公开(公告)号：US20210090326A1

公开(公告)日：2021-03-25

申请号：US16862878

申请日：2020-04-30

Applicant: CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Huanan YU ,  Shunjun LI ,  Guoping QIAN ,  Xiangbing GONG ,  Xuan ZHU

IPC: G06T17/00

Abstract: A modeling method for an asphalt mixture by coupling a discrete element method (DEM) and a finite difference method (FDM). Aggregates of an asphalt mixture are processed by a DEM, and a finite difference method is used to implement continuous medium simulation of an asphalt binder in the asphalt mixture. The influence of the coupling of the DEM and the finite difference method on mechanical properties of the asphalt mixture such as the strength and modulus are considered, to implement simulation of the deformation, shrinkage, cracking, etc. of a multiphase material in the asphalt mixture under different load. The method can accurately restore a void structure and true shapes and sizes of the aggregates and a binder in the asphalt mixture, and can characterize distribution characteristics thereof.

公开(公告)号：US20210087759A1

公开(公告)日：2021-03-25

申请号：US16861975

申请日：2020-04-29

Applicant: Changsha University of Science and Technology

Inventor： Guoping Qian ,  Huanan Yu ,  Changyun Shi ,  Xiangbing Gong ,  Xi Li ,  Jun Cai ,  Wenchao Wu

IPC: E01C23/01 ,  G01N33/42

Abstract: A device is for detecting compaction and shear strength characteristics of an asphalt mixture during construction compaction. The device includes a fixed frame and a detection system. The detection system includes a display, a control panel, a test claw, an electric motor, a lift switch, a torque sensor and a temperature sensor. The control panel includes a power switch for controlling the electric motor and a speed regulator for controlling a rotation speed of the test claw. An output end of the electric motor is connected to an input end of the torque sensor, and an output end of the torque sensor is connected to an input end of the test claw. An output end of the test claw is provided with a claw-shaped blade. The claw-shaped blade is provided therein with the temperature sensor.

公开(公告)号：US20210045265A1

公开(公告)日：2021-02-11

申请号：US16942519

申请日：2020-07-29

Applicant: CHANGSHA UNIVERSITY OF SCIENCE and TECHNOLOGY

Inventor： Xiaoqin Sun ,  Jie Li ,  Shuguang Liao

IPC: H05K7/20 ,  F25B25/00

Abstract: A computer room heat-pipe air conditioning system with an emergency cooling control method. The system comprises a phase-change energy storage module, a phase-change material packaging body, a condenser housing, a condenser, a cold releasing pump, evaporators, evaporation fans, four three-way valves, a cooling unit, standby power generators and storage batteries. The three-way valves are opened and closed based on a preset heat-pipe cooling criteria in combination with phase-change energy storage technology.

公开(公告)号：US10892616B2

公开(公告)日：2021-01-12

申请号：US16613409

申请日：2018-07-04

Applicant: CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY

Inventor： Xiangjun Zeng

IPC: H02H9/08 ,  H02H9/00

Abstract: The proposed invention discloses a safe processing method for active voltage reduction of a ground fault phase of a non-effective ground system, for use in safe processing of a ground fault of a neutral point non-effective ground generator or distribution network. Non-effective ground system side windings of a transformer are equipped with a plurality of shunting taps. When a single-phase ground fault occurs, the shunting tap of the fault phase winding is selected to be short-circuited to ground directly or through an impedance to reduce the fault phase voltage to ensure that the fault point voltage is less than the continuous burning voltage of a ground arc to meet a long-term non-stop safe operation requirements. The proposed method can eliminate the instantaneous single-phase ground fault, suppress the permanent single-phase ground fault current, and limit the rising amplitude of non-fault phase voltage and the risk of non-fault phase insulation breakdown.