Hidria (Slovenia)

The construction industry suffers from the lack of adoption of advanced technologies. As a consequence, construction is among the least productive industries across various sectors. The researchers often point out that the critical issue is the lack of integration throughout the building project life cycle. Lack of information integration causes reworks unexpected changes, lower construction quality, delays, and on-site conflicts, which could be addressed in advance by a proper constructability study executed already in the design phase. Constructability is a technique that examines the logic of construction from the beginning to the end, seeking technical solutions that reduce project cost, time, and waste. The central part of the thesis provides a comprehensive overview and analysis of non-technical and technical constructability issues. Special attention is given to Lean and BIM approaches, which may serve as driving mechanisms that substantially improve constructability. The presented work tries to identify the value and integration of mechanisms for the improvement of constructability issues. Among the technical issues, the rationalization of the design plays an essential role in improving the execution and reducing project costs and delays. The final part of the thesis focuses on the rationalization of design addressing constructability issues by employing Generative Design. This approach is demonstrated in a case study of a complex building –Stožice Arena. The Arena case study shows the design rationalization techniques using generative design and machine learning, enabling informed shaping and clustering of the building envelope. The presented solution contributes to the evolving field of future architectural-structural design methods.

A arborização urbana é de suma importância ao ambiente construído por propiciar melhorias nos aspectosfísicos, ecológicos e sociais deste meio. Para que ocorram tais melhorias, é necessário equilíbrio entre os elementos artificiais e naturais do ambiente. O objetivo desta pesquisa foi à análise da compatibilidade da arborização viáriacom as infraestruturas urbanas de Luiziana, Paraná. A pesquisa utilizou-se de inventário em oito vias da cidade, onde se analisou o comportamento dos espécimes vegetais em campo no tocante a relação planta/infraestrutura. Foram identificados 1540 indivíduos vegetais, distribuídos em 47 espécies, 38 gêneros e 24 famílias botânicas, onde, Ligustrum lucidum, Caesalpinia pluviosa, Schinus molle e Murraya paniculata são as espécies predominantes, representando 73,18% da arborização trabalhada. A cidade apresenta problemas relacionados ao manejo das árvores, fator evidenciado uma vez que 88% das árvores possuem altura da 1° bifurcação inferior a 1,80 metros.Constatou-se problemas relacionados à quebra do calçamento ocasionado pelo sistema radicular da planta. Para tanto se faznecessário o (re) planejamento da arborização com o intuito de promover melhorias nos incômodos físicos e visuais ocasionados pela incompatibilidade das árvores para com os demais elementos da paisagem urbana.

There are different types of electric motors; one of them is the induction motor.Such a motor consists of a winded stator and an induction rotor.The rotor squirrel cage is made with aluminium high-pressure die casting technology.Besides relatively low motor-producing costs and good repeatability, the motor efficiency and torque/speed characteristics are also important.One of the loss factors for the rotor is the loss of conductance of die cast material.This study researches how different casting conditions influence the material's electrical resistivity of Al 99.7.With melting of the alloy in an induction vacuum furnace and testing various casting conditions during the solidification (such as the vacuum, air and filtering), the temperature and electrical resistivity of the castings were measured using the four-point measuring method.The porosity proportions of the samples were examined with X-ray, as well as with optical microscopy.The presence of Fe-eutectic (a-Al + Al13Fe4) was confirmed in the investigated samples' microstructures, as was predicted by a calculation of the equilibrium phase diagram.The electrical resistivity values were additionally measured with an eddy-current measuring method.The results show a good correlation with the four-point measuring method and are in a range 29-33 nWm at 20 °C.Based on the obtained results, the influence of impurities and porosity on the electrical properties of aluminium was evaluated.

This paper presents a low-cost fault-tolerant system for open-phase fault (OPF) in a power-converter-fed permanent-magnet synchronous machine. The proposed fault-tolerant system is based on field orientation control with additional fault tolerance functionality. A current predictive method for OPF detection is presented, together with an estimation of the threshold level for detection. The proposed method is based on the prediction of stator current for the next sampling interval. Furthermore, a new method for postfault operation of the machine is proposed. For optimal performance of the complete drive, a prefiring angle is introduced in order to avoid the temporary generation of negative torque. This improvement increases the average generated postfault electromagnetic torque, and consequently, it reduces the mechanical stress on various machine parts. The proposed fault detection and postfault operation solutions were simulated in MATLAB, and they were also tested on an experimental setup. The results show several advantages of the proposed fault-tolerant solution, like its short fault-detection time, substantial robustness against variation of machine parameters or load fluctuations, and negligible implementation costs, since no hardware modifications are needed. The fault detection algorithm does not require high computing power, and it operates well even during transients.