Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control

Taiyuan, China

Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control

Taiyuan, China
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Liu X.,Taiyuan University of Technology | Liu X.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Gao G.,Taiyuan University of Technology | Gao G.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control
Zhenkong Kexue yu Jishu Xuebao/Journal of Vacuum Science and Technology | Year: 2016

Here, we experimentally addressed the atomization characteristics of the ultrasonic nozzle, modified with a thin rod inserted through the axis of its Hartmann whistle. The impact of the inserted rod and compressed air-pressure on the key variables, including Sauter mean diameter (SMD), atomization angle and water consumption, was investigated with laser particle size analyzer. The results show that the inserted rod and pressure have a major impact on the spraying characteristics. To be specific, as the pressure increased in a range below 0.5 MPa, SMD dramatically decreased and the atomization angle rapidly increased; and a pressure of 0.5 MPa optimized and stabilized the atomization, maximized the atomization angle, and minimized SMD and water consumption. The central rod significantly reduced the droplet size. For example, at a pressure higher than 0.4 MPa, the rod decreased SMD by 3 μm, with the smallest droplet being 12 μm. © 2016, Science Press. All right reserved.


Li J.,Taiyuan University of Technology | Li J.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Pang X.,Henan University of Science and Technology | Fan A.,Taiyuan University of Technology | Zhang H.,Taiyuan University of Technology
Journal Wuhan University of Technology, Materials Science Edition | Year: 2017

Ti/Cu/N coatings with different Cu contents were deposited on titanium alloy surface by the DC magnetron sputtering technique. XPS and FESEM were employed to characterize the composition and structure of the coating on the Ti6Al4V substrates. In addition, The adhesion force, friction, and wear properties of the Ti/Cu/N coatings were investigated. The experimental results showed that the coarse particles of the coatings would grow more and the surface roughness increased with the increase of copper content in the coatings; The coatings showed a strong adhesion force; The friction coefficient of the coating of the samples was less than the substrate, reaching 0.19 at least. The wear resistance of the coatings could be improved by optimizing and controlling the relative content of Ti, Cu, N elements on the titanium alloy surface, especially the 10.98 at% contents of the copper. The sample C2 kept the best wear resistance. © 2017, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.


Zhang J.,Taiyuan University of Technology | Guo H.-W.,Harbin Institute of Technology | Liu R.-Q.,Harbin Institute of Technology | Wu J.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | And 2 more authors.
Acta Astronautica | Year: 2016

The impact and elasticity of discontinuous beams with clearance frequently affect the dynamic response of structures used in space missions. This study investigates the dynamic response of jointed beams which are the periodic units of deployable structures. The vibration process of jointed beams includes free-play and impact stages. A method for the dynamic analysis of jointed beams with clearance is proposed based on mode superposition and instantaneous static deformation. Transfer matrix, which expresses the relationship of the responses before and after the impact of jointed beams, is derived to calculate the response of the jointed beams after a critical position. The dynamic responses of jointed beams are then simulated. The effects of various parameters on the displacement and velocity of beams are investigated. © 2016 IAA


Zhang J.,Taiyuan University of Technology | Guo H.-W.,Harbin Institute of Technology | Liu R.-Q.,Harbin Institute of Technology | Wu J.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | And 2 more authors.
Nonlinear Dynamics | Year: 2015

Both the friction caused by the preload in locked joints and the impact caused by clearance in unlocked joints cause energy dissipation in jointed deployable structures. The energy dissipation of locked joints is studied by analyzing the force on the infinitesimal body of the joint. The jointed beam with an unlocked joint is simplified into an impact mass-spring model with clearance, which considers the coefficient of restitution of impact. The energy dissipations of the joint caused by friction and clearance are transformed into damping ratios by Taylor expansion. Then, the effects of pressure, clearance and the dynamic parameters on the damping of joints are analyzed by utilizing the damping ratio formulation. The damping ratio increases with the preload and the clearance. To validate the damping ratio formulation of joints, experiments on a single jointed beam with preload and double jointed beams with clearance are conducted. Comparison between the experimental results and the model simulation results shows that the friction and impact damping models are accurate for the dynamic calculation of deployable structures. Furthermore, the damping ratio formulations can be directly introduced into the design and dynamic analysis of deployable structures. © 2015, Springer Science+Business Media Dordrecht.


Liu Q.,Taiyuan University of Technology | Liu Q.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Kou Z.,Taiyuan University of Technology | Kou Z.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | And 4 more authors.
Experimental Thermal and Fluid Science | Year: 2015

A shear-impact-type atomized dust controller was designed by combining the rotary spray blades and axial flow fan, and the droplet atomizing process included two steps: shear-atomizing and impact-atomizing. The comprehensive operating parameters of this dust controller were studied by measuring different droplet size, airflow velocity, water consumption, nebulization efficiency, and collecting efficiency under different rotating speed, diversion hole-exit diameter, and colliding tooth angle. The relationships among them have been particularly analyzed. Results indicated that the droplet size is greatly influenced by rotating speed; the airflow velocity enhances monotonously with the increase in rotating speed. Excessive rotating speed and diversion hole-exit diameter can cause water waste, and suitable colliding tooth angle θ can improve nebulization efficiency. The optimal operating conditions were obtained with rotating speed 1500-2100. r/min, diversion hole-exit diameter 2-2.5. mm and colliding tooth angle 35-40° by fully considering security, water consumption, nebulization and collecting efficiencies. In this case, the nebulization efficiency exceeds 96.3% and the collecting efficiency tops 98.6%. © 2015 Elsevier Inc.


Cui G.,Taiyuan University of Technology | Cui G.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Lu L.,Taiyuan University of Technology | Wu J.,Taiyuan University of Technology | And 2 more authors.
Journal of Alloys and Compounds | Year: 2014

A series of Fe-Cr matrix high temperature self-lubricating composites were prepared by powder metallurgy technique (PM). The tribological properties of composites sliding against ceramic Si3N4 ball were studied by using a ball-on-disc high-temperature tribometer at 10 N and 0.19 m/s for 20 min from room temperature to 800 °C. Mo element showed an obvious solid solution strengthening effect on the matrix, and formed the high temperature solid lubricant BaMoO4. The obtained results showed that the tribological properties of specimens greatly depended on the additives. Generally speaking, the specimen containing 8.0 wt.% BaF2, 10.0 wt.% Ag and 8.5 wt.% Mo kept the lowest friction coefficient (0.4) and specific wear rate (1.8-3.7 × 10-4 mm3 N-1 m -1) from room temperature to 800 °C. The high-temperature tribological properties of Fe-Cr based alloy were improved due to the addition of additives. The excellent tribological behavior of specimen was attributed to the synergetic action of solid lubricants and high hardness. The wear mechanism of specimen FM is ploughing and slightly delamination at room temperature and 400 °C. At 800 °C, the specimen FM shows the micro-ploughing characteristics. © 2014 Elsevier B.V. All rights reserved.


Cui G.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Kou Z.,Taiyuan University of Technology
Journal of Alloys and Compounds | Year: 2014

Bulks of Fe-Cr-B alloys were prepared by using powder metallurgy technology route (P/M), and the microstructure and mechanical properties of iron matrix alloys were investigated in detail. The boron was an effective strengthened element to reinforce mechanical properties of alloys. The Fe-Cr-B alloys were composed of Fe, FeCr and Fe2B phases. Fe phase was rounded by alloy phases in the matrix. The Fe-Cr matrix alloys transferred from the ductile material to the brittle material with the increase of boron content, which showed high hardness in comparison with that of Fe-Cr alloy due to the formation of intermetallic compounds. The specimen containing 7 wt.% boron showed the best properties. The fracture mode of alloys transferred from transgranular cleavage fracture to the intergranular cleavage fracture. © 2013 Elsevier B.V. All rights reserved.


Wu J.,Taiyuan University of Technology | Wu J.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Cui G.,Taiyuan University of Technology | Cui G.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | And 4 more authors.
Tribology Transactions | Year: 2015

The tribological behaviors of Fe-Cr-B alloy and AISI52100 and AISI304 stainless steel sliding against an AISI52100 steel ball were investigated with a ball-on-disk tribotester under distilled water condition. The Fe-Cr-B alloy was successfully prepared by using powder metallurgy technology. In distilled water, the friction coefficient and specific wear rate of Fe-Cr-B alloy were the lowest compared to other specimens. The different alloys showed different wear mechanisms during the sliding process. The wear mechanism of AISI52100 steel was ploughing and severe plastic deformation; the wear mechanism of AISI304 stainless steel was ploughing and plastic deformation. However, Fe-Cr-B alloy was dominated by microploughs and slight delamination under distilled water condition. The Fe-Cr-B alloy showed better wear resistance than that of the other two alloys. © 2015, Copyright © Society of Tribologists and Lubrication Engineers.


Wu J.,Taiyuan University of Technology | Wu J.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Kou Z.-M.,Taiyuan University of Technology | Kou Z.-M.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | And 4 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2014

The space curve of double helical wire for the right lang lay rope was deduced based on the space curve of single helical wire by Frenet-Serret frame. A realistic three-dimensional modeling approach and finite element analysis of ropes with 14 mm diameter were developed and two cables with different lay directions were modeled. The finite element analyses of two ropes were conducted based on Augmented-Lagrangian algorithm and the corresponding contact parameters. The results show the variation regularity of equivalent stresses and deformations of two ropes. The lay direction and spatial position of double helical wires have a great influence on the equivalent stresses and deformations of wires. In the two ropes, the equivalent stresses of double helical wires are not homogeneous. The double helical wires'stress has a great relationship with the spatial position of wires. The zone of maximum equivalent stresses is the zone of curvature change. The distribution of deformations in the right lang lay rope is analogous to that of the regular lay rope. The distributions of wires'deformations in each layer are sine or cosine distributions. In two ropes, the deformations of wire near to the core strand are larger than that of strand central wire, and the deformations of wires far away from the core strand are smaller than that of strand central wire. The equivalent stresses and deformations of the right lang lay rope are higher than those of the right regular lay rope. The results of present finite element analysis are valid in comparison with those of experimental data.


Wu J.,Taiyuan University of Technology | Wu J.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | Kou Z.-M.,Taiyuan University of Technology | Kou Z.-M.,Shanxi Provincial Engineering Laboratory Research Center for Mine Fluid Control | And 4 more authors.
Meitan Xuebao/Journal of the China Coal Society | Year: 2015

According to the relationship between the characteristics and winding state of the bending right regular lay rope, the space curve of single helical wire for the bending wire rope was established. Based on the theory of differential geometry, the Frenet-Serret frame was built and the space curve of double helical wire for the right regular lay rope was deduced. Two finite element models for the 12-6×7IWRC right lang lay and right ordinary lay rope were established. The boundary conditions were set through restricting the degree of freedom in three directions at one end of wire rope and loading the mass force at the other end. The distribution of equivalent stress and deformation of two models were compared. The study results show that the amplitude of equivalent stress for the right regular lay rope is greater than that of the right lang lay rope and the deformation of the right lang lay rope is greater than that of the right regular lay rope. The tensile tests for the right regular lay rope were conducted. Compared the deformations of the ropes obtained by the present finite element analysis with those obtained experimentally and theoretical value by Costello theory, the valve of maximum errors is 10%, which suggests that the models are valid. ©, 2015, China Coal Society. All right reserved.

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