Article
Engineering, Civil
Chaofeng Li, Xueyang Miao, Ruihuan Qiao, Qiansheng Tang
Summary: This paper presents a modeling method of bolt connections considering micro-slip characteristics based on the improved Iwan model. The study uses Chebyshev polynomials as admissible displacement functions to investigate the vibration characteristics of bolted flange cylindrical shells using Sanders' shell theory. The effects of flange geometry, bolt preload, and excitation amplitude on the natural frequency and vibration response of the shell are examined while considering nonlinear characteristics of micro-sliding motion and different tensile and compression stiffness in bolted joints.
THIN-WALLED STRUCTURES
(2021)
Article
Construction & Building Technology
Imene Harbaoui, Mohamed Amine Khadimallah, Abdelhakim Benslimane, Guoyong Jin, Omer Civalek
Summary: This paper presents a dynamic analysis of a prestressed stiffened circular cylindrical shell subjected to external distributed pressure using the dynamic stiffness method. The natural frequencies are easily processed and the dynamic stiffness matrix has been built. The vibration analysis with numerical examples shows that the proposed element has advantages in model size, computing time, accuracy, and precision compared to the finite element method.
STEEL AND COMPOSITE STRUCTURES
(2021)
Article
Mechanics
Ying Zhang, Dongyan Shi
Summary: This paper establishes a universal model of laminated composite coupled double cylindrical shell-annular-rectangular plate system (LDCARS) and solves the unknown coefficients of displacement components using the Rayleigh-Ritz method, validating the accuracy and correctness of the method. A comprehensive analysis is then conducted, analyzing the contribution of main parameters to the vibration characteristics.
COMPOSITE STRUCTURES
(2022)
Article
Engineering, Civil
Dongxu Du, Wei Sun, Hongwei Ma, Xianfei Yan, Xiaofeng Liu
Summary: This paper proposes a unified discontinuous variable-stiffness model to simulate the actual connection situation of bolts and establishes a new dynamic model to study the characteristics of rotating bolted joined cylindrical shells. The connection stiffness of bolts is determined through modal testing and particle swarm optimization algorithm. The reliability of the model is validated through experiments and comparisons, and the influences of rotating speed, connection stiffness, and number of bolts on mode shapes and natural frequencies are investigated.
THIN-WALLED STRUCTURES
(2022)
Article
Mechanics
Yu Chang, Jianguo Ding, Hui Fan
Summary: Bolted joints play a crucial role in the static and dynamic performances of mechanical systems. This study proposes an interfacial micromechanics modeling method using fractal theory to predict contact characteristics and incorporates the interaction effect caused by successive tightening of multiple bolts. Three contact models for bolted joints are examined and compared using different numerical methods. Experimental validation shows the practicality and accuracy of these models, which have their own advantages and limitations depending on the complexity of the bolted structure, computational efficiency requirements, and research focus.
Article
Polymer Science
Daniel Tobalina-Baldeon, Felix Sanz-Adan, Marian Martinez-Calvo, Carmelo Gomez, Inigo Sanz-Pena, Francisco Cavas
Summary: The use of composite materials in the automotive sector has been increasing steadily due to their superior performance compared to steel, particularly in dynamic, acoustic, and damping properties. However, challenges exist in out-of-plane mechanical properties when it comes to anchoring these materials to the vehicle's body.
Article
Forestry
Doppo Matsubara, Masaki Teranishi, Yoshiaki Wakashima
Summary: The management of axial forces in bolted joints of a wooden structure during construction is crucial, and this study focuses on the elastic interactions that affect the axial force of adjacent bolts. Experimental results suggest that increasing the bolt spacing can reduce variations in axial force, and an evaluation formula is derived to calculate fluctuations caused by elastic interactions.
JOURNAL OF WOOD SCIENCE
(2022)
Article
Engineering, Mechanical
Jie Hong, Zhefu Yang, Yongfeng Wang, Ronghui Cheng, Yanhong Ma
Summary: This paper investigates the combination resonances of bolted rotor systems with asymmetric preloads under multi-frequency excitation and proposes a new breathing model. Theoretical and experimental studies demonstrate that combination resonances could occur in practical dual rotor systems near specific frequencies.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Multidisciplinary
Wenbo Shi, Zhousuo Zhang
Summary: An accurate understanding of the elastostatic properties for flange-bolted joints is crucial in modeling the nonlinear dynamics. This study investigates the elastostatics of flange and presents a mechanical model based on linear elasticity to understand the bi-linear axial stiffness properties and the influence of bolt preloads on stiffnesses. The analysis shows that the differences in interface contact status and different tensile and compressive stiffnesses induce the bi-linear axial stiffness and coupling deformations, while bolt preloads mainly affect the tensile and bending stiffnesses.
INTERNATIONAL JOURNAL OF PRESSURE VESSELS AND PIPING
(2023)
Article
Engineering, Mechanical
Tianrui Yang, Hui Ma, Zhaoye Qin, Hong Guan, Qian Xiong
Summary: In this paper, a finite element model is established to analyze the effects of rotating-flexible shaft-disk-drum system with bolted joints. The model takes into account rotation-induced effects and is validated by literature and experiments. Several conclusions are drawn regarding the natural characteristics of the SDR system.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Tao Li, Dongjian Yang, Binbin Zhao, Qingchao Sun, Junzhou Huo, Wei Sun
Summary: This paper studies the dynamic parameter characteristics of the bolted flange joint interface and its variation patterns under external excitation, bolt distribution, and tightening torque. The results suggest that bolt preload significantly affects the stiffness variation of the joint interface.
JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
(2021)
Article
Engineering, Marine
Chunyu Zhang, Guoyong Jin, Zhihao Wang, Yao Sun
Summary: The dynamic stiffness method (DSM) is proposed to investigate the vibration characteristics of coupled conical-ribbed cylindrical-conical shell structures. The method divides the structure into components and formulates a dynamic stiffness matrix based on the relationships between displacements and forces. Experimental validation and numerical examples demonstrate the accuracy and stability of the method, providing insights into the effects of geometric parameters on dynamic behaviors.
Article
Engineering, Civil
Peng Zuo, Xianjie Shi, Renwei Ge, Jingrun Luo
Summary: A unified solution method is established for analyzing the free, steady-state, and transient vibration of composite laminated joined conical-cylindrical shells under thermal environment. The use of artificial spring technology helps handle the boundary and continuity conditions, and the proposed approach is shown to be efficient through comparison with the finite element method solution.
THIN-WALLED STRUCTURES
(2022)
Article
Acoustics
Zhibing Li, Guoyong Jin, Tiangui Ye, Tie Jun Yang, Saifeng Zhong, Linghua Tian
Summary: This paper proposes a unified vibration modeling for free and forced vibration analysis of coupled open cylindrical shell-plate structures (COSPS). The model splits the coupled structure into open cylindrical shells and rectangular plates, establishes the dynamic stiffness (DS) matrix of each substructure based on thin plate theory and thin shell theory, and assembles the global DS matrices using a strategy similar to the finite element method. The proposed model is verified through vibration analysis of different COSPS structures and experimental tests, showing reliability and effectiveness in the modeling process.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Engineering, Civil
Xuhong Qiang, Xinran Duan, Xu Jiang, Qiang Lu, Guangqing Zhou
Summary: In this study, the bolted joints between Iron-based Shape Memory Alloy (Fe-SMA) and steel plates were experimentally investigated, and the key influencing parameters were obtained. Experimental verification and design suggestions were provided, which contribute to the scientific application of Fe-SMA in the performance rehabilitation of steel structures.
ENGINEERING STRUCTURES
(2023)
Article
Mechanics
Chaofeng Li, Zilin Chen, Zengchuang Shen, Houxin She
Summary: This paper studies the vibration reduction characteristics of a flexible blade with a dovetail joint and underplatform damper. The influence of the platform mass on the blade's inherent characteristics is considered, and the underplatform is treated as a particle with mass. Two types of friction models are introduced on the blade's contact interfaces, and the normal pressure of these interfaces varies with the rotating speed of the blade. The dynamical equation for the rotating blade is established using the finite element method, and the effects of rotating speed, initial preload, and contact angle of the underplatform on the blade's vibration reduction are investigated.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2022)
Article
Engineering, Mechanical
Houxin She, Chaofeng Li, Qiansheng Tang, Bangchun Wen
Summary: The study developed a blade-disk-shaft coupling model to interpret the effects of tuned/mistuned lacing wire on coupled modal properties. Model validation showed improved accuracy over previous models. Analysis focused on the effects of varying lacing wire location and stiffness ratio on coupling behavior, introduced a mistuning severity factor, and examined the sensitivity of mode frequencies to lacing wire damage. The study provides insights for mistuning identification in the shaft-disk-blade packet system.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Materials Science, Multidisciplinary
Hao Cheng, Chao-feng Li, Yulin Jiang
Summary: A novel dynamic model based on FSDT is established to study the vibration characteristics of carbon nanotubes reinforced composite blades. The influence of various factors on the vibration is analyzed in detail.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2022)
Article
Mechanics
Xueyang Miao, Chaofeng Li, Yulin Jiang
Summary: This study presents a unified method to analyze free vibrations of dual-functional graded nanocomposite laminated cylindrical shells reinforced by carbon nanotubes under arbitrary boundary conditions, with a focus on the effects of volume fraction of CNTs, change of matrix material, the thickness of the middle layer, and geometric parameters on the natural frequency.
COMPOSITE STRUCTURES
(2021)
Article
Acoustics
Houxin She, Chaofeng Li, Qiansheng Tang, Bangchun Wen
Summary: This study investigates the eigenvalues of veering and merging phenomena in an assembly bladed disk system, as well as the interactions between disk-dominated and blade-dominated modes. Through numerical analysis using modal functions and frequency-domain methods, it is found that coupling interactions induce various phenomena, with modal frequencies at low rotational speeds significantly affected by nonlinearity.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Acoustics
Chaofeng Li, Xiaowen Liu, Qiansheng Tang, Zilin Chen
Summary: A nonlinear dynamic model of a rotating beam with dry friction support boundary conditions is developed and validated by comparing it with existing literature. The study focuses on the impact of higher-order harmonic components on the nonlinear dynamic response of the beam, as well as the effects of friction coefficient, excitation amplitude, and rotational speed on the system's amplitude-frequency response. The results demonstrate the importance of considering slip zones, contact stiffness, and contact damping in interpreting the variation of amplitude-frequency curves.
JOURNAL OF SOUND AND VIBRATION
(2021)
Article
Engineering, Mechanical
Xue-Yang Miao, Chao-Feng Li, Yu-Lin Jiang, Zi-Xuan Zhang
Summary: A unified method is developed to analyze free vibrations of the three-layer functionally graded cylindrical shell with non-uniform thickness. Chebyshev polynomials and the Rayleigh-Ritz method are used to further improve computational efficiency. The effects of spring stiffness, volume fraction indexes, configuration of shell, and change in thickness of the middle layer on the modal characteristics are also analyzed.
JOURNAL OF SANDWICH STRUCTURES & MATERIALS
(2022)
Article
Mechanics
Zilin Chen, Chaofeng Li, Zhenya Yang, Houxin She
Summary: In this paper, a contact slip mechanics model based on pressure distribution is developed to define the contact behavior between contact interfaces. The model is validated using a finite element model and the theory of load equivalence.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Acoustics
Zhenya Yang, Chaofeng Li
Summary: Based on the theory of elastic structure analysis, this paper establishes dynamic and macroslip hysteresis models for a rotating fir-tree blade considering rotational softening and centrifugal stiffening. Innovative pressure distribution model and relationship between fit clearance and contact pressure of the fir-tree tenon are proposed using elastic mechanics. The dynamic equation of the blade is solved iteratively and the effects of tenon angle, friction coefficient, rotational speed, and aerodynamic excitation on blade vibration characteristics are analyzed to provide insights for the design of tenon blades with optimal damping effect at different speeds in industrial practice.
SHOCK AND VIBRATION
(2023)
Article
Acoustics
Chaofeng Li, Zhenya Yang, Zilin Chen, Tichang Jia
Summary: A dynamic model of a tenoned rotating blade considering the pressure distribution characteristics of the contact interface is established, and the degree of freedom of the model is reduced by the double coordination free-interface modal synthesis method. The finite element model of the blade is constructed using ANSYS, and multiple contact pairs are established on the contact surface of the tenon. The results show that the double coordination free-interface modal synthesis method can effectively reduce the degree of freedom of the blade model while retaining the local contact characteristics of the interface.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Acoustics
Tichang Jia, Chaofeng Li, Shijie Pan, Yunzhao Wang
Summary: This study establishes a dynamic model of a rotating beam with a tenon structure under the thermal environment using the Assumed Mode Method. The Harmonic Linearization Method is applied to linearize the frictional force, and the relationship between friction coefficient and temperature is fitted based on experimental data. The accuracy of the proposed model is verified through comparison with finite element models and existing literature. The effects of rotational speed and temperature on the dynamic characteristics of the rotating blade are investigated by solving for natural frequencies and vibration responses. The comprehensive influence of temperature, friction, and rotational speed differs from that of a single factor.
JOURNAL OF SOUND AND VIBRATION
(2023)
Article
Mechanics
Haoyan Zhang, Chaofeng Li, Tichang Jia
Summary: This study proposes a method to investigate the coupling effect of multi-interface blades on nonlinear vibrations. The dynamics of a pre-twisted tenon jointed blade with under-platform dampers in a thermal environment is modeled, considering the combined effects of thermal effects and nonlinear loads. A friction model of the tenon and under-platform dampers contact interface is developed. The effects of natural frequency, temperature, rotational speed, and pre-twisted angle on blade vibration characteristics and nonlinear characteristics are analyzed while studying the coupling effect of multiple friction interfaces.
MECHANICS BASED DESIGN OF STRUCTURES AND MACHINES
(2023)
Article
Materials Science, Multidisciplinary
Kang Yang, Chaofeng Li, Yulin Jiang
Summary: This article presents a novel bistable symmetric laminate of pure carbon fiber composite. An analytical model based on finite element analysis (FEA) and a segmented continuous displacement function was established. Experimental results confirmed the agreement between the analytical and FEA results. The effects of various laminate lengths, widths, ratios, thicknesses, and materials were also investigated, showing that the bistable laminate has larger deformation and lower snap-through load.
MECHANICS OF ADVANCED MATERIALS AND STRUCTURES
(2023)
Article
Instruments & Instrumentation
Zhiwei Wu, Chaofeng Li, Binbin Zhu, Ying Li
Summary: This paper aims to develop a simple piezoelectric beam conveyor based on the standing wave principle and explores the effect of tooth height on the piezoelectric beam and the number of piezoelectric plates on the motion. The numerical model is established based on the Euler-Bernoulli beam theory and Lagrange equation, using the Chebyshev polynomial as the admissible displacement function, and the correctness of the numerical model calculation results is verified using ANSYS. The effect of tooth height on motion efficiency is analyzed from theory and experiment, respectively, and the effects of voltage amplitude, frequency, preload force, and the driving quantity of piezoelectric plates on the slider motion speed and driving force are discussed. The conclusion is informative for the selection of tooth and preload force.
SMART MATERIALS AND STRUCTURES
(2023)
Article
Engineering, Mechanical
Qiansheng Tang, Houxin She, Chaofeng Li, Bangchun Wen
Summary: This paper investigates the influence of non-uniform parameters of bolt joints on the frequency complexity characteristics of cylindrical shell structures. The vibration equation of the bolted joined cylindrical shell is derived and statistical analysis is conducted using Monte Carlo simulation and statistical theory. The effect of random distribution and constraint stiffness of the bolts on the frequency and mode shape is studied, and the natural frequencies are evaluated for different mistuned levels.
CHINESE JOURNAL OF MECHANICAL ENGINEERING
(2023)
Article
Acoustics
Cailiang Zhang, Zhihui Lai, Zhisheng Tu, Hanqiu Liu, Yong Chen, Ronghua Zhu
Summary: This paper proposes two single-parameter-adjusting SR models to optimize the output performance of SR systems. The effects of the proposed models on SR output under different parameters and signals are investigated through numerical simulations, and their feasibility is verified through experimental results. The research results are of great significance for guiding the design of tri-stable SR models and the application of SR-based signal processing in the context of big data.
Article
Acoustics
Shaoqiong Yang, Hao Chang, Yanhui Wang, Ming Yang, Tongshuai Sun
Summary: In this study, a suspension system based on phononic crystals is designed for vibration isolation of acoustic loads in underwater gliders. The vibration properties of the phononic crystals and the effects of physical parameters on the underwater attenuation zones are investigated. Vibration tests show that the phononic crystal suspension system has a stable vibration isolation effect in the frequency range of 120-5000 Hz.
Article
Acoustics
Xuebin Zhang, Jun Zhang, Tao Liu, Ning Hu
Summary: This study proposes a tunable metamaterial beam to isolate flexural waves. A genetic algorithm-based size optimization is used to obtain a broad low-frequency bandgap. The tunability of the beam is achieved by attaching different numbers of permanent magnets to change the mass of the resonators. Additionally, ultra-broadband flexural wave attenuation is achieved by forming a gradient metamaterial beam based on the rainbow effect. Numerical and experimental results confirm the good flexural wave attenuation ability of the proposed beam.
Article
Acoustics
Luca Rapino, Francesco Ripamonti, Samanta Dallasta, Simone Baro, Roberto Corradi
Summary: This paper presents a method for simulating tyre/road noise using equivalent monopoles, including the synthesis of monopoles through an inverse problem approach and the use of an ISO 10844 road replica for laboratory testing. The method combines acoustic finite element models and numerical simulations of vehicles, and the results are validated by comparing them with measured data.
Article
Acoustics
Xiaoyan Zhu, Tin Oberman, Francesco Aletta
Summary: This paper explores the definition of acoustical heritage and proposes a multidimensional definition based on interviews with experts and detailed analysis of the data.
Article
Acoustics
Faeez Masurkar, Saurabh Aggarwal, Zi Wen Tham, Lei Zhang, Feng Yang, Fangsen Cui
Summary: This research focuses on estimating the elastic constants of orthotropic laminates using ultrasonic guided waves and inverse machine learning models. The results show that this approach has the potential to accurately predict the elastic constants of a material and reduce computational time.
Article
Acoustics
Feng Xiao, Haiquan Liu, Jia Lu
Summary: Diagnostic methods for cardiovascular disease based on heart sound classification have been widely studied due to their noninvasiveness, low-cost, and high efficiency. However, existing research often faces challenges such as the nonstationarity and complexity of heart sound signals, leading to limited capability of neural networks to extract discriminative features. To address these issues, this study proposes a novel convolutional neural network that combines 1D convolution and 2D convolution, and introduces an attention mechanism to enhance feature extraction capability. The study also explores the advantages and disadvantages of combining deep learning features with manual features, and adopts an evolving fuzzy system for decision-making interpretability.
Article
Acoustics
Hong Xu, Zhengyao He, Qiang Shi, Yushi Wang, Bo Zhang
Summary: This paper presents the development of a directional segmented ring transmitting transducer that can radiate sound waves in any horizontal region. The study focuses on the structure of the segmented ring transducer, its radiation sound field characteristics, and the beam pattern control method based on modal synthesis. The authors propose orthogonal beam pattern functions for adjusting steering angles and establish a three-dimensional finite element model to simulate the transmitting beam patterns. Experimental measurements and tests validate the effectiveness of the proposed transducer, showcasing its ability to steer the beam patterns to different directions.
Article
Acoustics
Jirui Yang, Shefeng Yan, Di Zeng, Gang Tan
Summary: This paper proposes an improved domain adaptation framework, self-supervised learning minimax entropy, to enhance the recognition performance of underwater target recognition models. The experimental results demonstrate that applying domain adaptation methods can effectively improve the recognition accuracy of the models under various marine conditions.
Article
Acoustics
Zonghan Sun, Jie Tian, Yuhang Zheng, Xiaocheng Zhu, Zhaohui Du, Hua Ouyang
Summary: This paper analyzes the noise reduction method of installing a sinusoidal-shaped inlet duct on a cooling fan through theoretical and experimental analysis of the acoustic mode modulation. The study establishes the correlation between the free field noise and acoustic mode of the fan rotor and the unsteady forces on the rotor blade surface. The results show that the sinusoidal-shaped inlet duct achieves greater noise reduction compared to a straight duct, especially at the blade passing frequency and its first harmonic.
Article
Acoustics
Min Li, Rumei Han, Hui Xie, Ruining Zhang, Haochen Guo, Yuan Zhang, Jian Kang
Summary: This study is part of a global collaboration to translate and standardise soundscape research. A reliable questionnaire for soundscape characterisation in Mandarin Chinese was developed and validated. The study found that salient sound sources become the focus of attention for individuals in urban open spaces, and the perception is also influenced by the acoustic characteristics of the soundscape. Certain types of sound sources play a more important role in soundscape perception.
Article
Acoustics
Arezoo Talebzadeh, Dick Botteldooren, Timothy Van Renterghem, Pieter Thomas, Dominique Van de Velde, Patricia De Vriendt, Tara Vander Mynsbrugge, Yuanbo Hou, Paul Devos
Summary: This study proposes a sound selection methodology to enhance the soundscape in nursing homes and reduce BPSD by analyzing sound characteristics and recognition methods. The results highlight the sound characteristics that lead to positive responses, while also pointing out the need for further studies to understand which sounds are most suitable for people with dementia.
Article
Acoustics
Yang Yang, Yongxin Yang, Zhigang Chu
Summary: This paper introduces a grid-free compressive beamforming method compatible with arbitrary linear microphone arrays, and demonstrates the correctness and superiority of the proposed method through examples. Monte Carlo simulations are performed to reveal the effects of source coherence, source separation, noise, and number of snapshots.
Article
Acoustics
Sukru Selim Calik, Ayhan Kucukmanisa, Zeynep Hilal Kilimci
Summary: Computer-Aided Language Learning (CALL) is growing rapidly due to the importance of acquiring proficiency in multiple languages for effective communication. In the field of CALL, the detection of mispronunciations is vital for non-native speakers. This research introduces a novel framework using audio-centric transformer models to detect mispronunciations in Arabic phonemes. The results demonstrate that the UNI-SPEECH transformer model yields notable classification outcomes in Arabic phoneme mispronunciation detection. The comprehensive comparison of these transformer models provides valuable insights and guidance for future investigations in this domain.
Article
Acoustics
Yi-Yang Ni, Fei-Yun Wu, Hui-Zhong Yang, Kunde Yang
Summary: This paper proposes an improved method for compressive sensing by introducing a self training dictionary scheme and a CS reconstruction method based on A*OLS, which enhances the sparse representation performance of propeller signals.
