• 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....

    pdf24 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 653 | Lượt tải: 0

  • 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: 577 | 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: 466 | 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 ...

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  • 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 ...

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  • 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: 477 | Lượt tải: 0

  • Simulation of machine interference in randomly changing environmentsSimulation of machine interference in randomly changing environments

    Main features of a simulation tool have been introduced whic was developed for the investigation of the machine interference problem evolving in random environment(s). Steady-state performance measures of the system have been obtained under several service disciplines, assuming hypoexponentially distributed running and service times. Some sampl...

    pdf10 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 456 | Lượt tải: 0

  • On a class of non-Linear differential equations with exact solutionsOn a class of non-Linear differential equations with exact solutions

    - Equation of the form (1) is non-linear differential one, general exact solutions of which can be found. They include many particular cases, where exact solutions were defined by other methods. - To obtain exact solutions of non-linear differential equations of the form (1) one needs to know important informations about particular solutions (8...

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  • Controlling two-Wheeled self-balancing robot moving on inclined planeControlling two-Wheeled self-balancing robot moving on inclined plane

    This project has successfully presented that two – wheeled self – balancing robot can move on plane, inclined plane and preset orbit. The robot can itself balance when it was changed gravity by force from outside. It also can be controlled from smartphone or laptop. However, there are still some shortcomings. Although the robot can move forw...

    pdf8 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 570 | Lượt tải: 0

  • Experimental study on static thrust characteristics of Master Airscrew E9x6 propeller with ductExperimental study on static thrust characteristics of Master Airscrew E9x6 propeller with duct

    The thrust measurement system, presented in this paper, is used for the experimental study on the static thrust characteristics of the Master Airscrew E96 in cases of with duct and without duct. The results obtained indicate that it could be applied not only to test the thrust characteristics of small UAVS’s propellers but also to validate t...

    pdf7 trang | Chia sẻ: huongthu9 | Ngày: 12/08/2021 | Lượt xem: 520 | Lượt tải: 0