公开(公告)号：US20230117718A1

公开(公告)日：2023-04-20

申请号：US17995953

申请日：2020-07-27

申请人： Ningbo Institute of Technology, Beihang University ,  Beihang University

发明人： Shiqiang Zheng ,  Shitong Wei ,  Tong Wen ,  Kun Wang ,  Yun Le ,  Kun Mao ,  Di Wang

IPC分类号： H02K11/215 ,  H02K29/08 ,  G01R33/07 ,  G01B7/02 ,  G01D5/14

摘要： The present disclosure provides a displacement detection circuit of a maglev rotor system and a displacement self-sensing system thereof. The displacement detection circuit comprises a current sampling circuit (10) configured to collect a current flowing through a corresponding coil (4); coils (4), which are coils (4) distributed in series in the maglev rotor system; Hall sensors (20), the Hall sensors (20) being arranged in an upper auxiliary air gap (8) and a lower auxiliary air gap (8) of the maglev rotor system, and sensing surfaces of the Hall sensors (20) being perpendicular to magnetic field directions in the corresponding auxiliary air gaps (8); a Hall signal processing circuit (30) connected to the Hall sensors (20) and configured to differentiate a Hall sensing signal corresponding to the upper auxiliary air gap (8) and a Hall sensing signal corresponding to the lower auxiliary air gap (8); and a displacement signal resolving circuit (40) connected to the current sampling circuit (10) and the Hall signal processing circuit (30) respectively and configured to acquire a displacement of a rotor in the maglev rotor system according to the current and a differentiation result. By using the detection circuit and the displacement self-sensing system thereof, the axial size of the rotor is reduced, such that detection and control are coplanar, and high precision and simple design are realized.

公开(公告)号：US12130143B1

公开(公告)日：2024-10-29

申请号：US18648109

申请日：2024-04-26

申请人： BEIHANG UNIVERSITY

发明人： Xiaoxiao Zhang ,  Yang Yang ,  Zhihao Gao ,  Minghua Zhang ,  Kaiquan Cai

IPC分类号： G01C21/30

CPC分类号： G01C21/30

摘要： An airport surface semantic path representation and an outlier taxiing pattern detection method for airport operation management, semantic conversion is realized based on dynamic features in an aircraft taxiing process, and after combining with surface map topology information, an airport surface aircraft semantic path representation is obtained; road segment geographic information is used to allocate a road segment weight to improve a longest common sub-sequence method, thereby constructing a flight path similarity matrix and using hierarchical clustering to realize surface taxiing pattern recognition; finally, by calculating the internal similarity of the identified patterns, the maximum outlier for identifying outlier patterns is obtained; after calculating the similarity between subsequent input flight paths and each pattern, as well as comparing a corresponding outlier with the maximum reachable outlier, the prewarning of outlier flight paths is achieved, the safety of surface management is ensured, and the effective surface control is realized.

公开(公告)号：US12116102B2

公开(公告)日：2024-10-15

申请号：US17827950

申请日：2022-05-30

申请人： Beihang University

发明人： Kangwen Sun ,  Xinzhe Ji ,  Haoquan Liang ,  Xiao Guo

IPC分类号： B64B1/62 ,  B60L8/00 ,  B60L58/30 ,  B64B1/22 ,  B64B1/64 ,  H01M8/04082 ,  H01M8/0656

CPC分类号： B64B1/62 ,  B60L8/003 ,  B60L58/30 ,  B64B1/22 ,  B64B1/64 ,  H01M8/04201 ,  H01M8/0656 ,  B60L2200/10 ,  H01M2250/20 ,  H01M2250/402

摘要： An airship and its long-term floating capacity maintenance method are disclosed. The airship includes an airship capsule and a pod at bottom. A renewable fuel cell and a water tank communicated with each other are arranged in the pod. The water tank is provided with a water inlet connected with a filling aircraft outside the airship. The airship capsule is provided with a solar cell. The interior of the airship capsule is provided with a hydrogen storage bag. The solar cell is electrically connected with the renewable fuel cell. The renewable fuel cell can use electric energy provided by the solar cell to electrolyze water provided by the filling aircraft into hydrogen and supplement the hydrogen to the hydrogen storage bag. The airship can supplement hydrogen to the airship capsule by electrolyzing water to reduce the phenomenon of insufficient gas in the airship capsule.

公开(公告)号：US20240340172A1

公开(公告)日：2024-10-10

申请号：US18377201

申请日：2023-10-05

申请人： BEIHANG UNIVERSITY

发明人： Haogang ZHU ,  Shizhao PENG ,  Jiarui TU

IPC分类号： H04L9/08

CPC分类号： H04L9/0861 ,  H04L2209/46

摘要： The present disclosure provides a secure three-party multiplication method and system for privacy computing, involving the technical field of privacy computing. The method includes that an auxiliary compute node generates three groups of random matrix pairs randomly and transmits the random matrix pairs to three parties, and the three parties compute respective sum matrixes based on a sum of respective random matrixes and private matrixes, respectively Â, Ĉ and {circumflex over (B)}. A second party generates a matrix set according to a sum matrix, a first party obtains Ta based on the matrix set and its own secret matrix, the second party obtains Tb based on its own random secret matrix and Ta, and the third party generates its own random secret matrix based on Tb and the matrix set, and obtains a product matrix according to three random secret matrixes. The present disclosure can improve reliability of result accuracy.

公开(公告)号：US20240306913A1

公开(公告)日：2024-09-19

申请号：US18670811

申请日：2024-05-22

申请人： BEIHANG UNIVERSITY ,  SUZHOU SURGI-MASTER HIGH TECH CO., LTD.

发明人： Shuhua YUE ,  Xun CHEN ,  Pu WANG

IPC分类号： A61B5/00

CPC分类号： A61B5/0035 ,  A61B5/0066 ,  A61B5/0075 ,  A61B5/0084 ,  A61B5/6847 ,  A61B2560/0462 ,  A61B2562/0233 ,  A61B2576/00

摘要： The present disclosure relates to a multi-modal imaging device. The multi-modal imaging device includes: a Raman spectroscopic analysis module configured to obtain Raman spectroscopic information of a target object on a first sampling position by using excitation light; an optical coherence tomography module configured to obtain a tissue structure image of the target object on a second sampling position by using imaging detection light; and a co-localization module configured to control the first sampling position of the excitation light in the Raman spectroscopic analysis module and/or the second sampling position in the optical coherence tomography module according to a determined concerned area of the target object, so that the first sampling position and the second sampling position are spatially co-localized in the concerned area.

公开(公告)号：US20240241954A1

公开(公告)日：2024-07-18

申请号：US18398453

申请日：2023-12-28

申请人： Beihang University

发明人： Tianbo WANG ,  Mengyao LIU ,  Chunhe XIA ,  Liqun YANG

IPC分类号： G06F21/56

CPC分类号： G06F21/566

摘要： A method of detecting Android malware based on a heterogeneous graph and an apparatus thereof are provided, including: constructing a target heterogeneous graph according to entities and entity relationship information extracted from an application to be tested; determining a KL distance between any two meta-paths, and taking the meta-paths in which the KL distance is greater than a preset threshold as a plurality of finally selected meta-paths; carrying out, by RBM, feature fusion on the plurality of meta-paths, and adjusting, by an automatic encoder, fusion parameters of initial fusion vectors to meet a predetermined condition to obtain a plurality of fusion feature vectors; inputting the plurality of fusion feature vectors into a trained Deep Neural Network (DNN) for classification to obtain a final classification result, and determining whether the application to be tested is Android malware according to the final classification result.

公开(公告)号：US20240183998A1

公开(公告)日：2024-06-06

申请号：US18138156

申请日：2023-04-24

申请人： Beihang University

发明人： Yanbo ZHU ,  Zhipeng WANG ,  Kun FANG ,  Jingtian DU ,  Hongxia WANG

IPC分类号： G01S19/40

CPC分类号： G01S19/40

摘要： An ARAIM availability prediction method under a complex terrain environment is provided. The method includes: 1) selecting positioning points according to an air line; 2) calculating terrain shielding angles; 3) predicting visible satellites; 4) determining a fault mode that needs to be monitored; 5) calculating a positioning error variance, an influence coefficient of a nominal deviation, and a variance of a solution separation test statistic; and 6) calculating a threshold of a solution separation test, calculating a protection level, and determining availability. According to the method, the terrain shielding angles are calculated based on terrain model data, and the visible satellites are predicted based on ephemeris data or almanac data to further calculate a protection level, while determining the availability; and the accuracy of availability prediction can, by considering the effect of terrain barriers on the prediction of the visible satellites, be improved to ensure the safety of aircrafts.

公开(公告)号：US20240143999A1

公开(公告)日：2024-05-02

申请号：US18199363

申请日：2023-05-19

申请人： BEIHANG UNIVERSITY ,  Beijing Big Data Center ,  Xicheng Dist Bureau of Sci and Tech and Info Tech of Beijing Muni (Xicheng Dist Big Data Mgmt

发明人： Pan DENG ,  Yu ZHAO ,  Lin ZHANG ,  Xiaofeng JIA ,  Yan LIU ,  Junting LIU ,  Mulan WANG

IPC分类号： G06N3/08 ,  G06N3/0455

CPC分类号： G06N3/08 ,  G06N3/0455

摘要： The present invention provides a multi-modal data prediction method based on a causal Markov model, belonging to the technical field of intelligent traffic technology; the method of the present invention includes: collecting regional data and multi-modal traffic data of a research region; taking the time position, the regional point of interest and the weather information as conditional feature variables; taking the regional attraction factor, the bicycle demand factor, the taxi demand factor, the bus demand factor and the traffic speed factor as physical concept variables; taking the bicycle traffic flow, the taxi traffic flow, the bus traffic flow and the regional speed as multi-modal traffic data observation variables, and describing the generation process of the multi-modal traffic flow by using a causal Markov process; solving the causal Markov process by using a neural network, and training a built neural network for the multi-modal traffic data observation.

公开(公告)号：US20240139391A1

公开(公告)日：2024-05-02

申请号：US18384326

申请日：2023-10-26

申请人： Beihang University

发明人： Zengsheng CHEN ,  Yubo FAN ,  Xiaoyan DENG

IPC分类号： A61M1/16 ,  B01D63/04

CPC分类号： A61M1/1698 ,  A61M1/1625 ,  A61M1/1629 ,  B01D63/04 ,  A61M2202/0007 ,  A61M2202/0028 ,  A61M2202/0208 ,  A61M2205/02 ,  Y10S261/28

摘要： Disclosed is a blood oxygenator. The blood oxygenator includes a blood inlet chamber, and a housing. A hollow cavity is arranged in the housing, and includes a heat exchange zone and a gas exchange zone. Multiple heat exchange filaments are arranged in the heat exchange zone. Multiple hollow fibrous membrane fibers are arranged in the gas exchange zone. The blood inlet chamber includes an inverted conical side wall and an end surface hermetically connected to an opening at one end of the inverted conical side wall, an opening at the other end of the inverted conical side wall is hermetically connected to one end of the housing, and the other end of the housing is hermetically connected with a cover body. The cover body is provided with a blood outlet, and the end surface is provided with a spiral liquid inlet pipe coaxial with the blood inlet chamber.

公开(公告)号：US11964349B2

公开(公告)日：2024-04-23

申请号：US17968880

申请日：2022-10-19

申请人： BEIHANG UNIVERSITY

发明人： Wuxiang Zhang ,  Baowen Zhang ,  Xilun Ding

IPC分类号： B23P19/02

CPC分类号： B23P19/02

摘要： The present invention relates to a system and its control method for press-fit equipment for shaft-hole fit parts. The automatic press-fit control system mainly includes a control center, a loading and unloading control subsystem, a visual inspection subsystem, and a press-fit control subsystem, and each subsystem communicates with the control center through a communication interface. The control center automates the operation of each subsystem independently, such as the product loading and unloading process, the visual inspection process, and the press-fit process through the control center. The advantages of the invention are: it can realize automatic loading, inspection, and press-fit of the product, which greatly improves the level of production automation and production efficiency; the control system adopts modular design, and each subsystem can operate independently under the control of the control center; it adopts visual inspection and automatic compensation of angle deviation, with good fault tolerance.