| 1. |
- Munjulury, Raghu Chaitanya, et al.
(författare)
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A comprehensive computational multidisciplinary design optimization approach for a tidal power plant turbine
- 2017
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Ingår i: Advances in Mechanical Engineering. - London : Sage Publications. - 1687-8132 .- 1687-8140. ; 9:3, s. 1-13
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Tidskriftsartikel (refereegranskat)abstract
- Multidisciplinary design optimization has become a powerful technique to facilitate continuous improvement of complex and multidisciplinary products. Parametric modeling is an essential part with tremendous impact on the flexibility and robustness of multidisciplinary design optimization. This article investigates the effect of relational and non-relational parameterization techniques on the robustness and flexibility of the conceptual design of a multidisciplinary product. Bench marking between relational and non-relational parameterization and their effect on flexibility and robustness indicate that the relational parameterization is an efficient method in the multidisciplinary design optimization process. The inherent properties of the method contribute to an efficient parametric modeling with improved communication between different disciplines. This enhances the performance of the multidisciplinary design optimization process and allows a more flexible and robust design. The considered disciplines are computer-aided design, computational fluid dynamics, finite element analysis, and dynamic simulation. A high-fidelity geometry created in a computer-aided design environment is computer-aided design centric approach and later used in computational fluid dynamics, finite element analysis for a better understanding of the product as it leads to precise outcomes. The proposed approach is implemented for the conceptual design of a novel product, a tidal power plant developed by Minesto AB using a multidisciplinary design optimization process.
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| 2. |
- Safavi, Edris, 1982-, et al.
(författare)
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A Collaborative Tool for Conceptual Aircraft Systems Design
- 2012
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Ingår i: Guidance, Navigation, and Control and Co-located Conferences. - Reston, VA, USA : American Institute of Aeronautics and Astronautics. - 9781624101830 ; , s. 1-10
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Konferensbidrag (refereegranskat)abstract
- Advances in recent years has brought forth many feasible technologies which oer signif-icant design advantages over the traditional aircraft vehicle ight systems. These advanceshave brought about a need for the aircraft conceptual engineers to evaluate these newtechnologies so as to realize a realistic and optimized architecture which fulls all criti-cal disciplinary requirements. To evaluate these systems, it is necessary to use models ofcomplexity which are a degree higher than what is being used today. Quick developmentand evaluation of these models can be a hard task for an engineer to achieve consideringthe multidisciplinary nature of the systems. A collaborative eort in model developmentbetween various department is needed if the conceptual design is to be completed withinthe time frame. To facilitate a collaborative conceptual design a research project was for-malized at Linkoping university, which has led to the development of a tool named CAVE(Conceptual Aircraft Vehicle Engineering) which can be used to evaluate the architectureof aircraft systems. In this paper, CAVE as a conceptual design tool will be presented.
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| 3. |
- Safavi, Edris, et al.
(författare)
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Aspects on a Digitalized Industrialization Process : Are There Challenges to Overcome?
- 2021
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Ingår i: Transdisciplinary Engineering for Resilience: Responding to System Disruptions. - Amsterdam : IOS Press. - 9781643682082 - 9781643682099 ; , s. 253-262
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Konferensbidrag (refereegranskat)abstract
- Increased possibilities to utilize digital tools in the industrialization process where a product move from conceptualization toward mass production is challenged with how to develop resilience in such process. Several digital tools such as CAD, CAE, Production flow analysis, assembly analysis, and off-line programming of robots and CNC machines are commonly used in industry for both product development and production. There are also many good initiatives such as computational multidisciplinary design optimization or design automation in the aircraft industry to integrate such digital tools and increase the efficiency of the generating and distributing of information. However to maximize the benefit of digitalization, a fully digitalized platform is required where all parties including the product development team, manufacturing resources, suppliers, and even customers can contribute efficiently. Although establishing such a digitilized platform seems very promising, it confronts many challenges in a large firm. Hence, this paper, based on a theoretical outlook related to industrial observations, will explore challenges and opportunities related to the digitalization of product development and the manufacturing process.
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| 4. |
- Safavi, Edris
(författare)
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Collaborative Multidisciplinary Design Optimization : A Framework Applied on Aircraft Systems and Industrial Robots
- 2013
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Licentiatavhandling (övrigt vetenskapligt/konstnärligt)abstract
- In a product development process, it is crucial to understand and evaluate multiple and synergic aspects of systems such as performance, cost, reliability and safety. In order to improve the foundations for decision-making, this thesis presents methods that are intended to increase the engineering knowledge in the early design phases.In complex products, different systems from a multitude of engineering disciplines have to work tightly together. Collaborative design is defined as a process where a product is designed through the collective and joint efforts of domain experts. Thus, a Collaborative Multidisciplinary Design Optimization (CMDO) process is proposed in the conceptual design phase in order to increase the likelihood of more accurate decisions being taken early on.To enable higher fidelity based CMDO, it is necessary to validate the tools and models utilized. This can be done with so-called low cost demonstrators. The physical demonstrators increase the engineer’s confidence regarding the final product by validating the models as well as revealing many unknowns and thus further increasing the engineering knowledge.The performance of the presented methods is demonstrated with two industrial applications, aircraft conceptual system design and industrial robot design.
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| 5. |
- Safavi, Edris, et al.
(författare)
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Collaborative multidisciplinary design optimization: A framework applied on aircraft conceptual system design
- 2015
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Ingår i: Concurrent Engineering - Research and Applications. - : Sage Publications. - 1063-293X .- 1531-2003. ; 23:3, s. 236-249
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Tidskriftsartikel (refereegranskat)abstract
- In a product development process, it is crucial to understand and evaluate multiple and synergic aspects of systems such as performance, cost, reliability, and safety. These aspects are mainly considered during later stages of the design process. However, in order to improve the foundations for decision-making, this article presents methods that are intended to increase the engineering knowledge in the early design phases. In complex products, different systems from a multitude of engineering disciplines have to work tightly together. Collaborative design is described as a process where a product is designed through the collective and joint efforts of domain experts. A collaborative multidisciplinary design optimization process is therefore proposed in the conceptual design phase in order to increase the likelihood of more accurate decisions being taken early on. The performance of the presented framework is demonstrated in an industrial application to design aircraft systems in the conceptual phase.
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| 6. |
- Safavi, Edris
(författare)
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Collaborative Multidisciplinary Design Optimization for Conceptual Design of Complex Products
- 2016
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- MULTIDESCIPLINARY design optimization (MDO) has developed in theory andpractice during the last three decades with the aim of optimizing complexproducts as well as cutting costs and product development time. Despite thisdevelopment, the implementation of such a method in industry is still a challenge andmany complex products suffer time and cost overruns.Employing higher fidelity models (HFMs) in conceptual design, one of the early and most important phases in the design process, can play an important role in increasing the knowledge base regarding the concept under evaluation. However, design space in the presence of HFMs could significantly be expanded. MDO has proven to be an important tool for searching the design space and finding optimal solutions. This leads to a reduction in the number of design iterations later in the design process, with wiser and more robust decisions made early in the design process to rely on.In complex products, different systems from a multitude of engineering disciplines have to work tightly together. This stresses the importance of evolving various domain experts in the design process to improve the design from diverse engineering perspectives. Involving more engineers in the design process early on raises the challenges of collaboration, known to be an important barrier to MDO implementation in industry. Another barrier is the unavailability and lack of MDO experts in industry; those who understand the MDO process and know the implementation tasks involved.In an endeavor to address the mentioned implementation challenges, a novel collaborative multidisciplinary design optimization (CMDO) framework is defined in order to be applied in the conceptual design phase. CMDO provides a platform where many engineers team up to increase the likelihood of more accurate decisions being taken early on. The structured way to define the engineering responsibilities and tasks involved in MDO helps to facilitate the implementation process.It will be further elaborated that educating active engineers with MDO knowledge is an expensive and time-consuming process for industries. Therefore, a guideline for CMDO implementation in conceptual design is proposed in this thesis that can be easily followed by design engineers with limited prior knowledge in MDO. The performance of the framework is evaluated in a number of case studies, including applications such as aircraft design and the design of a tidal water power plant, and by engineers in industry and student groups in academia.
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| 7. |
- Safavi, Edris, 1982-, et al.
(författare)
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Conceptual Optimization of Aircraft Actuator Systems
- 2012
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Ingår i: Proceedings of the International Conference on recent advances in aerospace actuation systems and components. - Toulouse, France : Institut national des sciences appliquées. - 9782876490628 - 2876490625 ; , s. 201-
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Konferensbidrag (övrigt vetenskapligt/konstnärligt)abstract
- The aim of this research project is to identify a preliminary architecture of a flight control actuation system concept for energy optimized aircraft system architecture with the focus on more electrical aircraft. At Linköping University a design framework is being developed to assist in the evaluation of aircraft flight system at a conceptual level using dynamic models which has led to the development of a tool named CAVE.In this paper the use of the framework to approach the problem of finding a suitable flight actuator system for a number of flight control surfaces distributed over the aircraft with different boundary conditions (maximum torque and flap deflection) is presented. Dynamic models for three of the most commonly used actuation technologies have been developed in Dymola and each system has been optimized with mass and energy consumption as the objectives.
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| 8. |
- Safavi, Edris, 1982-, et al.
(författare)
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Design and Evaluation of Airborne Wind Turbine Utilizing Physical Prototype
- 2013. - 1
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Ingår i: International Congress on Energy Efficiency and Energy Related Materials (ENEFM2013). - Cham : Springer. - 9783319055206 - 9783319055213 ; , s. 57-64
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Bokkapitel (övrigt vetenskapligt/konstnärligt)abstract
- Moving towards renewable sources of energy has become one of the most important energy-related strategies in recent decades. High-altitude wind power (HAWP) has been discovered in 1833 as a source of useful energy. Wind power density (Watts/m2) can significantly increase (~6 times) by going from 80 to 500 m altirude The global capacity of 380 TW (terawau) as well as abundance, strength, and relative persistency of wind in higher altitude are eye-catch ing poinls to consider HAWP as a reliable energy source in the future. A research project called "THOR" has been initiated at Linköping University by a group of master students (soon to graduate) as proof of concept of airborne wind energy (AWES). THOR is about feasibility analysis of different concepts of HAWP and proof of concept of balloon based AWES as one of the appropriate existing concepts. THOR is intended to be a research platform at Linköping University for further development of AWES concepts i n future.
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| 9. |
- Safavi, Edris, et al.
(författare)
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Implementation of collaborative multidisciplinary design optimization for conceptual design of a complex engineering product
- 2016
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Ingår i: Concurrent Engineering - Research and Applications. - : Sage Publications. - 1063-293X .- 1531-2003. ; 24:3, s. 251-265
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Tidskriftsartikel (refereegranskat)abstract
- This study investigates the performance of the collaborative multidisciplinary design optimization framework and how it facilitates the knowledge integration process. The framework is used to design and optimize an innovative concept of a tidal water power plant. The case study helps to highlight the challenges that may occur during implementation. The result is presented as a modified framework with less implementation difficulties. The improved framework shows significant reduction in design time and improvement in collaborative design optimization for a design team. The geometry of the product is optimized to minimize weight and maximize the power generated by the turbine with respect to some mechanical constraints.
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| 10. |
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