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The body of the armored vehicles, as a large box-type load-bearing structure, not only has to bear various loads, but also has a certain protection ability. It is a complex load-bearing system. The body is an important carrier in the whole life cycle of the armored vehicle. The structural design of the body and the analysis of the test mode have an important impact on the performance and reliability of the armored vehicle. In order to obtain the dynamic characteristic parameters of an amphibious vehicle body and verify its structural rationality, a new material amphibious vehicle body was taken as the research object, and computational modal and experimental modal analysis respectively were carried out. The reliability of the finite element model was verified by the comparative analysis of the modal parameters of the body and the test modal results. Based on the modal distribution of the body structure of the amphibious vehicle, the rationality of the body structure design was analyzed, which could avoid the occurrence of most low-order modal couplings. At the same time, in order to avoid the resonance generated in the vehicle maneuvering, the matching design of the external excitation sources such as the suspension device is put forward, which provides a theoretical basis for the optimal design of the body structure of an amphibious vehicle and the improvement of the dynamic response characteristics of the vehicle. [ABSTRACT FROM AUTHOR]

The microchannel equipment has efficient heat and mass transfer capabilities, which is conducive to the effective mixing of gas-liquid multiphase flow, thus improving the production efficiency of industrial applications. However, for industrial applications, the study of gas-liquid two-phase flow patterns in microchannels with irregular shapes has always been a difficult point. Based on the optimized Y-shaped composite microchannel structure, the flow visualization experiment of the full flow field in the complex microchannel was carried out, which realized the comprehensive measurement of the gas-liquid multiphase flow pattern under different flow rates in the microchannel, obtained the gas-liquid two-phase flow distribution in the microchannel based on high-speed photography, judged the internal flow pattern in the Y-shaped composite microchannel, and conducted numerical simulation of the gas-liquid two-phase flow pattern. The pressure distribution along the flow path was extracted. Time averaged characteristic area was used to evaluate the area of high efficient gas-liquid mixing region under different flow patterns. The numerical simulation results show that the flow pattern of gasliquid multiphase flow significantly affects the mixing intensity of gas-liquid multiphase flow, promotes the mixing effect of gas-liquid two-phase flow, and increases the gas-liquid contact area. [ABSTRACT FROM AUTHOR]

Lucaogou Formation is the main formation for tight oil exploration and development in Junggar Basin. In order to analyze the geological characteristics and distribution of favorable areas, the favorable areas were divided based on the analysis of organic matter type, total organic carbon(TOC) content, maturity, reservoir rock type and porosity and permeability, combined with the lower limit of reservoir formation and burial. The results show that the organic kerogen types of Lucaogou Formation are mainly type Ⅰ and type Ⅱ1, with TOC content ranging from 0. 16% to 13. 86%, average content above 3. 0%, and average content of calcareous mudstone is 3. 79% . The maturity of organic matter is between 0. 55% and 1. 35%, and the main body is more than 0. 8% . From west to east, the maturity of organic matter decreases gradually, and it has the characteristics of wide distribution and large thickness, including the upper and lower two “source sweet spots”, and the thickness of “the lower sweet spot” is larger than “the upper sweet spot”. Reservoir rock types are diverse, high-quality reservoirs are concentrated in transitional rocks, dolomitic siltstone is the main reservoir rock type, and the pore structure is dominated by fine pore throats, which are typical low porosity and ultra-low permeability reservoirs. The porethroat connectivity is good, and the reservoir porosity-permeability correlation is good. Combined with the lower limit of tight oil accumulation depth, the favorable exploration areas of the first and second member of the Upper Lucaogou Formation are divided. The favorable exploration areas of the second member of the Lucaogou Formation are mainly distributed in well J32-H-J25-J32-J22 in the southeast of the sag, and the favorable exploration areas of the first member of the Lucaogou Formation are mainly distributed in well J251-J32-J174 in the middle and south of the sag. [ABSTRACT FROM AUTHOR]