Preliminary study and experimental test of Peltier cells for a potential implementation in a renewable energy device

The present work focuses its attention about the need of implementation of a cooling system for photovoltaic cells. In fact the efficiency and technical lifetime is strongly affected by temperature of photovoltaic cell and this is a fundamental topic for every installation but above all in the cases of regions with a very hot climate or for concentrated photovoltaic plants. In a specific way it is proposed preliminary evaluations and study for a potential use of a thermoelectric cooling system for PV, based on Peltier cells. An overview of Peltier cells, treating about their functionality, properties and possible applications, is presented. It is performed an experimental phase, which is based on the creation of the setup and preliminary tests on Peltier cells for the next implementation in a cooling system for PV cells

The Humanities and the University in Globalization: A Question Surrounding "The University without Condition" by J. Derrida

Derrida entiende que la cuestión tecno-comunicacional se encuentra estratégicamente involucrada en la transformación actual de la condición universitaria. La universalidad de la comunicación tecnológica protagoniza, en esta perspectiva, tanto la condiciónDerrida acknowledges that the techno-communicational question is strategically involved in the current transformation of the nature of universities. From this perspective, the universality of technological communication plays a leading role both in the u

Development of a dynamic tool for aircraft noise reproduction

The aircraft is surely one of the most considerable invention that changed the transport-engineering field, since flying was already an ancient dream come true just a few years ago. Now it is really easy to reach many far places even if most people have no clue how flying is possible. However, as factories do, these large and faster and faster machines return a consistent amount of pollution every day. During take-off, engines reach the highest RPMs returning the most noise possible, and during landing, mobile surfaces produce a lot of aerodynamic disturbs releasing energy in the air while landing gears constantly produce drag in both circumstances. The need to be able to predict the sound emission of an acoustic source represents an extremely current engineering challenge: in particular, a numerical code that would let the user to listen noise produced by a flyover, since acoustic reports are just numerical statistics and spectrogram plots. In this paper, a numerical formulation is suggested for the prediction of the acoustic emission in the frequency domain. The main task of the project was to develop a program that makes dynamic analysis of the signal taking into account the source movement. Moreover, the simulations predicted the noise levels, thus explicitly accounting for the scattering acoustic effects of incidence and geometrical obstacles as well. Geometrical reflections and absorptions of certain frequencies depending on the material have been comprised in the model

Wheel – Rail interaction based on roughness calculation

Rolling noise is a relevant source in railway applications. The rolling noise is generated by the contact force the wheel, and the rail, exchange each other during relative motion. The interaction force between wheel and rail is generated by their roughness. Wheel and rail surfaces are not perfectly flat, they have a lot of small micro imperfections due to usage, damages, manufacturing. The whole of these imperfection is the roughness of the two surfaces. In the following a new interaction model will be shown where the roughness in kept in account to simulate the real case application. The model, based on previously studies, is improved introducing the rail and wheel real roughness for interaction force calculation. A real case study will be kept in account for model application and its application

Sound proofing and thermal properties of an innovative viscoelastic treatment for the turboprop aircraft fuselage

Low-resilience polyurethane foams including several additive constituents were synthesized to improve their vibro-acoustic performances, as well as the thermal insulation. viscoelastic polymer additive can attenuate vibrations and absorb sound energy. the vibro-acoustic properties of two innovative viscoelastic treatments fabricated with polyurethane foams are discussed in this paper using a typical aeronautical panel test setup. Since an aircraft insulation arrangement must provide both noise and thermal insulation for the specified operating conditions and expected thermal comfort of passengers, the thermal conductivity of the samples has been examined assuming a testing range between 20 °C (room temperature) and − 40 °C (cruise altitude). the results highlighted an optimal behavior of the novel viscoelastic foams in terms of both acoustic and thermal performance, offering a very interesting self-embedded solution with a good weight to performance ratio, compared to standard blanket composed by extra viscoelastic treatments

An Artificial Neural Network based approach for impact detection on composite panel for aerospace application

Fleet maintenance and safety aspects represent a strategic aspect in the managing of the modern aircraft fleets. The demand for efficient techniques of system and structure’s monitoring represent so a key aspect in the design of new generation aircraft. This is even more significant for composite structures that can be highly susceptible to delamination of the ply, which is often very difficult to detect externally and can lead to a dramatic reduction of design strength and service life, as a consequence of impact damage. The purpose of the work is the presentation of an innovative application within the Non Destructive Testing field based upon vibration measurements. The aim of the research has been the development of a Non Destructive Test (NDT) which meets most of the mandatory requirements for effective health monitoring systems while, at the same time, reducing as much as possible the complexity of the data analysis algorithm and the experimental acquisition instrumentation

STRUCTURAL DYNAMIC CHARACTERIZATION OF A PLATE TYPE ELEMENT ORIENTED AT ACTIVE CONTROL IMPLEMENTATION

Successful implementation of an active vibration control system is strictly correlated to the exact knowledge of the dynamic behavior of the the system, of the excitation level and spectra and of the sensor and actuator’s specification. Only the correct management of these aspects may guarantee the correct choice of the control strategy and the relative performance. Within this paper, some preliminary activities aimed at the numerical and experimental dynamic characterization of a plate type test article as well as the evaluation of piezoelectric sensors and actuators will be presented and discussed. All these information represent, in-fact, the basic information for a successive choice and implementation of the more appropriate active control strategy