公开(公告)号：US11809517B1

公开(公告)日：2023-11-07

申请号：US18123234

申请日：2023-03-17

Applicant: Southwest Jiaotong University

Inventor： Zefeng Wen ,  Qinglin Xie ,  Gongquan Tao

IPC: G06F17/18 ,  G06F17/10

CPC classification number: G06F17/18 ,  G06F17/10

Abstract: An adaptive method of cleaning structural health monitoring (SHM) data based on local outlier factor is provided, including following steps: step 1: dividing SHM data to be analyzed into a series of data segments by using adaptive sliding window (ASW) technology; step 2: extracting time-domain statistical factors and frequency-domain statistical factors of each of the data segments to refine data information, thereby forming objects for study; step 3: calculating an outlier degree of each of the objects by using a weighted multiscale local outlier factor (WMLOF) based on feature factors; and step 4: detecting anomalies in SHM data by comparing a WMLOF value with a threshold value. The adaptive method can improve data quality effectively.

公开(公告)号：US20230347948A1

公开(公告)日：2023-11-02

申请号：US18052794

申请日：2022-11-04

Applicant: Southwest Jiaotong University

Inventor： Zefeng Wen ,  Xiaolong Liu ,  Xinbiao Xiao ,  Shulin Liang

IPC: B61L23/04 ,  G06K9/62 ,  G06N20/10

CPC classification number: B61L23/045 ,  G06K9/6256 ,  G06N20/10

Abstract: The present disclosure discloses a rail corrugation recognition method and apparatus based on a support vector machine, a device, and a medium. The method includes: obtaining wheel-rail noise signals in different time periods, and obtaining wheel-rail noise time domain information; dividing the wheel-rail noise time domain information into segmented wheel-rail noise time domain information corresponding to each of the different time periods; preprocessing each piece of segmented wheel-rail noise time domain information, and extracting a time domain statistical characteristic quantity and frequency domain eigenmode energy of each piece of segmented wheel-rail noise time domain information, to obtain a multi-dimensional wheel-rail noise characteristic vector; constructing a rail corrugation state recognition model based on a support vector machine, and training the rail corrugation state recognition model; and recognizing to-be-recognized wheel-rail noise data by using the rail corrugation state recognition model based on a support vector machine, to obtain a rail corrugation state.

公开(公告)号：US11801756B2

公开(公告)日：2023-10-31

申请号：US18179982

申请日：2023-03-07

Applicant: Southwest Jiaotong University

Inventor： Zigang Deng ,  Hongfu Shi ,  Yuqing Xiang ,  Ting Cao ,  Hao Lu ,  Junzhi Liu ,  Le Liang ,  Jun Zheng

IPC: B60L13/04

CPC classification number: B60L13/04 ,  B60L2200/26

Abstract: A permanent magnet electrodynamic suspension system includes a conductor track and a suspension and guidance device. The conductor track is disposed on a roadbed, and the suspension and guidance device is disposed above the conductor track. The suspension and guidance device includes a first permanent magnet array and a second permanent magnet array. The first permanent magnet array and the second permanent magnet array are the same in the magnetization direction arrangement. The first permanent magnet array and the second permanent magnet array are arranged perpendicular to each other. A guidance method for the permanent magnet electrodynamic suspension system is further provided.

公开(公告)号：US11787816B2

公开(公告)日：2023-10-17

申请号：US17746938

申请日：2022-05-17

Applicant: Southwest Jiaotong University

Inventor： Xianli Zhou ,  Shuai Huang ,  Feng Gao ,  Lin Chen

IPC: C07D487/22 ,  C07F1/04 ,  C07F1/00 ,  A61P35/00

CPC classification number: C07D487/22 ,  A61P35/00 ,  C07F1/005 ,  C07F1/04

Abstract: A chlorin compound, and a preparation and use thereof, related to medicine. The chlorin compound is represented by formula (I), or a salt, a stereisomer, a hydrate, a solvate or a prodrug thereof.

公开(公告)号：US20230324581A1

公开(公告)日：2023-10-12

申请号：US18297455

申请日：2023-04-07

Applicant: Southwest Jiaotong University

Inventor： Kaiwen LIU ,  Ruizhe QIU ,  Qian SU ,  Jun GAO ,  Pengpeng NI ,  Yanfei PEI

IPC: G01V99/00 ,  B61L23/04 ,  G06F30/25

CPC classification number: G01V99/005 ,  B61L23/04 ,  G06F30/25 ,  E01B1/002

Abstract: A ballastless track roadbed damage forewarning method considering uncertainty includes the following steps. Step 1: counting roadbed material parameters and precipitation; Step 2: establishing a FLAC-PFC model of a ballastless track roadbed and calibrating mesoscopic parameters of a roadbed surface layer; Step 3: generating a lognormal random field of particle contact friction coefficients and assigning it to particle contact nodes of the roadbed surface layer; Step 4: perform sampling on the precipitation and adjusting a fluid domain of the roadbed surface layer; Step 5: determining a worst spatial correlation distance in the random field; and Step 6: calculating a damage probability pf of the roadbed surface layer under the worst spatial correlation distance; outputting alarm information when pf exceeds an alarm threshold, otherwise, quitting. The method monitors and gives early warning of damage to the roadbed surface layer under dynamic loads, ensuring driving safety.

公开(公告)号：US20230324504A1

公开(公告)日：2023-10-12

申请号：US17993918

申请日：2022-11-24

Applicant: Southwest Jiaotong University

Inventor： Xihua ZOU ,  Peixuan LI ,  Wenlin BAI ,  Jia YE ,  Lianshan YAN ,  Wei PAN

IPC: G01S7/00 ,  H04B1/04 ,  H04B1/16 ,  H04L27/20

CPC classification number: G01S7/003 ,  H04L27/20 ,  H04B1/16 ,  H04B1/04

Abstract: An integrated photonics millimeter wave (MMW) radar communication system based on analog phase modulation scheme includes an integrated photonics MMW radar communication signal transmitter, a radar receiver, and a communication receiver. The transmitter includes a radar communication signal analog phase modulation module, an optical frequency comb (OFC) module, an electro-optic modulator (EOM), an optical shaping filter, an optical power divider, a photoelectric detector, an electric power amplifier, and a transmitting antenna that are cascaded sequentially. The radar receiver includes a radar receiving antenna, an electric low-noise amplifier (LNA), an optical phase modulator, an optical bandpass filter (BPF), a low-speed photoelectric detector, an electric low-pass filter, and a low-speed oscilloscope that are cascaded sequentially. In the communication receiver, a communication receiving antenna is sequentially cascaded with an electric LNA, a frequency mixer, and an oscilloscope, and a voltage-controlled oscillator is cascaded with a frequency multiplier and then connected to the frequency mixer.

公开(公告)号：US20230288636A1

公开(公告)日：2023-09-14

申请号：US17980607

申请日：2022-11-04

Applicant: Southwest Jiaotong University

Inventor： Xihua ZOU ,  Changjian XIE ,  Xiaojun XIE ,  Wei PAN ,  Lianshan YAN

IPC: G02B6/12

CPC classification number: G02B6/12011 ,  G02B2006/12164

Abstract: A super-compact arrayed waveguide grating (AWG) wavelength division multiplexer based on a sub-wavelength grating is provided and includes an input waveguide, a first planar waveguide, an arrayed waveguide, a second planar waveguide, and the output waveguide that are sequentially connected. The input waveguide has 1 port, and the output waveguide has 8 ports. The arrayed waveguide includes 50 equivalent uniform strip waveguides with the same length difference, and each of the equivalent uniform strip waveguides is configured as a sub-wavelength grating structure, thereby forming the effect of increasing group refractive index or transmission delay based on a slow light effect. The 8 channels with a channel spacing of 200 GHz have the minimum adjacent channel crosstalk of less than -27 dB, and the overall size is within 300×230 µm2. In the multiplexer, the overall integration size of the device is reduced by an order of magnitude.

公开(公告)号：US20230281352A1

公开(公告)日：2023-09-07

申请号：US17949226

申请日：2022-09-21

Applicant: Southwest Jiaotong University

Inventor： Lin JING ,  Xingya SU ,  Chao FENG ,  Kai LIU ,  Xiongfei ZHOU ,  Kaiyun WANG

IPC: G06F30/15 ,  G06F30/20 ,  B61L23/04

CPC classification number: G06F30/15 ,  G06F30/20 ,  B61L23/045

Abstract: The present application provides a simulation method for equivalent fatigue damage of wheel-rail steel, and relates to the study of wheel-rail relationship of rail transportation. After obtaining the train load spectrum when the target train serves for the preset mileage, the wheel-rail systematic 3D model corresponding to the target train is assigned to simulate the load according to the train load spectrum to obtain the stress spectrum of the dangerous part of the rim, and determine the target stress and stress application frequency corresponding to the expected simulated mileage according to the stress spectrum of the dangerous part of the rim. Then, the driving fatigue test machine carries out fatigue tests on the wheel-rail steel fatigue sample of the target train according to the target stress and stress application frequency, and obtains the equivalent fatigue damage data of the wheel-rail steel at the expected simulated mileage of the target train.

公开(公告)号：US11745598B2

公开(公告)日：2023-09-05

申请号：US18179965

申请日：2023-03-07

Applicant: Southwest Jiaotong University

Inventor： Zigang Deng ,  Kaiwen Li ,  Xin Liu ,  Hongfu Shi ,  Le Liang ,  Jun Zheng

IPC: B60L13/10 ,  B61B13/08 ,  B60B19/00

CPC classification number: B60L13/10 ,  B60B19/006 ,  B61B13/08 ,  B60L2200/26

Abstract: A magnetic wheel driving device and a driving method using the same. The magnetic wheel driving device includes a vehicle body, a guide rail system, at least two magnetic wheel systems and a power system. The guide rail system includes two conductor plates, respectively arranged at two sides of the vehicle body. The at least two magnetic wheel systems are symmetrically arranged at two side walls of the vehicle body. A gap is provided between each magnetic wheel system and the corresponding conductor plate. The power system is configured to drive the at least two magnetic wheel systems to rotate.

公开(公告)号：US20230241980A1

公开(公告)日：2023-08-03

申请号：US18179982

申请日：2023-03-07

Applicant: Southwest Jiaotong University

Inventor： Zigang DENG ,  Hongfu SHI ,  Yuqing XIANG ,  Ting CAO ,  Hao LU ,  Junzhi LIU ,  Le LIANG ,  Jun ZHENG

IPC: B60L13/04

CPC classification number: B60L13/04 ,  B60L2200/26

Abstract: A permanent magnet electrodynamic suspension system includes a conductor track and a suspension and guidance device. The conductor track is disposed on a roadbed, and the suspension and guidance device is disposed above the conductor track. The suspension and guidance device includes a first permanent magnet array and a second permanent magnet array. The first permanent magnet array and the second permanent magnet array are the same in the magnetization direction arrangement. The first permanent magnet array and the second permanent magnet array are arranged perpendicular to each other. A guidance method for the permanent magnet electrodynamic suspension system is further provided.