Numerical and experimental study on honeycomb sandwich structure with a rectangular cut-out were carried out in this paper. Two designs were presented, with using a U-shaped sandwich structure or a combination of two separate sandwiches. Finite element models were developed and calculated using MSC.NASTRAN code by means of linear analysis and non-linear incremental deformation analysis. Compared with linear analysis, non-linear analysis was more suitable to evaluate the ability of sandwich structure with cut-out to resist compressive load. The results obtained from non-linear solution were verified by the supporting mechanical tests.
By using ANSYS software parameter of design language APDL the parametric design macro program of two types of equilateral triangle cylindrical lattice shell are given with the given parameters of the span S, the length L, the rise F, the number of lattice in the span direction the model of equilateral triangle cylindrical lattice shell would be obtain easily. Thus offer convenience for force analysis and optimization design about this structure. The force analysis of the two type equilateral triangle cylindrical lattice shell is done. By contrast with the five typical cylindrical shells, the two type equilateral triangle cylindrical lattice shell has good rigidity and strength, and has application value in practice engineering.
In order to grasp how the sectional sizing optimum design imposes effect on the global stability of latticed shell, with an example of K6 single-layer reticulated shell whose span is 60 meters and vector height is 6 meters, the impact of different ways in rods grouping and valuing sectional size on bars buckling discipline and mechanical performance was analyzed. Factors like the strength and slenderness ratio of members, local and overall stability of structure are entirely taken into account to guarantee the accuracy of the analysis results. The results show that optimum design of sectional sizing on single-layer latticed shell can reduce the steel consumption, change the buckling discipline and improve the ultimate stable bearing capacity of structure, but simultaneously it would bring about a smaller deformation, and no significant early warning of damage comes up when structural instability failure occurs.
Using ANSYS software comes with parametric design language APDL, developed a square pyramid partial double layer of Schwedler spherical reticulated shell parametric design macro program; achieved this kind of spherical shell parametric modeling with the given shell span S, vector high F, the thickness (height) of the pyramid, ring copies of the symmetric region Kn and radial nodes laps Nx. Analyzed the static performance of the spherical reticulated shell under different structural parameters, studied the displacement of the structure and the distribution of the stress change with macroscopic geometric parameter change rule. Analysis results of eight kinds of conditions showed that the square pyramid partial double layer of Schwedler spherical reticulated shell has good mechanical performance. The result of the analysis provides a theoretical basis for the relevant engineering design.
The paper describes a small batching machine control system that takes chip C8051F040 as the core controller. The system that has automatic control and manual control modes can complete the high-precision automatic weighing of few powder and granular material. This article describes the composition of the control system and the major design of hardware, and provides more detailed software program scheme.
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