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A BIM-based approach supporting fire engineering
No full textFrom performance based approach to BIM-based approach. The exploitation of Building Information Modelling within Fire Engineering can be considered a further technical and technological development. The objective is to implement the BIM model with the most significant Fire Prevention information in order to use them during the building lifecycle by operators and rescuers, in particular for maintenance and emergency management. According to the phase of the project, it is possible to extend the data richness about structures, introducing materials and physical properties to the components, supporting for example the fire resistance checks. Furthermore, data exchange towards specialized software, as CFD analysis, is enabled through to the interoperability process optimizing time and accuracy of simulations
Inverse problem for multi-body interaction of nonlinear waves
No full textThe inverse problem is studied in multi-body systems with nonlinear dynamics representing, e.g., phase-locked wave systems, standard multimode and random lasers. Using a general model for four-body interacting complex-valued variables we test two methods based on pseudolikelihood, respectively with regularization and with decimation, to determine the coupling constants from sets of measured configurations. We test statistical inference predictions for increasing number of sampled configurations and for an externally tunable temperature-like parameter mimicing real data noise and helping minimization procedures. Analyzed models with phasors and rotors are generalizations of problems of real-valued spherical problems (e.g., density fluctuations), discrete spins (Ising and vectorial Potts) or finite number of states (standard Potts): inference methods presented here can, then, be straightforward applied to a large class of inverse problems. The high versatility of the exposed techniques also concerns the number of expected interactions: results are presented for different graph topologies, ranging from sparse to dense graphs
Ordinal aggregation operators to support the engineering characteristic prioritization in QFD
No full textQuality Function Deployment (QFD) is a consolidated management tool for supporting the design of new products/services and the relevant production/supply processes, starting from the so-called voice of the customer (VoC). QFD includes several operative phases, ranging from the VoC collection to the definition of the technical features of production/supply processes. The first phase entails the construction of the so-called House of Quality (HoQ), i.e., a planning matrix, which translates the Customer Requirements (CRs) into measurable Engineering Characteristics (ECs) of the product/service. One of the main goals of this phase is the definition of relationships between CRs and ECs, and the prioritization of these ECs, taking account of (i) their relationships with CRs and (ii) the importance of the related CRs. Given that data are collected from customers through questionnaires or interviews, both of these inputs are based on linguistic/ordinal scales. In the traditional approach, represented by the Independent Scoring Method (ISM), ordinal data are arbitrarily enriched with cardinal properties. The current scientific literature encompasses a number of alternative approaches but, even for most of them, cardinal properties are mistakenly attributed to data collected on ordinal scales. This paper proposes a method based on a consolidated ME-MCDM (Multi Expert / Multiple Criteria Decision Making) technique, which is able to perform the EC prioritization without incurring in the aforementioned issue. This method is able to aggregate data evaluated on ordinal scales, overcoming controversial assumptions of data cardinality and avoiding any arbitrary and/or artificial "scalarization" of the data. On the other hand, its application is relatively simple and intuitional, compared to other proposed approaches alternative to the ISM, which often are conceptually complicated and difficult to implement. Furthermore, the proposed method can be effectively used when both CR importances and relationship matrix coefficients are rated on different ordinal scales and, being easily automatable, it can be effortlessly integrated into existing QFD software applications. In the paper, after a general description of the theoretical principle of the method, several application examples are presented and discussed
A Planar Antenna With Voltage-Controlled Frequency Tuning Based on Few-Layer Graphene
No full textThis letter presents a voltage-controlled tunable planar antenna based on few-layer graphene flakes. The antenna consists of a rectangular patch with a shorted microstrip stub connected to the radiating edge, and a graphene pad located at the input of the stub. The proposed design exploits the variation of the graphene resistance by an applied bias voltage. Without any bias voltage, the graphene pad behaves almost as an open circuit, not allowing any current passing and, thus, voiding the impact of the stub. Increasing the bias voltage reduces the graphene resistance, thus increasing the current passing through the pad into the stub. This results in the patch antenna radiating at a different frequency. A prototype operating at the frequency of 5 GHz has been designed and tested, demonstrating a frequency tunability larger than 10% with a limited gain degradation
Robot-assisted laparoscopic pyeloplasty in a pediatric patient with horseshoe kidney: surgical technique and review of the literature
No full textVibrations prediction and measurement of multi-stage bladed disks with non linear behavior due to friction contacts
No full textThe architecture of current aircraft turbofan engines consists of multi-stage assemblies resulting from the coupling of bladed disks by means of bolted flange joints. The efficiency of such systems in real working condition is strictly related to the dynamic properties of blades and disks constituting them. According to the current design practices, blades and disks are designed so that their weights are reduced and their slenderness increased. Therefore, latest generation turbofan engine thus result much more sensible to mechanical vibrations that may cause failure by high cycle fatigue phenomena. For these reasons robust computational techniques and innovative measurement systems have become necessary tools for the design and validation of multi-stage bladed disks assemblies, in order to preserve their structural integrity while operating in real working conditions. The topics developed in this Ph.D. thesis concern aspects of linear and non-linear dynamics in the turbomachinery field and give a series of important guidelines for the study of multi-stage bladed disks systems from both a numerical and experimental point of view. The research activity has been mainly focused on the following two topics: 1. Development of reduced order model techniques for the prediction of forced response of multi-stage bladed disk assemblies. The main challenge associated with modeling multi-stage assemblies is strictly related to the possible different cyclic symmetry characterizing the coupled stages. In such case a sector representative of the whole multi-stage system does not exist in general and typical dynamic calculations based on cyclic constraints can not be performed as in the case of single bladed disks. Therefore, two novel reduced order model techniques for multi-stage systems have been developed in order to overcome the mentioned drawback while guaranteeing high fidelity in modeling the system dynamics. Furthermore, for the first time the bolted flange joint coupling two bladed disks is considered as a possible source of damping due to friction phenomena. Understanding the effects of such non-linearities in damping blade vibrations could be crucial in design of bolted flange joint. The proposed reduction techniques then also allow the prediction of the forced response of a multi-stage system when friction contacts are present at the flange joint interface while maintaining low computational costs. 2. Validation of the Blade Tip-Timing measurement technique, for the identification of the modal properties of two laboratory dummy disks. In this frame an experimental procedure to validate the Blade Tip-Timing system against the strain gauges measurement has been proposed. Furthermore, a novel methodology for the identification of the operative deflection shape of a vibrating bladed disks in presence of small mistuning has been developed
The Department of Architecture and Design of the Politecnico di Torino
No full textL'articolo illustra lo stato dell'arte dell'insegnamento dell'architettura al Politecnico di Torino, ed espone le progettualità in atto per migliorare la qualità degli spazi e della didattica, al fine di dare agli studenti una formazione al passo con i tempi e in linea con le migliori scuole di architettura del mondo
Robo-ethics design approach for cultural heritage: Case study - Robotics for museum purpose
No full textThe thesis shows the study behind the design process and the realization of the robotic solution for museum purposes called Virgil. The research started with the literature review on museums management and the critic analysis of signi cant digital experiences in the museum eld. Then, it continues analyzing the museum and its relation with the territory and the cultural heritage. From this preliminary analysis stage, signi cant issue related to museum management analysis comes out: nowadays many museum areas are not accessible to visitors because of issues related to security or architectural barriers. Make explorable these areas is one of the important topics in the cultural debate related to the visiting experience. This rst stage gave the knowledge to develop the outlines which brought to the realization of an ef cient service design then realized following robot ethical design values. One of the pillars of the robot ethical design is the necessity to involve all the stakeholders in the early project phases, for this reason, the second stage of the research was the study of the empathic relations between museum and visitors. In this phase, facilitator factors of this relation are de ned and transformed into guidelines for the product system performances. To perform this stage, it has been necessary create a relation between all the stakeholders of the project, which are: Politecnico di Torino, Tim (Telecom Italia Mobile) JOL CRAB research laboratory and Terre dei Savoia which is the association in charge of the Racconiggi's Castle, the context scenario of the research. The third stage of the research, provided the realization of a prototype of the robot, in this stage telepresence robot piloted the Museum Guide it is used to show, in real time, the inaccessible areas of the museum enriched with multimedia contents. This stage concludes with the nal test user, from the test session feedback analysis, many of people want to drive themselves the robot. To give an answer to user feedback an interactive game has been developed. The game is based both on the robot ability to be driven by the visitors and also on the capacity of the robot to be used as a platform for the digital telling. To be effective, the whole experience it has been designed and tested with the support of high school students, which are one of the categories less interested in the traditional museum visit. This experience wants to demonstrate that the conscious and ethical use of the robotic device is effectively competitive, in term of performances, with the other solutions of digital visit: because it allows a more interactive digital experience in addition to the satisfaction of the physical visit at the museum
Il monitoraggio dei parametri vocali degli insegnanti
No full textIl rumore prodotto dalle voci e dalle attività dei bambini, incrementato dall'eccessiva riverberazione nelle aule, espone gli insegnanti a rischio di eccessivo sforzo e carico vocale
Energy consumption certification of animal housing: results from the EPAnHaus project
No full textClimate control is a fundamental aspect in livestock housing, because it allows to maintain adequate indoor environmental conditions, optimize the production and assure animal welfare. Being mainly carried out by mechanical systems, climate control entails a remarkable energy consumption. Considering the expected rise of energy use in the livestock sector, the lack of information regarding this energy share and the absence of an agreed methodology for its evaluation, specific studies are required. In this paper, results of EPAnHaus project are discussed. The project final objective is the improvement of the energy performance for climate control in livestock houses by establishing an energy certification scheme. EPAnHaus project also produced a set of general and specific information regarding energy performance levels of animal houses, valuable for decision management by breeders, agricultural engineers and politicians. An exhaustive literature review, for identifying existing energy benchmark values for climate control at European level, preceded and provided the basis for the identification of a methodology to estimate the energy consumption for heating, cooling and ventilation of the houses. The chosen methodology was adopted in developing energy simulation models for different animal production (pigs, poultry), which were calibrated and validated by means of a wide dataset of acquired data. Benefits due to the adoption of innovative equipment for climate control in livestock housing (e.g. electronically commutated motor fans) have been also evaluated by the developed modeling framework, showing the effectiveness of retrofit measures. The simulation tool proved its effectiveness during the design stage of climate control setups