Article
Automation & Control Systems
Yuming Cui, Songyong Liu, Hongsheng Li, Congcong Gu, Hongxiang Jiang, Deyuan Meng
Summary: A multi-sensor fusion positioning system is developed based on the vibration characteristics of underground mobile devices to enhance the accuracy of positioning in GPS-denied underground coal mine roadways. The system combines inertial navigation, odometer, and ultra wide band technologies through extended Kalman filter and unscented Kalman filter. The proposed system achieves an accuracy level of 0.15 m, meeting most coal mine application requirements.
Article
Engineering, Electrical & Electronic
Chaoqun Zhao, Mark D. Ainslie, Jing Li, Wei Hong, Ying Xin
Summary: This study investigated the longitudinal magnetic field distribution of electromagnet guideway units in high-temperature superconducting maglev technology through measurement and simulation, validating the reliability of the simulation results. Additionally, the impact of magnetic field and current density distributions inside the superconductor on dynamic characteristics, as well as the feasibility of segmented instant excitation mode by coordinating the currents of EMGUs, were analyzed.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Computer Science, Artificial Intelligence
Jin Zhang, Qiuwei Liang, Yanjiao Shi
Summary: This paper proposes a novel position prior attention network (PPANet) for salient object detection, achieving fast and accurate detection through the position prior attention module and context fusion module. Experimental results demonstrate that PPANet performs excellently in terms of accuracy and real-time performance.
IMAGE AND VISION COMPUTING
(2022)
Article
Environmental Sciences
Xuan He, Shuguo Pan, Wang Gao, Xinyu Lu
Summary: In this paper, a LiDAR-inertial-GNSS fusion positioning algorithm based on voxelized accurate registration was proposed to address the insufficient accuracy and accumulated error of LiDAR-inertial odometry (LIO) point cloud registration in urban environments. The algorithm utilizes curvature segmentation for voxelized point cloud downsampling and constructs a point cloud registration model based on nearest neighbors. An iterative termination threshold is set to reduce local optimal solutions. The algorithm achieves more continuous and accurate position and attitude estimation and map reconstruction in urban environments.
Article
Engineering, Electrical & Electronic
James G. Storey, Rodney A. Badcock
Summary: The study investigates a novel thrust bearing geometry with a conical frustum-shaped permanent magnet levitating inside a high-temperature superconductor bulk, showing superior restoring forces and stiffness compared to conventional arrangements. The optimal angle of the frustum for levitation force is not universal, depending on displacement mode and dimensions, with correlations to magnetic flux for determining the angle best suited for the bearing's operating regime.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Computer Science, Artificial Intelligence
Daniel Laidig, Thomas Seel
Summary: The miniaturization of MEMS-based IMUs has made them widely used in various applications. Orientation estimation is a fundamental sensor fusion task for inertial motion tracking, and the accuracy of estimated orientations affects further data processing steps. This study proposes a quaternion-based orientation estimation algorithm that outperforms existing methods and achieves improved accuracy across different motion characteristics.
INFORMATION FUSION
(2023)
Article
Mathematics
Mislav Trbusic, Anton Hamler, Viktor Gorican, Marko Jesenik
Summary: The paper presents a contactless detection method for determining the position of a rod permanent magnet within a ferrofluid. The proposed approach is based on the solenoidal nature of the field lines. Numerical evaluation showed promising results, indicating the potential practical application of the technique. Compared to other techniques such as X-ray or Vernier-caliper-based methods, the proposed method is more suitable for applications where simplicity and robustness are crucial.
Article
Engineering, Multidisciplinary
Simon Hartlieb, Michael Tscherpel, Flavio Guerra, Tobias Haist, Wolfgang Osten, Michael Ringkowski, Oliver Sawodny
Summary: The experimental approach presents a highly accurate imaging-based stereo measurement setup with the ability to detect multiple target points with great precision. By holographically replicating each point light source and averaging the center positions of all spots on the camera sensor, the system achieves high accuracy.Validation with interferometers as reference sensors shows minimal residual error in two- and three-dimensional trajectory measurements.
Article
Engineering, Electrical & Electronic
Xiaojun Li, Alan Palazzolo, Zhiyang Wang
Summary: C5AMB is a novel 5-DOF active magnetic bearing system that provides radial, axial, and tilting levitation simultaneously while reducing costs and improving convenience of assembly. It utilizes low-cost materials to replace traditional silicon steels, resulting in higher energy density.
IEEE TRANSACTIONS ON TRANSPORTATION ELECTRIFICATION
(2021)
Article
Engineering, Electrical & Electronic
Guoyuan He, Mingyong Liu, Xiaoying Li, Honglong Chang, Weizheng Yuan, Guangmin Yuan
Summary: This article presents a pedestrian inertial navigation system based on a differential layout MIMU array composed of multiple low-cost MIMUs, utilizing two-stage data fusion to improve measurement accuracy and reduce positioning error. The device-level test results showed a reduction of 82.5% in noise performance, while the system-level test results indicated that the positioning error of pedestrian inertial navigation based on the MIMU array accounted for about 0.36% of the total mileage of 1.4 km.
IEEE SENSORS JOURNAL
(2023)
Article
Nuclear Science & Technology
Weiheng Lin, Jianqiang Zhu, Zhigang Liu, Xiangyang Pang, Yang Zhou, Wenhui Cui, Ziming Dong
Summary: Target alignment technology is crucial in laser fusion experiments, and this study proposes a method that combines open-loop and closed-loop errors to estimate the position of the target using a Kalman state observer, optimizing the target alignment and improving the precision, reliability, and repeatability of experimental results.
NUCLEAR ENGINEERING AND TECHNOLOGY
(2022)
Article
Computer Science, Artificial Intelligence
Yanzhou Su, Jian Cheng, Chuqiao Zhong, Chengzhi Jiang, Jin Ye, Junjun He
Summary: Colorectal polyps are potential precursors to colorectal cancer. This study proposes a novel neural network for polyp segmentation in endoscopy images, addressing the feature misalignment and boundary information issues. Experimental results show that the proposed method achieves state-of-the-art performance in polyp segmentation.
Article
Engineering, Electrical & Electronic
Long Kou, Zigang Deng, Haitao Li, Li Wang, Yingyu Rao, Zhihao Ke
Summary: This article investigates the lateral-vertical coupled dynamics of high-temperature superconducting (HTS) maglev, conducts scanning experiments on levitation force and guidance force, and establishes a 2-D force model based on finite element method and Lorentz force formula. The reliability of the proposed model is validated by comparing simulation results with experimental data. The 2-D force model is proven to be helpful for future research and calculation of the dynamics of HTS maglev.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2021)
Article
Energy & Fuels
Quan Jiang, Chongliang Xie
Summary: A multiphase data fusion simulation approach for discrete material transfer dispatch of the digital twin system is proposed to address the difficulty of dynamic data collecting and monitoring in this process. The method uses the Discrete Element Method (DEM) to obtain accurate force data on the structure and calculates it based on the Finite Element Method (FEM). The results show that the method can effectively analyze the interaction between the bulk and the structure and assist in predicting structure wear and managing the operating environment in the digital twin system.
Article
Engineering, Biomedical
Dimitrios S. Lampropoulos, George C. Bourantas, Benjamin F. Zwick, George C. Kagadis, Adam Wittek, Karol Miller, Vassilios C. Loukopoulos
Summary: In this study, computational fluid dynamics were used to simulate blood flow in intracranial aneurysms. The immersed boundary method was employed to overcome the bottleneck of mesh generation, and the proposed approach was validated through comparisons with experimental results.
INTERNATIONAL JOURNAL FOR NUMERICAL METHODS IN BIOMEDICAL ENGINEERING
(2021)
Article
Physics, Applied
Hiroshi Ueda, Hideaki Maeda, Yu Suetomi, Yoshinori Yanagisawa
Summary: This paper provides an overview of the combined effects of winding, cool-down, and screening current-induced stresses in REBCO coils. It introduces a simulation method to model the stress modification effect due to the screening-current and compares the results with experimental data. The study shows that epoxy impregnation can reduce the stress modification effect but increases the stress at the coil ends, potentially degrading the coil performance.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2022)
Article
Engineering, Electrical & Electronic
Kodai Shirai, Atsushi Ishiyama, Hiroshi Ueda, So Noguchi, Tomonori Watanabe, Shigeo Nagaya, Mitsuhiro Fukuda
Summary: This paper introduces a new-generation accelerator called HTS-SC and its application in cancer treatment. The article focuses on the impact of the magnetic field generated by the coil system of HTS-SC on particle acceleration and investigates methods to reduce magnetic field fluctuations.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
SeokBeom Kim, Hibiki Fukuda, Ryo Kimura, Ryota Inoue, Hiroshi Ueda, Akihiro Kikuchi, Yasuo Iijima
Summary: A research group at the National Institute for Materials Science (NIMS) in Japan has developed ultrafine Nb3Al wires with a diameter of less than 50 μm. These wires are intended to be used for superconducting applications cooled by cryocoolers. The critical currents of the wires were measured under conduction cooling conditions using a four-probe method, and it was found that the constant current method provided more accurate results than the current sweep method.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Ryota Inoue, Hiroshi Ueda, SeokBeom Kim
Summary: This study investigates a wireless power transmission system for railway vehicles using narrow REBCO wires in high-temperature superconducting coils. The research finds that the use of narrow wires in the coil structures leads to lower AC loss, higher coupling coefficient, and improved receiving power density of the wireless power transmission system.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Ryota Inoue, Hiroshi Ueda, SeokBeom Kim
Summary: In this study, the power transmission characteristics of the HTS cable termination applying a wireless power transmission (WPT) system were analyzed using equivalent circuit model and finite element method analysis. The results showed that the high-efficiency WPT system can be achieved by increasing the transport current of the HTS coil.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Yuta Miyake, Yuki Nakai, Ryota Inoue, SeokBeom Kim, Hiroshi Ueda, So Noguchi, Tomonori Watanabe, Shigeo Nagaya, Mitsuhiro Fukuda, Atsushi Ishiyama
Summary: This study presents a numerical evaluation of the mechanical properties of non-insulated REBCO coils in the Skeleton Cyclotron during charging and quenching. The results show that the radial current in the sector coil during quenching can generate rotating force and non-symmetric deformation.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
So Noguchi, Hiroshi Ueda, Tomonori Watanabe, Shigeo Nagaya, Atsushi Ishiyama, Mitsuhiro Fukuda
Summary: This paper presents the development of a cyclotron accelerator for medical radioisotope production, highlighting its features, the use of rare-earth barium copper oxide tapes for coil winding, and the optimization design method used. The compactness, light weight, and multi energy outputs of the developed cyclotron system make it suitable for medical use.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Hiroshi Ueda, Keisuke Naito, Ryota Inoue, SeokBeom Kim
Summary: In recent years, there has been significant progress in the use of high-field rare-earth barium copper oxide (REBCO) coils in NMR, MRI, and accelerator applications. However, issues such as non-uniform force distribution and the importance of turn-to-turn contact configurations in achieving stability and preventing damage are still not well understood. Further evaluation of the stress and strain during various processes is needed to clarify the detailed mechanism of damage in REBCO coils.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
Kazuki Kume, Ryota Inoue, Hiroshi Ueda, SeokBeom Kim
Summary: In recent years, there has been progress in developing high magnetic field magnets using high temperature superconducting wires. This study focuses on measuring the temperature dependence of the magnetic properties of metal substrates for the wires under conduction cooling conditions. The researchers have developed a compact single sheet tester to evaluate the magnetic properties and compared its accuracy with a conventional tester.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Physics, Applied
Takanobu Mato, Ryota Inoue, Hiroshi Ueda, SeokBeom Kim, So Noguchi
Summary: In this paper, we discuss the accuracy of contact resistance measurement using the low-frequency AC (LFAC) method and the relation between contact resistance and contact resistivity. Through experiments and simulations, we have proven the validity of the LFAC method and also identified the possibility of improving the measurement accuracy. Additionally, we found inconsistencies in the well-known relation between contact resistance and contact resistivity, which led us to investigate the relation through LFAC and sudden-discharging test simulations.
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Keisuke Naito, Ryo Harada, Ryota Inoue, SeokBeom Kim, Hiroshi Ueda, Yu Suetomi, Yoshinori Yanagisawa, Hideaki Maeda
Summary: REBCO wires with high critical current density and thermal stability find applications in various fields such as NMR, MRI, and accelerators. We are currently designing a 1.3-GHz LTS/HTS NMR magnet that operates in a persistent current mode. However, there are issues with using REBCO coils, particularly the non-uniform electromagnetic forces caused by screening currents.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Yuta Inoue, Ryota Inoue, Hiroshi Ueda, SeokBeom Kim
Summary: We proposed a large-capacity wireless power transmission (WPT) system for electric vehicles (EVs) with a high-temperature superconducting (HTS) coil installed on the ground side only. We analyzed the power transmission characteristics of the proposed 100 kW class WPT system using HTS and copper coils. We also investigated the effect of the HTS coil's cooling temperature on the receiving power and transmission efficiency of the WPT system.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
SeokBeom Kim, Hirotaka Kobayashi, Daiki Sato, Ryota Inoue, Hiroshi Ueda, Takanobu Mato, So Noguchi
Summary: We propose a method to measure the turn-to-turn contact resistance of no-insulation (NI) coils using low frequency alternating current (LFAC). The reliability of the proposed measurement method was confirmed by evaluating AC current distribution characteristics using smaller pickup coils. The non-uniformity of the contact resistance in NI coils was detected and the impact of multiple cooling cycles on the contact resistance was identified.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Ryota Inoue, Yuta Inoue, Hiroshi Ueda, SeokBeom Kim
Summary: This paper investigates a wireless power transmission (WPT) system using high-temperature superconducting (HTS) coils. The non-circular HTS coil structure with high misalignment tolerance is found to have improved transmission characteristics. The power transmission efficiency and receiving power can be optimized by adjusting the spacing and length of the non-circular coils.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Engineering, Electrical & Electronic
Hibiki Fukuda, Riku Onoue, Tomoya Sakamoto, Ryota Inoue, Hiroshi Ueda, SeokBeom Kim, Akihiro Kikuchi, Yasuo Iijima
Summary: Jelly-rolled Nb/Al composite monofilament Nb3Al superconducting wires with an outer diameter of 30 μm and multi-stranded Nb3Al wires have been successfully fabricated by NIMS in Japan. Temperature dependence of the critical current of Nb3Al wires in a cryocooler system for superconducting applications cooled by conduction cooling method is necessary. The critical current properties of single and multi-stranded ultrafine Nb3Al superconducting sample wires with different outer diameter were evaluated using the current sweep method and constant current method.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
