公开(公告)号：US11860411B2

公开(公告)日：2024-01-02

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：US20230219425A1

公开(公告)日：2023-07-13

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 ,  B60B19/00 ,  B61B13/08

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：US20230117087A1

公开(公告)日：2023-04-20

申请号：US17965795

申请日：2022-10-14

Applicant: Southwest Jiaotong University

Inventor： Pengfei SUN ,  Xiaoyun FENG ,  Qingyuan WANG ,  Junshu CHENG ,  Wensheng SONG

IPC: B61L27/04

Abstract: A train driver assistance method includes: acquiring basic data of a train under a complex and severe condition; determining whether a traction power system is normal according to the basic data; if so, acquiring an energy-efficient optimized speed profile of the train in a normal state according to the basic data of the train in the current state; and if not, acquiring an energy-efficient optimized speed profile of the train in an abnormal state according to the basic data of the train in the current state. In this way, the method can acquire the energy-efficient optimized speed profile of the train in its current state. The comprehensive electric train driver assistance method can enable the train to adapt to the complex and severe environment and realize the energy-efficient operation of the train and self-rescue of the train.

公开(公告)号：US20230048646A1

公开(公告)日：2023-02-16

申请号：US17980411

申请日：2022-11-03

Applicant: Southwest Jiaotong University

Inventor： Guoqing Gou ,  Feifei Qiu ,  Bing Chen ,  Yuzi Hu ,  Zhongyin Zhu ,  Junjun Jin

IPC: G01B17/00 ,  G01N29/04

Abstract: Disclosed is a method for measuring a deviation angle of a fatigue microcrack based on nonlinear ultrasound, comprising: preliminarily positioning a fatigue microcrack to obtain a center of the microcrack; selecting a horizontal positive direction, and defining an orientation angle; drawing a positive circumference on a surface of a metal plate, and selecting a fixed interval angle; placing an excitation sensor and a receiving sensor on the drawn positive circumference according to the orientation angle; ultrasonically testing each group of ultrasonic sensing paths, and recording time domain waveform signals formed by each group of ultrasonic sensing paths; converting each group of time domain waveform signals into a corresponding frequency domain graph, extracting an ultrasonic fundamental wave signal amplitude and a second harmonic waveform amplitude, and calculating a relative nonlinear coefficient; drawing an orientation angle-relative nonlinear coefficient polar coordinate graph; and determining a deviation angle of the microcrack.

公开(公告)号：US11543548B2

公开(公告)日：2023-01-03

申请号：US16939082

申请日：2020-07-27

Applicant: Southwest Jiaotong University

Inventor： Yingbin Zhang ,  Jing Liu ,  Haiying Fu ,  Qingdong Wang ,  Chenlin Xiang ,  Dejian Li ,  Jiangtao Wei ,  Yin Cheng ,  Zhiwang Chang ,  Pengcheng Yu

IPC: G01V1/28 ,  G06F16/29 ,  G01V1/00 ,  G06T17/05

Abstract: A mechanical-model based earthquake-induced landslide hazard assessment method in earthquake-prone mountainous area includes: obtaining the cohesion and internal friction angle through a geological map of the study area and a geotechnical physical parameter; obtaining simulated ground motions by combining a pulse-like ground motion effect model and a pulse-like ground motion response model; calculating slope permanent displacement according to the simulated ground motions, the cohesion, the internal friction angle and other parameters; obtaining a statistical relationship between the permanent displacement and a landslide probability according to permanent displacement data derived from historical earthquake-induced landslides and historical strong earthquake records; and predicting earthquake-induced landslide probability according to the slope permanent displacement and the statistical relationship between the permanent displacement and the landslide probability, and quantitatively evaluating earthquake-induced landslide hazard through the earthquake-induced landslide probability.

公开(公告)号：US11535990B2

公开(公告)日：2022-12-27

申请号：US17200932

申请日：2021-03-15

Applicant: Southwest Jiaotong University

Inventor： Zhixiang Yu ,  Liru Luo ,  Linxu Liao ,  Yuntao Jin ,  Lijun Zhang ,  Hu Xu ,  Lei Zhao ,  Hao Zhao ,  Shichun Zhao

IPC: E01F7/04

Abstract: A two-stage energy dissipation type shed tunnel support structure connected by a principle of Dougong and a design method thereof are provided. The two-stage energy dissipation type shed tunnel support structure includes a Dougong joint domain, crossbeams and columns. The Dougong joint domain includes section steel members, wavy-wall cylindrical elastoplastic buffers, U-shaped sliding connecting troughs and high-strength bolts. Multiple layers of the section steel members are orthogonally stacked to form a Dougong shape, the wavy-wall cylindrical elastoplastic buffers are arranged between adjacent layers of the section steel members, and the U-shaped sliding connecting troughs are arranged at upper and lower ends of the wavy-wall cylindrical elastoplastic buffers, which realizes a connection between the wavy-wall cylindrical elastoplastic buffers and a section steel in two orthogonal directions. Under an impact of small energy rockfalls, an elastic deformation of the Dougong joint domain is used to achieve a buffering.

公开(公告)号：US11498773B1

公开(公告)日：2022-11-15

申请号：US17867708

申请日：2022-07-19

Applicant: Southwest Jiaotong University

Inventor： Zeqiang Zhang ,  Hongbin Zheng ,  Yanqing Zeng ,  Silu Liu ,  Dan Ji ,  Xiaoyue Fang

IPC: B65G47/64 ,  B65G37/00 ,  B65G41/00

Abstract: A material layered conveying device based on a disassembly line, including a front section conveyor belt, a rear section conveyor belt, and a lower conveyor belt. An interval between the front and rear section conveyor belts is provided with two sets of movable conveyor belts arranged in side by side parallel, a lifting conveyor belt is provided below the interval and adjacent to and horizontal with the lower conveyor belt, and a lifting conveyor belt elevator is provided under the lifting conveyor belt. The lifting conveyor belt is driven vertically up, and the lifting conveyor belt is horizontal with the front and rear section conveyor belts when the lifting conveyor belt is moved to a maximum distance. The device adopts the movable dual conveyor belts of the respective levels of the upper and lower conveyor belts, and can achieve synchronous high-low transferring of the material when the material is conveyed.

公开(公告)号：US11488754B2

公开(公告)日：2022-11-01

申请号：US17539426

申请日：2021-12-01

Applicant: Southwest Jiaotong University

Inventor： Zigang Deng ,  Shaolei Sun ,  Yanzhi Liu ,  Jun Zheng

IPC: H05K7/20 ,  H01F6/04 ,  F16L59/147 ,  F25D19/00

Abstract: The present invention discloses a superconducting bulk cooling apparatus and cooling method for a high-temperature superconducting magnetic levitation vehicle. The superconducting bulk cooling apparatus for the high-temperature superconducting magnetic levitation vehicle includes a refrigerating machine, a vacuum box and a Dewar tank. A condensing tank is arranged in the vacuum box, and the condensing tank is communicated with the Dewar tank through a nitrogen siphon pipe and a liquid nitrogen return pipe; a heat exchanger connected with the refrigerating machine is arranged in the condensing tank; and a flexible isolation pipe for thermally insulating and isolating the nitrogen siphon pipe and the liquid nitrogen return pipe is connected between the vacuum box and the Dewar tank. The present invention pumps the phase-change nitrogen out of the Dewar tank through a siphoning effect, so that the immersion cooling of high-temperature superconducting bulks is separated from the re-condensation of the nitrogen.

公开(公告)号：US20220147666A1

公开(公告)日：2022-05-12

申请号：US17387865

申请日：2021-07-28

Applicant: Southwest Jiaotong University

Inventor： Ping WANG ,  Jingmang XU ,  Chenyang HU ,  Rong CHEN ,  Le LIU ,  Boyang AN ,  Zheng GONG ,  Jiasheng FANG

IPC: G06F30/23 ,  G06F17/14

Abstract: The present disclosure relates to the technical field of rail turnouts, and to a method for determining propagation characteristics of guided waves of a variable cross-section rail of a turnout. The method includes the following steps: step 1: establishing dispersion curves: separately calculating dispersion curves of sections of a variable cross-section rail, and fitting dispersion curves of different sections in a similar wave mode according to a longitudinal position to generate a “wavenumber-frequency-position” three-dimensional dispersion surface; step 2: analyzing dispersion characteristics: based on the “wavenumber-frequency-position” three-dimensional dispersion surface, using a semi-analytical finite element method to calculate a wavenumber-frequency dispersion curve and a guided wave structure of the characteristic section; and step 3: performing finite element simulation verification: establishing a switch rail model for simulation, then using two-dimensional fast Fourier transform (2D-FFT) to identify a frequency wavenumber dispersion curve of collected data.

公开(公告)号：US20220089196A1

公开(公告)日：2022-03-24

申请号：US17539409

申请日：2021-12-01

Applicant: Southwest Jiaotong University

Inventor： Zigang DENG ,  Hongfu SHI ,  Yuqing XIANG ,  Jun ZHENG ,  Huan HUANG

IPC: B61B13/08 ,  B60L13/04

Abstract: A levitation, propulsion and guidance integrated magnetic levitation system and an improvement method of levitation and guidance. The system includes a maglev train and a maglev track. The maglev train is provided with a permanent magnet array. The maglev track is provided with a driving device and a levitation driving device in sequence along a running direction of the maglev train. An iron plate is arranged in the middle of the maglev track. The driving device accelerates the maglev train from 0 to take-off velocity. The levitation driving device provides a driving force and a levitation force for the maglev train. The iron plate enables the centered running of the maglev train.