公开(公告)号：US20220178790A1

公开(公告)日：2022-06-09

申请号：US17677017

申请日：2022-02-22

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Shuyi YANG ,  Lili LIAO ,  Lingyun QIN ,  Shixiong TANG ,  Dong AO ,  Juchuan DAI ,  Qihui LING ,  Yong GUO ,  Zhewu CHEN ,  Hongzhou LI

IPC: G01M17/04

Abstract: A system for integratedly testing damping performance of a hydro-pneumatic suspension vehicle, including a testing platform and a testing device. The testing device includes a sensor module, a data acquiring and processing module and a testing software. A method for integratedly testing damping performance of a hydro-pneumatic suspension vehicle is also provided. A calculation is performed by a testing software to optimize a sensor configuration. A signal is acquired and transmitted by the sensor module. The signal is acquired and processed by a data acquiring and processing module, and displayed and analyzed by the testing software.

公开(公告)号：US11264933B2

公开(公告)日：2022-03-01

申请号：US17163980

申请日：2021-02-01

Applicant: Hunan University of Science and Technology

Inventor： Xiaoping Zhang ,  Sijian Kuang ,  Ping Liu ,  Zhu Zhang ,  Haipeng Jiang ,  Shaowu Zhou

IPC: H02P25/089

Abstract: A sensorless control method and an apparatus for a three-phase switched reluctance motor. The sensorless control method obtains line inductances of three phases according to real-time phase inductances of the three-phase switched reluctance motor and then determines feature points of the line inductances of the three phases. A position angle of the rotor at any time in the next corresponding region is calculated according to an average rotation speed of the rotor in the region corresponding to two adjacent feature points. A control signal is output to realize a precise sensorless control for the three-phase switched reluctance motor. The control apparatus includes a microcontroller, a power conversion circuit, a drive module for the power conversion circuit, a current detection module, a voltage detection module, an input and output module and a direct current regulated power supply.

公开(公告)号：US20220010640A1

公开(公告)日：2022-01-13

申请号：US17485861

申请日：2021-09-27

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Buyan WAN ,  Yongping JIN ,  Fenfei PENG ,  Jialiang WANG ,  Huan LIU

IPC: E21B25/08 ,  E21B25/16 ,  E21B25/02

Abstract: A long-distance core drilling method suitable for a horizontal geological core drilling rig. (1) An active drill rod is connected to a drill rod, which is connected to a wireline-coring outer-tube drilling tool. (2) A steel-pipe string is connected to a fishing device, and the fishing device is connected to a spearhead on a core tube, which is placed to a designated position through a pipe-feeding mechanism. (3) A washing pump is started. (4) A core drilling is carried out. (5) A core is pulled out. (6) The steel-pipe string and the fishing device are reconnected. (7) The core tube is salvaged. (8) The core tube and drill pipe are replaced. (9) A hole is swept. (10) Steps (1)-(9) are repeated until the hole is drilled to a designated depth. (11) The core tube and the wireline-coring outer-tube drilling tool are recovered.

公开(公告)号：US11201542B2

公开(公告)日：2021-12-14

申请号：US17096766

申请日：2020-11-12

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaoping Zhang ,  Ruirui Zhang ,  Zhi Wu

IPC: H02M3/156

Abstract: Disclosed a method for determining a stability range of control parameters of a Buck-Boost converter based on segmented delay feedback control, including by taking inductor current and capacitor current in a Buck-Boost converter as state variables, establishing state differential equations respectively for two different level states of the converter under the pulse input voltage; based on different input voltages, correcting inductor reference current to obtain novel inductor reference current; based on the state differential equations and the novel inductor reference current, obtaining a discrete iteration mapping model of a system; based on the discrete iteration mapping model, obtaining function equations corresponding to an upper limit and a lower limit of control parameters of the converter when the segmented delay feedback control is used to realize the stable operation of the system under the pulse input voltage, and determining a stability range of the corresponding control parameters by the function equations.

公开(公告)号：US10988898B2

公开(公告)日：2021-04-27

申请号：US16009181

申请日：2018-06-14

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Hu Zhou ,  Zhiling Qi ,  Dongdong Wang ,  Zhihua Zhou ,  Xuan Liu ,  Qingquan Liu ,  Xiaohong Wang

IPC: D21H17/63 ,  D21H27/00 ,  D21H17/57 ,  D21H25/06 ,  D21H13/50 ,  D21H21/52 ,  C08L75/06 ,  C08L75/08 ,  C08J3/21 ,  C08J5/18 ,  C08K3/04 ,  C08K7/24

Abstract: A method for preparing active carbon-based special synthetic paper capable of degrading harmful substances in environment, including: stirring polyurethane particles and a solvent in a reactor, and standing to completely dissolve the polyurethane particles to obtain a polyurethane solution; adding active carbon having harmful substances adsorption property in the obtained polyurethane solution, stirring and mixing uniformly to obtain a solid-liquid mixture; coating the obtained solid-liquid mixture onto a piece of release paper, soaking the release paper coated with the solid-liquid mixture into an aqueous solution of silver nitrate having photocatalytic degradation property, completely curing the solid-liquid mixture to form a film, and soaking the release paper and the film into an aqueous solution of sodium chloride; drying the obtained release paper and the film in an electric blast drying oven, and stripping the film from the release paper to obtain the active carbon-based special synthetic paper.

公开(公告)号：US10915692B2

公开(公告)日：2021-02-09

申请号：US16909825

申请日：2020-06-23

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaoping Zhang ,  Ji Liu ,  Ruirui Zhang

IPC: G06F30/00 ,  G06F30/398 ,  G06F30/20 ,  G06F111/06 ,  G06F111/10

Abstract: Taking parameters of a main circuit in a BBMC as optimization objects, and a total harmonic distortion of an output voltage of the BBMC, a deviation between an actual output current and a corresponding rated output current as optimization objectives, a mathematical model between optimization objects and optimization objectives is established. A multi-objective optimization satisfaction function and a multi-objective optimization fitness function are established by selecting a current rating as a rated output current of the BBMC. An adaptive wolf pack optimization algorithm is adopted to obtain a set of optimal parameters of the main circuit. The rated output current is changed to obtain n sets of optimal parameters, and functional relationships between the optimal parameters of the main circuit in the BBMC are obtained using a numerical fitting method. Optimal parameters of the main circuit corresponding to different current ratings are determined according to the functional relationships.

公开(公告)号：US20200380196A1

公开(公告)日：2020-12-03

申请号：US16909825

申请日：2020-06-23

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaoping ZHANG ,  Ji LIU ,  Ruirui ZHANG

IPC: G06F30/398

Abstract: Taking parameters of a main circuit in a BBMC as optimization objects, and a total harmonic distortion of an output voltage of the BBMC, a deviation between an actual output current and a corresponding rated output current as optimization objectives, a mathematical model between optimization objects and optimization objectives is established. A multi-objective optimization satisfaction function and a multi-objective optimization fitness function are established by selecting a current rating as a rated output current of the BBMC. An adaptive wolf pack optimization algorithm is adopted to obtain a set of optimal parameters of the main circuit. The rated output current is changed to obtain n sets of optimal parameters, and functional relationships between the optimal parameters of the main circuit in the BBMC are obtained using a numerical fitting method. Optimal parameters of the main circuit corresponding to different current ratings are determined according to the functional relationships.

公开(公告)号：US10804830B1

公开(公告)日：2020-10-13

申请号：US16926369

申请日：2020-07-10

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaoping Zhang ,  Ji Liu ,  Ruirui Zhang

IPC: H02P27/04 ,  H02P21/13 ,  H02P27/12

Abstract: An actual rotation speed of the asynchronous motor is detected according to the given rotation speed thereof. A given voltage of the asynchronous motor is obtained according to a vector control algorithm and a PI-IP control algorithm and is used as a reference output voltage of the BBMC. A duty cycle of a power switch tube in the BBMC is obtained according to a finite-time control algorithm by taking capacitor voltages and inductor currents in the BBMC as control variables of the speed regulation system. The conducting time of the power switch tube in the BBMC is controlled according to the duty cycle and an output control signal of a corresponding switching cycle, so that an output voltage consistent with its reference output voltage is obtained at an output end of the BBMC, so that the actual rotation speed of the asynchronous motor accurately tracks the given speed.

公开(公告)号：US20200320234A1

公开(公告)日：2020-10-08

申请号：US16909753

申请日：2020-06-23

Applicant: HUNAN UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiaoping ZHANG ,  Ji LIU

IPC: G06F30/20 ,  G05B13/04 ,  H02M3/158

Abstract: A mathematical model between the optimization objects and the optimization objectives is established, with finite-time control parameters as optimization objects, and a total harmonic distortion of an output voltage, a deviation signal of a capacitor voltage and a deviation signal of an output current of BBMC as optimization objectives. A multi-objective optimization satisfaction function and a multi-objective optimization fitness function are established. Multiple sets of optimal finite-time control parameters are iteratively optimized using an adaptive wolf pack algorithm. Functional relationships between respective optimal finite-time control parameters and the corresponding actual output current of BBMC are obtained using a numerical fitting method. Optimal control parameters corresponding to any load are obtained according to the obtained functional relationships. Therefore, the control parameters are adjusted in real time according to the functional relationships and the load of the BBMC-based speed regulation system or the actual output current of BBMC.

公开(公告)号：US20200131875A1

公开(公告)日：2020-04-30

申请号：US16731068

申请日：2019-12-31

Applicant: Hunan University of Science and Technology

Inventor： Buyan WAN ,  Yongping JIN ,  Xiaojun HUANG ,  Jialiang WANG

IPC: E21B25/06 ,  E21B25/18

Abstract: Disclosed is a process for drilling natural gas hydrates with a submersible core drilling rig using pressure wireline, including: 1) placing the drilling rig in seawater; 2) adopting a suction-press core drilling mode in a soft sediment formation, a suction-rotary core drilling mode in a medium-hard sediment formation, or a pumping direct circle-rotary core drilling mode in a hard sediment formation; 3) extracting a core; 4) recovering an inner tube for wireline pressure coring; 5) tightening a holding seal cap and storing the inner tube in a pipe storage rack; 6) punching; 7) capturing an inner tube for wireline pressure coring which is hollow and disengaging the holding seal cap; 8) lowering the inner tube; 9) adding a drill rod; 10) punching; 11) repeating steps (2˜10) till the core drilling reaches a given drilling depth; 12) recovering the drill rod and the drill; 13) recovering the corer.