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    Ultra-low-power speech feature extraction circuit based on non-overlapping framing and serial FFT
    111.
    发明授权
    Ultra-low-power speech feature extraction circuit based on non-overlapping framing and serial FFT 有权

    公开(公告)号：US11651766B2

    公开(公告)日：2023-05-16

    申请号：US17181908

    申请日：2021-02-22

    Applicant: SOUTHEAST UNIVERSITY

    Inventor： Weiwei Shan ,  Lixuan Zhu ,  Jun Yang ,  Longxing Shi

    IPC: G10L15/02 ,  G06F17/14 ,  G10L25/24

    CPC classification number: G10L15/02 ,  G06F17/142 ,  G10L25/24

    Abstract: The present invention discloses an ultra-low-power speech feature extraction circuit based on non-overlapping framing and serial fast Fourier transform (FFT), and belongs to the technical field of computation, calculation or counting. The circuit is oriented to the field of intelligence, and is integrally composed of a pre-process module, a windowing module, a Fourier transform module, a Mel filtering module, an adjacent frame merging module, a discrete cosine transform (DCT) module and other modules by optimizing the architecture of a Mel-frequency Cepstral Coefficients (MFCC) algorithm. Large-scale storage caused by framing is avoided in a non-overlapping framing mode, storage contained in the MFCC algorithm is further reduced, and the circuit area and the power consumption are greatly reduced. An FFT algorithm in the feature extraction circuit adopts a serial pipeline mode to process data, makes full use of the characteristics of serial inflow of audio data, and further reduces the storage area and operations of the circuit.

    Integral lifting system and lifting method for assembled members
    112.
    发明授权
    Integral lifting system and lifting method for assembled members 有权

    公开(公告)号：US11629033B2

    公开(公告)日：2023-04-18

    申请号：US17352380

    申请日：2021-06-21

    Applicant: Southeast University

    Inventor： Hui Jin ,  Haihan Jiao ,  Zhaozhong Li ,  Guansi Liu ,  Libin Wang

    IPC: B66C23/26 ,  B66C23/80

    Abstract: Disclosed are an integral lifting system and lifting method for assembled members. The integral lifting system includes fixing mechanisms and more than four vertical stand columns. The four vertical stand columns are located at four corners of a building, the building is located in a region encircled by the vertical stand columns, a transverse rail beam is disposed between every two vertical stand columns, one end of the transverse rail beam is mounted at the top of one vertical stand column, and the other end is mounted on the top of the other stand column. The transverse rail beam is provided with an operation trolley, a jib crane is disposed on an upper surface of the operation trolley, and a lifting mechanical arm is disposed on an outer side surface of the operation trolley. A hydraulic jacking mechanism is disposed at the bottoms of the vertical stand columns.

    TOPOLOGY OF SERIES-CONNECTED MMC WITH A SMALL NUMBER OF MODULES
    113.
    发明申请
    TOPOLOGY OF SERIES-CONNECTED MMC WITH A SMALL NUMBER OF MODULES 有权

    公开(公告)号：US20230017288A1

    公开(公告)日：2023-01-19

    申请号：US17640603

    申请日：2021-05-07

    Applicant: SOUTHEAST UNIVERSITY

    Inventor： Wu CHEN ,  Liangcai SHU ,  Haozhe JIN

    IPC: H02J3/38 ,  H02M1/088 ,  H02J3/36

    Abstract: The present disclosure relates to the field of electric power system, and more particularly to a topology of a series-connected MMC with a small number of modules, where the topology is composed of a three-phase bridge circuit, half-bridge valve strings, a three-phase filter inductor, and a three-phase grid frequency transformer. The topology of a series-connected MMC with a small number of modules in the present disclosure needs only two half-bridge valve strings, thus greatly reducing the number of the submodules as compared with the conventional MMC structure. When achieving the same high DC voltage output, the present disclosure can improve the power density of the MMC, realize stable three-phase AC output voltage, and further achieve balance of capacitor voltages in the two half-bridge valve strings. Compared to the conventional MMC topology, the topology in the present disclosure can reduce the number of submodules by nearly 2/3, and has a greater AC-DC voltage transfer ratio, thus reducing the cost of the MMC converter, reducing the device size, and improving the power density.

    TYPE-II AEBS TEST AND EVALUATION DEVICE AND METHOD BASED ON BEIDOU SPACE-TIME REFERENCE
    114.
    发明申请
    TYPE-II AEBS TEST AND EVALUATION DEVICE AND METHOD BASED ON BEIDOU SPACE-TIME REFERENCE 有权

    公开(公告)号：US20230013071A1

    公开(公告)日：2023-01-19

    申请号：US17784806

    申请日：2021-09-23

    Applicant: Southeast University

    Inventor： Qimin XU ,  Xu LI

    IPC: G01M17/007 ,  G07C5/00 ,  G08G1/01

    Abstract: Disclosed are a Type-II Autonomous Emergency Braking System (AEBS) test and evaluation device and method based on a BeiDou space-time reference, where the device includes three parts: a roadside-end information acquisition module, a vehicle-end information acquisition module, and an integrated information processing module. The roadside-end information acquisition module can acquire accurate message sending time by means of a BeiDou time service unit; the vehicle-end information acquisition module can acquire accurate time of receiving a roadside-end message, information acquired by a combined inertial navigation unit, and audio/vibration information acquired by a Single Chip Microcomputer (SCM) embedded unit; and the integrated information processing module can implement accurate, quantitative test and evaluation of indexes such as a vehicle-road communication delay and warning signal sending time. The method of the present disclosure performs data analysis and processing based on a globally unified BeiDou space-time reference and by means of a Support Vector Machine (SVM)-based dynamic Hermite interpolation method, which has an accurate test and evaluation result. Further, the method does not have any requirements for a communication system of the type-II AEBS, thus achieving convenient testing and a wide range of application.

    CONTROL METHOD OF DUAL THREE-PHASE PERMANENT MAGNET SYNCHRONOUS MOTOR BY ALTERNATELY PERFORMING SAMPLING AND CONTROL PROCEDURES
    116.
    发明申请
    CONTROL METHOD OF DUAL THREE-PHASE PERMANENT MAGNET SYNCHRONOUS MOTOR BY ALTERNATELY PERFORMING SAMPLING AND CONTROL PROCEDURES 有权

    公开(公告)号：US20230006582A1

    公开(公告)日：2023-01-05

    申请号：US17629243

    申请日：2021-04-20

    Applicant: SOUTHEAST UNIVERSITY

    Inventor： Zheng WANG ,  Minrui GU

    IPC: H02P21/00 ,  H02K11/33 ,  H02P21/18 ,  H02P25/022

    Abstract: The present invention discloses a control method of a dual three-phase permanent magnet synchronous motor by alternately performing sampling and control procedures, which belongs to the field of power generation, power transformation or power distribution technologies. Sampling instants, vector loading instants, and reference value tracking instants of two sets of windings alternate in two halves of a sampling period, and the equivalent sampling frequency of the motor drive system is doubled and the digital delay and the predictive horizon are halved without changing the sampling frequency of a single set of three-phase windings. In addition, by means of a two-layer MPC strategy, a deficient-rank problem is settled that the controlled dimensionality of the system is reduced to two dimensions but the motor control objective is still four dimensions caused by the method with controlling a dual three-phase permanent magnet synchronous motor by alternately performing sampling and control procedures. According to the control method of a dual three-phase permanent magnet synchronous motor by alternately performing sampling and control procedures provided in the present invention, the steady-state and dynamic control performance of a motor drive system for a dual three-phase permanent magnet synchronous motor is effectively improved, and computation burden of the control algorithm is reduced.

    MOTION CONSTRAINT-AIDED UNDERWATER INTEGRATED NAVIGATION METHOD EMPLOYING IMPROVED SAGE-HUSA ADAPTIVE FILTERING
    117.
    发明申请
    MOTION CONSTRAINT-AIDED UNDERWATER INTEGRATED NAVIGATION METHOD EMPLOYING IMPROVED SAGE-HUSA ADAPTIVE FILTERING 有权

    公开(公告)号：US20220404152A1

    公开(公告)日：2022-12-22

    申请号：US17779167

    申请日：2021-07-28

    Applicant: SOUTHEAST UNIVERSITY

    Inventor： Xiyuan CHEN ,  Siyi ZHANG ,  Xiaotian ZHANG ,  Junwei WANG

    IPC: G01C21/20 ,  G01C21/16

    Abstract: A motion constraint-aided underwater integrated navigation method employing improved Sage-Husa adaptive filtering includes establishing a Doppler log error model; constructing a state equation for an underwater integrated navigation system employing Kalman filtering; according to a relationship between a centripetal acceleration and a forward velocity of an underwater vehicle, establishing a constraint condition, and constructing a complete motion constraint model; establishing two measurement equations; and establishing a filter equation, conducting calculation by using a standard Kalman filtering algorithm when an underwater glider normally runs, and conducting time updating, measurement updating and filtering updating by using an improved Sage-Husa adaptive filtering algorithm when a measurement noise varies. The motion constraint-aided underwater integrated navigation method improves a filtering accuracy of the underwater integrated navigation system, restrains a filter divergence and has robustness and reliability.

    POWER CALCULATION METHOD OF MAGNETIC CIRCUIT
    119.
    发明申请
    POWER CALCULATION METHOD OF MAGNETIC CIRCUIT 有权

    公开(公告)号：US20220373621A1

    公开(公告)日：2022-11-24

    申请号：US17609703

    申请日：2021-01-22

    Applicant: SOUTHEAST UNIVERSITY

    Inventor： Ming CHENG ,  Zheng WANG ,  Xinkai ZHU ,  Wei QIN

    IPC: G01R33/12 ,  G01R21/133

    Abstract: Disclosed is a power calculation method of a magnetic circuit. In view of the power problem of a magnetic circuit and the phase problem of a magnetomotive force (MMF) and a magnetic flux in the magnetic circuit, the present disclosure draws a magnetic circuit vector diagram based on an equivalent magnetic circuit vector model, and provides a method for calculating virtual magnetic active power, virtual magnetic reactive power, and virtual magnetic complex power of the magnetic circuit by analyzing the MMF, the magnetic flux, the reluctance, and the magnetic reactance in the magnetic circuit by using the magnetic circuit vector diagram. A mathematical relationship between the virtual magnetic power of the magnetic circuit and the electric power of the corresponding equivalent electric circuit is derived according to a conversion factor between the virtual magnetic power and the electric power, so that the electric power can be directly calculated according to magnetic parameters such as the MMF and the magnetic flux in the magnetic circuit. The power calculation method of the magnetic circuit provided in the present disclosure can calculate and analyze the virtual magnetic power of the magnetic circuit according to the magnetic circuit vectors, so as to calculate the electric power from the magnetic circuit through conversion. The electric power can be solved according to the magnetic circuit vectors directly when the electric vectors are not available to calculate electric power in electromagnetic components.

    FOUR-DIMENSIONAL OVER THE AIR PERFORMANCE TEST METHOD FOR DYNAMIC SCENE CHANNEL
    120.
    发明申请
    FOUR-DIMENSIONAL OVER THE AIR PERFORMANCE TEST METHOD FOR DYNAMIC SCENE CHANNEL 有权

    公开(公告)号：US20220368439A1

    公开(公告)日：2022-11-17

    申请号：US17862051

    申请日：2022-07-11

    Applicant: SOUTHEAST UNIVERSITY

    Inventor： Zhengbo JIANG ,  Zhanyuan WANG ,  Chong GUO ,  Wei HONG ,  Zhangcheng HAO

    IPC: H04B17/391 ,  H04B17/00

    Abstract: The present disclosure discloses a four-dimensional over the air performance test method for a dynamic scene channel. By constructing a time-domain non-stationary dynamic scene channel model, and selecting over the air (OTA) probes of appropriate number, positions and power weight in a four-dimensional multi-probe anechoic chamber (4D-MPAC) test system through a probe selection algorithm, finally a 4D-MPAC dynamic channel test system for a target channel in a DUT test area is constructed, which makes a contribution to solve the current problem of OTA performance test for a time-domain non-stationary channel. The present disclosure aims to provide a four-dimensional multi-probe anechoic chamber (4D-MPAC) for the dynamic scene channel, which can effectively and accurately reproduce a target dynamic scene channel model in an anechoic chamber on the basis of reducing the cost of the test system as much as possible by constructing the dynamic scene channel model, and provide an index for judging the accuracy of constructing the dynamic scene channel model.

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