This paper presents a design method of damage effect simulation platform, which can simulate the process of ammunition damaging the target, including the basic model of incoming ray simulation, the basic model of proj...
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Using high-precision zircon U-Pb ID-TIMS geochronology,tuffs from the Chang 9 shale and the Chang 7 shale were *** tuff in the Chang 9 shale is 241.47±0.17 Ma,which falls between the top tuff age of 241.06±0...
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Using high-precision zircon U-Pb ID-TIMS geochronology,tuffs from the Chang 9 shale and the Chang 7 shale were *** tuff in the Chang 9 shale is 241.47±0.17 Ma,which falls between the top tuff age of 241.06±0.12 Ma and the bottom tuff age of 241.558±0.093 Ma in the Chang 7 *** reveal that the Chang 9 and Chang 7 shales are contemporaneous,belonging to the Ladinian stage of the Middle *** insight expands the region of the main source rock of Chang 7 to the northeast and will inform the search for the deep Chang 9 shale petroleum system,increasing the scope for exploring the Chang 7 shale system in northern *** research results clarify the relationship between the two sets of shale in the Yanchang Formation and redefine the distribution range of the Chang 7 shale in the Ordos *** the same time,it shows that there is a cross-layer problem in the stratigraphic division of the Yanchang Formation in different regions,the high-precision U-Pb dating technology providing a reference for the fine stratigraphic correlation of other continental basins in the world.
Different steel welding joints are widely used in special equipment and often bear the role of high temperature and high pressure, and corrosive media. Because dissimilar steel welded joints are prone to residual stre...
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The uses of fillers in composites are creating new opportunities in the composite industry. Hollow Glass Microspheres (HGM) are Soda-lime-borosilicate glass hollow spheres with thin walls used as low-density filler ma...
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The uses of fillers in composites are creating new opportunities in the composite industry. Hollow Glass Microspheres (HGM) are Soda-lime-borosilicate glass hollow spheres with thin walls used as low-density filler material which can reduce final part weight by up to 15% or more without compromising the mechanical integrity. Glass bubbles take up 20 times the space of normal mineral filler, lowering the cost per unit volume;hence, the need for weightless and high-strength materials for state-of-the-art engineering applications may be met by HGM reinforced composites. Epoxy being a key structural material for marine, automotive and aerospace applications, is known for its brittle nature, poor mechanical and thermal properties and to date, not much work has been done on hollow glass microspheres reinforced carbon epoxy composites, however few systematic studies showing the influence of reinforcements on mechanical and thermal properties of carbon epoxy/HGM composites were conducted. Moreover research on Carbon/Epoxy - Hollow Glass Microsphere composites is limited, this study focuses on it. To study the ramification of low density fillers on physical, thermal and mechanical properties of composites, laminates with Epoxy resin and Carbon fiber reinforcement along with various percentages of the HGM's 0.2, 0.4, 0.6, 0.8, 1.0 wt. % were fabricated using a 3-axis filament winding machine and cured. The test specimens were cut according to ASTM standard from the unidirectional laminated sheets. The microstructure, thermal and mechanical properties of CE/HGM composites was studied by Field Emission Scanning Electron Microscopy (SEM), Thermogravimetric Analyzer (TGA) and tensile experiment. Microscopic observation indicated agglomerations and some HGM particles stop participating. This restricted the CE/HGM matrix stress transfer and reduced the tensile strength of the composites and also reduced the adhesion interface between the filler and the matrix thereby resulting in l
Visual scene is the foundational part of system confrontation and three-dimensional display, and its quality is directly related to the interaction degree between users and software. Aiming at the requirements of dyna...
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Computer-aided design (CAD) technology provides a new possibility for the recording and presentation of ICH culture because it can generate high-precision digital models. Computer vision technology can identify, extra...
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This paper deals with the control problem for a class of cascaded nonlinear systems holding a wide application. The nonlinear system is firstly given and analyzed. In what follows, the classical backstepping method an...
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Recently, Additive Manufacturing (AM) has been attracting attention as the breakthrough manufacturing technology and is being aggressively researched and developed around the world. Metal AM enables the integration of...
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A four-cable mount system is proposed for full-model wind tunnel flutter tests,which may adjust the pitch and roll attitude of the aircraft scaled model and ensure that the model is not subjected to cable *** system p...
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A four-cable mount system is proposed for full-model wind tunnel flutter tests,which may adjust the pitch and roll attitude of the aircraft scaled model and ensure that the model is not subjected to cable *** system provides sufficient support to simulate the free flight of the aircraft by applying appropriate spring stiffness and cable *** proposed fourcable mount system is modeled based on Lagrange mechanics,and its dynamics equations consider aerodynamic *** singularity of the system and its bifurcation characteristics under flow conditions are analysed to determine the supercritical bifurcation phenomenon for different tension levels and distances from the front suspension point to the mass centre of the *** mathematical expressions of the longitudinal flight stability of the cable mount system are derived by linearising the system dynamics equations using small *** influence of the cable tension,spring stiffness,suspension point position,and other factors on the flight stability of the aircraft are analysed.A feedforward control algorithm is proposed to minimize the total elastic potential energy of the *** results show that the model is in the level flight state when the elastic potential energy of the four-cable mount system is minimized.A feedback control design method is proposed based on the Lyapunov stability theory to derive the closed-loop stability *** system dynamics model that includes the aircraft rigid body model,flexible cables,pulleys,springs,aerodynamic model,and servo motor control is established using the flexible multibody dynamics method.A multibody dynamics solver and Simulink are used to simulate the attitude adjustment of the model in the wind tunnel and verify the supercritical bifurcation characteristics of the system and the effectiveness of the feedback and feedforward control.
Theoretical models of temperature assessment are important to design a product in Low temperature field. In this paper, equation and finite element analysis model between temperature and time were built by heat transf...
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