1,721,175 research outputs found
Vesuvius National Park: assessment of macro and micro element contents in holm oak leaves and in soils.
No full text
On the effect of printing orientation on the surface roughness of an additive manufactured composite vertical tail
No full textAdditive manufacturing (AM) enables the production of customised and sophisticated components; Fused filament fabrication (FFF) is a widely used and cost-effective AM technique. Nevertheless, the use of FFF for aerospace and aeronautical applications is often impeded by the inadequate surface finish it imparts to the produced components. This work aims to demonstrate that, with careful calibration of process parameters and build orientation, FFF can produce aerospace components with low surface roughness. This could enable FFF to be used in aeronautics, allowing the benefits of lightweighting structures using metal replacement thermoplastics and variable infill to be exploited. In this study, rudder sections of a UAV tailplane were produced using FFF and lightened through variable internal infills, thin thicknesses, and a polymer for metal replacement. By setting different printing processes, such as infill percentage and orientation, a configuration with 10% of linear infill which results in a 97.5 g component was identified that exhibits suitable surface roughness for aerospace applications and a weight saving of approximately 50% compared to an equivalent metal volume
Metalli in traccia nel suolo e nelle foglie di Quercus ilex L. di siti a diverso grado di impatto
No full textTrasferimento di alcuni elementi nel sistema leccio-suolo ed effetti delle deposizioni atmosferiche
No full textMetal Replacement in UAV Vertical Tails Using Additive Manufacturing
No full textThe use of additive manufacturing techniques in the development of aerospace components is gaining ground. These innovative methodologies facilitate the proposal of new designs for components with weight reduced features without compromising their mechanical properties. This results in lower fuel consumption and emissions. The present paper focuses on a metal replacement process in a UAV's vertical tail, using a Design for Additive Manufacturing (DfAM) strategy and making use of the lightweight, high-strength engineering polymer known as carbon PA. By comparing the results achieved through numerical simulations conforming to certification standards between the metal and carbon PA vertical tail model, this work points out the possibility of decreasing the structural mass of the component by up to 48% while maintaining structural integrity. This reduction is achieved by matching materials, design concepts, and manufacturing capabilities
An innovative approach to a UAV tails structural design for additive manufacturing
No full textThe innovative approach used for the design and fabrication of a UAV tails through additive manufacturing (AM) completely changes the concept of designing and manufacturing products through conventional methods. AM based processes can reduces costs, lead times, and increases design freedom, allowing parts to be tailored to specific needs. A key benefit of AM processes is the ability to produce optimized designs with reduced mass and without compromising structural effectiveness. This is possible thanks to the combination of high-performance AM materials and the extraordinary manufacturing capability of AM technologies combined with an appropriate design-for-additive manufacturing (DfAM) approach, overcoming traditional manufacturing techniques. This article presents the development process of a UAV tails, based on a Design for Additive Manufacturing (DfAM) approach in order to reduce structural mass and guarantee safe operation under service loads. Therefore, by replacing the metallic component of the UAV with a techno-polymeric one, several configurations have been developed. The optimal additive configuration achieved a weight reduction of 60% compared to a metal configuration of equivalent volume, without loss of mechanical properties. In conclusion, a feasibility study of the proposed configuration was carried out by 3D printing the vertical tail redesigned. Highlights: An innovative approach by combining DfAM processes with FFF technology. Metal replacement of UAV tails with advanced technopolymers. Efficient Weight Reduction about 60% compared to metal structure. Single-piece design simplifies assembly and manufacturing. UAV redesigned tails with enhanced efficiency, adaptability, and feasibility
- …
