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Träfflista för sökning "LAR1:ltu ;srt2:(1990-1999);hsvcat:2"

Sökning: LAR1:ltu > (1990-1999) > Teknik

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1.
  • Axsäter, Sven, et al. (författare)
  • Evaluation of a new type of sequential lot sizing techniques
  • 1990
  • Ingår i: Engineering Costs and Production Economics. - 0167-188X .- 1878-4011. ; 19:1-3, s. 281-286
  • Tidskriftsartikel (refereegranskat)abstract
    • The classical dynamic lot size problem without backlogging is usually solved with the aid of various heuristics. Most heuristics are sequential, i.e. the demand is considered period for period, and a decision whether to include the demand in a certain period in the preceding batch is taken without regarding the future demand. Recently, it has been shown how to design a sequential lot sizing rule that will optimize the average performance, provided that a typical demand looks like a sequence of independent and identically distributed random numbers. The purpose of this paper is to evaluate if and how this methodology can be implemented in practice. The new lot sizing techniques are evaluated in a simulation study for different types of demand.
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2.
  • Drugge, Lars, et al. (författare)
  • The nonlinear behaviour of a pantograph current collector suspension
  • 1999
  • Ingår i: Proceedings of the 1999 ASME Design Engineering Technical Conferences.
  • Konferensbidrag (refereegranskat)abstract
    • The pantograph-catenary system is a critical component for trains required to run at higher speeds. The pantograph often includes nonlinear characteristics and the scope of this work is to investigate if nonlinear dynamic phenomena can occur in an existing design. A model of a pantograph suspension subsystem has been developed according to physical parameter values of the head suspension of the Schunk WBL88/X2 pantograph, providing electric power to the Swedish high-speed train X2. Studies of the system response for different force excitation show both harmonic, subharmonic and chaotic behaviour for the investigated parameter regions.
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  • Svoboda, Ales, et al. (författare)
  • Simulation of hot isostatic pressing of a powder metal component with an internal core
  • 1997
  • Ingår i: Computer Methods in Applied Mechanics and Engineering. - 0045-7825 .- 1879-2138. ; 148:3-4, s. 299-314
  • Tidskriftsartikel (refereegranskat)abstract
    • This paper presents a finite element simulation of the thermomechanical phenomena occurring during Hot Isostatic Pressing (HIP) of a powder metal component which includes a graphite core. The thermomechanical coupling is achieved in a staggered step manner. The staggered step approach considers the coupled thermomechanical response of solids, including nonlinear effects in both the thermal and mechanical analyses. The creep behaviour of the powder material during densification is modelled using the constitutive equations of thermal elasto-viscoplastic type with compressibility. The various mechanical material properties are assumed to be functions of temperature and relative density. The mechanical solution also includes large deformation and strains. The thermal problem includes temperature and relative density dependent specific heat and thermal conductivity. The constitutive equations and relations for thermal characteristics are implemented into the implicit nonlinear finite element code, PALM2D. The simulation of the HIP process of a component with internal core is chosen as an application example. The component, injection molding tool, is produced of a hot isostatically pressed stainless tool steel with an internal cavity which is achieved by inserting a graphite core into the HIP container. To verify the result of the simulation, the geometry of the capsule and the coated core are measured both before and after pressing using a computer controlled measurement machine (CMM). The measured geometry is compared with the simulated final shapes of the container and internal core. A computer-aided concurrent engineering system (CACE) is used for the complete manufacturing process from the design of the component and finite element simulation to the inspection of the final geometry.
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