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257 条记录 (耗时 0.025 秒)

    Fairing skin repair method based on measured wing data
    82.
    发明授权
    Fairing skin repair method based on measured wing data 有权

    公开(公告)号：US11535400B2

    公开(公告)日：2022-12-27

    申请号：US17169505

    申请日：2021-02-07

    申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

    发明人： Jun Wang ,  Xiaoge He ,  Yuanpeng Liu ,  Yuan Zhang

    IPC分类号： B64F5/40 ,  G06T7/33 ,  G05B19/4097 ,  G06K9/62 ,  G06T5/00 ,  G06V10/75 ,  G06V10/48 ,  G06V10/77

    摘要： A fairing skin repair method based on measured wing data includes fairing skin registration. Data set P1 through denoising and filtering wing point cloud data is reorganized to obtain a key point set P. A histogram feature descriptor in a normal direction of any key point in set P and a skin point cloud data Q is calculated. Euclidean distance between feature descriptors of two points is calculated through K-nearest neighbor algorithm, and points with high similarity are added into a set M. A clustering is performed on set M using a Hough voting algorithm to obtain a local point cloud set P′ in set P. The method includes fairing skin repair. The boundary line of the point frame is projected onto Q, and a distance between a projection line on the point cloud and the boundary line is calculated to obtain an amount of skin to be repaired.

    Point cloud denoising method based on deep learning for aircraft part
    83.
    发明授权
    Point cloud denoising method based on deep learning for aircraft part 有权

    公开(公告)号：US11514555B2

    公开(公告)日：2022-11-29

    申请号：US17169534

    申请日：2021-02-07

    申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

    发明人： Jun Wang ,  Dening Lu ,  Dawei Li

    IPC分类号： G06T5/00 ,  G01B11/24 ,  G06N3/04 ,  G06N3/08

    摘要： The present disclosure provides a point cloud denoising method based on deep learning for an aircraft part, in which different degrees of Gaussian noise are added based on a theoretical data model of the aircraft part, a heightmap for each point in the theoretical data model is generated, and a deep learning training set is constructed. A deep learning network is trained based on the constructed deep learning training set, to obtain a deep learning network model. A real aircraft part is scanned via a laser scanner to obtain measured point cloud data. The normal information of the measured point cloud is predicted based on the trained deep learning network model. Based on the predicted normal information, a position of each point in the measured point cloud data is further updated, thereby completing denoising of the measured point cloud data.

    LABYRINTH SEALING DEVICE FOR REDUCING GAS INTRUSION
    84.
    发明申请
    LABYRINTH SEALING DEVICE FOR REDUCING GAS INTRUSION 有权

    公开(公告)号：US20220349480A1

    公开(公告)日：2022-11-03

    申请号：US17615114

    申请日：2020-09-27

    申请人： Nanjing University of Aeronautics and Astronautics

    发明人： Bo ZHANG ,  Yuanxiang CHEN ,  Zhiguo WANG ,  Honghu JI

    IPC分类号： F16J15/447

    摘要： A labyrinth sealing device for reducing gas intrusion is provided. A sealing bush is provided with a jet hole at the front of a tooth tip gap. The jet hole faces a tip of a corresponding sealing tooth. A gas flow injected by the jet hole suppresses hot gas flowing into the tooth tip gap. The sealing bush is provided with a first intercepting member at the rear of the tooth tip gap, and the sealing tooth is provided with a second intercepting member at the rear of the tooth tip gap. The first intercepting member hinders hot gas flowing against an inner wall of the sealing bush, and the second intercepting member hinders hot gas flowing against the sealing tooth, such that a part of the hot gas flows in a reverse direction and is violently mixed with subsequent hot gas.

    Method and system for determining helicopter rotor airfoil
    86.
    发明授权
    Method and system for determining helicopter rotor airfoil 有权

    公开(公告)号：US11423201B2

    公开(公告)日：2022-08-23

    申请号：US17312336

    申请日：2020-08-07

    申请人： Nanjing University of Aeronautics and Astronautics

    发明人： Qijun Zhao ,  Bo Wang ,  Simeng Jing ,  Guoqing Zhao ,  Xi Chen ,  Qing Wang

    IPC分类号： G06F30/28 ,  G06F30/15 ,  B64C27/467 ,  G06K9/62 ,  G06F113/08 ,  G06F111/06

    摘要： The present disclosure provides a method and system for determining a helicopter rotor airfoil. The method includes: randomly generating a sample point by using a Latin hypercube sampling (LHS) method (S1); determining characterization equations of upper and lower airfoil surfaces of an airfoil based on the airfoil sample point by using a class shape transformation (CST) method (S2); performing dynamic characteristic simulation on the airfoil according to the characterization equations of the upper and lower airfoil surfaces by using a computational fluid dynamics (CFD) method, to obtain a flow field characteristic of the airfoil (S3); establishing a mapping relationship between the sample point and the flow field characteristic by using a Kriging model, and training the mapping relationship by using a maximum likelihood estimation method and an expected improvement (EI) criterion, to obtain a trained mapping relationship (S4); determining an optimal sample point based on the trained mapping relationship by using Non-dominated Sorting Genetic Algorithm II (NSGA-II) (S5); and determining a rotor airfoil based on the optimal sample point (S6). The method performs optimized design on aerodynamic characteristics of the airfoil in a state with a changing incoming flow and a changing angle of attack, and can effectively alleviate dynamic stall in this state.

    Spinel-reinforced magnesium oxide-based foam ceramic filter and preparation method therefor
    87.
    发明授权
    Spinel-reinforced magnesium oxide-based foam ceramic filter and preparation method therefor 有权

    公开(公告)号：US11358081B2

    公开(公告)日：2022-06-14

    申请号：US16753546

    申请日：2018-06-01

    申请人： JIANGSU ZHONGYI AUTOMOBILE NEW MATERIAL TECHNOLOGY CO., LTD. ,  NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

    发明人： Xiqin Liu ,  Zili Liu ,  Siyu Liu ,  Jian Li

    IPC分类号： C04B35/626 ,  B01D39/20 ,  C04B35/053 ,  C04B38/06

    摘要： A spinel-reinforced magnesium oxide-based foam ceramic filter that is obtained by coating onto a polyurethane foam carrier a slurry of light calcined magnesium oxide-based ceramic comprising a nanometer lanthanum oxide sintering aid, and then drying and sintering. A method for preparing the foam ceramic filter comprising: 1) preparing a ceramic slurry having a solid content of 60%-70% by dosing 15%-25% by mass of a nanometer alumina sol, 0.8%-1.5% by mass of a rheological agent, and the balance magnesium oxide ceramic powder comprising a nanometer lanthanum oxide sintering aid, and then adding absolute ethanol and ball milling to mix until uniform; 2) soaking a polyurethane foam template into the ceramic slurry, squeezing by a roller press the polyurethane foam template to remove redundant slurry therein to make a biscuit, and then removing the ethanol solvent in a ventilation chamber at a temperature of 40° C.-50° C. to dry the biscuit; 3) putting the dried biscuit into a sintering furnace, elevating the temperature to 1350° C.-1550° C. and performing a high temperature sintering, cooling to the room temperature with the furnace to obtain the magnesium oxide-based ceramic foam filter.

    FMCW-BASED VR ENVIRONMENT INTERACTION SYSTEM AND METHOD
    88.
    发明申请
    FMCW-BASED VR ENVIRONMENT INTERACTION SYSTEM AND METHOD 有权

    公开(公告)号：US20220163652A1

    公开(公告)日：2022-05-26

    申请号：US17665581

    申请日：2022-02-06

    申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

    发明人： Yanchao ZHAO ,  Wenhao JIANG ,  Si LI

    IPC分类号： G01S13/34 ,  G01S13/36 ,  G01S13/48

    摘要： A frequency modulated continuous wave (FMCW)-based virtual reality (VR) environment interaction system and method are provided. Signal generators (S1, S2, S3) are provided to transmit FMCW signals; a glove is worn on a hand by a user; and multiple signal receiving nodes (H) are provided on the glove and configured to receive the FMCW signals. When the signal receiving nodes (H) receive the FMCW signals, one-dimensional distances are measured by means of FMCW technique; after the distances are measured, positions of the signal receiving nodes (H) in a coordinate system of the signal generators (S1, S2, S3) are calculated; a change in a position of the hand that wears the glove is tracked by means of changes in the positions of the signal receiving nodes (H); and a VR interaction is performed by outputting a change in a coordinate point matrix formed by the signal receiving nodes (H).

    METHOD FOR COMPONENT-LEVEL NON-ITERATIVE CONSTRUCTION OF AIRBORNE REAL-TIME MODEL OF VARIABLE-CYCLE ENGINE
    89.
    发明申请
    METHOD FOR COMPONENT-LEVEL NON-ITERATIVE CONSTRUCTION OF AIRBORNE REAL-TIME MODEL OF VARIABLE-CYCLE ENGINE 有权

    公开(公告)号：US20220121787A1

    公开(公告)日：2022-04-21

    申请号：US17312396

    申请日：2021-01-07

    申请人： NANJING UNIVERSITY OF AERONAUTICS AND ASTRONAUTICS

    发明人： Feng LU ,  Zhihu LI ,  Jinquan HUANG ,  Wenxiang ZHOU ,  Xunkai WEI

    IPC分类号： G06F30/17 ,  G06F111/10

    摘要： The present invention discloses a method for component-level non-iterative construction of an airborne real-time model of a variable-cycle engine, which is proposed by using an existing nonlinear component-level dynamic general model of a variable-cycle engine in combination with a modeling idea of an aero-engine LPV model. In the original nonlinear component-level general model of the variable-cycle engine, components are connected together through a system of nonlinear co-working equations, and characteristic parameters of the respective components are obtained by iteratively solving the system of nonlinear co-working equations. In such a process of iteratively solving the system of nonlinear equations, much time is taken to operate the model. In the component-level non-iterative method for the variable-cycle engine, an LPV model replaces such a process of iteratively solving the system of nonlinear equations, and can significantly reduce the time taken by and increase the real-time performance of a model of the variable-cycle engine.