The Green Flight Challenge occurred in September 2011 as a competition to spur extreme flight efficiency for general aviation aircraft. In order to compete, an aircraft had to demonstrate flight over a 200 mile course at an average groundspeed of 100 mph with a fuel efficiency greater than 200 passenger miles per equivalent gallon. This paper describes the design of Taurus G4, the world’s first four-seat electric-powered aircraft, and the flight-planning techniques used in winning the competition. The aircraft demonstrated flight over a 196 mile course at an average speed of 107 mph and an average equivalent fuel efficiency of 403.5 passenger miles per equivalent gallon of automotive gasoline. In this demonstration, it showed that battery-powered flight is practical for general aviation missions. Comment: Publication demonstrates our leading results in the field of aeronautics.
E.02 International awards
COBISS.SI-ID: 10016340This paper represents the elements and the use of the upgraded simulation system, developed in the last half decade for Štore Steel billet continuous caster. The simulation system is used in the context of the state-of-the-art automation and information of the twenty five year old three strand Concast billet continuous caster for dimensions square 140 and 180 mm with the capacity of 160 000 tons/year. The simulation system is used in the off-line and on-line modes. The off-line mode is used in order to set the proper process parameters and to calculate the temperature field, macrosegregation, and grain structure of the billet. It is also used to calculate the changes in the caster design such as the secondary cooling and the position of the SEN. The on-line model is used in automatic casting control system. The paper represents an update of our BHM publication of 2005 (Application of Continuous Casting Simulation at Štore Steel, BHM, Vol. 150, No. 9, 300–306). Comment: Paper demonstrates leading results of the project group and their impact in metallurgical industry regarding physical modelling of the metallurgical processes.
F.09 Development of a new technological process or technology
COBISS.SI-ID: 2761467A simple Lagrangean type traveling slice model has been applied for the prediction of the relations between process parameters, macrosegregation and solidification grain structure formation (equiaxed to columnar and columnar to equiaxed transition) during the continuous casting process of steel billets. The main advantage of the slice model is its very fast calculation time in comparison with the complete 3D heat and fluid flow model which might need calculation time, measured in days. The slice models thus allows for fast optimisation and even for on-line simulation. The heat and species transfer models are based on the mixture continuum assumptions with Lever solidification rule and enhanced thermal and solutal diffusivities for heuristic accounting of fluid flow effects. The grain structure evolution model is based on the Gaussian nucleation rule, and KGT growth model, coupled to the macroscopic heat and species transfer models. The heat and species transfer models are solved by the meshless technique by using local collocation with radial basis functions. The grain structure evolution model is solved by the point automata technique, a novel meshless variant of the cellular automata method. A comparison of the results with the experimental data for steel grade 51CrV4 is shown in terms of macrosegregation and grain structure across the billet. Simulations and comparisons have been carried out for nominal casting conditions, reduced casting temperature, and reduced casting speed. The model predicts surprisingly well the qualitative features of the macrosegregation and grain structure patterns. The model of hot rolling consists of the coupled thermal model, mechanical model and model for node positioning and manipulation. We present rolling of square steel billet to circular bar. Possible refinements of the model with respect to other physical mechanisms are discussed. Comment: We have in addition to the presented invited keynote lecture at APCOM2013 conference in Singapore, which will be published in EABE journal, organized a minisimposium "MS-86 Computational modelling of casting, rolling and heat treatment processes".
B.04 Guest lecture
COBISS.SI-ID: 3129339The purpose of the present paper is development of a Non-singular Method of Fundamental Solutions (NMFS) for Stokes flow problems, widely applicable in biomedical engineering. The NMFS is based on the classical Method of Fundamental Solutions (MFS) with regularization of the singularities. The Stokes problem is decomposed into three coupled Laplace problems. The solution is structured by collocating the pressure and the velocity field boundary conditions by the Laplace fundamental solution. The regularization is achieved by replacement of the concentrated point sources by distributed sources over the disks around the singularity of fundamental solution. The NMFS solution is compared to MFS solution and analytical solution (a.s.) in case of simple 2D duct flow. The described developments represent a first use of NMFS for Stokes problems. The method requires the discretization on the boundary only and is easily applicable in 3D, thus representing an ideal candidate for solving complex biomedical engineering free and moving boundary flow problems in the future. Comment: This paper represents a first biomedical publication of the programme group.
F.02 Acquisition of new scientific knowledge
COBISS.SI-ID: 3041019We make an overview of our achievements in the development of meshless local radial basis function collocation method in simulations of casting, rolling and heat treatment at the respectable Polish technological university. We describe the use of the method in termomechanical processing of steel and aluminium alloys. Comment: Silesian technical University sent after the lecture two students on fellowship at the Laboratory for Multiphase Processes of the University of Nova Gorica.
F.09 Development of a new technological process or technology
COBISS.SI-ID: 2938875