Article
Engineering, Marine
Xinyang Li, Hao Wen, Jian Fu, Xu Zhang, Hexiong Zhou, Baoheng Yao, Lian Lian, Dequan Yu, Lifeng Mao
Summary: This research introduces a new dynamic model for underwater vehicles, taking into account variable mass and center of gravity. The variation of center of gravity and moment of inertia depends on the convolution of the mass changing rate function and trajectory function. The research highlights the significant impact of center of gravity variation on the maneuverability of underwater vehicles, compared to fixed center of gravity models. It also provides a theoretical basis for the design of variable mass underwater vehicles used in floating mining craft and underwater dredging craft.
Article
Engineering, Mechanical
Junyi Zou, Sijing Guo, Xuexun Guo, Lin Xu, Yongjia Wu, Yu Pan
Summary: This study investigates an innovative hydraulic integrated interconnected regenerative suspension system, which can harvest suspension vibration energy and enhance vehicle handling performance simultaneously. The mode-decoupling problem of the system is studied, a hydraulic model is built and numerical experiments are conducted to demonstrate the system's capability in mode decoupling and its impact on vehicle dynamics and energy harvesting performance.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Bonan Qin, Yuzhe Chen, Zhaoheng Chen, Lei Zuo
Summary: A novel energy-harvesting hydraulically interconnected suspension system, EH-HIS, is proposed in this study to enhance vehicle comfort and handling performance, successfully validated through modeling, building, and testing for its superior energy harvesting and damping characteristics. Experimental results demonstrate that EH-HIS can achieve good power collection at different excitation frequencies and amplitudes, with significantly improved performance compared to traditional suspension systems on rough terrains.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Civil
Lianhua An, Xianfeng Yang, Jia Hu
Summary: This research proposes a model to simulate the system dynamics of mixed traffic flow consisting of Connected and Automated Vehicles (CAVs) and Human-driven Vehicles (HVs). It quantifies the real-time impact of CAVs' speed change on the overall traffic state. The model takes into account the impedance of CAVs' speed reduction on traffic flow and validates its effectiveness through a microscopic simulation evaluation.
IEEE TRANSACTIONS ON INTELLIGENT TRANSPORTATION SYSTEMS
(2022)
Article
Mathematics, Applied
Melike Sirlanci, Matthew E. E. Levine, Cecilia C. Low C. Wang, David J. J. Albers, Andrew M. M. Stuart
Summary: Forecasting blood glucose (BG) levels with routinely collected data is useful for glycemic management. However, the sparsity of collected data creates issues for accurate forecasts. We develop a linear stochastic model to approximate the nonlinear dynamics of BG regulation, which can be specialized to different diabetes and ICU settings. The model includes deterministic terms for glucose removal and the effect of nutrition and insulin, as well as a stochastic term for BG oscillations. Personalized models are obtained through patient-specific parameter estimation. The forecasts provide mean and variation values for glycemic control.
Article
Mathematics
Kahsay Godifey Wubneh, Fitsum Mulaw Desta, Hafte Amsalu Kahsay
Summary: The study presents a mathematical model to analyze the dynamics of chewing Khat, focusing on the spread and stability of Khat chewers among different groups. Findings show a close relationship between the conversion rate and stability, highlighting the importance of understanding the dynamics of Khat chewing for public health interventions.
JOURNAL OF MATHEMATICS
(2021)
Article
Engineering, Aerospace
Luofeng Wang, Renliang Chen
Summary: This paper presents a new mathematical model for helicopters with flexible fuselages, which connects the research areas of flight dynamics and structural dynamics. The model is suited for aeroservoelastic analysis and is particularly suited for heavy lift helicopters.
Article
Multidisciplinary Sciences
Sean M. Gross, Farnaz Mohammadi, Crystal Sanchez-Aguila, Paulina J. Zhan, Tiera A. Liby, Mark A. Dane, Aaron S. Meyer, Laura M. Heiser
Summary: In this study, the authors use genetically engineered breast cancer cell lines and computational models to analyze the effects of drugs on specific cell cycle phases and identify effective combination treatments.
NATURE COMMUNICATIONS
(2023)
Article
Computer Science, Information Systems
Xiaotong Xu, Yutao Luo
Summary: This paper analyzes the potential collision between sleeve and dog gear in a clutchless automated mechanical transmission (AMT) and establishes dynamic models to simulate the gear-shifting process. The simulation results demonstrate that the established model accurately reflects the dynamic changes of components in the gear shifting system.
Article
Mathematics, Applied
Yunfeng Liu, Feng Jiao, Linchao Hu
Summary: In this study, the efficiency of releasing Wolbachia-infected mosquitoes to reduce the wild mosquito population size and control mosquito-borne diseases was assessed using a coupled system of differential equations. The effects of diffusion coefficient, advection constant, and release rate of infected male mosquitoes on the suppression effectiveness were analyzed. A lower release proportion threshold in homogeneous environments was found, suggesting a potential failure of mosquito suppression when the amount of infected male mosquitoes released is derived in a homogeneous environment.
JOURNAL OF MATHEMATICAL ANALYSIS AND APPLICATIONS
(2022)
Article
Computer Science, Artificial Intelligence
Akhil Bonagiri, Dipayan Biswas, Srinivasa Chakravarthy
Summary: The development of nonlinear dynamical electronic devices and circuits has made it possible to implement energy-efficient hardware realizations of neurobiological systems. Central pattern generator (CPG) is a neural system that controls rhythmic motor behaviors in animals. A compact and energy-efficient hardware platform for implementing neuromorphic CPGs would greatly benefit bio-inspired robotics. In this study, we demonstrate that four capacitively coupled VO2 memristor-based oscillators can produce spatiotemporal patterns corresponding to quadruped gaits and show similarities to conductance-based neuron models.
IEEE TRANSACTIONS ON NEURAL NETWORKS AND LEARNING SYSTEMS
(2023)
Article
Chemistry, Multidisciplinary
Linmin Li, Guolai Wei, Zuchao Zhu, Baokuan Li
Summary: Slag droplet entrainment is a common issue in steel refining processes, but it is difficult to simulate due to the complex nature of the multiphase flow system. In this study, a bidirectional VOF-LPT transformation algorithm was developed to simulate the entrainment process. The algorithm successfully captured the interface using the VOF approach and tracked tiny droplets using the LPT method, providing accurate results. The solver was validated and applied to investigate the mechanisms of slag droplet formation and entrainment.
Article
Mathematics
Xiaopeng Li, Fanjie Li, Dongyang Shang
Summary: This paper establishes a vehicle model with ISD suspension system to study its dynamic responses and vibration reduction performance under different road excitations. It is found that the ISD suspension system has the best comprehensive vibration reduction performance at the optimal vehicle speed, making it more suitable for complex road conditions than single road excitation.
Article
Mathematics, Applied
Irina Bashkirtseva, Anna Chukhareva, Lev Ryashko
Summary: This study examines the effects of treatment on tumor-immune dynamics using a conceptual two-dimensional model. The research finds that increasing chemotherapy intensity can lead to a complication of tumor-immune interaction with multiple tumor states potentially coexisting. The results of the study contribute to evaluating the efficiency of treatment programs combining chemotherapy and radiotherapy.
MATHEMATICAL METHODS IN THE APPLIED SCIENCES
(2022)
Article
Engineering, Electrical & Electronic
Fangzhou Xia, Hongkun Chen, Mohammad Shahidehpour, Wei Gan, Mingyu Yan, Lei Chen
Summary: A distributed planning method for EV dynamic wireless charging system (DWCS) is proposed in this paper to maximize the economic effects of wireless charging while meeting EV charging demands. The method combines traffic network and power distribution network constraints, and the effectiveness is verified through case studies.
IEEE TRANSACTIONS ON SMART GRID
(2021)
Article
Thermodynamics
Huwei Dai, Junhong Zhang, Yanyan Ren, Nuohao Liu, Jiewei Lin
Summary: By introducing different types of cooling holes to reduce the thermal load of thermal barrier coatings in the combustor, it is possible to increase the peak gas temperature and reduce NOx emissions. Decreasing the number of cooling holes has minimal impact on the peak working temperature of thermal barrier coatings, but can lower peak gas temperatures and NOx emissions. Cooling effectiveness is highest for console holes, followed by fan-shaped holes and conical holes.
APPLIED THERMAL ENGINEERING
(2021)
Article
Engineering, Mechanical
Junhong Zhang, Xin Lu, Jiewei Lin, Liang Ma, Huwei Dai
Summary: This paper develops a dynamic model for a 0-2-1 rotor system with rubbing fault between blade and abradable coated casings. Experimentation on vibration characteristics with abradable coatings show that rotor vibration focuses on fundamental and multiple fundamental frequencies due to blade-casing rubbing. Multiple fundamental frequencies, especially 2x and 3x, are greatly affected by rotating speed, while fractional harmonic frequencies are strongly influenced by initial clearance. Rotating speed and initial clearance also affect the amplitude and distribution of rub force.
PROCEEDINGS OF THE INSTITUTION OF MECHANICAL ENGINEERS PART C-JOURNAL OF MECHANICAL ENGINEERING SCIENCE
(2021)
Article
Engineering, Mechanical
Kainan Wang, Thomas Godfroid, Damien Robert, Andre Preumont
Summary: This paper discusses the design and manufacturing of a thin polymer spherical adaptive reflector controlled by 25 independent electrodes. Experimental influence functions of control electrodes were determined, showing an improvement in manufacturing process and the ability to approximate optical modes with reasonable voltages. The study confirms that the active material can be modeled by a quadratic model and achieve excellent properties with proper annealing.
Article
Energy & Fuels
Teng Ma, Fengrong Bi, Xu Wang, Congfeng Tian, Jiewei Lin, Jie Wang, Gejun Pang
Summary: This study proposes a semi-active vehicle suspension using a magnetorheological fluid damper, with an optimized fuzzy skyhook controller for vibration control. By optimizing with the grey wolf algorithm, the control method can reduce the amplitude of vertical acceleration, suspension deflection, and tire dynamic load simultaneously.
Article
Engineering, Mechanical
Nuohao Liu, Huwei Dai, Lianyong Xu, Zhengxin Tang, Chenyang Li, Junhong Zhang, Jiewei Lin
Summary: The crack growth behavior of Hastelloy X under creep-fatigue interaction at high temperature was investigated using a nonlinear creep-fatigue interaction damage model considering multiaxial stress. The study found that an increase in hold time, crack depth ratio, and load level enhances creep damage and accelerates crack growth rate. The independent damage model quantified the contributions of creep, fatigue, and their interaction, with creep damage dominating as hold time increased, and the interaction damage ratio decreasing with increasing crack depth ratio and load level.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2021)
Article
Chemistry, Multidisciplinary
Peng Guo, Jinlu Li, Zefeng Lin, Jiewei Lin
Summary: This study focused on the effect of driveline bushing on ride vibration under shock excitation and aimed to improve ride quality through optimizing bushing parameters. The optimized bushings significantly reduced vibration at the driver and rear passenger seats by approximately 50% in the lateral direction, leading to a considerable improvement in ride comfort.
APPLIED SCIENCES-BASEL
(2021)
Article
Materials Science, Multidisciplinary
Xi Fu, Chao Ma, Jiewei Lin, Junhong Zhang
Summary: The study focuses on the fatigue life of axial compressor blades by developing a fatigue model including torque and conducting numerical simulations. It was found that torsional shear stress affects fatigue life prediction. Additionally, there is an acceleration of damage accumulation in the last 25% of the loading cycle, potentially leading to blade fracture.
Article
Chemistry, Multidisciplinary
Bin Wu, Reza Hedayati, Zhehua Li, Mahsa Aghajanpour, Guichang Zhang, Junhong Zhang, Jiewei Lin
Summary: This study used an SPH mallard bird model to simulate bird impact to rotary aero-engine fan blades and investigated the effects of various impact and bearing parameters. The results showed that impact location and bird orientation significantly influence the bird strike outcomes, with bird impact to blade roots being the most dangerous scenario.
APPLIED SCIENCES-BASEL
(2022)
Article
Engineering, Mechanical
Carl Johan G. Nielsen, Dalong Tian, Kainan Wang, Andre Preumont
Summary: The paper examines the shape control of a spherical shell reflector with PVDF-TrFE thin film, addressing the issue of thermal sensitivity and proposing a balanced design for improved surface figure accuracy. Research shows that the balanced design is more effective for a petal reflector compared to a full reflector in terms of reducing surface figure error and control voltages.
Article
Engineering, Mechanical
Kainan Wang, Yian Yu, Andre Preumont
Summary: This paper presents wavefront control strategies for an ultra-lightweight composite reflector made of polymers for the large primary of a space telescope. The shape control is achieved using patterned unimorph strain actuators attached to the reflector. The mechanical behaviors and limitations of the actuators are analyzed, and the morphing capabilities of segmented and monolithic reflectors are evaluated. A compound control strategy involving a deformable relay mirror is proposed to compensate for residual surface errors.
Article
Environmental Sciences
Kainan Wang, Yian Yu, Yuxuan Gong, Yang Yi, Xuemin Zhang
Summary: This paper addresses the challenges and proposes solutions for ground-based observation of Low Earth Orbit (LEO) targets. The study successfully improves image quality and tracks fast-moving objects using Adaptive Optics (AO) and post-processing techniques. The feasibility of continuous monitoring and tracking of objects is also demonstrated.
Article
Chemistry, Analytical
Kainan Wang, Yian Yu, Andre Preumont
Summary: This paper focuses on studying the change of morphing abilities of a deformable mirror affected by environmental factors in space. It considers the impact of thermal and mechanical conditions on the mirror's performance and discusses the uncertainties they bring to the design of control methods.
Article
Chemistry, Analytical
Kainan Wang, Yuxuan Gong, Yian Yu, Andre Preumont
Summary: This paper explores advanced shape control techniques for ultra-lightweight electro-actuated polymers with composite ferroelectric thin films and proposes a hierarchical control strategy to rectify shape errors in lightweight reflectors.
Article
Engineering, Mechanical
Yousef Farid, Liang Wang, Lorenzo Brancato, Han Wang, Kainan Wang, Andre Preumont
Summary: After introducing the COLIBRI project, this paper focuses on the flight dynamics of a flapping-wing robot near hovering. The system needs active stabilization and attitude reconstruction due to its natural instability. The paper explores two methods, the complementary filter and the full-state dynamic observer, for attitude reconstruction in the presence of flapping noise. A numerical simulation is conducted to compare the performance of the two methods using experimental data.
Article
Engineering, Aerospace
Bin Wu, Jiewei Lin, Anshun Xie, Ning Wang, Guichang Zhang, Junhong Zhang, Huwei Dai
Summary: This study investigates the impact of bird strikes on engine blades in aviation accidents using simulation methods. The results show that the severity of bird strikes is related to the impact location distribution, with blade-root impacts being the most dangerous. Small flocking bird strikes have minimal effect on the fan compared to medium flocking birds and large single birds.
Article
Engineering, Multidisciplinary
A. A. Aganin, A. I. Davletshin
Summary: A mathematical model of interaction of weakly non-spherical gas bubbles in liquid is proposed in this paper. The model equations are more accurate and compact compared to existing analogs. Five problems are considered for validation, and the results show good agreement with experimental data and numerical solutions. The model is also used to analyze the behavior of bubbles in different clusters, providing meaningful insights.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Hao Wu, Jie Sun, Wen Peng, Lei Jin, Dianhua Zhang
Summary: This study establishes an analytical model for the coupling of temperature, deformation, and residual stress to explore the mechanism of residual stress formation in hot-rolled strip and how to control it. The accuracy of the model is verified by comparing it with a finite element model, and a method to calculate the critical exit crown ratio to maintain strip flatness is proposed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Shengwen Tu, Naoki Morita, Tsutomu Fukui, Kazuki Shibanuma
Summary: This study aimed to extend the finite element method to cope with elastic-plastic problems by introducing the s-version FEM. The s-version FEM, which overlays a set of local mesh with fine element size on the conventional FE mesh, simplifies domain discretisation and provides accurate numerical predictions. Previous applications of the s-version FEM were limited to elastic problems, lacking instructions for stress update in plasticity. This study presents detailed instructions and formulations for addressing plasticity problems with the s-version FEM and analyzes a stress concentration problem with linear/nonlinear material properties.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bo Fan, Zhongmin Wang
Summary: A 3D rotating hyperelastic composite REF model was proposed to analyze the influence of tread structure and rotating angular speed on the vibration characteristics of radial tire. Nonlinear dynamic differential equations and modal equations were established to study the effects of internal pressure, tread pressure sharing ratio, belt structure, and rotating angular speed on the vibration characteristics.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
X. W. Chen, Z. Q. Yue, Wendal Victor Yue
Summary: This paper examines the axisymmetric problem of a flat mixed-mode annular crack near and parallel to an arbitrarily graded interface in functionally graded materials (FGMs). The crack is modeled as plane circular dislocation loop and an efficient solution for dislocation in FGMs is used to calculate the stress field at the crack plane. The analytical solutions of the stress intensity factors are obtained and numerical study is conducted to investigate the fracture mechanics of annular crack in FGMs.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xumin Guo, Jianfei Gu, Hui Li, Kaihua Sun, Xin Wang, Bingjie Zhang, Rangwei Zhang, Dongwu Gao, Junzhe Lin, Bo Wang, Zhong Luo, Wei Sun, Hui Ma
Summary: In this study, a novel approach combining the transfer matrix method and lumped parameter method is proposed to analyze the vibration response of aero-engine pipelines under base harmonic and random excitations. The characteristics of the pipelines are investigated through simulation and experiments, validating the effectiveness of the proposed method.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Xiangyu Sha, Aizhong Lu, Ning Zhang
Summary: This paper investigates the stress and displacement of a layered soil with a fractional-order viscoelastic model under time-varying loads. The correctness of the solutions is validated using numerical methods and comparison with existing literature. The research findings are of significant importance for exploring soil behavior and its engineering applications under time-varying loads.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Thuy Dong Dang, Thi Kieu My Do, Minh Duc Vu, Ngoc Ly Le, Tho Hung Vu, Hoai Nam Vu
Summary: This paper investigates the nonlinear torsional buckling of corrugated core sandwich toroidal shell segments with functionally graded graphene-reinforced composite (FG-GRC) laminated coatings in temperature change using the Ritz energy method. The results show the significant beneficial effects of FG-GRC laminated coatings and corrugated core on the nonlinear buckling responses of structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Zhihao Zhai, Chengbiao Cai, Qinglai Zhang, Shengyang Zhu
Summary: This paper investigates the effect of localized cracks induced by environmental factors on the dynamic performance and service life of ballastless track in high-speed railways. A mathematical approach for forced vibrations of Mindlin plates with a side crack is derived and implemented into a train-track coupled dynamic system. The accuracy of this approach is verified by comparing with simulation and experimental results, and the dynamic behavior of the side crack under different conditions is analyzed.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
James Vidler, Andrei Kotousov, Ching-Tai Ng
Summary: The far-field methodology, developed by J.C. Maxwell, is utilized to estimate the effective third order elastic constants of composite media containing random distribution of spherical particles. The results agree with previous studies and can be applied to homogenization problems in other fields.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Kim Q. Tran, Tien-Dat Hoang, Jaehong Lee, H. Nguyen-Xuan
Summary: This study presents novel frameworks for graphene platelets reinforced functionally graded triply periodic minimal surface (GPLR-FG-TPMS) plates and investigates their performance through static and free vibration analyses. The results show that the mass density framework has potential for comparing different porous cores and provides a low weight and high stiffness-to-weight ratio. Primitive plates exhibit superior performance among thick plates.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Bence Hauck, Andras Szekrenyes
Summary: This study explores several methods for computing the J-integral in laminated composite plate structures with delamination. It introduces two special types of plate finite elements and a numerical algorithm. The study presents compact formulations for calculating the J-integral and applies matrix multiplication to take advantage of plate transition elements. The models and algorithms are applied to case studies and compared with analytical and previously used finite element solutions.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Wu Ce Xing, Jiaxing Wang, Yan Qing Wang
Summary: This paper proposes an effective mathematical model for bolted flange joints to study their vibration characteristics. By modeling the flange and bolted joints, governing equations are derived. Experimental studies confirm that the model can accurately predict the vibration characteristics of multiple-plate structures.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Pingchao Yu, Li Hou, Ke Jiang, Zihan Jiang, Xuanjun Tao
Summary: This paper investigates the imbalance problem in rotating machinery and finds that mass imbalance can induce lateral-torsional coupling vibration. By developing a model and conducting detailed analysis, it is discovered that mass imbalance leads to nonlinear time-varying characteristics and there is no steady-state torsional vibration in small unbalanced rotors. Under largely unbalanced conditions, both resonant and unstable behavior can be observed, and increasing lateral damping can suppress instability and reduce lateral amplitude in the resonance region.
APPLIED MATHEMATICAL MODELLING
(2024)
Article
Engineering, Multidisciplinary
Yong Cao, Ziwen Guo, Yilin Qu
Summary: This paper investigates the mechanically induced electric potential and charge redistribution in a piezoelectric semiconductor cylindrical shell. The results show that doping levels can affect the electric potentials and mechanical displacements, and alter the peak position of the zeroth-order electric potential. The doping level also has an inhibiting effect on the first natural frequency. These findings are crucial for optimizing the design and performance of cylindrical shell-shaped sensors and energy harvesters.
APPLIED MATHEMATICAL MODELLING
(2024)
