Article
Meteorology & Atmospheric Sciences
Rui Liu, Junjie Zhang, Xiaofan Yang, Shaomin Liu, Liqiang Kang
Summary: The study simulated airflow around various arrangements of vegetative windbreaks using a modified CFD model and discussed optimal designs. A correction factor for the effects of vegetative windbreak vibration was proposed and calibrated, with quantitative expressions established for structural parameters. Numerical experiments identified optimal parameters for vegetative windbreaks under different wind speeds, aiding in optimizing designs to prevent wind erosion.
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
(2021)
Article
Engineering, Chemical
Yasser Elhenawy, Yasser Fouad, Haykel Marouani, Mohamed Bassyouni
Summary: This study evaluated the effect of functionalized multi-walled carbon nanotubes on the performance of glass fiber-reinforced polypropylene for wind turbine blades. Analysis using the Ansys computer package was conducted to study the mechanical and physical properties of the material composites, as well as the influence of fiber loading on the mechanical properties of the PP nanocomposites.
Article
Physics, Multidisciplinary
Lei Zhao, Xuedong Ma, Lingling Li
Summary: Granular matter is a complex system composed of particles that exhibit different separation behaviors under various excitation methods. This study used the DEM-CFD coupling method to simulate the separation of polypropylene particles and found that the combination of vertical vibration and constant airflow induced Reverse Brazil Nut Separation. The study also confirmed the role of filling theory in explaining the change of particle separation state. Additionally, adjusting parameters such as vibration acceleration and airflow velocity can promote or inhibit the formation of particle separation, and changing the shape of the container or increasing the filling rate can eliminate particle accumulation.
Article
Engineering, Electrical & Electronic
Zihao Dong, Dawei Shen, Zheng Gong, Deyuan Zhang, Yonggang Jiang
Summary: A flexible flow sensor is proposed for measuring airflow velocity and incident angle, consisting of a polyimide substrate, flat cantilever beam, and graphene piezoresistor. It demonstrates a wide detection range, high resolution, and better sensitivity to incident angles compared to curved cantilever sensors. Placement of these sensors on an airfoil is discussed for estimating flight parameters.
IEEE SENSORS JOURNAL
(2022)
Article
Agricultural Engineering
Ling Wang, Qihang Hou, Junpeng Wang, Zhiwei Wang, Shumao Wang
Summary: The study demonstrates that the variation in inner tilt angles of a six-rotor UAV can affect the distribution characteristics of the downwash airflow field, thereby influencing the uniformity of droplet deposition. Calibration tests with the developed system showed high accuracy and reliability, providing important basis for the design of plant protection drones.
INTERNATIONAL JOURNAL OF AGRICULTURAL AND BIOLOGICAL ENGINEERING
(2021)
Article
Materials Science, Multidisciplinary
Linpeng Liu, Xiancun Meng, Changchao Zhang, You Chen, Tao Sun, Zhilai Lu, Junqiu Zhang, Shichao Niu, Zhiwu Han, Ji-An Duan
Summary: In this study, a sensor with multiple critical functions is successfully realized by introducing microslit structures and superhydrophobic surface coatings. The sensor, made of low-cost and degradable paper, exhibits high sensitivity and waterproofness.
JOURNAL OF MATERIALS CHEMISTRY C
(2022)
Article
Engineering, Mechanical
Weipeng Hu, Mengbo Xu, Jiangrui Song, Qiang Gao, Zichen Deng
Summary: In the first stage deployment of the IKAROS solar sail, a simplified coupling dynamic model is proposed to analyze the active axial stretching of the flexible beam. A structure-preserving approach is constructed to simulate the evolution of the transverse vibration of the beam and rotation of the hub. The numerical results show that there are coupling effects between the beam deformation, active stretching, and hub rotation in the stretching stage.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Engineering, Multidisciplinary
Agnieszka Padewska-jurczak, Piotr Szczepaniak, Ryszard Walentynski
Summary: The aim of this study is to determine the aerodynamic force coefficients in the case of airflow around two smooth or rough cylinders positioned at different angles. The results were compared with the values of the interference coefficient of the cylinders arranged in a row included in Eurocode EN 1991 part 4. Experimental tests conducted in a wind tunnel were used to determine the aerodynamic forces of the cylinder systems, and CFD simulations were prepared to verify the results.
BULLETIN OF THE POLISH ACADEMY OF SCIENCES-TECHNICAL SCIENCES
(2023)
Article
Engineering, Marine
Yifan Luo, Feng Qian, Hongxin Sun, Xiuyong Wang, Anhua Chen, Lei Zuo
Summary: A 14-degree-of-freedom flexible multibody dynamics model is developed and verified for a semisubmersible floating offshore wind turbine (FOWT), considering the coupled dynamics of various components subjected to wind and wave loads. The model is validated against the results from FAST in different load cases and can accurately reflect the vibration characteristics. The simplified model can provide a low-order method for structural dynamics analysis and advanced vibration control design for the FOWT.
Article
Mathematics, Applied
Chonggang Du, Zheng H. Zhu, Gangqiang Li
Summary: This paper investigates the impact of rigid-flexible coupling on the attitude dynamics of an electric solar wind sail (E-sail) through the development of a dynamic model. It finds that deformation motion of flexible tethers causes disturbance torques on the central spacecraft. The analysis also shows that the E-sail is more stable when the spin plane passes through the center of mass of the spacecraft.
COMMUNICATIONS IN NONLINEAR SCIENCE AND NUMERICAL SIMULATION
(2021)
Article
Engineering, Multidisciplinary
Ruibo Chen, Datong Qin, Changzhao Liu
Summary: The design of large wind turbine drivetrain systems is moving towards lighter weight and integration. Investigating the electromechanical-rigid-flexible interaction of wind turbine transmission systems is necessary for ensuring safe operation. This study proposed a dynamic model that considers electromechanical-rigid-flexible coupling, time-varying mesh stiffness, structural flexibility, magnetic saturation, and electromagnetic radial force. The effects of flexibility on the system's vibration characteristics were discussed, highlighting its significance for wind turbine drivetrain design.
ALEXANDRIA ENGINEERING JOURNAL
(2023)
Article
Green & Sustainable Science & Technology
Giacomo Della Posta, Stefano Leonardi, Matteo Bernardini
Summary: The study suggests that one-way coupled simulations tend to overestimate power production and structural oscillations in wind turbines. Flapwise blade vibration induces aerodynamic damping in the structural motion, while torsional deformation reduces power without introducing significant dynamical effects.
Article
Materials Science, Multidisciplinary
Athanasios Tzanis, Manos Zeibekis, Alexandra Pilidi, Nikolaos Koutsokostas, Constantina Kollia, Thanassis Speliotis
Summary: The article investigates the structural and magnetic behavior of Cobalt thin films deposited on flexible Kapton substrates by magnetron sputtering. Structural characterization was done by X-ray diffraction and morphology was analyzed with scanning electron microscopy. Magnetic properties were studied using vibrating sample magnetometry. The results showed a non-monotonic behavior in magnetization of Co films with increasing strain, attributed to the interaction of two main mechanisms involving changes in interatomic distances and microstructural modifications.
MATERIALS SCIENCE AND ENGINEERING B-ADVANCED FUNCTIONAL SOLID-STATE MATERIALS
(2021)
Article
Energy & Fuels
Fiona Dominique Luedecke, Martin Schmid, Eva Rehe, Sangamithra Panneer Selvam, Nejila Parspour, Po Wen Cheng
Summary: Generators in wind turbines are crucial for converting mechanical energy into electrical power. To reduce the weight of generators, a better understanding of electro-mechanical interactions is needed. This study presents a numerical model of a coupled electromagnetic-structural multi-body system and validates its applicability through experiments.
Article
Computer Science, Information Systems
Jingliang Wang, Mingyao Liu, Wenlin Liao, Kang Yun, Yuegang Tan, Zhiqiu Zhang
Summary: This paper proposes a curve interpolation method based on arc length parameters for interpolating the stress field of wind tunnel flexible plates. The optimum combination of parameters is calculated using the particle swarm optimization algorithm, resulting in small errors and insignificant increase in errors for higher-order interpolation calculations.
Article
Agriculture, Multidisciplinary
Gerassimos G. Peteinatos, Benjamin Kollenda, Pei Wang, Roland Gerhards
COMPUTERS AND ELECTRONICS IN AGRICULTURE
(2019)
Article
Chemistry, Analytical
Pei Wang, Wei Yu, Mingxiong Ou, Chen Gong, Weidong Jia
Correction
Chemistry, Analytical
Pei Wang, Wei Yu, Mingxiong Ou, Chen Gong, Weidong Jia
Article
Engineering, Electrical & Electronic
Samuel Appah, Huitao Zhou, Pei Wang, Mingxiong Ou, Weidong Jia
JOURNAL OF ELECTROSTATICS
(2019)
Article
Agronomy
Hui Li, Ilias Travlos, Lijun Qi, Panagiotis Kanatas, Pei Wang
Article
Agronomy
Samuel Appah, Weidong Jia, Mingxiong Ou, Pei Wang, Eric Amoah Asante
Article
Agricultural Engineering
Hao Zhang, Lijun Qi, Yalei Wu, Elizabeth M. Musiu, Zhenzhen Cheng, Pei Wang
BIOSYSTEMS ENGINEERING
(2020)
Article
Agronomy
Hao Zhang, Lijun Qi, Junjie Wan, Elizabeth M. Musiu, Jiarui Zhou, Zhongao Lu, Pei Wang
Summary: The study designed a WSPM-System to provide real data for numerical simulation of downwash airflow, with an effective communication distance of 100m and a packet loss rate of less than 1%. The research found that the load variation of the UAV sprayer affects rotor speed and downward velocity, with rotor speed showing a linear correlation with flight speed in forward flight and hovering, and pitch angle showing a positive correlation with flight speed.
Review
Agronomy
Long Wan, Hui Li, Chengsong Li, Aichen Wang, Yuheng Yang, Pei Wang
Summary: Pathogen infection has significantly reduced crop production, calling for rapid identification approaches to monitor diseases at the early infection stage. Hyperspectral imaging, as a fast and nondestructive sensing technology, has achieved remarkable results in plant disease identification.
Article
Agricultural Engineering
Aichen Wang, Binjie Gao, Huadong Cao, Pei Wang, Tong Zhang, Xinhua Wei
Summary: This study analyzed the optical response of oilseed rape leaves to Sclerotinia sclerotiorum and proposed a new method for early detection of sclerotinia disease based on optical properties. The optical absorption and reduced scattering coefficients of healthy and infected oilseed rape leaves were measured, and models were developed to discriminate infected leaves from healthy ones. The study demonstrated the potential of optical properties as a basis for early detection of sclerotinia disease.
BIOSYSTEMS ENGINEERING
(2022)
Article
Plant Sciences
Pei Wang, Fan Luo, Lihong Wang, Chengsong Li, Qi Niu, Hui Li
Summary: This paper proposes a model called S-ResNet to improve the identification accuracy of small insect targets. By improving the residual structure, introducing the Feature Multiplexing Module and the Adjacent Elimination Module, the model can extract features of small insect targets and eliminate useless information, thereby improving the identification accuracy.
FRONTIERS IN PLANT SCIENCE
(2022)
Article
Plant Sciences
Pei Wang, Yin Tang, Fan Luo, Lihong Wang, Chengsong Li, Qi Niu, Hui Li
Summary: This paper presents a dataset called Weed25, which consists of 14,035 images of 25 different weed species in fields. The dataset includes both monocot and dicot weed images, as well as images at different growth stages. Several deep learning detection models were used to train weed identification models using this dataset, with average detection accuracies ranging from 91.8% to 92.4%. The results show that Weed25 can be a potentially effective training resource for the development of real-time weed identification models in the field.
FRONTIERS IN PLANT SCIENCE
(2022)
Review
Agricultural Engineering
Samuel Appah, Pei Wang, Mingxiong Ou, Chen Gong, Weidong Jia
INTERNATIONAL JOURNAL OF AGRICULTURAL AND BIOLOGICAL ENGINEERING
(2019)