With the aim of synthesizing technical systems by using physical laws, an engineering designer proceeds from the fact that a great majority of physical laws includes variables and constants, which describe the essential geometry needed for their realization. For each physical law, a complementary basic scheme is chosen. The method presented in the article is based on the premise that if it is possible to describe a technical system with a physical law or a chain of physical laws, then it should also be possible to set up its basic geometry from a complementary basic scheme or from a chain of complementary basic schemata. The method enables a partially automatic approach to the elementary embodiment process and also provides support for elementary embodiment design.
COBISS.SI-ID: 12179483
Knowledge twisting is defined as a kind of manipulation of Physics P/Structure S/Design D (as mental objects) in order to achieve various Function(s) F. This paper presents a method in which prior synthesis of functional structure-with which the functioning of a future product would need to be described neutrally with respect to components-is not required for product concept. Empirical analysis has shown that the use of this method does not lead to a combinatorial explosion. The method is based on the chaining of physical laws and complementary basic schemata.
COBISS.SI-ID: 11043099
A method in which the complex flow near and through the openings of a porous wind barrier is treated at a detailed level. The flow characteristics of the turbulent wake behind the barrier are experimentally and numerically investigated. The wind barrier is accurately geometrically represented with a three-dimensional model in the numerical simulation. Barrier models consisting of horizontal bars with different inclination angles are considered. The unsteady Reynolds-averaged NavierStokes (URANS) computation is applied because the flow is not statistically stationary. The shear stress transport (SST) k turbulence model is used because it shows good behavior in adverse and separated flows. In addition to the three-dimensional URANS numerical study, an experimental study is performed to confirm the numerical data. The aim is to conduct an experimental and numerical study of a fluid flow through the geometrically accurate three-dimensional barrier model and analyze the bar inclination effect on the wake characteristics behind the barrier. As the bar inclination angle decreases, the bleed flow gets stronger, which results in a smaller reduction of the mean streamwise velocity. In addition, the turbulence intensity decreases in the shelter wake with a decreasing bar inclination angle.
COBISS.SI-ID: 13295899
This Extended Technical Note shows that the final accuracy level of reverse engineered surfaces depends on scanning distance and scanning angle of the laser beam, hence it also depends on the morphology of the scanned objects. On scanning strongly curved objects, such as the ones with free form surfaces, the distance and impact angle of the laser beam are changing continuously during the scanning process. On the basis of these, two critical parameters are specified for the design model, which make it possible to predict these two factors in advance, depending on the morphology of the scanned object. First, a mathematical-statistical design model of the scanning process is generated, which relies on ANOVA (analysis of variance) and DOE (design of experiments). In the next step, a fitness function is optimized by the genetic algorithm (GA) program. This optimization improves the accuracy of the final scanned surfaces, in terms of the minimum standard deviation values of reverse engineered 3D surface model. The proposed approach was confirmed in a case study, which is presented at the end of this Technical Note.
COBISS.SI-ID: 11479067
A selection of achievements and first physics results are presented of the European Integrated Tokamak Modelling Task Force (EFDA ITM-TF) simulation framework, which aims to provide a standardized platform and an integrated modelling suite of validated numerical codes for the simulation and prediction of a complete plasma discharge of an arbitrary tokamak. The framework developed by the ITM-TF, based on a generic data structure including both simulated and experimental data, allows for the development of sophisticated integrated simulations (workflows) for physics application. The equilibrium reconstruction and linear magnetohydrodynamic (MHD) stability simulation chain was applied, in particular, to the analysis of the edgeMHDstability of ASDEX Upgrade type-I ELMy H-mode discharges and ITER hybrid scenario, demonstrating the stabilizing effect of an increased Shafranov shift on edge modes. Interpretive simulations of a JET hybrid discharge were performed with two electromagnetic turbulence codes within ITM infrastructure showing the signature of trapped-electron assisted ITG turbulence. A successful benchmark among five EC beam/ray-tracing codes was performed in the ITM framework for an ITER inductive scenario for different launching conditions from the equatorial and upper launcher, showing good agreement of the computed absorbed power and driven current. Selected achievements and scientificworkflowapplications targeting key modelling topics and physics problems are also presented, showing the current status of the ITM-TF modelling suite.
COBISS.SI-ID: 13385243