Some compressive tests and measurements of penetration forces and displacements were performed on pharmaceutical tablets. Force during the process of penetration is the same as the resistance of the gel. Results were presented on graphs of penetration force (cN) and penetration displacement through the gel (mm). Experiments were performed on uniaxial testing machine Zwick/Roell Z050.
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COBISS.SI-ID: 12236827Mechanical properties of 0,045 thick polyethylene foil were measured on uniaxial testing machine Zwick/Roell Z050. Measured foil is used in automotive industry as protection wrapping. Specimens were cut from foil in two perpendicular directions. Results were presented on graphs of force (N) and displacement (mm).
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COBISS.SI-ID: 12284443Numerical validation and comparison of propeller integral and distributive properties has been made. Theoretical model has been used to design (optimize) propeller blade for certain design point and analyze it at a range of working conditions. Through numerical simulation of such a propeller was performed in order to assess and obtain insight in validity of theoretical predictions. Theoretical model used is extended blade-element momentum model. Numerical simulations employed are based on finite volume numerical scheme. Boundary layer is modeled by adaptive logarithmic wall functions. Turbulence is accounted for by unsteady turbulence model. In general good agreement among theoretical predictions and numerical simulations exists as far as integral quantities such as thrust, torque and efficiency of the propeller are concerned. On the other hand there is a significant departure among theoretical and numerical data observed as far as distributive quantities such as thrust- or torque-distribution along propeller blade is in question.
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COBISS.SI-ID: 12410651In the paper, we present an enhanced numerical method for the forming tool design optimisation in sheet metal forming. The applied procedures enable a determination of appropriate forming tool geometry so that manufacture of a formed product with specified geometry would be ensured. Apart from springback occurred by the formed part after removal of the forming tools also impact of thinning of the sheet metal during the forming process is considered in the method, and both effects are correspondingly compensated in an iterative procedure of the forming tool geometry determination. The enhanced displacement adjustment method (E-DA) is based on the well-known displacement adjustment (DA) method the application of which is indeed relatively simple, but has proved also, due to an increased number of iterations needed to achieve the required tolerance and possible loss of accuracy, to be less successful when forming of parts with more complex geometry is considered. Computational efficiency in the E-DA method is achieved by applying additional point topology mappings, which establish corresponding interrelations between the discretised point topologies used in the definition of the prescribed product geometry, current tool geometry and on this basis actually computed product geometry, contributing thus significantly in improving the accuracy of communicated data. The advantage of the improved method over the conventional DA method is demonstrated by considering the forming tool design optimisation in channel bending and forming of cylindrically symmetric products.
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COBISS.SI-ID: 12299291In this paper is presented mathematical algorithm that determines the fluid flow velocity vector (direction, intensity and orientation), based on measured voltages on multi-channel hot-wire anemometer. As the voltage on constant temperature hot-wire anemometer (CTA) is non-linear function of velocity and angle of the fluid, inverse function is also non-linear and has several mathematically correct solutions. In the Laboratory of Non-linear Mechanics at the Faculty of Mechanical Engineering in Ljubljana, we have decided to try developing multi-channel hot-wire anemometer with constant temperature at which it is possible to select physically correct solutions from several mathematically correct solutions. The mathematical algorithm works correctly if the range of instrument operation is limited for the value of spherical angles 58 degrees.
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COBISS.SI-ID: 12685083