1,721,028 research outputs found
Towards a formalized model-based process for the design of high-speed aircraft and related subsystems
Full text linkIncreasing complexity associated to advanced aircraft concepts for high-speed flight is pushing the limit of engineering practices concerning design phases of products lifecycle. Specific methodologies aimed at managing requirements over the entire vehicle architecture definition shall then be properly formalized and supported by means of standardized processes and languages in order to be effective. The approaches suggested by the Systems Engineering practices, especially when considering the model-based environments as main tools for systems design, can be exploited to face this challenges, if properly tailored to suit the specific engineering field considered. This paper aims at proposing a model-based process for the design of high-speed aircraft exploiting a formalized methodology and the typical tools of Systems Engineering. A conceptual design exercise, based on the STRATOFLY MR3 hypersonic cruiser case study, is performed from high-level stakeholders objectives to vehicle performance estimations, passing through functional and interface analyses. Additionally, some insights concerning on-board subsystems sizing activities are provided in terms of integration within the high-level design process. The whole work highlights the capability of performing a seamless requirements management and development within the design procedure, particularly focusing on the relationships among the different stages of the workflow
Innovative Model Based Systems Engineering approach for the design of hypersonic transportation systems
Full text linkL'abstract è presente nell'allegato / the abstract is in the attachmen
Progettazione di sistemi complessi tramite il ‘Systems Engineering' e interoperabilità tra modelli funzionali e numerici
Full text linkLa crescente richiesta del mercato verso prodotti intelligenti, capaci di adattarsi autonomamente a condizioni di esercizio variabili, motiva l'incremento di complessità di molti sistemi. Il ‘Systems Engineering' si propone come efficace metodologia per affrontare il problema dello sviluppo e della gestione di sistemi complessi. I modelli che introduce si soffermano, infatti, sull'analisi dei requisiti e degli scenari operativi e sulla preliminare definizione di blocchi funzionali e di architetture del sistema che prescindono dai componenti utilizzabili, per permettere un'ottimizzazione della configurazione. Questo lavoro propone una panoramica del metodo applicato a due casi, di ambito meccatronico e aeronautico, esponendo come le attività di modellazione numerica e funzionale si integrano tra loro, anche a livello di software, per raggiungere la cosiddetta interoperabilità tra strumenti di lavor
Conceptual design methodology for low-supersonic LH2-powered passengers aircraft
No full textCommercial aviation domain has always been characterized by a constant technological evolution, featuring different progress slopes depending on the historical period, but still focused on the development of more efficient and competitive products. More recently, the concept of competitiveness has changed, moving from a pure performance standpoint to a wider concept, encompassing economic viability and environmental sustainability. The latter is crucial and cannot be neglected anymore, even for a sector that is contributing to manmade CO2 emissions only by 2-4%. The need to assess the overall product lifecycle in terms of environment compatibility is thus influencing new design for conventional aircraft, with particular focus on Sustainable Aviation Fuels (SAF) and hydrogen. However, this shall not limit technological progress, which is basically stuck around jet airliners configuration concepts originally developed around 1950s. As a matter of fact, still maintaining the need of environmental compatibility, supersonic and, in general, high-speed aviation has regained momentum in terms of research efforts and funding, after some period characterized by highs and lows since the withdrawn from service of the Concorde. This paper aims at evaluating the possibility of designing a liquid hydrogen-powered aircraft aimed at passengers transportation, flying in low supersonic regime along trans-Atlantic routes, with particular focus on the feasibility of Concorde-like configurations modified to host liquid hydrogen on-board. Particularly, a conceptual design methodology is described and results are discussed to highlight limitations of such kind of aircraft layout, when non drop-in fuels are exploited
Impact of the Model Based Systems Engineering on the design of a mechatronic flywheel-based energy storage system
No full textThe design of a flywheel system for energy storage is herein performed through the MBSE as an example of mechatronic product development and innovation. Some relevant advantages of the MBSE applied to a material mechatronic system, in some activities as the requirement analysis, the identification of system capabilities, the definition of architecture and the system validation are identified. Moreover, the paper is aimed at investigating some critical issues arising when the MBSE tools are applied to machine design, being still a domain poorly inclined to exploit this holistic approach. That trend might be related to technical difficulties in assessing an interoperable framework of simulators aimed at dealing simultaneously with functional and physical models. In addition the technology scouting looks poorly connected within the standard SysML diagrams, without introducing some additional charts. A demonstration of the fruitful impact of the MBSE on the machine design is herein proposed, to show some advantages provided as a mechatronic integrated system is conceived and how a complete risk analysis could be based on a dysfunctional analysis supported by the MBSE modeling activit
Preliminary Design and Simulation of a Thermal Management System with Integrated Secondary Power Generation Capability for a Mach 8 Aircraft Concept Exploiting Liquid Hydrogen
Full text linkThis paper introduces the concept of a thermal management system (TMS) with integrated on-board power generation capabilities for a Mach 8 hypersonic aircraft powered by liquid hydrogen (LH2). This work, developed within the EU-funded STRATOFLY Project, aims to demonstrate an
opportunity for facing the challenges of hypersonic flight for civil applications, mainly dealing with thermal and environmental control, as well as propellant distribution and on-board power generation, adopting a highly integrated plant characterized by a multi-functional architecture.
The TMS concept described in this paper makes benefit of the connection between the propellant storage and distribution subsystems of the aircraft to exploit hydrogen vapors and liquid flow as the means to drive a thermodynamic cycle able, on one hand, to ensure engine feed and thermal
control of the cabin environment, while providing, on the other hand, the necessary power for other on-board systems and utilities, especially during the operation of high-speed propulsion plants, which cannot host traditional generators. The system layout, inspired by concepts studied within
precursor EU-funded projects, is detailed and modified in order to suggest an operable solution that can be installed on-board the reference aircraft, with focus on those interfaces impacting its performance requirements and integration features as part of the overall systems architecture of
the plane. Analysis and modeling of the system is performed, and the main results in terms of performance along the reference mission profile are discussed
Model-Based Design of Complex Aeronautical Systems Through Digital Twin and Thread Concepts
Full text linkManaging the lifecycle of the elements of a complexand safety-critical system, from conceptual design to support in operation, is still a relevant challenge in the industrial domain. Starting
from research and engineering activities, up to production and delivery, the need of maintaining the trace of dependence, changes, and possible updates regarding the final product is a crucial aspect for success. Particularly, conceptual and preliminary design activities are affected by a high level of uncertainty and a certain degree of project instability, usually caused by the need to explore alternative solutions and variants. Different tasks are performed concerning the identification of system requirements, functional and physical behavior using model-based design (MBD), and model-based systems engineering, which, generally, are subjected to extensive trade studies aimed at identifying the best solution. In this context, this paper presents how model-based digital twin and threads concepts will likely change the way in which the MBD process is managed, overcoming the issues associated with federated IT infrastructures and with tools integration. Notably, lifecycle and nonlifecycle related interoperability aspects are described, with particular focus on the exploitation of standards for lifecycle collaboration and heterogeneous simulation. The design of an ice protection system for a regional aircraft is selected as case study, starting from the work performed by the authors within the EC-funded research project CRYSTA
Cabin Escape System: a way to ensure crew safety during suborbital flights
No full textThis paper deals with the conceptual design of a cabin escape system to be implemented on a spaceplane aimed at performing suborbital parabolic flights. After the explanation of the reasons why an escape system is so interesting for this type of vehicle, a design methodology and the related support tool-chain are proposed and applied to the definition of an escape system for a Single Stage suborbital transportation system taken as reference case study. During this process, specific attention is paid to the impact of onboard systems integration on the architecture and to the sizing of the escape system and of the entire vehicle. Furthermore, the possibility of exploiting this system during the different phases of the mission have been evaluated and eventually, a preliminary impact risk analysis is reporte
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