Computer Science, Interdisciplinary Applications
Mahsa Najafi, Isa Ahmadi
Summary: In this paper, an efficient method based on nonlocal elasticity theory and Layerwise theory is proposed for the analysis of bending, buckling, and vibration of functionally graded nanobeam. The method takes into account the transverse shear and normal strains of nanobeam and the small-scale effect. The proposed theory is validated by comparing with other theories and shows accurate results in predicting vibration, buckling, and bending of nanobeams.
ENGINEERING WITH COMPUTERS
(2023)
Article
Computer Science, Interdisciplinary Applications
Mahmood Fakher, Shahrokh Hosseini-Hashemi
Summary: Considering the size effects of nanostructures, employing the two-phase local/nonlocal elasticity has recently gained attention in nano-mechanics research. This study provides the exact solution for the vibrations of two-phase Timoshenko nanobeams and investigates the shear-locking problem in the case of two-phase finite-element method (FEM). It aims to create an efficient locking-free local/nonlocal FEM with a simple and efficient beam element.
ENGINEERING WITH COMPUTERS
(2022)
Article
Mechanics
Pei Zhang, Peter Schiavone, Hai Qing
Summary: This article presents a hygro-thermal-damping vibration analysis of two-variable shear deformation beams supported by a visco-Pasternak foundation. The effects of simultaneously applying stress-driven nonlocal assumptions on the foundation and hygro-thermal load in the undamped and damping vibration of the shear deformation beams are examined.
COMPOSITE STRUCTURES
(2023)
Article
Mechanics
Hossein Darban, Raimondo Luciano, Andrea Caporale, Michal Basista
Summary: This paper formulates a novel buckling model for nanobeams resting on the Pasternak elastic foundation based on the local-nonlocal stress-driven gradient elasticity theory. The model accurately predicts the buckling loads and mode shapes of the nanobeams, and captures both stiffening and softening behaviors at small scales.
COMPOSITE STRUCTURES
(2022)
Article
Mechanics
Fan Yang, Xianlai Song, Xuyang Wang, Weilin Yang, Zengtao Chen
Summary: This study analyzes the post-buckling behavior of porous piezoelectric nanobeams by considering surface effects. The results show that the surface effects can increase the effective elastic modulus and critical load of the nanobeams, while reducing the post-buckling configuration, path, and induced charge. Additionally, the mechanical properties of the nanobeams can be improved by optimizing the pore distribution.
Article
Computer Science, Interdisciplinary Applications
Mahmood Fakher, Shahrokh Hosseini-Hashemi
Summary: It has been found that the common nonlocal strain gradient theory has inconsistencies, but the local/nonlocal strain gradient (LNSG) theory can solve the transverse vibrations of nanobeams. By introducing a higher order beam element in finite element analysis, numerical and exact solutions for LNSG nanobeams are obtained.
ENGINEERING WITH COMPUTERS
(2022)
Article
Engineering, Civil
Masoumeh Soltani, Farzaneh Atoufi, Foudil Mohri, Rossana Dimitri, Francesco Tornabene
Summary: The lateral-torsional buckling behavior of functionally graded non-local beams with a tapered I-section was investigated using an innovative methodology. The study derived governing equations based on nonlocal elasticity theory and energy method, and used the differential quadrature method to determine buckling loads. The research findings can serve as benchmarks for further studies on nanoscale tapered thin-walled beams.
THIN-WALLED STRUCTURES
(2021)
Article
Mechanics
Mohamed-Ouejdi Belarbi, Mohammed-Sid-Ahmed Houari, Ahmed Amine Daikh, Aman Garg, Tarek Merzouki, H. D. Chalak, Hicham Hirane
Summary: An efficient nonlocal finite element model was developed to study the bending and buckling behavior of functionally graded nanobeams. The new theory provides accurate transverse shear stress distribution without the need for correction factors, showing high accuracy and convergence rate. Detailed numerical studies validated the performance and reliability of the proposed model.
COMPOSITE STRUCTURES
(2021)
Article
Chemistry, Physical
Ali Naderi, Tran Quoc-Thai, Xiaoying Zhuang, Xiaoning Jiang
Summary: For the first time, this study investigates the vibrational responses of a unimorph nanobeam with a functionally graded base and a dielectric layer that exhibits both piezoelectricity and flexoelectricity. The study applies the paradox-free local/nonlocal elasticity and utilizes Hamilton's principle to determine the formulation and boundary conditions. Additionally, the generalized differential quadrature method (GDQM) is implemented to solve complex partial differential equations. The results show that small-scale flexoelectricity dominates the electromechanical coupling, indicating the importance of studying the effect of dielectric materials in smart structures.
Article
Mechanics
Abbas Barati, Amin Hadi, Mohammad Zamani Nejad, Reza Noroozi
Summary: This article investigates the transverse vibrations of bi-directional functionally graded nanobeams subjected to a longitudinal magnetic field. The nonlocal elasticity theory and the generalized differential quadrature method are used to obtain the equations of motion and boundary conditions, and the effect of different parameters on vibration is studied.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Materials Science, Multidisciplinary
Shahin Behdad, Mahmood Fakher, Shahrokh Hosseini-Hashemi
Summary: The study demonstrates that using two-phase local/nonlocal elasticity theory is more suitable for analyzing the dynamic stability and damping vibration of Timoshenko nanobeams subjected to an axial load, compared to the fully nonlocal elasticity theory. This approach allows for studying the size-dependent vibration and stability under various boundary conditions.
MECHANICS OF MATERIALS
(2021)
Article
Mechanics
Piotr Jankowski, Krzysztof Kamil Zur, Jinseok Kim, C. W. Lim, J. N. Reddy
Summary: This study investigates the piezoelectric effect on bifurcation buckling of symmetric FGM porous nanobeam, presenting a comprehensive analysis on the impact of various factors on critical in-plane force, critical porosity, and critical voltage. The research provides a theoretical basis for analyzing and controlling the static response of smart beam-like nanostructures widely used in MEMS and NEMS devices.
COMPOSITE STRUCTURES
(2021)
Article
Automation & Control Systems
Linglong Gao, Li Teng, Minfan Fu, Haoyu Wang, Junrui Liang
Summary: This article proposes a compact self-sensing synchronized switch interface for piezoelectric energy harvesting. The interface circuit uses a modified buck-boost topology and implements time-sharing control. It works in strong discontinuous conduction mode and extracts a small amount of charge from the piezoelectric transducer for sensing, while extracting charge at a higher intensity for energy harvesting. The self-sensing mechanism is studied theoretically and validated through experiments.
IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Tarek Merzouki, Mohammed Sid Ahmed Houari, Mohamed Haboussi, Aicha Bessaim, Manickam Ganapathi
Summary: In this study, a new trigonometric two-variable shear deformation beam nonlocal strain gradient theory is proposed. The combined effects of nonlocal stress and strain gradient on the bending, buckling, and free vibration analysis of nanobeams are investigated. The proposed model shows good predictive capability and accuracy within the nonlocal context, as demonstrated through numerical examples and comparisons with other higher-order shear deformation beam theories.
ENGINEERING WITH COMPUTERS
(2022)
Article
Engineering, Multidisciplinary
Raffaele Barretta, Andrea Caporale, Raimondo Luciano, Marzia Sara Vaccaro
Summary: Nonlocal continuum theories are applied to investigate the mechanics of nanobeams under non-smooth fields. The study starts with the general formulation of elasticity in nanobeams based on the abstract form of nonlocal gradient theory. The equivalent differential problem is derived to determine the constitutive law, and the simplest constitutive interface conditions not involving spatial convolutions are established.
INTERNATIONAL JOURNAL OF ENGINEERING SCIENCE
(2023)
Article
Engineering, Mechanical
Mahmood Fakher, Shahin Behdad, Ali Naderi, Shahrokh Hosseini-Hashemi
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2020)
Article
Physics, Multidisciplinary
Shahin Behdad, Mahmood Fakher, Ali Naderi, Shahrokh Hosseini-Hashemi
Summary: The dynamics of cracked nanobeams surrounded by size-dependent Winkler-Pasternak medium were studied using two-phase local/nonlocal elasticity theory. The results showed significant changes in vibration frequencies of intact and defected nanobeams when size dependency was applied to the medium. The impact of nonlocal effects on defected nanobeams varied depending on crack characteristics. This research can provide more accurate predictions in vibration analysis of defected nanostructures embedded in two-parameter medium.
WAVES IN RANDOM AND COMPLEX MEDIA
(2021)
Article
Instruments & Instrumentation
Ali Naderi, Shahin Behdad, Mahmood Fakher
Summary: This paper studies the mechanics of nonlocal piezo-magnetic nanobeams embedded in a local/nonlocal viscoelastic medium. An exact solution and an efficient approach of generalized differential quadrature method (GDQM) are introduced. The results show that the size-dependency of the viscoelastic medium, external electric, and magnetic loads play significant roles in the vibration characteristics and should be considered based on two-phase theory.
SMART MATERIALS AND STRUCTURES
(2022)
Article
Chemistry, Physical
Ali Naderi, Tran Quoc-Thai, Xiaoying Zhuang, Xiaoning Jiang
Summary: For the first time, this study investigates the vibrational responses of a unimorph nanobeam with a functionally graded base and a dielectric layer that exhibits both piezoelectricity and flexoelectricity. The study applies the paradox-free local/nonlocal elasticity and utilizes Hamilton's principle to determine the formulation and boundary conditions. Additionally, the generalized differential quadrature method (GDQM) is implemented to solve complex partial differential equations. The results show that small-scale flexoelectricity dominates the electromechanical coupling, indicating the importance of studying the effect of dielectric materials in smart structures.
Article
Engineering, Mechanical
Ali Naderi, Shahin Behdad, Mahmood Fakher, Shahrokh Hosseini-Hashemi
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(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)
