Papers by Author: Jin Gang Liu

Abstract: Multi-fractal theory is used to detect fractal behaviors embedded in grain size distribution ofsinter with low SiO2. Impacts of SiO2, basicity, and MgO on structures of sinter ore are measured quantitatively by means of fractal dimension dm, d(1) and multi-fractal strength Δd. Increase of SiO2 induces decrease of fractal dimension and multi-fractal strength. While proper levels of carbon, basicity, and MgO lead to minimum values of fractal dimension and multi-fractal strength. This kind of quantitative measurement of structures in sinter ore can help us to investigate the relation of mechanical properties and structures in a quantitative way.

Abstract: The pore distribution of low silica sinter ore samples with different alkalinity was measured by pressure mercury, and the fractal characteristic of pore distribution was calculated with multifractal theory, then metallurgical properties were also obtained, finally, their connection among them was discussed. The results showed that the pore distribution has experienced a process from non-uniform to uniform with increasing alkalinity. When the alkalinity was 2.0, the spectral width Δα was minimum, multifractal structure was more uniform, fractal characteristics was better, in the meantime, the pore distribution was more uniform, and the pores were larger, which improved metallurgical properties. The results also showed that when the alkalinity was 2.0, its metallurgical properties was optimal.

Abstract: Based on the function of Chooks in MasterCAM, the section of a oval gear is generated. An oval gear 3D Model is established using the section in UG, then a pair of assembling oval gear in UG is imported into ADAMS, motion simulation results are validated and compared with the theoretical value. The results indicate that the profile conversion method can meet the design requirements in certain conditions of transmission accuracy, and effect of eccentricity to the transmission of oval gears is summarized.