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Explicit matrices for a composite beam-column with refined zigzag kinematics
No full textThis paper presents explicit expressions of the linear and geometric stiffness matrix, as well as the mass matrix and vector of equivalent nodal forces for a simple planar beam finite element based on the Refined Zigzag Theory. After a brief review of the theory, the matrices are derived via Hamilton's principle and special anisoparametric (interdependent) shape functions. The C0-continuous element shows remarkable accuracy in the analysis of composite laminated or sandwich beams and for particular structures with partial interaction of two or more subcomponents with interlayer slip
Review of "The Empty Place: Democracy and Public Space" by Teresa Hoskyns
No full textThe relationship of public space to democracy is dominated by two competing, yet intertwined, theoretical bases: political philosophy and spatial theory. But how does the architect make political space? Can architectural practice create political space through design? In this book, Teresa Hoskyns theorizes that the converging point between theoretical foundations and democratic practices is "participation" within "social production of space." Therefore, "participation" from joint perspectives of architecture and political philosophy has been studied in two different frameworks: the theoretical and the practical. Unlike most previous works on the relationship between architecture and democracy, Hoskyn's book transcends the spatial and political interpretation of public space. By incorporating new theoretical approaches to representative democracy, it depicts a complex dialectic and multilayered picture of—"spaces of democracy" and the "democracy of space"—in her phrasing
Approach to technology prioritization in support of moon initiatives in the framework of ESA exploration technology roadmaps
No full textPreliminary design of a cabin escape system for a suborbital vehicle aimed at parabolic flights
No full textPreliminary vibroacoustic analysis about the use of metamaterials in the fuselage of a regional turboprop aircraft
No full textReduction of the EMI in BLDC Motor Drives Based on Delay Compensation
No full textThe continues efforts to obtain better performance from power switching circuits as well as reduced size has led to higher switching frequencies, but this has played against the reduction of the electromagnetic pollution they generate [1]. Usually, such kind of problems are addressed including filters, EM shields but also modulating the control signals in the attempt of spreading the interference energy over a wider frequency range. This is usually implemented referring to the spread spectrum technique [2]. This work aims to address the reduction of the EMI delivered by motor drives by a different approach based on the switching edges ' alignment. To this purpose, the system shown in Fig. 1 is considered. It is made up of a three phase inverter driving a BLDC motor and connected to two LISN. The BLDC motor is driven by three trapezoidal waveforms, displaced in phase by 120°, as shown in Fig. 2. Only two legs a time drive the motor, since the rising and the falling edges of the waveforms in Fig. 2 (dashed line) results from keeping the corresponding leg off [3]. The voltage average value is controlled by the duty cycle of the bipolar PWM, which drives the two active legs. In principle, active node voltages should be complementary but actually it is not because of uncontrolled circuit delay, such as those introduced by the MOS drivers. This causes the interference current to flow through the common mode loop, meaning through the LISNs, as shown in Fig.4. Based on that, if the delay is zeroed intentionally, the common mode EM emission can be attenuated [4][5]. The proposed approach has been checked performing SPICE simulations at first. Two configurations have been compared: the first one with the switching output voltages showing a phase shift of 100ns, and the second one with the phase shift almost zeroed. The results of these analyses proving the correctness of what presented so far are shown in Fig. 3. Afterwards, a BLDC driver was designed and prototyped. The three-phase bridge was controlled by a microcontroller that allows one performing a fine adjustment of the PWM duty cycle and phase. The control signals are provided to the full bridge by means of fiber optics, as shown in Fig. 5. The spectra measured are shown in Fig. 6. From these measurements, it has turned out that with the control signals properly phased, the conducted emissions are lowered by 10-15 dB. In conclusion, the investigations carried out within this work have shown that the common mode conducted emissions of three phase BLDC motor drives can be mitigated by compensating the delay introduced by the MOS drivers and the parasitic elements of the test board
The role of intangible aspects in conservation and promotion strategies of Matera and its surrounding territory
No full textIn the past, only material structures were considered as heritage. Recently, thanks to the UNESCO Convention for the Safeguarding of the Intangible Cultural Heritage (2003) this concept - previously considered, even if not explicitly developed, in the Nara Document of Authenticity (1994) - enlarged its scope to include the intangible heritage. Thus, also the practices, representations, expressions, knowledge, skills - as well as the instruments, objects, artifacts and cultural spaces associated - start to be defined and protected as heritage. According to these issues, what is the role of the intangible in the growing recognition of the values of a Site? How does it affect the definition of new boundaries of Cultural Sites? The paper aims at developing these issues through the case study of the Sassi of Matera, in Southern Italy, declared UNESCO site in 1993 for its unique urban environment in which people used to live in almost total symbiosis with nature, taking advantage of every possible resource in a smart and sustainable manner. Furthermore, the city of Matera, has been recently appointed as European Capital of Culture for 2019. Presenting the last initiatives on conservation and promotion of heritage, in preparation of the 2019 event, it will be outlined the relationship between the tangible and intangible aspects in the value assessment of this heritage site. Through a series of examples, it will be presented how cultural spaces as well as intangible aspects play a key role in the broadening of heritage's boundaries and, as a consequence, in the conservation and promotion initiatives
Feasibility study of managed pressure drilling application for overcoming problems faced in conventional drilling practices in mature oilfields: case study Mansouri oilfield, southwest Iran
No full textGestione operativa di pressioni e portate di fluido in pozzo durante la perforazione petrolifera. Straordinaria gestione ed amministrazion
