Article
Mechanics
Fangrui Lv, Yanqin Shangguan, Donglin Zou, Aimin Ji
Summary: This study proposes a transient mixed-lubrication model considering turbulence to investigate the dynamic characteristics of mixed-lubricated bearings. The effects of turbulence, surface roughness, and impact load direction on transient lubrication are analyzed based on a derived transient Reynolds equation and the journal's dynamic equation.
Article
Engineering, Marine
Yandong Gu, Jinwu Cheng, Hao Sun, Ao Liang, Li Cheng
Summary: This study investigates the static characteristics of water-lubricated hydrodynamic journal bearings under three-dimensional slip velocity boundary conditions. The CFD method is verified under the non-slip boundary condition and a three-dimensional slip velocity equation based on the Navier slip velocity boundary condition is proposed. The results show that with an increase in slip length, the load capacity and friction power decrease, while an increase in attitude angle leads to an increase in load capacity and friction power.
JOURNAL OF MARINE SCIENCE AND ENGINEERING
(2022)
Article
Engineering, Mechanical
Satoru Maegawa, Xiaoxu Liu, Fumihiro Itoigawa
Summary: This study discusses the occurrence conditions of a stick-slip model based on a 2DOF system, where a commonly used 1DOF system model is attached to an elastic foundation. The study investigates the effects of the mass, stiffness, and damping coefficient of the elastic foundation on the occurrence and non-occurrence of stick-slip.
Article
Engineering, Mechanical
Wei Chen, Jiliang Mo, Huajiang Ouyang, Zaiyu Xiang, Jing Zhao
Summary: A bistable energy harvester in a friction system is modeled and numerically investigated. The study reveals that the vibration pattern of the energy harvester can be very complex under the influence of loading force and belt velocity, exhibiting various behaviors such as quasi-periodic, chaotic, and periodic oscillations.
NONLINEAR DYNAMICS
(2023)
Article
Mathematics, Applied
Xuechuan Wang, Xinjun Long, Xiaokui Yue, Honghua Dai, Satya N. Atluri
Summary: This paper presents a new approach to studying the nonlinear dynamical behaviors of a belt-driven two-coupled friction oscillator. By deriving dimensionless parameters and conducting numerical simulations, the relationships between these parameters and the system's steady state responses are revealed. Additionally, a new mapping tool called the sticking phase plot is developed to record the transition process of stick-slip motion and intuitively demonstrate bifurcation occurrences and dynamical response transformations. The bifurcation diagrams of the system are obtained, showcasing extraordinary bifurcation phenomena and new nonlinear phenomena such as chaos and sliding bifurcations caused by Border-Collision Bifurcation and Sliding Bifurcations. The importance of the Fixed-Point bifurcation's local and global changes is also observed. The authors employ the LVIM method for accurate and efficient integration of non-smooth systems in numerical simulations.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2022)
Article
Acoustics
Hugo Heidy Miyasato, Vinicius Gabriel Segala Simionatto, Milton Dias Junior
Summary: Mass-on-belt models are important for studying stick-slip behavior. The inclusion of Zener viscoelastic support enhances stability, and nonlinear results show that responses can be represented by three-dimensional limit cycles. The system also exhibits bistability and interactions between limit cycles and fixed points.
JOURNAL OF SOUND AND VIBRATION
(2022)
Article
Mechanics
Yegao Qu, Fangtao Xie, Heng Su, Guang Meng
Summary: This paper develops a numerical model for predicting the nonlinear structural and acoustic responses of a composite laminated plate induced by stick-slip motions. The model incorporates a higher-order shear deformation theory and a macro-slip friction model. It finds that periodic distortions in sound pressure waves are mainly due to stick-to-slip transitions. The effects of preload, friction coefficient, and boundary stiffness on the responses are examined.
COMPOSITE STRUCTURES
(2021)
Article
Thermodynamics
Huai Zhao, Huajiang Ouyang
Summary: Despite significant progress in triboelectric energy harvesting, most research has focused on experiments and/or manufacturing, lacking in-depth theoretical studies on the underlying vibration and its effects on power yield. This paper presents a novel theoretical study on a capsule-structured triboelectric energy harvester, investigating the influences of various factors on its performance and demonstrating the potential for innovative designs and fabrication guidelines.
Article
Engineering, Mechanical
Chang -Qing Li, Xiao-Ping Zhou
Summary: This study investigates the mechanism of stick-slip instability of faults using 3D reconstruction technology and discrete element method. The findings are significant for understanding the seismogenic mechanism.
TRIBOLOGY INTERNATIONAL
(2022)
Article
Mechanics
Alessandro Cabboi, Luca Marino, Alice Cicirello
Summary: This study assesses the reliability of the Amontons-Coulomb law in predicting stick-slip phenomena, and analyzes the cyclic dynamic responses using two friction laws. Through sensitivity analysis, the most meaningful model parameters are identified, and the reliable parameter space for predicting stick-slip response is determined through optimization.
EUROPEAN JOURNAL OF MECHANICS A-SOLIDS
(2022)
Article
Geosciences, Multidisciplinary
John D. Bedford, Daniel R. Faulkner
Summary: The study found that quartz gouge exhibits unstable stick-slip behavior under high σn conditions, while slow-slip is more prevalent under low σn conditions. Localization and instability are mainly promoted by high effective normal stress and small grain size.
GEOPHYSICAL RESEARCH LETTERS
(2021)
Article
Engineering, Marine
Chang-Gang Lin, Ming-Song Zou, Hai-Cheng Zhang, Li-Bo Qi, Shu-Xiao Liu
Summary: The study established a mechanism for friction-induced vibration and noise in water-lubricated stern bearings, finding that changes in various parameters can significantly affect the stability and nonlinear response of the system, providing important guidance for low noise design.
INTERNATIONAL JOURNAL OF NAVAL ARCHITECTURE AND OCEAN ENGINEERING
(2021)
Article
Engineering, Mechanical
Liming Zhao, Penghui Cao
Summary: The computational study on the atomic-scale stick-slip friction of monolayer graphene on a copper substrate reveals a strong temperature dependence of friction force and friction mode. The role of Moire superlattices in affecting friction force is significant, especially at different temperatures, leading to changes in friction behavior and transition from athermal to thermally activated friction modes.
EXTREME MECHANICS LETTERS
(2021)
Article
Acoustics
Dali Lyu, Qichang Zhang, Kewei Lyu, Jiaxing Liu, Yulong Li
Summary: This paper investigates the vertical dynamic characteristics of a simple suspension system with dry friction through analytical and numerical methods, finding that reducing wedge angle, friction coefficient, adjusting side frame angle, or decreasing spring stiffness can effectively reduce the likelihood of sticking events.
SHOCK AND VIBRATION
(2021)
Article
Engineering, Marine
Qianwen Huang, Zhihao Xie, Huaiguang Liu
Summary: This paper proposes an active control method based on a state observer to suppress the stick-slip behavior of the marine propeller shaft, aiming to improve the efficiency and reliability of the power system. The rotational speed of each segment of the shaft is tracked using state feedback and internal model principle. The behavior of the state observer is analyzed through a comparison of actual and observed values, and the robustness of the control system is investigated by comparing overshoot rate and adjustment time with different control parameters. The proposed frictional model is validated by comparing the observed velocity with previous reference, and active control of friction-induced vibration of the marine propeller shaft is achieved through adjustment of control parameters.
Article
Computer Science, Interdisciplinary Applications
S. Z. Feng, Y. C. Guo, Grzegorz Krolczyk, Xu Han, Atilla Incecik, Zhixiong Li
Summary: A computational approach is developed for multi-physics modelling of IGBT module, considering the coupling effect between electrical, thermal, and mechanical fields. The approach utilizes tetrahedral elements to construct an efficient IGBT model using the finite element method. The results demonstrate that the proposed approach achieves higher accuracy, convergence, and computing efficiency compared to popular methods, providing an efficient tool for the IGBT multi-physics coupling problem.
ADVANCES IN ENGINEERING SOFTWARE
(2023)
Article
Mechanics
Shiwei Liu, Gaoliang Peng, Zhixiong Li, Weihua Li, Kang Jin
Summary: This paper investigates the application potential of origami metamaterials in advanced deployable mechanisms, intelligent robots, and energy absorption devices. It embeds flexible joints with metamaterial properties into the origami metamaterial structure, enabling simultaneous geometric nonlinearity and joint stiffness nonlinearity. The nonlinear stiffness characteristics of this composite metamaterial are examined in detail.
COMPOSITE STRUCTURES
(2023)
Article
Engineering, Electrical & Electronic
Xiaoqiang Guo, Xinhua Liu, Xu Zhang, Grzegorz M. Krolczyk, Paolo Gardoni, Zhixiong Li
Summary: The powerful belt conveyor is crucial for coal mining transportation, and its stable operation is essential for efficiency. Machine vision-based damage detection systems are widely studied and deployed, but capturing high-quality images in the harsh underground coal seam environment is difficult. To solve this issue, an image denoising and enhancement approach based on invertible neural network (INN) is proposed. The proposed model, called denoising INN (DeINN), demonstrates excellent image denoising ability and outperforms existing methods.
IEEE SENSORS JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Dezhi Jiang, Haoxian Yu, Zhihan Wang, Adam Glowacz, Grzegorz Krolczyk, Zhixiong Li
Summary: In order to reduce carbon emissions from marine engines, IMO has established EEDI and EEXI. Currently, the focus is on optimizing the heat transfer performance of exhaust gas boilers on new ships to reduce EEDI, but there is limited research on the EEXI index of existing ships. This study investigates the influence of engine exhaust temperature and flow rate on boiler heat transfer coefficients and optimizes it to achieve the required EEXI value.
Article
Engineering, Multidisciplinary
Xiaoqiang Guo, Xinhua Liu, Paolo Gardoni, Adam Glowacz, Grzegorz Krolczyk, Atilla Incecik, Zhixiong Li
Summary: A novel conveyor belt damage detection method based on CenterNet is proposed in this paper, which utilizes a fusion of feature-wise and response-wise knowledge distillation to balance performance and network size. The Fused Channel-Spatial Attention is introduced to compress the latent feature maps efficiently, and Kullback-Leibler divergence is used to minimize the distribution distance between student and teacher networks. Experimental results show that the proposed lightweight object detection model achieves 92.53% mAP and 65.8 FPS. The proposed belt damage detection system demonstrates efficient and accurate detection of conveyor belt damages, indicating its high potential for deployment on end devices.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Computer Science, Artificial Intelligence
Lili Dai, Xu Zhang, Paolo Gardoni, He Lu, Xinhua Liu, Grzegorz Krolczyk, Zhixiong Li
Summary: To reduce safety accidents during coal mining, this paper proposes a large foreign object detection method based on machine vision. An adaptive weighted multi-scale Retinex (MSR) image enhancement algorithm is proposed to improve the image quality of the belt conveyor line. An improved multi-scale template matching algorithm is designed to screen and identify large foreign objects mixed in coals. The multi-layer perceptron (MLP) network optimized by the Gray Wolf algorithm is introduced for identification. Experimental results show that the identification accuracy reaches 98.8% for the large foreign objects. Furthermore, industrial field test is carried out in the Gaoyang coal mine, and the test results demonstrate that the identification accuracy of the proposed method is more than 95%. Hence, the proposed method meets the industrial detection requirements and can be used in practices for detecting large foreign objects.
COMPLEX & INTELLIGENT SYSTEMS
(2023)
Article
Engineering, Electrical & Electronic
Yuansheng Cheng, Zhixiong Li, Grzegorz M. Krolczyk, Chunsheng Yang, Ruqiang Yan
Summary: Vibration measurement is crucial for monitoring and controlling vibrations. Noncontact vibration measurement is more practical than contact methods, but noncontact methods often require a high standard of the light field environment. To solve this problem, a new binocular vision method is proposed, which allows noncontact vibration measurement in different light fields. This method first recognizes multitarget objects in the same image using a YOLOv5 model, generating bounding boxes. A depth image is generated through binocular vision and kept synchronized with the target image. An optimal depth value decision algorithm is developed to determine the 3-D real-time coordinates of each object based on the bounding box and its corresponding depth image. As a result, vibrations of multitarget objects can be measured simultaneously. Experimental tests show accurate results and the ability of the proposed noncontact method to detect very low-frequency vibrations.
IEEE SENSORS JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Shizhe Feng, Qingjian Sun, Yang Wu, Xu Han, Zhixiong Li, Miguel Angel Sotelo
Summary: A thermal-structural-electromagnetic coupling model is proposed for the stochastic analysis of active phased array antenna performance. The model considers random material parameters and uses stochastic perturbation technique to analyze temperature distribution, thermal deformation, and electromagnetic performance. The results show that the model provides accurate stochastic multiphysics information and reduces computational cost compared to the Monte Carlo method.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Civil
Hai Wang, Le Tao, Yingfeng Cai, Long Chen, Yicheng Li, Miguel Angel Sotelo, Zhixiong Li
Summary: In this paper, a single-stage anchor-free 3-D object detector algorithm called CenterPoint-SE is proposed, which enhances the spatial perception ability of anchor-free detection networks based on CenterPoints. An efficient 3-D backbone network is constructed to extract fine-grained spatial geometric features, and a powerful spatial semantic feature fusion module called EF-Fusion is designed. Various improvements, including a lightweight IoU prediction branch and a foreground point segmentation auxiliary training branch, are added to enhance the algorithm's performance.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2023)
Article
Engineering, Industrial
Mengmeng Wang, Atilla Incecik, Shizhe Feng, M. K. Gupta, Grzegorz Krolczyk, Z. Li
Summary: A new digital twin (DT) framework with optimal sensor placement (OSP) is proposed, which accurately calculates the modal responses and identifies the damage ratios of offshore jacket platforms. The framework consists of an OSP model and a damage identification model. The OSP model optimizes the sensor number/location using the multi-objective Lichtenberg algorithm (MOLA) to balance the sensor cost and modal calculation accuracy. The damage identification model uses the Markov Chain Monte Carlo (MCMC)-Bayesian method to calculate the structural damage ratios based on modal information obtained from sensory measurements, considering the uncertainties of structural parameters. The method is validated using an offshore jacket platform, demonstrating efficient identification of structural damage location and severity.
RELIABILITY ENGINEERING & SYSTEM SAFETY
(2023)
Article
Engineering, Multidisciplinary
Xinhua Liu, Peng Qi, Patrick Siarry, Dezheng Hua, Zhenjun Ma, Xiaoqiang Guo, Orest Kochan, Z. Li
Summary: This paper proposes an improved multiscale neural network method for face recognition in underground coal mining to address the issues of overstaffing and incomplete information. Experimental results show that the proposed method can accurately recognize miners in harsh environments.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Acoustics
Lai Peng, Dezheng Hua, Xinhua Liu, Darius Andriukaitis, Grzegorz Krolczyk, Zhixiong Li
Summary: An active fluid-film bearing lubricated with magnetorheological fluid (MRF) is proposed to address the problems of insufficient load capacity and rotor vibration. The study designs the geometry of the MRF fluid-film bearing, analyzes its intelligent lubrication mechanism, and verifies the method's validity through numerical simulation. The simulation results show that the MRF bearing has the ability to suppress rotor vibration and the IGWO-PID controller has better response characteristics than other algorithms.
JOURNAL OF LOW FREQUENCY NOISE VIBRATION AND ACTIVE CONTROL
(2023)
Article
Computer Science, Artificial Intelligence
Kuosheng Jiang, Chengsong Zhang, Baoliang Wei, Zhixiong Li, Orest Kochan
Summary: The operating conditions of RV reducer are complex and the fault signal sample is small. An improved DNCNN denoising algorithm is proposed to realize the failure mode recognition of RV reducer, and experimental analysis shows its effectiveness.
EXPERT SYSTEMS WITH APPLICATIONS
(2024)
Article
Computer Science, Information Systems
Xiaogang Li, Wei Rao, Dahui Lu, Jianhua Guo, Tianwen Guo, Darius Andriukaitis, Zhixiong Li
Summary: An automated guided vehicle obstacle avoidance system based on the grid method and deep learning algorithm is proposed. It effectively detects and avoids obstacles in a complex and dynamic environment, improving the transportation efficiency and reducing the average execution time of tasks in a simulated tobacco production workshop.
Article
Computer Science, Artificial Intelligence
Baiyi Wang, Zipeng Zhang, Patrick Siarry, Xinhua Liu, Grzegorz Krolczyk, Dezheng Hua, Frantisek Brumercik, Z. Li
Summary: The African vultures optimization algorithm (AVOA) has some shortcomings in solving complex problems. To address these issues, a nonlinear African vulture optimization algorithm (HWEAVOA) is proposed, which outperforms other algorithms in terms of convergence speed, optimization ability, and solution stability, according to experimental results.
EXPERT SYSTEMS WITH APPLICATIONS
(2024)
Article
Engineering, Marine
Alba Ricondo, Laura Cagigal, Beatriz Perez-Diaz, Fernando J. Mendez
Summary: This research presents a site-specific metamodel based on the SWASH numerical model simulations, which can predict coastal hydrodynamic variables in a fast and efficient manner. The metamodel uses downscaled and dimensionality reduced synthetic database to accurately reproduce wave setup, wave heights associated with different frequency bands, and wave runup. This method has great potential in coastal risk assessments, early warning systems, and climate change projections.
Article
Engineering, Marine
Xiao Yu, Wangjun Ren, Bukui Zhou, Li Chen, Xiangyun Xu, Genmao Ren
Summary: This study investigated and compared the compression responses and energy absorption capacities of coral sand and silica sand at a strain rate of approximately 1000 s-1. The results showed that coral sand had significantly higher energy absorption capacity than silica sand due to its higher compressibility. The study findings suggest that using poorly graded coral sand can improve its energy absorption capacity.
Article
Engineering, Marine
Jingxi Zhang, Junmin Mou, Linying Chen, Pengfei Chen, Mengxia Li
Summary: This paper proposes a cooperative control scheme for ship formation tracking based on Model Predictive Control. A predictive observer is designed to estimate the current motion states of the leader ship using delayed motion information. Comparative simulations demonstrate the effectiveness and robustness of the proposed controller.
Article
Engineering, Marine
Yu Yao, Danni Zhong, Qijia Shi, Ji Wu, Jiangxia Li
Summary: This study proposes a 2DH numerical model based on Boussinesq equations to investigate the impact of dredging reef-flat sand on wave characteristics and wave-driven current. The model is verified through wave flume experiments and wave basin experiments, and the influences of incident wave conditions and pit morphological features on wave characteristics are examined.
Article
Engineering, Marine
Jayanta Shounda, Krishnendu Barman, Koustuv Debnath
Summary: This study investigates the double-average turbulence characteristics of combined wave-current flow over a rough bed with different spacing arrangements. The results show that a spacing ratio of p/r=4 offers the highest resistance to the flow, and the double-average Reynolds stress decreases throughout the flow depth. The advection of momentum-flux of normal stress shows an increase at the outer layer and a decrease near the bed region after wave imposition. Maximum turbulence kinetic energy production and diffusion occur at different layers. The turbulence structure is strongly anisotropic at the bottom region and near the outer layer, with a decrease in anisotropy observed with an increase in roughness spacing.
Article
Engineering, Marine
Meng Zhang, Lianghui Sun, Yaoguo Xie
Summary: The research proposes a method for online identification of wave bending and torsional moment in hull structures. For structures without large openings, the method optimizes sensor positions and establishes a mathematical model to improve accuracy. For structures with large openings, a joint dual-section monitoring method is proposed to simultaneously identify bending and torsional moments in multiple key cross sections.
Article
Engineering, Marine
Longming Chen, Shutao Li, Yeqing Chen, Dong Guo, Wanli Wei, Qiushi Yan
Summary: This study investigated the dynamic response characteristics and damage modes of pile wharves subjected to underwater explosions. The results showed that the main damaged components of the pile wharf were the piles, and inclined piles had a higher probability of moderate or more significant damage compared to vertical piles. The study also suggested that replacing inclined piles with alternative optimized structures benefits the blast resistance of pile wharves.
Article
Engineering, Marine
I. -C Kim, G. Ducrozet, V. Leroy, F. Bonnefoy, Y. Perignon, S. Bourguignon
Summary: Previous research focused on the accuracy and efficiency of short-term wave fields in specific prediction zones, while we developed algorithms for continuous wave prediction based on the practical prediction zone and discussed important time factors and strategies to reduce computational costs.
Article
Engineering, Marine
Hang Xie, Xianglin Dai, Fang Liu, Xinyu Liu
Summary: This study investigates the load characteristics of a three-dimensional stern model with pitch angle through a drop test, and reveals complex characteristics of pressure distribution near the stern shaft. The study also shows that the vibration characteristics of the load are influenced by the drop height and pitch angle, with the drop height having a greater effect on the high-frequency components.
Article
Engineering, Marine
Hangyuan Zhang, Wanli Yang, Dewen Liu, Xiaokun Geng, Wangyu Dai, Yuzhi Zhang
Summary: The deep-water bridge is more vulnerable to earthquake damage than the bridge standing in air. The larger blocking ratio has a significant impact on the added mass coefficient, which requires further comprehensive study. The generation mechanism of block effect is analyzed using numerical simulation software ANSYS Fluent. The results show that the recirculation zone with focus reduces the pressure on the back surface of the cylinder, resulting in the peak value of in-line force not occurring synchronously with the peak value of acceleration. The change in position and intensity of the recirculation zone with focus, as well as the change in water flow around the cylinder surface, are identified as the generation mechanism of the block effect, which has a 10% influence on the hydrodynamic force. The changing rule of the added mass coefficient with blocking ratio is discussed in detail, and a modification approach to the current added mass coefficient calculation method is suggested. Physical experiments are conducted to validate the modification approach, and the results show that it is accurate and can be used in further study and real practice.
Article
Engineering, Marine
Golnesa Karimi-Zindashti, Ozgur Kurc
Summary: This study examines the performance of an in-house code utilizing a deterministic vortex method on the rotation of circular and square cylinders. The results show that rotational motion reduces drag forces, suppresses fluctuating forces, and increases lift forces. The code accurately predicts vortex shedding suppression and identifies the emergence of near-field wakes in the flow over rotating square cylinders.
Article
Engineering, Marine
George Dafermos, George Zaraphonitis
Summary: The survivability of damaged ships is of great importance and the regulatory framework is constantly updated. The introduction of the probabilistic damage stability framework has rationalized the assessment procedure. Flooding simulation tools can be used to investigate the dynamic response of damaged ships.
Article
Engineering, Marine
Xuyue Chen, Xu Du, Chengkai Weng, Jin Yang, Deli Gao, Dongyu Su, Gan Wang
Summary: This paper proposes a real-time drilling parameters optimization method for offshore large-scale cluster extended reach drilling based on intelligent optimization algorithm and machine learning. By establishing a ROP model with long short-term memory neurons, and combining genetic algorithm, differential evolution algorithm, and particle swarm algorithm, the method achieves real-time optimization of drilling parameters and significantly improves the ROP.
Article
Engineering, Marine
Sung-Jae Kim, Chungkuk Jin, MooHyun Kim
Summary: This study investigates the dynamic behavior of a moored submerged floating tunnel (SFT) under tsunami-like waves through numerical simulations and sensitivity tests. The results show that design parameters significantly affect the dynamics of the SFT system and mooring tensions, with shorter-duration and higher-elevation tsunamis having a greater impact.
Article
Engineering, Marine
G. Clarindo, C. Guedes Soares
Summary: Environmental contours are constructed using the Inverse-First Order Reliability Method based on return periods. The paper proposes the use of the Burr distribution to model the marginal distribution of long-term significant wave heights. The newly implemented scheme results in different environmental contours compared to the reference approach.