• Nonlinear postbuckling of eccentrically stiffened functionally graded plates and shallow shellsNonlinear postbuckling of eccentrically stiffened functionally graded plates and shallow shells

    A formulation of the governing equations of eccentrically reinforced functionally graded plates and shallow shells based upon the classical shell theory and the smeared stiffeners technique with von Karman-Donnell nonlinear terms has been presented. By use of Galerkin method, explicit expressions of critical buckling loads and nonlinear load-def...

    pdf17 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 472 | Lượt tải: 0

  • A formula of evaluating structural safety based on fuzzy set theoryA formula of evaluating structural safety based on fuzzy set theory

    Results obtained by the new formula and the formula [2] are the same. However, the new formula is applied easily in cases we can’t define the intersectional part area of two sets S˜ and R˜, while the formula in [2] is not applicable. It can be seen the "Formula of area ratio" is more general for evaluating safety of structures. Because this for...

    pdf8 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 458 | Lượt tải: 0

  • New concepts of theory of gearing and a method for reverse synthesis of the gearingNew concepts of theory of gearing and a method for reverse synthesis of the gearing

    Base on the results of our research for years into the investigation of the theoretical and practical application of the gearing we have developed the following theories: - Theory of gearing with the favourite contact ellipse. - Theory of gearing with the elastohydrodynamic film thickness. - Generation of gear without the restriction of the use...

    pdf9 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 483 | Lượt tải: 0

  • Decision making in reverse logistics using system dynamicsDecision making in reverse logistics using system dynamics

    This research analyses the Reverse Logistics network using SD methodology. After a well work-out of the reverse logistics model, we come up with the impression that the study of this field must continue. It is important to understand the necessity of the reverse channel and the economical and ecological profits from it. We believe that in the n...

    pdf14 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 507 | Lượt tải: 0

  • A simple weak form for contact problems with coulomb frictionA simple weak form for contact problems with coulomb friction

    The weak form (19) has been designed as an extension of the standard virtual work principle to deal with the contact problem with Coulomb friction. Since it is a genuine weighted residual relationship involving arbitrary (regular) virtual displacements and multipliers, it can be discretized by means of the finite element method in a simple way....

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  • The optimal control in batch arrival queue with server vacations, startup and breakdownsThe optimal control in batch arrival queue with server vacations, startup and breakdowns

    For the N policy M[x]/G/1 queuing system, we easily derived some important system characteristics through the key probability - generating function and decomposition property. We also performed a numerical analysis between the optimal value N and the specific values of system parameters. The model is significant since more general situations in...

    pdf15 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 544 | Lượt tải: 0

  • Standard gradient models and crack simulationStandard gradient models and crack simulation

    In this paper, the constitutive equations of standard gradient models are conveniently described from the expressions of the energy and the dissipation potentials. Our attention is focussed on the derivation of the governing equations as a generalized Biot equation, on the formalism of generalized standard materials and on time-dependent processe...

    pdf9 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 456 | Lượt tải: 0

  • Simulated annealing and joint manufacturing Batch-SizingSimulated annealing and joint manufacturing Batch-Sizing

    A model for a two-stage batch environment has been proposed in this paper. This model takes a finite-rate of production into account and jointly determines batchsizes for the product and order-sizes for the associated raw materials. To avoid complexity in formulation, the variable and are assumed to be integers for all cases. However, these are ...

    pdf15 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 525 | Lượt tải: 0

  • Intelligent nesting systemIntelligent nesting system

    In the paper, the problem of identification (perception) of a shape has been solved by applying neural networks. Thus, a natural way of shape identification has been modelled. Namely, the network, by being trained on a raster product model and on a certain number of parts, becomes trained for the basic shape of the part. The trained network is ...

    pdf15 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 496 | Lượt tải: 0

  • Reliability analysis of a two-Unit standby system by computer simulationReliability analysis of a two-Unit standby system by computer simulation

    For the two-unit standby system with repair and with different preventive maintenances we made the program which simulates its work and which allows us to analyze the reliability of the system depending on different maintenance strategies. The possibilities of the simulation program are illustrated by a concrete example. The program allows the ...

    pdf10 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 465 | Lượt tải: 0