Current Issue : April - June Volume : 2013 Issue Number : 2 Articles : 5 Articles
The diverging diamond interchange (DDI) can improve traffic flow by limiting the number of phases in the traffic signals and\r\nimprove safety by eliminating left turns. A few instillations of these interchanges have been constructed and there is great potential\r\nto construct more. In an effort to develop a methodology to evaluate these interchanges, this paper presents the development of a\r\ndiscrete event simulation model of the diverging diamond interchange (DDI). Specific emphasis is on using simulation to model\r\nthe DDI, a description of the operation of the simulation model, and using simulation to understand the operation of the DDI.\r\nThe paper concludes that the use of the simulation package allows for rapid evaluation of the DDI and demonstrates that this\r\ninterchange design will not work in all locations....
A buckling analysis has been carried out to investigate the response of laminated composite cylindrical panel with an elliptical\r\ncutout subject to axial loading. The numerical analysis was performed using the Abaqus finite-element software. The effect of the\r\nlocation and size of the cutout and also the composite ply angle on the buckling load of laminated composite cylindrical panel is\r\ninvestigated. Finally, simple equations, in the form of a buckling load reduction factor, were presented by using the least square\r\nregression method. The results give useful information into designing a laminated composite cylindrical panel, which can be used\r\nto improve the load capacity of cylindrical panels....
Landing gear noise prediction method is developed using Building-Cube Method (BCM). The BCM is a multiblock-structured\r\nCartesian mesh flow solver, which aims to enable practical large-scale computation. The computational domain is composed of\r\nassemblage of various sizes of building blocks where small blocks are used to capture flow features in detail. Because of Cartesianbased\r\nmesh, easy and fast mesh generation for complicated geometries is achieved. The airframe noise is predicted through the\r\ncoupling of incompressible Navier-Stokes flow solver and the aeroacoustic analogy-based Curle�s equation. In this paper, Curle�s\r\nequation in noncompact formis introduced to predict the acoustic sound from an object in flow. This approach is applied to JAXA\r\nLanding gear Evaluation Geometry model to investigate the influence of the detail components to flows and aerodynamic noises.\r\nThe position of torque link and the wheel cap geometry are changed to discuss the influence. The present method showed good\r\nagreement with the preceding experimental result and proved that difference of the complicated components to far field noise was\r\nestimated. The result also shows that the torque link position highly affects the flow acceleration at the axle region between two\r\nwheels, which causes the change in SPL at observation point....
We present the thermal behavior of a batch reactor to jacket equipped with a monofluid heating/cooling system. Heating and\r\ncooling are provided respectively by an electrical resistance and two plate heat exchangers. The control of the temperature of the\r\nreaction is based on the supervision system. This strategy of management of the thermal devices is based on the usage of the thermal\r\nflux as manipulated variable. The modulation of the monofluid temperature by acting on the heating power or on the opening\r\ndegrees of an air-to-open valve that delivers the monofluid to heat exchanger. The study shows that the application of this method\r\nfor the conduct of the pilot reactor gives good results in simulation and that taking into account the dynamics of the various\r\napparatuses greatly improves ride quality of conduct. In addition thermal control of an exothermic reaction (mononitration)\r\nshows that the consideration of heat generated in the model representation improve the results by elimination any overshooting of\r\nthe set-point temperature....
Within a continuum framework, flows featuring shock waves can be modelled by means of either shock capturing or shock fitting.\r\nShock-capturing codes are algorithmically simple, but are plagued by a number of numerical troubles, particularly evident when\r\nshocks are strong and the grids unstructured. On the other hand, shock-fitting algorithms on structured grids allow to accurately\r\ncompute solutions on coarse meshes, but tend to be algorithmically complex. We show how recent advances in computational\r\nmesh generation allow to relieve some of the difficulties encountered by shock capturing and contribute towards making shock\r\nfitting on unstructured meshes a versatile technique...
Loading....