Applied Mechanics and Materials Vol. 389

Abstract: According to correlation between the equipment of CCWS, this paper uses Copula to describe correlation of the system, establishes the reliability prediction model of CCWS and does the quantitative calculation. Analysing the results shows that the reliability of redundancy system is much higher than that of single component, but dependent failures between the equipment decrease the reliability of system. And also shows that this model can be perfectly used in the reliability prediction of CCWS. CLC number: TL364⁺.1 Document id code: A

Abstract: Calcium carbide Slag is one kind of industrial wastes from CaC₂ hydrolysis reaction that will cause land pollution. In the research, calcium carbide Slag used as a substitute for limestone to produce cement clinker, which with a high portion of CaO content and then an excellent calcium containing raw material. As a kind of industrial wastes, the properties of Calcium carbide slag differentiate from that of natural limestone. The formation process of clinker minerals was studied by means of XRD. The results indicated that clinker minerals formation is similar to that from use of limestone. The generated clinker has a rational mineral composition and well developed mineral phase structure. But, there are many differences in decomposition temperatures between the calcium containing raw materials. Therefore, the carbide slag can be used as a substitute of limestone raw material to produce cement clinker.

Abstract: In this paper, strong intensity magnetic flotation-acid leaching was used to separate feldspar, mica and quartz. And after the mixed acid leaching, the final quartz concentrate flotation was gained. After the sorting process of magnetic-flotation-acid leaching, the quartz concentrate was 99.19%, and the iron content was 0.016%. The quartz product quality meet the quality standards of the national concentrates level, and can be used as materials of glazed ceramic material, glass and other raw materials.

Abstract: In this paper, separation of weak magnetic iron ore with micro-fine particle was summarized on the base of the reason why this kind of iron ore was so difficult to be used. The methods used now for the fine particle separation were narrated. Four aspects were proposed to utilize the resource with high efficient.

Abstract: Theoretical and experimental study of loss angle of polymer melts at high shear rate was done based on multi-function and all-electric rheometer (MAR) designed by the authors. The phase difference of the dynamic components of shear strain and shear stress at the capillary wall proved to be as same as the phase difference of superimposed vibration displacement and the entrance pressure. In order to get the loss angle, the intrinsic vibration displacement was defined and original signal was transformed from time domain representation to frequency domain representation by DFT. The experiment results show that the loss angle increases greatly with the increase of the superimposed vibration displacement frequency. It indicates that the viscous losses increase while the elastic properties decrease with the increase of the superimposed vibration displacement frequency. The loss angle didnt change notably with the increase of the piston steady velocity and the superimposed vibration displacement amplitude. This indicates that the viscoelastic properties keep consistence when the shear rate and piston amplitude changes.

Abstract: High-precision micro-fluid dynamic bearing is the key part in a hard disk drive, as it offers low noise levels, high speeds and high rates of accuracy with low amount of vibration. To enhance the performance, a thin sheet component called sleeve housing are newly adopted in FDB. In this paper, multi-stage sheet metal forming process is utilized to fabricate the sleeve housing component. Multi-stage drawing simulations are conducted to investigate the adequate process parameters preventing wrinkling and tearing. From the simulation result, multi-stage drawing processes are conducted with progressive die sets in order to evaluate the forming accuracy. The results reveal that it is successful to fabricate the sleeve housing component with multi-stage drawing process.

Abstract: In order to analysis modal characteristic of bearing with pre-tightening force on main spindle of numerical control lathe, this paper proposes a model of spindle modality analysis. This model is used to simulate the preloaded bearing shaft system modal, and the simulation results are verified by modal experiment. This paper takes 7005c as the research object to establish the equivalent-spring model based on the Hertz theory considering the pre-tightening force, whose focus is dealing with the contact between bearings rolling element and raceway. Then the model will be used to get the bearing stiffness for finite element simulation analysis. The shafting modal with preloaded bearing test platform is structured to get the shaft system modal parameters, which is compared with and verified the simulation analysis.

Abstract: This article describes a method, based on drum test and performance of drive axle test, to find the distribution of resistance itself and its relationship with speed in whole driveline and drive axle by processing data from the results of test. A related analysis equation can be found by analyzing the power consumption with different torque inputs.

Abstract: A new apparatus which is the disc with the radiant fine stainless-steel filament is potential removal of dust apparatus by the analysis of dust removal. To evaluate its performance of dust removal, the experimental installation is built, the dust collection efficiency under dry and wet condition, the pressure drop, is measured in the experimental platform. It is also designed the wet dust precipitator and applied to the control of dust in mine tunnel. Results show that the disc is better dust collection efficiency under wet condition than under dry condition, the respirable dust collection efficiency is more than 80 percent averagely, and its pressure drop is also lower. Though these measures are initial, it is convincing that the disc can served as a part of precipitator by optimum design.

Abstract: This paper introduces a technology that 16 LED chips are integrated on a substrate to form a new type of high-voltage LEDs chipset. Monte Carlo method and Finite Element Method simulation are used to optimize the structure for making the best in the luminous flux, luminous efficiency and heat dissipation. Firstly, By the comparison of three kinds of high-voltage LEDs, the vertical structure, inverted trapezoidal structure and trapezoidal structure, the results show that the luminous efficiency of the entire high-voltage LEDs chipset used trapezoidal structure is the highest, the empirical data is 41.522%, which is 2.12 times than the vertical structure; this paper introduces the heat transfer performance of three kinds of high-voltage LEDs, the empirical data are 88.374°C, 82.652°C and 93.725°C. We can see that the vertical structure is the best. This paper also optimizes the high-voltage LEDs chipset, under the circumstances of the constant chip area, we change the area of the single chips, prompting the spacing between the single chips change. We get the best single chip area and single chip change, under this circumstance, we can get the best luminous efficiency and luminous flux.