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Now showing items 1 - 16 of 78

  • WOUND LIFTING WIRE ROPE IMPACT FRICTION TEST SYSTEM IN A KILOMETER-DEEP WELL

    A wound lifting wire rope impact friction test system in a kilometer-deep well, comprising: a frame (5), a roller (1) is disposed on the left end of the frame (5), and is mounted within a bearing block (8) above the frame (5) via a roller central shaft (9), the roller central shaft (9) is connected to a variable-speed motor (6) via a torque and rotational speed meter (7), a thrust oil cylinder (4) is horizontally disposed at the same height as the roller central shaft (9) on the right end of the frame (5), the thrust oil cylinder (4) and a friction wheel (2) are connected together via a pin, a centroid position of the friction wheel (2) is located at the same height as the thrust oil cylinder (4), two sides of the friction wheel (2) are fixed on a movable bearing (3), the movable bearing (3) is mounted on a guide rail (13) fixed on the frame, two wire ropes (10) are wound side by side on the roller (1), and one wire rope (12) is wound on the friction wheel (2). The system simulates a working condition of wound lifting wire rope impact friction test system in a kilometer-deep well, studies tribology property of the wire rope under different rotational speeds, accelerations, impact velocities, and contact pressures, and has a simple and compact structure, a low cost, and provides an easy method and effective results.
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  • FLOATING TYPE DISC BRAKE FOR KILOMETER-DEEP WELL ELEVATOR

    A floating type disc brake for a kilometer-deep well elevator. The floating type disc brake comprises a brake disc (3), a main disc body, an auxiliary disc body and a floating type structure. The main disc body comprises a mechanical brake unit and a state monitoring unit. The mechanical brake unit comprises a brake shoe B (6), a liner plate B (5), a pressing sleeve (4), a pressing plate (19), a screw (22), a brake cylinder barrel (10), a brake piston (21), a T-shaped piston (15), a disc spring assembly (11) and a cylinder cover (12). The state monitoring unit comprises a pressure sensor (17), a disc spring base sensor (13) and an eddy current sensor (30). The auxiliary disc body comprises a brake shoe A (2) and a liner plate A (1). The floating type structure comprises a sliding pin shaft (24), a spring (27) and a support (26). The brake can dynamically monitor a brake positive pressure and a gap between the brake shoes (6, 2) and the brake disc (3), the abrasion loss of the brake shoes (6, 2), and the fatigue break state of the disc spring assembly (11). Meanwhile, real-time automatic compensation for abrasion of the brake shoes (6, 2) and automatic alignment of the brake disc (3) can be achieved.
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  • Urban extent enhances extreme precipitation over the Pearl River Delta, China

    Wang, Dagang   Jiang, Peng   Wang, Guiling   Wang, Dashan  

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  • DETECTION DEVICE AND METHOD FOR IMPROVING LAYER-TO-LAYER TRANSITION OF STEEL WIRE ROPES

    Disclosed are a detection device and method for improving layer-to-layer transition of steel wire ropes. The detection device comprises a reel assembly, a steel wire rope tensioning assembly, a steel wire rope loading assembly and a lead screw sliding assembly. The reel assembly is used for winding steel wire ropes around a reel and can drive the reel to rotate. The reel assembly and the lead screw sliding assembly are installed on a bottom frame (1). The steel wire rope tensioning assembly is connected to the steel wire rope loading assembly via a threaded rod and a static torque sensor (28). The steel wire rope loading assembly is sleeved on vertical bare shaft guide rails (4) via a sliding block (9). The device can simulate friction and vibration activities between steel wire ropes at the multilayer winding layer-changing climbing stage of the steel wire ropes on a reel, and can measure the tensile forces of straight steel wire ropes and bent steel wire ropes, the twisting force of the straight steel wire ropes, and the friction forces and the vibration acceleration between wound steel wire ropes and the straight steel wire ropes and the bent steel wire ropes during layer-to-layer transition in real time.
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  • DISC BRAKE COOLED BY BOTH AIR AND WATER

    A disc brake cooled by both air and water comprises a brake disc (1) and a brake shoe (6). The brake disc (1) comprises a brake disc base (3). The brake disc base (3) comprises an inner side annular disc portion (3-1) and an outer side annular disc portion (3-2). A hub (2) is fixedly connected to the inner side annular disc portion (3-1). Two sides of the outer side annular disc portion (3-2) are both provided with multiple fan-shaped slots (3-3). One side of an asbestos-free friction plate (4) is provided with fan-shaped protrusions (4-1). The fan-shaped protrusions (4-1) are mounted in the fan-shaped slots (3-3). The inner side annular disc portion (3-1) is evenly provided with multiple axial through holes (3-4). The inner side annular disc portion (3-1) and the outer side annular disc portion (3-2) are provided with radial through holes (3-5). One end of the radial through hole (3-5) is in communication with the axial through hole (3-4), and the other end thereof is directly connected to an outer annular surface of the outer side annular disc portion (3-2). The brake shoe (6) is provided with multiple cooling water channels (6-1). During braking, heat absorbed by the brake shoe (6) is taken away by cooling water, and heat absorbed by the brake disc (1) is taken away by a heat dissipation passage formed by an axial air passage and a radial air passage, ensuring that the temperature of the brake disc (1) also remains low.
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  • Incorporating remote sensing-based ET estimates into the Community Land Model version 4.5

    Wang, Dagang   Wang, Guiling   Parr, Dana T.   Liao, Weilin   Xia, Youlong   Fu, Congsheng  

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  • STEEL WIRE ROPE INTERLAYER FRICTION DETECTION APPARATUS AND METHOD FOR WINDING-TYPE HOIST

    A steel wire rope interlayer friction detection apparatus and method for a winding-type hoist. The apparatus comprises a support, and a loading steel wire rope positioning system, a connector-free steel wire rope positioning system, a brake system, a power loading system and a state monitoring system, which are provided on the support. By means of a fixed pulley positioning apparatus and a loading manner of an electric pull rod (19) controlled by a computer, a stable steel wire rope contact load can be continuously applied, and a friction force, a temperature field and a friction coefficient between steel wire ropes and an expanding law of internal cracks inside the steel wire ropes are monitored in real time, such that an interlayer friction situation of the steel wire ropes on a roller of a winding-type hoist can be simulated, a frictional wear experiment between a loading steel wire rope (12) and a connector-free steel wire rope (27) on a rotary hub (01) is implemented, a steel wire rope frictional wear fracture mechanism is revealed, and the friction damage evolution of the steel wire ropes and the fatigue life of the steel wire ropes are evaluated.
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  • Tribo-fatigue behaviors of steel wire rope under bending fatigue with the variable tension

    Zhang, Jun   Wang, Dagang   Song, Daozhu   Zhang, Dekun   Zhang, Chunlei   Wang, Dao’ai   Araújo, José Alexander  

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  • Use of SMAP Soil Moisture and Fitting Methods in Improving GPM Estimation in Near Real Time

    Zhang, Zhi   Wang, Dagang   Wang, Guiling   Qiu, Jianxiu   Liao, Weilin  

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  • Dynamic friction transmission and creep characteristics between hoisting rope and friction lining

    Wang, Dagang   Zhang, Dekun   Mao, Xianbiao   Peng, Yuxing   Ge, Shirong  

    Highlights • Evolutions of slip states between the rope and friction lining were presented. • Roles of kinematic parameters on evolutions of slip states were explored. • Roles of effective load on evolutions of slip states were exhibited. • Evolutions of creep amplitude and creep velocity during hoisting were discussed. • Roles of kinematic and kinetic parameters on dynamic creep properties were studied. Abstract Dynamic friction transmission and creep characteristics between the rope and friction lining during deep coal mine hoisting were presented in this study. Rope tensions during lifting and lowering were obtained applying Simulink simulation models. Effects of the effective payload, maximum speed, acceleration and deceleration on dynamic friction transmission and creep properties were explored. The results show that increases of the effective load, maximum speed, acceleration and deceleration almost all induce expanding trends of overall ranges of the active slip angle, maximum creep amplitude and maximum creep velocity, respectively.
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  • Quantitative analyses of fretting fatigue damages of mine rope wires in different corrosive media

    Wang, Dagang   Zhang, Dekun   Zhao, Weijian   Ge, Shirong  

    Fretting fatigue damages of steel wires in coal mine in three corrosive media were quantitatively analyzed in the present study. Theoretical models of wear coefficient, energy dissipated by friction and fretting fatigue life prediction were established to quantitatively analyze roles of corrosive media on anti-wear properties, dissipated energy and fretting fatigue lives of steel wires, respectively. The results show that an increase of pH value of the corrosive media induces better anti-wear property of the steel wire, an increase at first and then a decrease in the average value of the stabilized dissipated energy, and larger fretting fatigue life of the steel wire. (C) 2013 Elsevier B.V. All rights reserved.
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  • Evaluation of TMPA 3B42V7, GPM IMERG and CMPA precipitation estimates in Guangdong Province, China

    Wang, Dashan   Wang, Xianwei   Liu, Lin   Wang, Dagang   Huang, Huabing   Pan, Cuilin  

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  • COMPREHENSIVE STEEL WIRE ROPE AND FRICTION LINER FRICTION DETECTION APPARATUS AND METHOD FOR HOIST

    A comprehensive steel wire rope and friction liner friction detection apparatus and method for a hoist. The apparatus comprises a base frame, and a steel wire rope and steel wire rope cross-contact continuous high-speed sliding friction system, a steel wire rope and steel wire rope cross-contact continuous creeping frictional wear system and a steel wire rope and friction liner continuous high-speed sliding friction system, which are disposed on a base (01) of the base frame. The present invention functionally breaks through the detection of the characteristics of frictions between steel wire ropes in a winding-type hoist and the characteristics of high-speed sliding frictions between the steel wire ropes and friction liners in the friction-type hoist, and three friction behaviors such as a steel wire rope and steel wire rope cross-contact high-speed sliding friction, a cross-contact creeping frictional wear and a steel wire rope and friction liner high-speed sliding friction can be simulated.
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  • Tribo-fatigue behaviors of steel wires under coupled tension-torsion in different environmental media

    Wang, Dagang   Song, Daozhu   Wang, Xiangru   Zhang, Dekun   Zhang, Chunlei   Wang, Dao’ai   Araújo, José Alexander  

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  • Urban heat island: Aerodynamics or imperviousness?

    Li, Dan   Liao, Weilin   Rigden, Angela J.   Liu, Xiaoping   Wang, Dagang   Malyshev, Sergey   Shevliakova, Elena  

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  • RELIABILITY ASSESSMENT METHOD FOR MAIN SHAFT OF KILOMETER-DEEP WELL ELEVATOR UNDER MULTIPLE FAILURE MODES

    The present invention discloses a reliability assessment method for a main shaft of a kilometer-deep well elevator taking multiple failure modes into account. Firstly, a parameterized three-dimensional model of the main shaft is established according to the structure and size of the main shaft; secondly, a sampling matrix of a random variable of the main shaft is established according to a probability attribute of the random variable, and the finite element method is used to solve intensity and rigidity responses of the main shaft under the sampling matrix; further, an explicit function between the responses and the random variable matrix is established by using a neural network method, wherein explicit performance functions are respectively established under intensity failure and rigidity failure modes according to the intensity and rigidity design criteria; subsequently, two types of failure probabilities are calculated by using the saddle point approximation method; and finally, a joint failure probability model between the two failure modes is constructed by means of the Clayton copula function, and the interval reliability method is used to solve for system reliability in a joint failure state. The method takes probability correlation between intensity failures and rigidity failures into account and can be used to more accurately and reasonably assess system reliability of an elevator main shaft.
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