公开(公告)号：US12101161B2

公开(公告)日：2024-09-24

申请号：US17790070

申请日：2021-09-13

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Yuhua Su ,  Nan Zhao ,  Xiaowei Pang ,  Xu Jiang ,  Deyue Zou

IPC: H04B7/145 ,  H04B1/04 ,  H04B7/185 ,  H04J1/08 ,  H04W16/18 ,  H04W16/22

CPC classification number: H04B7/145 ,  H04W16/18 ,  H04W16/22

Abstract: The present invention provides a design method of a high energy efficiency Unmanned Aerial Vehicle (UAV) communication system assisted by an intelligent reflecting surface, and belongs to the technical field of UAV communication network energy efficiency optimization. A communication process comprises two transmission links, one link is directly sent from an information source to an information sink, and the other link is reflected and transmitted by an intelligent reflecting surface attached to a UAV. The two links exist simultaneously. Based on an idea of block iteration, an original problem is decomposed into three sub-problems, and a non-convex optimization problem is transformed into solvable concave-convex fractional program problems by a continuous convex approximation technique. The present invention provides a design method for joint optimization of a passive beamforming of the intelligent reflecting surface, an active beamforming of a base station and a flight trajectory of the UAV.

公开(公告)号：US12094152B2

公开(公告)日：2024-09-17

申请号：US17442937

申请日：2020-03-05

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Weiqiang Kong ,  Deyun Lv ,  Wei Zhong ,  Risheng Liu ,  Xin Fan ,  Zhongxuan Luo

IPC: G06T7/70 ,  G06T7/90

CPC classification number: G06T7/70 ,  G06T7/90

Abstract: The present invention discloses a method for fully automatically detecting chessboard corner points, and belongs to the field of image processing and computer vision. Full automatic detection of chessboard corner points is completed by setting one or a plurality of marks with colors or certain shapes on a chessboard to mark an initial position, shooting an image and conducting corresponding processing, using a homography matrix H calculated by initial pixel coordinates of a unit grid in a pixel coordinate system and manually set world coordinates in a world coordinate system to expand outwards, and finally spreading to the whole chessboard region. The method has the advantages of simple procedure and easy implementation; the principle of expanding outwards by a homography matrix is used, so that the running speed of the algorithm is fast; and the corner points obtained by a robustness enhancement algorithm is more accurate, so that the situation of inaccurate corner point detection in the condition of complex illumination is avoided.

公开(公告)号：US12088224B2

公开(公告)日：2024-09-10

申请号：US17640216

申请日：2021-05-06

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Ximing Sun ,  Jianyi Zhang

IPC: H02P6/18 ,  H02P21/00 ,  H02P21/18 ,  H02P25/022

CPC classification number: H02P21/0007 ,  H02P21/18 ,  H02P25/022 ,  H02P2207/05

Abstract: A finite time speed control method for a permanent magnet synchronous motor (PMSM) based on a fast integral terminal sliding mode and disturbance estimation comprises: firstly, determining a mathematical model of a speed loop of the PMSM under the influence of system parameters uncertainty and unknown load torque; secondly, designing an improved fast integral terminal sliding surface on the basis of the idea of terminal sliding mode control; then, proposing a disturbance estimation method based on an adaptive fuzzy system with respect to the disturbance in a PMSM system; designing a PMSM speed controller on this basis; and finally, completing the concrete implementation of the whole technical solution. The present invention designs the fast integral terminal sliding surface and a sliding mode control law to ensure that a motor speed tracking error converges to zero within finite time and enhances the rapidity of a PMSM speed regulating system.

公开(公告)号：US20240264002A1

公开(公告)日：2024-08-08

申请号：US18021904

申请日：2022-09-26

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Xiaohong LU ,  Chong MA ,  Zhenyuan JIA ,  Shixuan SUN ,  Yihan LUAN ,  Le TENG

IPC: G01J5/00 ,  B23K20/12

CPC classification number: G01J5/0018 ,  B23K20/1235 ,  G01J2005/0077

Abstract: The invention belongs to the field of friction stir welding (FSW) quality prediction and relates to an intelligent prediction method for the tensile strength of FSW joints considering welding temperature and axial force. The invention uses a combination of experiment and theory. FSW experiment is carried out, the infrared thermal imager and force sensor are used to obtain the temperature of the feature points on the advancing side and retreating side of the outside of the shoulder of the weldment surface and the axial force during FSW process. The obtained data is used to train and test the one-dimensional convolutional neural network. The tensile strength prediction of friction stir welding is realized, which provided a reference for welding process control.

公开(公告)号：US12054467B2

公开(公告)日：2024-08-06

申请号：US17296210

申请日：2020-04-14

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY ,  DALIAN QIYUAN TECHNOLOGY CO., LTD.

Inventor： Hongchen Guo ,  Quanren Zhu ,  Cuilan Miao

IPC: C07D301/12 ,  B01J8/18 ,  B01J29/89 ,  B01J35/40 ,  B01J37/00 ,  B01J37/04 ,  B01J37/06 ,  B01J37/08 ,  B01J37/10

CPC classification number: C07D301/12 ,  B01J8/18 ,  B01J29/89 ,  B01J35/40 ,  B01J37/0009 ,  B01J37/009 ,  B01J37/04 ,  B01J37/06 ,  B01J37/082 ,  B01J37/10 ,  B01J2229/18

Abstract: A fluidized reaction method for synthesizing propylene oxide by gas phase epoxidation of propylene and hydrogen peroxide relates to a microspherical alkali metal ion modified titanium silicalite zeolite TS-1 catalyst applicable to the reaction method, and a preparation method thereof. A gas-solid phase fluidized epoxidation method refers to a gas phase epoxidation method in which the raw materials of propylene and hydrogen peroxide are directly mixed in the gas phase under normal pressure and temperature above 100° C. and the feed gas enables the titanium silicalite zeolite TS-1 catalyst to be fluidized in an epoxidation reactor. A catalyst applicable to the reaction method is a microspherical alkali metal ion modified titanium silicalite zeolite TS-1 catalyst which has the main characteristic that alkali metal cations are reserved on the titanium silicalite zeolite.

公开(公告)号：US12044591B2

公开(公告)日：2024-07-23

申请号：US17259847

申请日：2020-08-26

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Zhenguo Jing ,  Wei Peng ,  Yueying Liu ,  Qiang Liu ,  Ang Li

IPC: G01L9/00 ,  G02B6/255

CPC classification number: G01L9/0077 ,  G02B6/2551 ,  G02B6/2552

Abstract: A miniature diaphragm-based fiber-optic tip FP pressure sensor, and fabrication method and application thereof. A miniature diaphragm-based fiber-optic tip FP pressure sensor includes an optical fiber, a hollow-core optical fiber, and a pressure sensing diaphragm, wherein the optical fiber and the hollow-core optical fiber have the same diameter, the two are spliced by arc welding; and the pressure sensing diaphragm is bonded to the endface of the hollow-core optical fiber by hydroxide catalysis bonding. The FP pressure sensor can not only realize the all-silica structure of a sensor, but also make the joint of each component free of organic polymer, and has extremely high long-term stability and thermal stability. Meanwhile, by a fabrication method of the miniature diaphragm-based fiber-optic tip FP pressure sensor, the application range and service life of the sensor are increased, and fabrication costs are reduced.

公开(公告)号：US20240233294A1

公开(公告)日：2024-07-11

申请号：US17778263

申请日：2021-05-08

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Shengfa WANG ,  Yiming ZHU ,  Xiaopeng ZHENG ,  Na LEI ,  Zhongxuan LUO ,  Fuwei CHEN ,  Yongjie WANG ,  Fan ZHANG

IPC: G06T19/20 ,  G06T17/20

CPC classification number: G06T19/20 ,  G06T17/20 ,  G06T2219/2021

Abstract: The present invention discloses a topological preserving deformation method for a 3D model based on a multiple volumetric harmonic field, and belongs to the fields of computer graphics, computational mathematics, topology and differential geometry. Firstly, a tetrahedral mesh is constructed between a source 3D model and a target 3D model; then, a domain of topological transformation in a deformation process is calculated based on a traditional single volumetric harmonic field; special multiple boundary conditions are set; next, a multiple volumetric harmonic field is calculated; and finally, topological preserving surface deformation is induced. The present invention can find the domain of topological transformation in the deformation process based on a saddle point in the traditional volumetric harmonic field, and can adaptively construct the multiple volumetric harmonic field that can induce topological preserving deformation, so as to generate topological preserving deformation surfaces under the guidance of the multiple volumetric harmonic field. The method has universality and high efficiency for 3D model deformation of the same topology, requires less computational cost compared with the traditional large deformation diffeomorphism metric mapping, and can be widely used.

公开(公告)号：US12011748B2

公开(公告)日：2024-06-18

申请号：US17779696

申请日：2021-06-30

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Siying Ling ,  Ming Ling ,  Xiangsheng Liu ,  Honglin Ren ,  Yang Yang ,  Liding Wang

IPC: B21B1/08 ,  B21B1/085

CPC classification number: B21B1/085

Abstract: A generating device based on friction drive for gear involute artifact with long-rolled path length by rolling method is proposes. The device includes a roller component, rail component and friction-driven component, wherein the roller component consists of a gear involute artifact with long rolled length, a mandrel, a multi-ball bearing for gear involute artifact, the base-circle plates, the parallel sleeves, a multi-ball bearing, the plain washers, the cross washers, and the locking nuts; the rail component consists of a foundation, a location baffle for base-circle plates, rails, the baffles, a location baffle for rail, copper washers, the connecting screws and the set screws of the rail; and the friction-driven component consists of a friction block, a motorized linear sliding table, a vertical sliding table, a vertical foundation and an adapter. It has good market application prospect and popularization value.

公开(公告)号：US12007362B2

公开(公告)日：2024-06-11

申请号：US17549908

申请日：2021-12-14

Applicant: Dalian University of Technology

Inventor： Shijie Jin ,  Li Lin ,  Chenfei Liu ,  Zhongbing Luo

IPC: G01N29/06 ,  G01N29/44

CPC classification number: G01N29/0645 ,  G01N29/4472 ,  G01N2291/023

Abstract: A method for reconstructing the crack profiles based on the composite-mode total focusing method (CTFM), including: selecting the parameters for phased array ultrasonic testing; acquiring the A-scan signal matrix; establishing the coordinate system and grid division of the region of interest (ROI); determining the wave modes; solving the positions of the refracted points; reconstructing the image by CTFM; and realizing the quantification, positioning, and orientation of cracks. The A-scan signal matrix including 21 views is acquired. Based on Fermat's principle, the refracted points at the interface between wedge and sample for the 21 views are calculated, to obtain the corresponding amplitude for each view in the ROI. For each reconstruction point, the strongest response is selected from the 21 views. The profiles of the cracks with different orientation angles are reconstructed by CTFM.

公开(公告)号：US12000141B2

公开(公告)日：2024-06-04

申请号：US17777862

申请日：2021-06-01

Applicant: DALIAN UNIVERSITY OF TECHNOLOGY

Inventor： Fuyou Xu ,  Weizhi Zhu ,  Bo Wang ,  Wenjie Li ,  Gao Liu

IPC: E04B1/98 ,  E01D19/00 ,  F16F15/067

CPC classification number: E04B1/98 ,  E01D19/00 ,  F16F15/067

Abstract: The present invention provides a semi-active vibration absorption and energy dissipation control system for restraining vortex-induced vibration of bridges. It has the advantages and characteristics that: (1) springs are horizontally placed at the bottom of a beam, and lengths are not limited, so that the frequency requirement of a low-frequency target can be satisfied; (2) different target frequencies can be realized through different combinations of a plurality of springs connected in series and in parallel, so that multi-order vortex-induced vibration control needs are satisfied; (3) the springs made of fiber reinforced nylon materials are adopted, and are notched, so that a frequency implementation range can be greatly widened; (4) the material and the form of a mass body are not limited, and a water bag can be used, which has low cost and is convenient for disassembly, assembly and mass adjustment.