Download or read book Integrating Automated Multi Disciplinary Optimization in Preliminary Design of Non Traditional Aircraft written by Mehmet Fidanci and published by . This book was released on 2000-03-01 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current methods of aircraft conceptual design lack the ability to quickly generate detailed analysis, particularly of nontraditional designs such as blended wing body craft. This study developed a method to resolve this problem by creating a flexible, parametrically driven conceptual model in an object-oriented, adaptive modeling environment from which analysis and optimization may rapidly be performed. These object-oriented techniques are incorporated into a traditional conceptual design process. All objects inherit dependency-tracking and demand-driven calculations. Design Analysis was performed within the modeling language and utilized interfaces to other software packages. A detailed mesh, suitable for input into finite element analysis programs, was developed from the less detailed, geometric mesh created by the modeling program. The output from finite element analysis forms the basis for rapid changes in subsequent iterations of the design process. The demonstration focuses on a single parametric design model which transforms a conventional transport design into a blended wing body design. This single design is controlled by a limited - set of geometric variables and produces optimal structural weight estimations while the designer addresses volumetric and cost requirements.

Download or read book Integrating Automated Multi Disciplinary Optimization in Preliminary Design of Non Traditional Aircraft written by Mehmet Fidanci and published by . This book was released on 2000 with total page 224 pages. Available in PDF, EPUB and Kindle. Book excerpt: Current methods of aircraft conceptual design lack the ability to quickly generate detailed analysis, particularly of nontraditional designs such as blended wing body craft. This study developed a method to resolve this problem by creating a flexible, parametrically driven conceptual model in an object-oriented, adaptive modeling environment from which analysis and optimization may rapidly be performed. These object-oriented techniques are incorporated into a traditional conceptual design process. All objects inherit dependency-tracking and demand-driven calculations. Design Analysis was performed within the modeling language and utilized interfaces to other software packages. A detailed mesh, suitable for input into finite element analysis programs, was developed from the less detailed, geometric mesh created by the modeling program. The output from finite element analysis forms the basis for rapid changes in subsequent iterations of the design process. The demonstration focuses on a single parametric design model which transforms a conventional transport design into a blended wing body design. This single design is controlled by a limited - set of geometric variables and produces optimal structural weight estimations while the designer addresses volumetric and cost requirements.

Download or read book A Multidisciplinary Optimization Framework for Flight Dynamics and Control Integration in Aircraft Design written by Ruben Eduardo Perez and published by . This book was released on 2007 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: The emerging fly-by-wire and fly-by-light technologies increase the possibility of producing aircraft with excellent handling qualities and increased performance across the flight envelope. As a result, flight dynamics and control have become an important discipline in the design of air vehicles; where it is desired to take into account the dynamic characteristics and automatic control capabilities at the earliest stages of design. Traditionally, very limited considerations have been made at the early conceptual stage regarding this discipline. Some simplified methodologies used to size the control surfaces (i.e. horizontal and vertical tail surfaces) result in sub-optimal designs due to their inability to capture the interactions among the sizing of control surfaces, their control effectors (i.e. elevator and rudder) and it systems, and their effect on the general dynamic behaviour of the aircraft. Such designs have great limitations on control and handling, which lead to costly design modifications at the later stages of design. This research presents a methodology that enables flight dynamics and control integration at the conceptual design stage using multidisciplinary design optimization. It finds feasible aircraft configurations which meet specified mission requirements concurrently with the stability, control, and handling quality requirements at multiple flight conditions within the flight envelope. Furthermore, the proposed methodology exploits two different control integration strategies. The first one allows for individualized control system design at each flight phase, while the second one focuses on simultaneous stabilization and optimization using one single controller. The application of the methodology leads to designs that exploit active control interactions and have better performance and flying characteristics than the traditional sizing process over a broad range of aircraft sizes.

Download or read book Optimization Methods Applied to the preliminary design of innovative non conventional aircraft configurations written by Emanuele Rizzo and published by Emanuele Rizzo. This book was released on 2009 with total page 172 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Multidisciplinary Design Analysis and Optimization Tool Development Using a Genetic Algorithm written by Nasa Technical Reports Server (Ntrs) and published by BiblioGov. This book was released on 2013-06 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multidisciplinary design, analysis, and optimization using a genetic algorithm is being developed at the National Aeronautics and Space Administration Dryden Flight Research Center (Edwards, California) to automate analysis and design process by leveraging existing tools to enable true multidisciplinary optimization in the preliminary design stage of subsonic, transonic, supersonic, and hypersonic aircraft. This is a promising technology, but faces many challenges in large-scale, real-world application. This report describes current approaches, recent results, and challenges for multidisciplinary design, analysis, and optimization as demonstrated by experience with the Ikhana fire pod design.

Download or read book Multidisciplinary Design Analysis and Optimization of Aerospace Composites written by Charles Lu and published by SAE International. This book was released on 2019-04-30 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multidisciplinary Design and Optimization of Aerospace Composite Materials is a collection of ten SAE technical papers focusing on the design analysis of aerospace composite structures from the perspective of various disciplines. The book concentrates on the following aspects: • Analytical methods for weight design of aircraft structures, including a parametric geometry model capable of generating dedicated models for both aerodynamic and structural solvers. • Methodologies for evaluating the structural performance of carbon/epoxy composite panels. • An aerodynamic design of flexible wings made of composite structures. • Thermal design and analysis of composite enclosures. • Methodologies for analyzing the acoustic performance of composite structures, including the design optimization method to evaluate the acoustic performance in terms of transmission loss (TL) of various composite panels. • The lightening effect on composites, presenting a theoretical method to compute the electrical current propagating through composite structures due to lightning strikes. • The issue of fire resistance as most polymer resins are flammable once the respective ignition temperatures are reached. • A probabilistic-based reliability analysis of the composite structures. The method is demonstrated on a graphite/epoxy composite space habitat subjected to the debris attacks. • A sustainability analysis of aircraft composite materials, including improved durability, less maintenance, and lower energy consumption.

Download or read book Multidisciplinary Design Optimization written by Natalia M. Alexandrov and published by SIAM. This book was released on 1997-01-01 with total page 476 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multidisciplinary design optimization (MDO) has recently emerged as a field of research and practice that brings together many previously disjointed disciplines and tools of engineering and mathematics. MDO can be described as a technology, environment, or methodology for the design of complex, coupled engineering systems, such as aircraft, automobiles, and other mechanisms, the behavior of which is determined by interacting subsystems.

Download or read book Simulation Driven Modeling and Optimization written by Slawomir Koziel and published by Springer. This book was released on 2016-02-12 with total page 405 pages. Available in PDF, EPUB and Kindle. Book excerpt: This edited volume is devoted to the now-ubiquitous use of computational models across most disciplines of engineering and science, led by a trio of world-renowned researchers in the field. Focused on recent advances of modeling and optimization techniques aimed at handling computationally-expensive engineering problems involving simulation models, this book will be an invaluable resource for specialists (engineers, researchers, graduate students) working in areas as diverse as electrical engineering, mechanical and structural engineering, civil engineering, industrial engineering, hydrodynamics, aerospace engineering, microwave and antenna engineering, ocean science and climate modeling, and the automotive industry, where design processes are heavily based on CPU-heavy computer simulations. Various techniques, such as knowledge-based optimization, adjoint sensitivity techniques, and fast replacement models (to name just a few) are explored in-depth along with an array of the latest techniques to optimize the efficiency of the simulation-driven design process. High-fidelity simulation models allow for accurate evaluations of the devices and systems, which is critical in the design process, especially to avoid costly prototyping stages. Despite this and other advantages, the use of simulation tools in the design process is quite challenging due to associated high computational cost. The steady increase of available computational resources does not always translate into the shortening of the design cycle because of the growing demand for higher accuracy and necessity to simulate larger and more complex systems. For this reason, automated simulation-driven design—while highly desirable—is difficult when using conventional numerical optimization routines which normally require a large number of system simulations, each one already expensive.

Download or read book Integrating Air Systems in Aircraft Multidisciplinary Design Optimization written by Ali Tfaily and published by . This book was released on 2018 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: "The strong interactions between aircraft and air systems necessitate the integration of the latter to multidisciplinary design optimization (MDO) considerations of the former. This research presents such a methodology considering environmental control and ice protection systems. These systems consume pressurized bleed air from the aircraft's engines to perform their respective functions. We first describe the models used to predict the behavior of these systems and then propose different approaches to their integration into an existing aircraft MDO environment. A business jet test case was studied using the developed methodology. The comparison of MDO results obtained with and without the considered air systems demonstrate the impact on optimal aircraft design and confirm the importance of integrating air systems in the aircraft MDO environment in early design stages." --

Download or read book High fidelity Multidisciplinary Design Using an Integrated Design Environment written by Antony Jameson and published by . This book was released on 2007 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main objectives of the research was to further develop the necessary fundamental algorithms to enable high fidelity multi-disciplinary design of complete aircraft configurations. The work was focused on four main areas: (1) Flow solution algorithms for unstructured meshes, (2) Aero-structural plan-form optimization, (3) Multi-fidelity approach to multi-disciplinary design of supersonic aircraft. (4) Algorithms for automatic feedback control of aerodynamic flows.

Download or read book Effective Multiobjective MDO for Conceptual Design An Aircraft Design Perspective written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Once the requirements for a new aircraft have been defined, the Conceptual design phase is launched. During this phase one or more designers have the goal of defining and investigating a number of alternative solutions. Through discussion with industry it has become apparent that optimisation tools are seldom used, even though these could greatly enhance the work of the designers. The objective of the work carried forward has been of identifying, comparing and where necessary improving the most suitable techniques, as well as schemes for their integration, in order to perform effectively Multidisciplinary Design and Optimisation (MDO) in the Conceptual phase of the aircraft design. The techniques that have been investigated include: multi-objective optimisation algorithms, MDO algorithms for treating non-hierarchically decomposable systems and Automatic Differentiation (AD). As a result an algorithm for performing multiobjective MDO has been developed. Given a complete model for a complex non-hierarchically decomposable system and given a number of objectives and constraints, the algorithm is capable of determining a set of well distributed solutions, representative of both local and global Pareto frontiers. A number of test cases have been used for evaluating the alternative methodologies and the proposed algorithm. These include a set of complex algebraic test cases typically used for evaluating global optimisation algorithms and a simplified aircraft conceptual design model, which was provided by industry. The results demonstrate the unique capability of the algorithm of determining well distributed solutions on the global and local Pareto frontiers for global multiobjective continuous nonlinear constrained optimisation problems. The results also show this capability when the algorithm is applied to non-hierarchically decomposable systems, as typically encountered when performing MDO. Further work could extend the approach in order to handle mixed discrete/contin.

Download or read book Aircraft Conceptual Design by Collaborative Manual and Automatic Agents written by Kamran Eftekhari Shahroudi and published by . This book was released on 1997 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "In real applications, it is extremely difficult (if not impossible) to define function(s) that measure the 'true merit' of a design object. For example, even the most prominent aircraft designers would not dare to claim that a particular set of merit and constraint functions measures the 'true merit' of a class of aircraft. The traditional approach to set up a 'machine centric' optimization cannot effectively address this issue because there is no user interaction with the numerical optimization at design or run time. The semi-automatic concept, however, can help because the user is allowed to interact with the design problem and the design progress in-the-loop, such that the design criteria can be improved relatively easily at design time. This paper briefly describes the semi-automatic design optimization setup which was introduced in full detail in a previous paper by the author. A simple multidisciplinary aircraft conceptual design optimization problem is then specified based on Torenbeek (1992). Various modes of in-the-loop user control on the search progress and the search problem then illustrate the potential benefits of allowing the user to interact with a numerical agent at various levels of automation."

Download or read book Bi Level Integrated System Synthesis BLISS written by Jaroslaw Sobieszczanski-Sobieski and published by . This book was released on 1998 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Contributions to Aircraft Preliminary Design and Optimization written by Mihaela Florentina Niță and published by . This book was released on 2012 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Incorporation of Physics based Controllability Analysis in Aircraft Multi fidelity MADO Framework written by Christopher Meckstroth and published by . This book was released on 2019 with total page 170 pages. Available in PDF, EPUB and Kindle. Book excerpt: A method is presented to incorporate physics-based controllability assessment in an aircraft Multi-disciplinary Analysis and Design Optimization environment with a target fidelity representing the traditional preliminary aircraft design phase. This method was designed with specific intended application to innovative vehicle concepts such as the Efficient Supersonic Air Vehicle, a tailless fighter-type aircraft which requires the use of innovative control effectors to achieve yaw control requirements. Typically, the layout of an aircraft is determined primarily through empirical design methods with minimal physical evaluation influencing the shape. As a result, the evaluation of new technologies such as these innovative control effectors in the past has been limited to placement and testing of them within existing free real estate on an otherwise complete vehicle design. The hypothesis of this dissertation is that inclusion of such technology in earliest stages of the design process has a greater chance of leading to optimal benefit and potentially a closed design for a tailless fighter-type aircraft. However, incorporation of technology that does not have a strong statistical basis through prior work requires some form of physical analysis to be performed in the design iteration. An aerodynamic study was performed to determine the optimal combination of fidelity and computation time for analyzing these types of configurations for the controls analysis in the MADO environment, resulting in the use of a multi-fidelity approach to aerodynamic analysis. This approach in turn requires a multi-fidelity, parameterized geometric model of the aircraft with automated generation of analysis mesh. In traditional aircraft design, the disciplines involved are isolated from each other in a linear manner such that one finishes prior to another beginning. Multidisciplinary approaches attempt to merge these. However, in open literature the fidelity level of various disciplines tends to have an inverse relationship. For example, the most complicated controllers explored in MADO tend to use the lowest fidelity aerodynamics and those that use higher fidelity aerodynamics tend to incorporate only a basic controllability assessment if any at all. In fact, this is the first known aircraft MADO effort to incorporate at least preliminary design levels of fidelity into both the aerodynamics and controls disciplines simultaneously. The approach of this dissertation was to test the implications of this by executing the MADO framework with both the low-fidelity aerodynamics and the multi-fidelity aerodynamics approach that is tailored to the controllability method desired. Using only the low-fidelity aerodynamics, the MADO result led to an infeasible aircraft configuration. However, the multi-fidelity approach resulted in an aircraft configuration markedly similar to previous real-life designs and with computed controllability in both the pitch and yaw axes optimized to be slightly above input design requirements.

Download or read book Aircraft Design Integration and Optimization written by ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (France) and published by . This book was released on 1974 with total page 345 pages. Available in PDF, EPUB and Kindle. Book excerpt: The symposium emphasis and theme -- impact of the preliminary design process on the development, production, and operational cost of aircraft systems -- were woven into all sessions of the Symposium through discussions of technical approaches, methods and experiences relating to cost reductions, means of improving aircraft quality, and orderly introduction of new technology. Case histories of actual aircraft preliminary design and hardware developments were included to provide retrospective insight into the role and adequacy of the design process. Authors were requested to consider the implications of cost and the extent to which cost was used as a design parameter or as a special objective. A technical approach, with discussion of actual design experiences, analysis methods, and concepts, was emphasized in order to avoid excessive generalization in discussing cost and design process questions and to provide engineering data of value along with insight into the role and impact of the preliminary design process.