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  • 1
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    Load and wear experiments on the impact hammer of a vertical shaft impact crusher (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-12-11
    Description: Impact hammers are important components of impact crushers, and are often shortlived due to the high-impact nature of their use. Wear-resistant alloys are welded to the surface of impact hammers to prolong their service life. In this paper, a simulation model of the rotor and impact hammers in impact crushers was designed to utilize the Discrete Element Method (DEM). The wear-resistant alloy on each impact hammer was divided into twenty-two action regions. The load distribution on each alloy block is affected by the structural and manufacturing parameters of the impact crusher. The wear distribution of the impact hammer was measured by shape morphology according to relative impact crushers. The results demonstrated that the real measurements of wear distribution on the impact hammer were similar to simulated load distribution measurements on the same surface. The study of load distribution of impact hammers by DEM established a theoretical foundation on which to base the optimal ...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 2
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    Optimal the Process Variables of Internal Grinding for Shrink Fit Tool Holder (2017)
    Institute of Physics (IOP)
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    Publication Date: 2017-12-22
    Description: The goal of this study was to investigate the optimal variables settings in internal grinding for shrink fit tool holder. The effects of the main grinding variables on finishing responses were comprehensively investigated based on Taguchi method. The main process variables such as abrasive grain size (AGS), grinding wheel speed (GWS), feed rate for rough (FRR), depth for rough (DR), feed rate for finishing (FRF), depth for finishing (DF), dressing speed (DS), and workpiece rotational speed (WRS) were chosen to determine their effects on grinding performances related to roundness and surface roughness in the internal grinding of the shrink fit tool holder. The experimental response values were transferred to signal-to-noise (S/N) ratios, and then the significant process variables associated with the grinding performance were examined by analysis of variance (ANOVA). In addition, the optimal combination levels of the grinding variables were also obtained from the response graphs o...
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 3
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    Influence of process parameters to composite interface organization and performance of liquid/solid bimetal (2015)
    Institute of Physics (IOP)
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    Publication Date: 2015-12-11
    Description: The liquid-solid composite technique was used to prepare the high carbon high chromium steel (HCHCS) and low alloy steel (LCS) bimetal composite materials by means of insert casting method. The influence of some process parameters such as liquid-solid ratio, preheat temperature, pouring temperature on the interface microstructure and mechanical properties were studied. Interface microstructure and element distribution were analyzed. The results show that the interface microstructure becomes better, and bonding area becomes thicker with the increase of the volume of liquid to solid ratio, preheating temperature and pouring temperature. When the liquid-solid ratio is 8:1, the preheating temperature is 300 °C and the pouring temperature is 1565 °C, a good metallurgical bonding area without any hole can be obtained with the interface combination of diffusion and fusion. The composite interface structure was composed of a core material diffusion layer, a cooling solidification layer, ...
    Print ISSN: 1757-8981
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 4
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    Phenological characteristics of the main vegetation types on the Tibetan Plateau based on vegetation and water indices (2014)
    Institute of Physics (IOP)
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    Publication Date: 2014-03-20
    Description: Plant phenology is considered one of the most sensitive and easily observable natural indicators of climate change, though few studies have focused on the heterogeneities of phenology across the different vegetation types. In this study, we tried to find the phenological characteristics of the main vegetation types on the Tibetan Plateau. MCD12Q1 images over the Tibetan Plateau from 2001 to 2010 were used to extract the main vegetation types. The Normalized Difference Vegetation Index (NDVI), Enhanced Vegetation Index (EVI), and Land Surface Water Index (LSWI) were calculated using surface reflectance values from the blue, red, near-infrared, short-wave infrared (SWIR) 6 (for LSIW6), and SWIR7 (for LSIW7) bands derived from MOD09A1 and used to explore the phenological characteristics of the main vegetation types on the Tibetan Plateau. The results showed that there were eight constant vegetation types on the Tibetan Plateau from 2001 to 2010 demonstrating multiple phenological c...
    Print ISSN: 1755-1307
    Electronic ISSN: 1755-1315
    Topics: Geography , Geosciences , Physics
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  • 5
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    Degradation of methyl orange using FeVO 4 : Cu 2+ as photocatalyst (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-09-01
    Description: Nanosize Cu-doped FeVO 4 was prepared by microwave-assisted method and was used as photocatalyst in the degradation of simulated wastewater like methyl orange. The effects of light intensity, amounts of H 2 O 2 and FeVO 4 :Cu 2+ on the degradation efficiency were studied. The result showed that under the optimized conditions, with an 800w xenon lamp, 0.09g of FeVO 4 :Cu 2+ and 0.3mL of 3%H 2 O 2 , the degradation rate of methyl orange (30mL, 10mg/L) reached 94% after 180 min of viable light irradiation.
    Print ISSN: 1757-8981
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 6
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    Effects of Contour Plowing by Rotary Cultivator on Vertical Redistribution of Soil Organic Carbon (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-12-20
    Description: Simulated tillage and magnetic tracing techniques were applied to study the effects of contour plowing by rotary cultivator on vertical migration of soil organic carbon (SOC) on a steep hillslope in purple soil, revealing the relationship between SOC vertical and downslope movements. Contour plowing by rotary cultivator played an important role on downslope transfers of the soil, resulting in an obvious transformation of soil profiles with tillage depth at the summit position. The depth distribution of soil magnetic susceptibility showed that tillage brought about the vertical downward migration of the soil magnetic tracer. The intense tillage led to the vertically downward transfer of SOC, but vertical redistribution patterns differed from one another at different slope positions. Due to upward migration of parent rock debris and downslope transport of soil, SOC concentrations in the surface soil layer (0-10 cm) was reduced significantly at the summit position. For the backslop...
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    Topics: Geography , Geosciences , Physics
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  • 7
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    Nonlinear Dynamics Behaviors of a Composite Laminated Cantilevered Plate Under Transverse Excitation (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-08
    Description: The nonlinear dynamics analyses of a composite laminated cantilevered rectangular plate are studied, which is forced by the transverse excitation. We use the Hamilton’s principle and establish the nonlinear partial differential governing equations of motion for the composite laminated cantilevered rectangular plate. Numerical simulations are presented to investigate the effects of the transverse excitation on the steady-state responses of the cantilevered plate. The bifurcation diagrams of the composite laminated cantilevered plate for w 1 via the base excitation amplitude F is obtained. From the bifurcation diagram, it is found that the motions of the system are as follows: from periodic motion to multiple periodic motion, then to chaotic motion. Based on the above bifurcation diagrams and using the same parameters, the base excitation amplitude F are changed to obtain the waveforms, the two-dimensional phase portraits, the three-dimensional phas...
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    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 8
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    The Nonlinear Properties of a Piezoelectric Cantilevered Plate under Parametric Excitation (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-08
    Description: In this paper, we investigate the nonlinear dynamics characteristics of the composite piezoelectric cantilevered plate forced under parametric excitation. Based on the Reddy’s classic deformation plate theory and the von Karman nonlinear strain–displacement equations, we deduce the nonlinear partial differential equations by applying the Hamilton’s principle. Then the dimensionless ordinary differential equations of the system with three-degree-of-freedom are derived. We choose a set of parameters of governing equation and employ numerical simulations to investigate the effects of parametric excitation on the nonlinear responses of the system. The results indicate that there exist the periodic and chaotic motions.
    Print ISSN: 1757-8981
    Electronic ISSN: 1757-899X
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
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  • 9
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    Design and experimental study on thermal characteristics of thermal storage flat-plate solar collector (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-10-31
    Description: A thermal storage flat-plate solar collector is designed to improve working stability of the solar air drying system, which consists of an absorber plate, a transparent cover plate, a heat insulation layer, phase change materials, a tube bank and a shell, etc. The daily thermal characteristics of thermal storage flat-plate air collector system were tested under natural conditions. The results show that heat storage flat-plate solar collector can effectively extend collector heating time, with daily heat efficiency reaching 49.8%, which is 4.6% up as compared to 45.21% of non-thermal storage heat collector.
    Print ISSN: 1755-1307
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    Topics: Geography , Geosciences , Physics
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  • 10
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    Simulating-optimizing coupled method for pumping well layout at a nitrate-polluted groundwater site (2018)
    Institute of Physics (IOP)
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    Publication Date: 2018-11-06
    Description: The unreasonable pumping scheme of the pump-treat technology can lead to high repair cost and poor performance in contaminated groundwater remediation. In order to improve the cost effectiveness of the technology, we took a heavily nitrate-polluted informal domestic waste landfill site in North China as an example, and optimized the pumping scheme using Visual MODFlOW software combined with genetic algorithm (GA) in MGO module. By designing the constant pumping rate scheme and phased pumping rate scheme, optimal layout of pumping wells were determined with the minimum total pumping capacity as the optimal target. The result showed that the two wells which located near the central axis and in the middle and lower reaches of the plume with a constant pumping rate of 13.2 m 3 /d and continuous pumping for 75 days was the optimal pumping solution in constant pumping rate scheme. While the pump schedule as Q 1 = 19.8 m 3 /d, Q 2 =...
    Print ISSN: 1755-1307
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    Topics: Geography , Geosciences , Physics
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