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RISS 인기검색어
- 검색키워드
- 저자 : Vincenzo D’Alessandro (검색결과 4 건)
- 무료
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Modelling of aluminium foam sandwich panels
Vincenzo D’Alessandro,Giuseppe Petrone,Sergio De Rosa,Francesco Franco 국제구조공학회 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
applications thanks to the excellent combination of mechanical properties, high strength and stiffness, with functional ones, thermo-acoustic isolation and vibration damping. These properties strongly depend on the density of the foam, the morphology of the pores, the type (open or closed cells) and the size of the gas bubbles enclosed in the solid material. In this paper, the vibrational performances of two classes of sandwich panels with an Alulight R foam core are studied. Experimental tests, in terms of frequency response function and modal analysis, are performed in order to investigate the effect of different percentage of porosity in the foam, as well as the effect of the random distribution of the gas bubbles. Experimental results are used as a reference for developing numerical models using finite element approach. Firstly, a sensitivity analysis is performed in order to obtain a limit-but-bounded dynamic response, modelling the foam core as a homogeneous one. The experimental-numerical correlation is evaluated in terms of natural frequencies and mode shapes. Afterwards, an update of the previous numerical model is presented, in which the core is not longer modelled as homogeneous. Mass and stiffness are randomly distributed in the core volume, exploring the space of the eigenvectors.
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Modelling of aluminium foam sandwich panels
D'Alessandro, Vincenzo,Petrone, Giuseppe,De Rosa, Sergio,Franco, Francesco Techno-Press 2014 Smart Structures and Systems, An International Jou Vol.13 No.4
Aluminium Foam Sandwich (AFS) panels are becoming always more attractive in transportation applications thanks to the excellent combination of mechanical properties, high strength and stiffness, with functional ones, thermo-acoustic isolation and vibration damping. These properties strongly depend on the density of the foam, the morphology of the pores, the type (open or closed cells) and the size of the gas bubbles enclosed in the solid material. In this paper, the vibrational performances of two classes of sandwich panels with an Alulight(R) foam core are studied. Experimental tests, in terms of frequency response function and modal analysis, are performed in order to investigate the effect of different percentage of porosity in the foam, as well as the effect of the random distribution of the gas bubbles. Experimental results are used as a reference for developing numerical models using finite element approach. Firstly, a sensitivity analysis is performed in order to obtain a limit-but-bounded dynamic response, modelling the foam core as a homogeneous one. The experimental-numerical correlation is evaluated in terms of natural frequencies and mode shapes. Afterwards, an update of the previous numerical model is presented, in which the core is not longer modelled as homogeneous. Mass and stiffness are randomly distributed in the core volume, exploring the space of the eigenvectors.
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Sloshing cargo in silo vehicles
Florian Fleissner,Vincenzo D´Alessandro,Werner Schiehlen,Peter Eberhard 대한기계학회 2009 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.23 No.4
The driving stability of silo vehicles is significantly affected by the type of cargo that is transported and the design of the tank. Cargo motion can have both beneficial and negative aspects in terms of driving stability and braking performance. Neglecting the influence of the dynamically moving cargo in driving simulations of silo vehicles leads to significant errors in the simulation results. We propose a new method for the dynamic simulation of silo vehicles carrying granulates. The method couples Lagrangian particle methods, such as the discrete element method, and multibody systems methods using co-simulations. We demonstrate the capability of the new approach by providing simulation results of two benchmark maneuvers.
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Thermal management solutions for a lightweight 3L GaN inverter
Roberto Trani,Antonio Pio Catalano,Alberto Castellazzi,Vincenzo d’Alessandro 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper presents a comparative study of different approaches and solutions to the cooling of new type highly compact flat packages for gallium nitride (GaN) transistors. The focus here is on an inverter intended for hybrid and full-electric transport applications, where optimization of the gravimetric power density is paramount. As a case-study, a 3-level active neutral point clamped (aNPC) bi-directional inverter-rectifier topology is considered. The outcomes of the investigation are manifold: optimum design of thermal vias is considered; it is highlighted that the use of a graphene layer just underneath the chip can help reduce the temperature gradient between chip and PCB and can also improve heat-conduction in subsequent layers of the assembly, by enabling a better exploitation of lateral heat-flow possibilities, too; the benefit of using a soldered DCB substrate to assist heat removal from the vias towards the heat-sink is quantified for different materials of the insulating layer (ceramic).
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