Relevant bibliographies by topics / Structural and parametric space

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Structural and parametric space'

Author: Grafiati
Published: 4 June 2025
Last updated: 6 July 2025

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Journal articles on the topic "Structural and parametric space"

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Amores, Alvaro Martin-Delgado, Eva M. Andrés-Lopez, and Alfredo Sanz-Lobera. "Parametric Design of a Structural Plate for a Microsatellite." Key Engineering Materials 961 (October 11, 2023): 161–68. http://dx.doi.org/10.4028/p-kc5rix.

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In this century, the development of space technologies has substantially increased. As space launchers improve their performance, space agencies have adopted the use of smaller satellites. Modern space platforms have structural requirements that entail the use of an optimized methodology for automating the creation of satellite designs. Parametrization can play a crucial role in this task. The aim of this paper is to parametrize a structural plate used in a microsatellite preliminary structure and analyze its mechanical behavior under the application of static forces. For such parameterization, a step-by-step procedure was developed using CATIA V5 and a Visual Basic Application was created to assist designers in managing the procedure. Once the preliminary designs were obtained, a parameter structural impact comparison was conducted using ANSYS. Finally, four preliminary designs which met the ASAP 5 launcher requirements were selected, and their structural behaviors were compared.
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Scarpa, F. "Parametric Sensitivity Analysis of Coupled Acoustic-Structural Systems." Journal of Vibration and Acoustics 122, no. 2 (1999): 109–15. http://dx.doi.org/10.1115/1.568447.

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In this paper a method for the parametric sensitivity of acoustic-structural coupled systems is presented. The symmetrical Eulerian formulation is applied in order to calculate the coupled frequencies and modes. From a state space formulation of the problem a sensitivity algorithm is developed to obtain the derivatives of the coupled frequencies and modes of the system versus a design parameter vector. The algorithm is based on the properties of the complex conjugate eigenvalues obtained from the solution of the state space equation. Numerical examples from an acoustic rectangular cavity backed by a simply supported plate are presented. The comparison reveals a good agreement between numerical and analytical results. [S0739-3717(00)00802-3]
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Filina, Elena K., Evgenii S. Golubev, Konstantin V. Mikhailovskiy, and Mikhail Yu Arkhipov. "Design of the structural arrangement for a space reflector via parametric and topology optimization." RUDN Journal of Engineering Researches 20, no. 4 (2019): 276–84. http://dx.doi.org/10.22363/2312-8143-2019-20-4-276-284.

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Development of the optimal structural arrangement for a reflector with the aim to improve its mass and design is of importance due to the necessity to increase areal density and decrease rigidity of the modern space antennas vehicles. Currently, CAE-systems allow to design reflectors using both traditional methods, for example, parametric optimization, and methods which are innovative in this field, such as topology optimization. The paper compares two methods of the structural arrangement design for a thin dimensionally stable reflector operating as part of a geostationary spacecraft: parametric and topology optimization. The algorithms of the structural arrangement development which include the statement of the optimization problem, geometry design and a number of check analyses are presented. A number of structural of a space reflector design under the action of loads at the stage of launch, temperature gradients at the exploitation conditions and modal analysis is performed. The designed reflectors are compared. The studies performed allowed us to develop the optimal structural arrangement for a space reflector using the parametric and topology optimization. The optimal structural arrangement for a space reflector using the optimization could be produced surface figure error (estimated in RMS) with respect to the theoretical paraboloid.
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Hanaor, Ariel, and An-Fu Ong. "On Structural Redundancy in Space Trusses." International Journal of Space Structures 3, no. 4 (1988): 237–41. http://dx.doi.org/10.1177/026635118800300405.

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Static redundancy does not ensure structural redundancy in cases where the collapse mechanism involves instability. Structural redundancy is defined here as the ability of the structure to sustain its design load with the loss of one or more critical elements. The parametric investigations on a square on square double-layer grid presented here, suggests that the loss of one critical member from this type of structure typically entails a loss of 20% to 30% of load carrying capacity. To allow for structural redundancy, as well as for loss of carrying capacity due to the effect of imperfections, it is recommended to reduce compression members' buckling (or allowable) stress by a corresponding value or, alternatively, to perform a suitable analysis.
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Pushkar, Svetlana. "Relationship between Project Space Types, Optimize Energy Performance Credit, and Project Size in LEED-NC Version 4 (v4) Projects: A Case Study." Buildings 12, no. 6 (2022): 862. http://dx.doi.org/10.3390/buildings12060862.

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A previous study (Pushkar 2021) showed a significant non-parametric correlation between the Optimize Energy Performance credit from the energy and atmosphere category (EAc7) and project size in Leadership in Energy and Environmental Design for New Construction and Major Renovations version 4 (LEED-NC v4) office space projects. However, in such an empirical analysis, there are at least two problems: the choice between parametric and non-parametric statistics, and the choice between the Wilcoxon–Mann–Whitney (WMW) and analysis of covariance (ANCOVA) non-parametric tests. This study aims to evaluate EAc7 credit achievement for different types of spaces in LEED-NC v4 projects. We show that, in order to evaluate the differences between two LEED data groups, (1) a non-parametric procedure is preferable to a parametric one, and (2) if there is Spearman’s correlation between EAc7 credit achievement and project size for the same LEED-NC v4 project, then Quade’s ANCOVA is preferable to WMW. The results of these tests show that, in two out of three cases, office space projects had better EAc7 credit achievement than higher-education spaces at the gold certification level and public assembly spaces at the silver certification level.
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Tsimura, Yu, A. Kostromytskyi, O. Suhanov, and S. Dumych. "METHOD OF ENCODING VIDEO DATA IN SPECTRAL-PARAMETRIC SPACE." Information and communication technologies, electronic engineering 4, no. 1 (2024): 61–69. http://dx.doi.org/10.23939/ictee2024.01.061.

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It is shown that the development of modern infocommunication systems is followed by the trend of widespread use of wireless technologies. The level of intellectualization of the protocols of their functioning is increasing. Accordingly, the characteristics of wireless infocommunication technologies for data transmission are increasing. This contributes to their use for data transmission from remote robotic platforms in the process of information support for the functioning of critical infrastructure. It is substantiated that the transmission of video data with the required level of bit intensity on the basis of existing on-board telecommunication technologies is organized under conditions of significant time delays. Consequently, the level of efficiency of information delivery is lost. On the other hand, there are losses in the reliability of video information. It is argued that the option for solving the problem lies in the further development of technologies for encoding video information streams. The most common platform is the JPEG format. However, the city has disadvantages. They refer to the loss of compression levels in the event of a reduction in the potential for detecting psychovisual addictions. The article substantiates an approach for improvement, which consists in the use of an adapted coding technology in the spectral-parametric space. This approach consists in detecting subbands in spectral arrays and their subsequent parameterization with the formation of structural components at a significant level and length. Further processing is proposed to be carried out taking into account the informativeness of segments and reducing the amount of structural redundancy. An approach for constructing a technology for compression of spectral arrays with the detection of spectral sub-bands is substantiated. A model has been created to find the amount of information for transformed segments in the spectral-parametric space. This takes into account the available amount of redundancy, which is established by determining the constraints on the values of structural components. A method for encoding segments in spectral-parametric description has been developed. The main basic components of the method relate to the processing of sets of two-component structural-parametric components, taking into account the peculiarities of their content depending on the presence of quantization processes.
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Dipaola, Vincenzo, and Giuseppe Prete. "“Premit” System for Space Reticulated Structures." International Journal of Space Structures 18, no. 1 (2003): 61–72. http://dx.doi.org/10.1260/026635103769016636.

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This is the third of three papers where we present the application potential of an original structural process for steel space grids, named PREMIT System. Here we explain the geometrical and structural characteristics of the welded version of the proposed System. Moreover we carry out the static analysis of structural components and we present a parametric modelling. Finally a codification and an inventory of technical solutions, useful to satisfy the design requirements of a wide applicative case study, are proposed. In the Appendix we present two System's variants, valid for both the bolted and the welded versions, with the aim to achieve appreciable economies in terms of materials and manufacturing.
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Gaha, Inès Sahtout. "Parametric Architectural Design for a New City Identity: Materials, Environments and New Applications." Journal of Contemporary Urban Affairs 7, no. 1 (2023): 122–38. http://dx.doi.org/10.25034/ijcua.2023.v7n1-9.

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In contemporary architectural Design, we speak of a parametric structural design. A design that integrates new functionalities crossed with the spatial geometry of objects. It has been considered structured because it optimizes combinations that integrate a minimum of materials and data to respond to functions, uses, and needs more adapted to a society in perpetual evolution. Parametric modelling allows the usability of new materials and the integration of new structures in a variety of design environments. This transdisciplinary research explores aspects of parametric modelling, a design method that creates digital models using algorithms and parameters. By focusing on the material and immaterial plurality of the designed space, this method enables the generation of complex and innovative forms that would be difficult to realize with traditional methods. Then, from a position that redefines the city as both a "medium" city and an "object" city, we explore the fields of application and novelties that are investing in the fields of architectural construction. We examine how parametric modelling can be used to create more sustainable and environmentally efficient buildings, using parametric processes, and optimizing the use of space. In this sense, our research will lead us to identify two aspects of parametric modelling: the conceptual parametric design aspect and the constructive parametric design aspect. Finally, the results of our research enable us to identify a design process that demonstrates the feasibility of using parametric modelling to generate viable, sustainable, and versatile spaces.
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Goldbach, A., and K. U. Bletzinger. "CAD-integrated Parametric Design Cycle for Structural Membranes." Journal of the International Association for Shell and Spatial Structures 60, no. 4 (2019): 266–72. http://dx.doi.org/10.20898/j.iass.2019.202.024.

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The design cycle of membrane structures consists of three interactive and highly non-linear disciplines. Formfinding is performed in order to find a geometry that allows the prestressed structure to carry loads through tension only. Once a formfound geometry is set, structural analysis needs to assess the structure's safety and usability. The most challenging step is the cutting pattern generation, which aims at finding the planar pieces which can be elevated to build spatial membrane structures with a minimum deviation from the desired shape and prestress state.<br/> Isogeometric B-Rep Analysis (IBRA) allows the designer to perform analyses on the original CAD model without leaving the CAD environment. High quality is ensured for the geometry and the mechanical approximation by using Non-Uniform Rational B-Splines (NURBS). Additionally, the topology information of multipatches can be transferred to the analysis in order to enrich the design space. Trimmed and coupled surfaces can thus be included in the analysis. Parametric models allow the designer to examine a large variety of geometrical and mechanical entities with one model.<br/> The advantages of the CAD-integration with IBRA for the highly interactive design of structural membranes are shown in this contribution.
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Su, Chao Hao, and Ke Xiang. "Structural Morphology Design of Muping Sports Center Based on Bionics and Digital Technology." Applied Mechanics and Materials 71-78 (July 2011): 4048–51. http://dx.doi.org/10.4028/www.scientific.net/amm.71-78.4048.

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Based on bionics and digital technology, the efficient methods to create and control architectural bionic forms through parametric technology are discussed. The harmonic integration of morphological bionics with mechanical logics in the digital space, is considered as the key point in structural morphological design with the structural mechanics theory.
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Dissertations / Theses on the topic "Structural and parametric space"

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BARROSO, VITOR BARATA RIBEIRO BLANCO. "EFFICIENT FLUID SIMULATION IN THE PARAMETRIC SPACE OF THREE-DIMENSIONAL STRUCTURED GRIDS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2014. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=28689@1.

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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO<br>CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO<br>FUNDAÇÃO DE APOIO À PESQUISA DO ESTADO DO RIO DE JANEIRO<br>BOLSA NOTA 10<br>Fluidos são extremamente comuns em nosso mundo e têm papel central em muitos fenômenos naturais. A compreensão de seu comportamento tem importância fundamental em uma vasta gama de aplicações e diversas áreas de pesquisa, da análise de fluxo sanguíneo até o transporte de petróleo, da exploração do fluxo de um rio até a previsão de maremotos, tempestades e furacões. Na simulação de fluidos, a abordagem conhecida como Euleriana é capaz de gerar resultados bastante corretos e precisos, mas as computações envolvidas podem se tornar excessivamente custosas quando há a necessidade de tratar fronteiras curvas e obstáculos com formas complexas. Este trabalho aborda esse problema e apresenta uma técnica Euleriana rápida e direta para simular o escoamento de fluidos em grades estruturadas parametrizadas tridimensionais. O principal objetivo do método é tratar de forma correta e eficiente as interações de fluidos com fronteiras curvas, incluindo paredes externas e obstáculos internos. Para isso, são utilizadas matrizes Jacobianas por célula para relacionar as derivadas de campos escalares e vetoriais nos espaços do mundo e paramétrico, o que permite a resolução das equações de Navier-Stokes diretamente no segundo, onde a discretização do domínio torna-se simplesmente uma grade uniforme. O trabalho parte de um simulador baseado em grades regulares e descreve como adaptá-lo com a aplicação das matrizes Jacobianas em cada passo, incluindo a resolução de equações de Poisson e dos sistemas lineares esparsos associados, utilizando tanto iterações de Jacobi quanto o método do Gradiente Biconjugado Estabilizado. A técnica é implementada na linguagem de programação CUDA e procura explorar ao máximo a arquitetura massivamente paralela das placas gráficas atuais.<br>Fluids are extremely common in our world and play a central role in many natural phenomena. Understanding their behavior is of great importance to a broad range of applications and several areas of research, from blood flow analysis to oil transportation, from the exploitation of river flows to the prediction of tidal waves, storms and hurricanes. When simulating fluids, the so-called Eulerian approach can generate quite correct and precise results, but the computations involved can become excessively expensive when curved boundaries and obstacles with complex shapes need to be taken into account. This work addresses this problem and presents a fast and straightforward Eulerian technique to simulate fluid flows in three-dimensional parameterized structured grids. The method s primary design goal is the correct and efficient handling of fluid interactions with curved boundary walls and internal obstacles. This is accomplished by the use of per-cell Jacobian matrices to relate field derivatives in the world and parameter spaces, which allows the Navier-Stokes equations to be solved directly in the latter, where the domain discretization becomes a simple uniform grid. The work builds on a regular-grid-based simulator and describes how to apply Jacobian matrices to each step, including the solution of Poisson equations and the related sparse linear systems using both Jacobi iterations and a Biconjugate Gradient Stabilized solver. The technique is implemented efficiently in the CUDA programming language and strives to take full advantage of the massively parallel architecture of today s graphics cards.
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Gao, Haotian. "POD-Galerkin based ROM for fluid flow with moving boundaries and the model adaptation in parametric space." Diss., Kansas State University, 2018. http://hdl.handle.net/2097/38776.

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Doctor of Philosophy<br>Department of Mechanical and Nuclear Engineering<br>Mingjun Wei<br>In this study, a global Proper Orthogonal Decomposition (POD)-Galerkin based Reduced Order model (ROM) is proposed. It is extended from usual fixed-domain problems to more general fluid-solid systems with moving boundaries/interfaces. The idea of the extension is similar to the immersed boundary method in numerical simulations which uses embedded forcing terms to represent boundary motions and domain changes. This immersed boundary method allows a globally defined fixed domain including both fluid and solid, where POD-Galerkin projection can be directly applied. However, such a modified approach cannot get away with the unsteadiness of boundary terms which appear as time-dependent coefficients in the new Galerkin model. These coefficients need to be pre-computed for prescribed periodic motion, or worse, to be computed at each time step for non-prescribed (e.g. with fluid-structure interaction) or non-periodic situations. Though computational time for each unsteady coefficient is smaller than the coefficients in a typical Galerkin model, because the associated integration is only in the close neighborhood of moving boundaries. The time cost is still much higher than a typical Galerkin model with constant coefficients. This extra expense for moving-boundary treatment eventually undermines the value of using ROMs. An aggressive approach is to decompose the moving boundary/domain to orthogonal modes and derive another low-order model with fixed coefficients for boundary motion. With this domain decomposition, an approach including two coupled low-order models both with fixed coefficients is proposed. Therefore, the new global ROM with decomposed approach is more efficient. Though the model with the domain decomposition is less accurate at the boundary, it is a fair trade-off for the benefit on saving computational cost. The study further shows, however, that the most time-consuming integration in both approaches, which come from the unsteady motion, has almost negligible impact on the overall dynamics. Dropping these time-consuming terms reduces the computation cost by at least one order while having no obvious effect on model accuracy. Based on this global POD-Galerkin based ROM with forcing term, an improved ROM which can handle the parametric variation of body motions in a certain range is also presented. This study shows that these forcing terms not only represent the moving of the boundary, but also decouple the moving parameters from the computation of model coefficients. The decoupling of control parameters provides the convenience to adapt the model for the prediction on states under variation of control parameters. An improved ROM including a shit mode seems promising in model adaptation for typical problems in a fixed domain. However, the benefit from adding a shit mode to model diminishes when the method is applied to moving-boundary problems. Instead, a combined model, which integrates data from a different set of parameters to generate the POD modes, provides a stable and accurate ROM in a certain range of parametric space for moving-boundary problems. By introducing more data from a different set of parameters, the error of the new model can be further reduced. This shows that the combined model can be trained by introducing more and more information. With the idea of the combined model, the improved global ROM with forcing terms shows impressive capability to predict problems with different unknown moving parameters, and can be used in future parametric control and optimization problems.
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Dubanchet, Vincent. "Modélisation et contrôle d’un robot spatial flexible pour la capture d’un débris en rotation." Thesis, Toulouse, ISAE, 2016. http://www.theses.fr/2016ESAE0022/document.

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Les débris en orbite sont actuellement une source de préoccupation majeure pour les acteurs du spatial et pour le reste de la population, comme en témoignent les articles de presse et les œuvres cinématographiques sur le sujet. En effet, la présence de ces objets menace directement les astronautes en mission et les satellites en opération. Parmi les nombreuses options déjà envisagées pour les traiter, cette thèse se concentre sur l’approche robotique, en proposant des outils et des méthodes de modélisation et de contrôle pour un satellite chasseur équipé d’un bras manipulateur. Des modèles dynamiques et des schémas de simulation optimisés sont ainsi développés pour tout système multi-corps constitué d’une base mobile supportant un nombre quelconque d’appendices rigides ou flexibles. Par la suite, les trajectoires de capture sont générées en conservant la continuité en accélération avec le mouvement naturel du point cible, dans le but de saisir aussi délicatement que possible le débris en rotation. Le suivi de cette trajectoire par l’effecteur du robot chasseur est alors assuré par une loi de contrôle à deux niveaux, dont le réglage repose sur la synthèse H1 structurée. Une étude de robustesse est également mise en place pour assurer la stabilité et les performances du système en boucle fermée, malgré les changements de configuration du bras. Enfin, la validation des travaux de thèse est réalisée par voie numérique avec un simulateur haute-fidélité, et par voie pratique avec un banc d’essais robotique incluant des composants physiques en temps réel<br>On-orbit debris are currently causing deep concern for space agencies, related companies, and also among the population. ¿is is evidenced by the numerous scientific articles and recent movies on the matter. Indeed, these objects pose a serious threat for the astronauts on mission and for operational satellites. Among the various technical concepts already designed to address these threats, this thesis focuses on space robotics. Tools and methods are thus introduced for the modeling and control of a chaser satellite equipped with a manipulator. Dynamic models and optimized simulation schemes are developed to handle any multi-body system made up of amoving base embedding various appendages, either rigid or flexible. ¿en, a trajectory planner is designed to ensure acceleration continuity with the natural motion of the debris in order to perform a soft capture. ¿is reference trajectory is tracked by the end-effector of the chaser using a two-level control law, which is tuned by the structured H1 synthesis. A robustness analysis is also presented to assess the stability and the performances of the closed-loop system with respect to the motion of the robotic arm. Finally, the outcome of the thesis is validated by a twofold approach: by numerical means with a highfidelity simulator, and by practical ones with a robotic test bench including physical components in real time
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Normann, James Brian. "Parametric identification of nonlinear structural dynamic systems." Thesis, Virginia Tech, 1989. http://hdl.handle.net/10919/43294.

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The identification of linear structural dynamic systems has been dealt with extensively in past studies. Identification methods for nonlinear structures have also been introduced in previous articles, including procedures based on the method of multiple scales, iterative and noniterative direct methods, and state space mappings. Here, a procedure is introduced for the identification of nonlinear structural dynamic systems which is readily applicable to simple as well as more complex multiple degree of freedom systems. The procedure is based on multiple step integration methods for the solution of differential equations. The multiple step integration procedure and the iterative direct method are applied to a number of nonlinear single degree of freedom examples, and are applied to a simple two degrees of freedom example as well. RMS based noise is added to a simulated measured response in order to monitor the effects of measurement errors on the procedures. The input data is filtered before final processing in the identification algorithms. The multistep algorithm is compared to the iterative direct method on the basis of criteria such as accuracy, ease of use, and numerical efficiency.<br>Master of Science
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Danhaive, Renaud Aleis Pierre Emile. "Integrating interactive evolutionary exploration and parametric structural design." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/99595.

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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Civil and Environmental Engineering, 2015.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 47-48).<br>Current modeling and analysis tools are extremely powerful and allow one to generate and analyze virtually any structural shape. However, most of them do not allow designers to integrate structural performance as an objective during conceptual design. As structural performance is highly linked to architectural geometry, there is a need for computational strategies allowing for performance-oriented structural design in architecture. In order to address these issues, this research combines interactive evolutionary optimization and parametric modeling to develop a new computational strategy for creative and high-performance conceptual structural design. Parametric modeling allows for quick exploration of complex geometries and can be combined with analysis and optimization algorithms for performance-driven design. However, this methodology often questions the designer's authorship as it is based on the use of black-box optimizers. On the other hand, interactive evolutionary optimization empowers the user by acknowledging his or her input as fundamental and includes it in the evolutionary optimization process. This approach aims at improving the structural performance of a concept without limiting the creative freedom of designers. Taking advantage of the two frameworks, this research implements an interactive evolutionary structural optimization framework in the widely used parametric modeling environment constituted by Rhinoceros and Grasshopper. Previous work has illustrated the benefits of combining parametric modeling and genetic algorithms for design space exploration. Comparatively, the implemented design tool capitalizes on Grasshopper's versatility for geometry generation but supplements the visual programming interface with a flexible portal increasing the designer's creative freedom through enhanced interactivity. The tool can accommodate a wide range of structural typologies and geometrical forms in an integrated environment. This research offers a versatile, performance- and user-oriented environment for creative and efficient conceptual structural design.<br>by Renaud Aleis Pierre Emile Danhaive.<br>M. Eng.
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Jones, Garrett P. (Garrett Pierce). "Interoperable software for parametric structural analysis and optimization." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82713.

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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2013.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Cataloged from student-submitted PDF version of thesis. "June 2013."<br>Includes bibliographical references (p. 62-64).<br>The advent of building information modeling in the structural engineering profession has brought forth new challenges to the traditional methods of design and analysis. The need for faster, more robust analyses to mitigate expenses and increase structural insight is a demand that stems from the implementation of BIM modeling. Current software interoperability now allows engineers limited opportunity to engage directly and immediately with the design process. The development of tools which can bring together the architectural and structural engineering professions are of paramount importance in the next phase of professional design. In response to this professional demand, a software framework for Rhino3D modeling software was created which explores the various methods of searching a design space and finding solutions. Both parametric design generation and genetic optimizations were employed, allowing architects and engineers to explore the design space of a structure using metrics important to each field. A case study is performed using the developed software framework to quantify results and validate the effectiveness of such a new design tool in the current engineering profession. The outcome is an improved design experience that is feasible in time and scope, allowing architects and engineers an opportunity to truly explore the design space. Keywords: Parametric modeling and analysis, Genetic optimization, Building information modeling<br>by Garrett P. Jones.<br>M.Eng.
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Stefan, Diana. "Structural and parametric identification of bacterial regulatory networks." Thesis, Grenoble, 2014. http://www.theses.fr/2014GRENM019/document.

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Les technologies expérimentales à haut débit produisent de grandes quantités de données sur les niveaux d'expression des gènes dans les bactéries à l'état d'équilibre ou lors des transitions de croissance.Un défi important dans l'interprétation biologique de ces données consiste à en déduire la topologie du réseau de régulation ainsi que les fonctions de régulation quantitatives des gènes.Un grand nombre de méthodes d'inférence a été proposé dans la littérature. Ces méthodes ont été utilisées avec succès dans une variété d'applications, bien que plusieurs problèmes persistent.Nous nous intéressons ici à l'amélioration de deux aspects des méthodes d'inférence.Premièrement, les données transcriptomiques reflètent l'abondance de l'ARNm, tandis que, le plus souvent, les composants régulateurs sont les protéines codées par les ARNm.Bien que les concentrations de l'ARNm et de protéines soient raisonnablement corrélées à l'état stationnaire, cette corrélation devient beaucoup moins évidente dans les données temporelles acquises lors des transitions de croissance à cause des demi-vies très différentes des protéines et des ARNm.Deuxièmement, la dynamique de l'expression génique n'est pas uniquement contrôlée par des facteurs de transcription et d'autres régulateurs spécifiques, mais aussi par des effets physiologiques globaux qui modifient l'activité de tous les gènes. Par exemple, les concentrations de l'ARN polymérase (libre) et les concentrations des ribosomes (libres) varient fortement avec le taux de croissance. Nous devons donc tenir compte de ces effets lors de la reconstruction d'un réseau de régulation à partir de données d'expression génique.Nous proposons ici une approche expérimentale et computationnelle combinée pour répondre à ces deux problèmes fondamentaux dans l'inférence de modèles quantitatifs de promoteurs bactériens à partir des données temporelles d'expression génique.Nous nous intéressons au cas où la dynamique de l'expression génique est mesurée in vivo et en temps réel par l'intermédiaire de gènes rapporteurs fluorescents. Notre approche d'inférence de réseaux de régulation tient compte des différences de demi-vie entre l'ARNm et les protéines et prend en compte les effets physiologiques globaux.Lorsque les demi-vies des protéines sont connues, les modèles expérimentaux utilisés pour dériver les activités des gènes à partir de données de fluorescence sont intégrés pour estimer les concentrations des protéines.L'état physiologique global de la cellule est estimé à partir de l'activité d'un promoteur de phage, dont l'expression n'est contrôlée par aucun des facteurs de transcription et ne dépend que de l'activité de la machinerie d'expression génique.Nous appliquons l'approche à un module central dans le réseau de régulation contrôlant la motilité et le système de chimiotactisme chez Escherichia coli.Ce module est composé des gènes FliA, FlgM et tar.FliA est un facteur sigma qui dirige l'ARN polymérase vers les opérons codant pour des composants de l'assemblage des flagelles.Le troisième composant du réseau, tar, code pour la protéine récepteur chimiotactique de l'aspartate, Tar, et est directement transcrit par FliA associé à l' holoenzyme ARN polymérase. Le module FliA-FlgM est particulièrement bien adapté pour l'étude des problèmes d'inférence considérés ici, puisque le réseau a été bien étudié et les démivies des protéines jouent un rôle important dans son fonctionnement.Nos résultats montrent que, pour la reconstruction fiable de réseaux de régulation transcriptionelle chez les bactéries, il est nécessaire d'inclure les effets globaux dans le modèle de réseau et d'en déduire de manière explicite les concentrations des protéines à partir des profils d'expression observés, car la demi-vie de l'ARNm et des protéines sont très différentes. Notre approche reste généralement applicable à une grande variété de problèmes d'inférence de réseaux et nous discutons les limites et les extensions possibles de la méthode<br>High-throughput technologies yield large amounts of data about the steady-state levels and the dynamical changes of gene expression in bacteria. An important challenge for the biological interpretation of these data consists in deducing the topology of the underlying regulatory network as well as quantitative gene regulation functions from such data. A large number of inference methods have been proposed in the literature and have been successful in a variety of applications, although several problems remain. We focus here on improving two aspects of the inference methods. First, transcriptome data reflect the abundance of mRNA, whereas the components that regulate are most often the proteins coded by the mRNAs. Although the concentrations of mRNA and protein correlate reasonably during steady-state growth, this correlation becomes much more tenuous in time-series data acquired during growth transitions in bacteria because of the very different half-lives of proteins and mRNA. Second, the dynamics of gene expression is not only controlled by transcription factors and other specific regulators, but also by global physiological effects that modify the activity of all genes. For example, the concentrations of (free) RNA polymerase and the concentration of ribosomes vary strongly with growth rate. We therefore have to take into account such effects when trying to reconstruct a regulatory network from gene expression data. We propose here a combined experimental and computational approach to address these two fundamental problems in the inference of quantitative models of the activity of bacterial promoters from time-series gene expression data. We focus on the case where the dynamics of gene expression is measured in vivo and in real time by means of fluorescent reporter genes. Our network reconstruction approach accounts for the differences between mRNA and protein half-lives and takes into account global physiological effects. When the half-lives of the proteins are available, the measurement models used for deriving the activities of genes from fluorescence data are integrated to yield estimates of protein concentrations. The global physiological state of the cell is estimated from the activity of a phage promoter, whose expression is not controlled by any transcription factor and depends only on the activity of the transcriptional and translational machinery. We apply the approach to a central module in the regulatory network controlling motility and the chemotaxis system in Escherichia coli. This module comprises the FliA, FlgM and tar genes. FliA is a sigma factor that directs RNA polymerase to operons coding for components of the flagellar assembly. The effect of FliA is counteracted by the antisigma factor FlgM, itself transcribed by FliA. The third component of the network, tar, codes for the aspartate chemoreceptor protein Tar and is directly transcribed by the FliA-containing RNA polymerase holoenzyme. The FliA-FlgM module is particularly well-suited for studying the inference problems considered here, since the network has been well-studied and protein half-lives play an important role in its functioning. We stimulated the FliA-FlgM module in a variety of wild-type and mutant strains and different growth media. The measured transcriptional response of the genes was used to systematically test the information required for the reliable inference of the regulatory interactions and quantitative predictive models of gene regulation. Our results show that for the reliable reconstruction of transcriptional regulatory networks in bacteria it is necessary to include global effects into the network model and explicitly deduce protein concentrations from the observed expression profiles. Our approach should be generally applicable to a large variety of network inference problems and we discuss limitations and possible extensions of the method
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Malladi, Sailaja. "Parametric modeling and analysis of structural bonded joints." Morgantown, W. Va. : [West Virginia University Libraries], 2004. https://etd.wvu.edu/etd/controller.jsp?moduleName=documentdata&jsp%5FetdId=80.

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Thesis (M.S.)--West Virginia University, 2004.<br>Title from document title page. Document formatted into pages; contains x, 56 p. : ill. (some col.). Includes abstract. Includes bibliographical references (p. 52-53).
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Masendeke, Rugare B. "Parametric study of stiffened steel containment shell structures." Master's thesis, University of Cape Town, 2008. http://hdl.handle.net/11427/19019.

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Includes bibliographical references. .<br>A FEM-based parametric study is undertaken to investigate the buckling behavior of meridionally and circumferentially stiffened steel cylindrical and conical shell frustum subjected to different load cases. This situation arises in different steel shell applications such as storage vessels (liquid, solid and gas) and in certain configurations of industrial process facilities. The stiffeners are flat strips of rectangular section welded on to the outer surface of the shell, either over the whole length of the shell meridian or around the circumference of the shell. It is required to establish how the elastic buckling load and mode shapes vary with respect to certain key parameters of the problem. The parameters of interest in the study include the number of stiffeners around the shell circumference and along the meridian, the stiffener-depth to shell-thickness ratio, and the stiffener depth-to-width ratio. This thesis reports the findings of the parametric study and also presents some results of experimental tests on laboratory small-scale models of stiffened cylindrical and conical frusta.
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Sareen, Samita. "Estimation and testing of structural parametric sealed-bid auctions." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0026/NQ49879.pdf.

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Books on the topic "Structural and parametric space"

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Morgantini, Marcello. Structural damage assessment through parametric and nonparametric models. [publisher not identified], 2020.

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Jurkowski, Jacek. High-speed generation of certain parametric space-curves. Institute of Computer Science, Polish Academy of Sciences, 1988.

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R, Parke G. A., and Howard C. M. Mr, eds. Space structures 4. Thomas Telford, 1993.

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American Institute of Aeronautics and Astronautics., ed. Standard space systems: Structures, structural components, and structural assemblies. American Institute of Aeronautics and Astronautics, 2005.

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United States. National Aeronautics and Space Administration., ed. Numerical model of solar dynamic radiator for parametric analysis. National Aeronautics and Space Administration, 1989.

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United States. National Aeronautics and Space Administration., ed. Numerical model of solar dynamic radiator for parametric analysis. National Aeronautics and Space Administration, 1989.

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Tom, Vines, and Wright Richard, eds. Confined space and structural rope rescue. Mosby, 1998.

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Ryan, Robert S. Structural margins assessment approach. National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1988.

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Ryan, Robert S. Structural margins assessment approach. National Aeronautics and Space Administration, George C. Marshall Space Flight Center, 1988.

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Britvec, S. J. Stability and optimization of flexible space structures. Kirkhäuser Verlag, 1995.

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Book chapters on the topic "Structural and parametric space"

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Pereverdieva, Ksenia, Michael Emmerich, André Deutz, Tessa Ezendam, Thomas Bäck, and Hèrm Hofmeyer. "The Prism-Net Search Space Representation for Multi-objective Building Spatial Design." In Lecture Notes in Computer Science. Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-27250-9_34.

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AbstractA building spatial design (BSD) determines external and internal walls and ceilings of a building. The design space has a hierarchical structure, in which decisions on the existence or non-existence of spatial components determine the existence of variables related to these spaces, such as sizing and angles. In the optimization of BSDs it is envisioned to optimize various performance indicators from multiple disciplines in concert, such as structural, functional, thermal, and daylight performance. Existing representations of design spaces suffer from severe limitations, such as only representing orthogonal designs or representing the structures in parametric superstructure, allowing only for limited design variations. This paper proposes prism nets - a new way of representing the search space of BSDs based on triangulations defining space filling collections of triangular prisms that can be combined via coloring parameters to spaces. Prism nets can accommodate for non-orthogonal designs and are flexible in terms of topological variations. We follow the guidelines for representation and operator design proposed in the framework of metric-based evolutionary algorithms. The main contribution of the paper is a detailed discussion of the search space representation and corresponding mutation operators. Moreover, a proof of concept example demonstrates the integration into multi-objective evolutionary algorithms and provides first results on a simple, but reproducible, benchmark problem.
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Hu, Yi, Yong Zhao, Zhouhui Tuo, and Jie Wang. "Parametric Modeling and Optimal Design of Space Tubular Extendable Booms via a One-Dimensional Unified Formulation." In Advances in Structural and Multidisciplinary Optimization. Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-67988-4_46.

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Pillonetto, Gianluigi, Tianshi Chen, Alessandro Chiuso, Giuseppe De Nicolao, and Lennart Ljung. "Regularization in Reproducing Kernel Hilbert Spaces." In Regularized System Identification. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95860-2_6.

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AbstractMethods for obtaining a function g in a relationship $$y=g(x)$$ y = g ( x ) from observed samples of y and x are the building blocks for black-box estimation. The classical parametric approach discussed in the previous chapters uses a function model that depends on a finite-dimensional vector, like, e.g., a polynomial model. We have seen that an important issue is the model order choice. This chapter describes some regularization approaches which permit to reconcile flexibility of the model class with well-posedness of the solution exploiting an alternative paradigm to traditional parametric estimation. Instead of constraining the unknown function to a specific parametric structure, the function will be searched over a possibly infinite-dimensional functional space. Overfitting and ill-posedness are circumvented by using reproducing kernel Hilbert spaces as hypothesis spaces and related norms as regularizers. Such kernel-based approaches thus permit to cast all the regularized estimators based on quadratic penalties encountered in the previous chapters as special cases of a more general theory.
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Liu, Fuyuan, Min Chen, Lizhe Wang, Xiang Wang, and Cheng-Hung Lo. "Custom-Fit and Lightweight Optimization Design of Exoskeletons Using Parametric Conformal Lattice." In Proceedings of the 2021 DigitalFUTURES. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5983-6_12.

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AbstractThis paper presents an integrated design method for the customization and lightweight design of free-shaped wearable devices, illustrated by a lower limb exoskeleton. The customized design space is derived from the 3D scanning models. Based on the finite element analysis, the structural framework is determined through topology optimization with allowable strength. By means of generative design, the lattice library is constructed to fill the frames under different conformal algorithms. Finally, the proposed method is illustrated by the exoskeleton design case.
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Vlasov, A. N., D. B. Volkov-Bogorodsky, and V. L. Savatorova. "Using Asymptotic Homogenization in Parametric Space to Determine Effective Thermo-Viscoelastic Properties of Fibrous Composites." In Advanced Structured Materials. Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-22401-0_10.

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Arora, Hemant, Vrushang Patel, B. S. Munjal, and Sudipto Mukherjee. "Parametric Optimization of Joints and Links of Space Deployable Antenna Truss Structure." In Lecture Notes in Mechanical Engineering. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-1769-0_33.

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Yan, Mengling, Xiang Yu, Suyang Shen, and Tiantian Zhang. "Parametric-Generative Design Research Based on the Perception Rule of “View Changes with Step Movements” in Master-of-Nets Garden in Suzhou, China." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2025. https://doi.org/10.1007/978-981-96-4749-1_2.

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Abstract Suzhou classical gardens represent the essence of Chinese classical gardens, characterized by complex spatial structures and rich garden elements. Visitors usually experience diverse spatial perceptions in Suzhou gardens, including the commonly mentioned experience of “view changes with step movements (VCWSM)”. Through the perception survey in the Master-of-Nets Garden, which is one of the most noted classical gardens in China, this study extracted the key factors that affect the generation of “view changes with step movements”, that is, the distance between the viewpoint and the main scene, and their position relationship. Based on it, this research developed a graphic scripting structure of the parametric system authored in Grasshopper. Finally, a pocket park was selected as the design site. Its path network with viewpoints was generated by Grasshopper, and trees were set between each viewpoint and the main scene to create different views, generating the perception of VCWSM. This process demonstrates the application of classical garden spatial structure to modern landscape design through a parametric approach, a methodology that can be adapted for the modern re-interpretation of other classical garden space designs.
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Ningsih, Tria Amalia, Abraham Chintianto, Cahyo Pratomo, Muhammad Haikal Milleza, Muhammad Arif Rahman, and Intan Chairunnisa. "Hexagonal Responsive Facade Prototype in Responding Sunlight." In Computational Design and Robotic Fabrication. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-8637-6_36.

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AbstractThis paper discusses an architectural responsive façade system using hexagonal parametric forms and kinetic mechanism which responds sunlight. Its purposes are to buffer excessive sun exposure that goes through interior space and maximize the covering area with an incremental rotational joint system. The study aims to explore responsive façade system as second skin for architectural building, focusing on design, mechanism, and fabrication processes. The prototype consists of three parts: the hexagonal modules where the membranes and its frames are compacted; a series of levers to synchronize the movement of opening the membranes from each module; and a structural framework to hold each module as united kinetic façade system. As a preliminary prototype, the system can potentially be applied to several types of existing buildings and easily installed in various sizes and configuration. This kinetic mechanism can decrease sun radiation up to 50% than unprotected window façade.
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Wang, Sicong, Haizhen Sun, and Lining Sun. "Mechanical Property Analysis of a Deployable Tape-Spring Boom Using for Aerospace Structures." In Lecture Notes in Civil Engineering. Springer Nature Singapore, 2024. http://dx.doi.org/10.1007/978-981-97-4355-1_28.

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AbstractDeployable coilable tape-spring booms have many advantages especially for use in space, such as light-weight, high folded-ratio and small storage volume. The boom’s folding and deploying process is accompanied with the large-scaled deformation of thin-walled materials, which may damage the boom on stress concentration points. For the sake of avoiding failures during coiling and deployment process, this paper aimed at acquiring the critical points on a boom which were vulnerable to be destroyed. Since the interactions of the boom’s infinitesimals were complicated, a numerical model was considered to be introduced. Meanwhile, the mechanical properties of the boom’s deployed state were also analyzed for a better design, and both the deploying and deployed behaviors were further analyzed through parametric study. The research of this paper will give more guidance on the design of tape-spring booms and the selection of the key parameters.
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Junges, Sebastian, and Matthijs T. J. Spaan. "Abstraction-Refinement for Hierarchical Probabilistic Models." In Computer Aided Verification. Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-13185-1_6.

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AbstractMarkov decision processes are a ubiquitous formalism for modelling systems with non-deterministic and probabilistic behavior. Verification of these models is subject to the famous state space explosion problem. We alleviate this problem by exploiting a hierarchical structure with repetitive parts. This structure not only occurs naturally in robotics, but also in probabilistic programs describing, e.g., network protocols. Such programs often repeatedly call a subroutine with similar behavior. In this paper, we focus on a local case, in which the subroutines have a limited effect on the overall system state. The key ideas to accelerate analysis of such programs are (1) to treat the behavior of the subroutine as uncertain and only remove this uncertainty by a detailed analysis if needed, and (2) to abstract similar subroutines into a parametric template, and then analyse this template. These two ideas are embedded into an abstraction-refinement loop that analyses hierarchical MDPs. A prototypical implementation shows the efficacy of the approach.
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Conference papers on the topic "Structural and parametric space"

1

Lim, Joon. "Cheeseman Award Paper: Consideration Of Structural Constraints In Passive Rotor Blade Design For Improved Performance." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10109.

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This design study applied parameterization to rotor blade for improved performance. In the design, parametric equations were used to represent blade planform changes over the existing rotor blade model. Design variables included blade twist, sweep, dihedral, and the radial control point. Updates to the blade structural properties with changes in the design variables allowed accurate evaluation of performance objectives and realistic structural constraints - blade stability, steady moments (flap bending, chord bending, and torsion), and the high g maneuver pitch link loads. Performance improvement was demonstrated with multiple parametric designs. Using a parametric design with the advanced airfoils, the predicted power reduction was 1.0% in hover, 10.0% at μ=0.30, and 17.0% at μ=0.40 relative to the baseline UH-60A rotor, but these were obtained with a 35% increase in the steady chord bending moment at μ=0.30 and a 20% increase in the half peak-to-peak pitch link load during the UH-60A UTTAS maneuver. Low vibration was maintained for this design. More rigorous design efforts, such as chord tapering and/or structural redesign of the blade cross section, would enlarge the feasible design space and likely provide significant performance improvement.
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Biron, Guillaume, Maxime Lapalme, and Marc Ouellet. "Surrogate Modeling Method Applied to a Typical Multivariable Structural Stress Evaluation Problem." In Vertical Flight Society 71st Annual Forum & Technology Display. The Vertical Flight Society, 2015. http://dx.doi.org/10.4050/f-0071-2015-10267.

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In this paper, an application of surrogate modeling for the analysis of structural problems is presented. The case study of this paper, a tension joint, is analyzed using a parametric non-linear Finite Element (FE) model in order to gather data for the generation of the surrogate model. The data points are defined using a design of experiments based on Optimal Latin Hypercube Sampling and the surrogate model is generated using a kriging function. The resulting surrogate model is validated using FE results from a second design of experiments and by comparison with an analytical approach. The comparison between the kriging method and the analytical approach shows respectively an average error of 1.2% and 7.6% over the entire design space. The maximum error is respectively of 4.0% and 20.1%. This approach shows great promise for structural analysis as it can greatly reduce computational cost for the analysis of recurring problems. It is also easy to implement and can be used for complex structural problems.
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Gallaher, Andrew. "Method for Estimating Inertial Properties of Rotorcraft in Conceptual Design." In Vertical Flight Society 73rd Annual Forum & Technology Display. The Vertical Flight Society, 2017. http://dx.doi.org/10.4050/f-0073-2017-12022.

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The conceptual design of aircraft is a continuously evolving and expanding discipline where the primary task is to perform a trade-space analysis to meet a set of operational and performance requirements. One of the major aspects of conceptual design is mass properties analysis, which involves analyzing the mass distribution of an aircraft layout. The results of this analysis can be used in other aspects of the design process: handling qualities analysis, packaging layout, control surface sizing, and inertial loading for structural design. Traditionally, and when not performed using parametric databases, mass properties is a time consuming process. The analysis requires an initial layout of both the aircraft outer mold-line (OML) shaping and internal component placement. At which point, handbook methods or Computer Aided Design (CAD) software are leveraged to analyze the distribution of mass in the aircraft layout. Presented herein is a method for automating the mass properties analysis of a conceptual aircraft design by leveraging light-weight scriptable CAD software capability, outputs from aircraft conceptual performance and sizing software, methods for geometrically representing rotor systems, and parametric scaling rules for internal component placement. This method quickly and accurately returns inertial estimates for a variety of rotorcraft configurations allowing for trade-space exploration.
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Kopp, A., N. Garbers, R. Jarlas, and H. Rabia. "Parametric Structural Analysis for the SpaceLiner." In 18th AIAA/3AF International Space Planes and Hypersonic Systems and Technologies Conference. American Institute of Aeronautics and Astronautics, 2012. http://dx.doi.org/10.2514/6.2012-5944.

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Wang, Lyang Suan, Payam Haghighi, Satchit Ramnath, Kurtis Horner, Duane Detwiler, and Jami J. Shah. "Automating Parametric Redesign of Structural Thin-Walled Frames." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97087.

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Abstract Thin walled frames are prevalent in automotive body structures as they provide lower vehicle weight to meet strength and stiffness requirements for different type of loading cases. Reducing body weight improves fuel efficiency. The inner and outer styling surfaces drive the shape of the design space which constrains structural configurations and size of parts. Although automotive structural engineers have been using thin walled frames for years, they are keen on getting improvements through topology optimization. This paper focuses on development of a set of methods that automate the process of creating hollow cross-sections for body components inside the design space. Lofting these cross-sections along the load path of each component results in a surface model which can be used in FEA for verification and later in designing joints between different components. The starting point of this methodology is the curve skeleton, which is a 1D representation of the load paths within the design space. By analyzing the load paths, planes normal to the curve can be created to cut the design space to obtain the 2D wireframe of the boundaries. Predefined parameterized cross-sections created based on experiential knowledge that are stored in our cross-section tutor, can then be mapped to reside inside the design space boundaries at these different cutting locations. Several test cases are presented to discuss the capabilities and limitations of the tool. Future work on expanding the software to include more functions is also presented.
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Ravichandran, Krupakaran, Nafiseh Masoudi, Georges M. Fadel, and Margaret M. Wiecek. "Parametric Optimization for Structural Design Problems." In ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-97860.

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Abstract Parametric Optimization is used to solve problems that have certain design variables as implicit functions of some independent input parameters. The optimal solutions and optimal objective function values are provided as functions of the input parameters for the entire parameter space of interest. Since exact solutions are available merely for parametric optimization problems that are linear or convex-quadratic, general non-convex non-linear problems require approximations. In the present work, we apply three parametric optimization algorithms to solve a case study of a benchmark structural design problem. The algorithms first approximate the nonlinear constraint(s) and then solve the optimization problem. The accuracy of their results and their computational performance are then compared to identify a suitable algorithm for structural design applications. Using the identified method, sizing optimization of a truss structure for varying load conditions such as a varying load direction is considered and solved as a parametric optimization problem to evaluate the performance of the identified algorithm. The results are also compared with non-parametric optimization to assess the accuracy of the solution and computational performance of the two methods.
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Diez, M., A. Serani, F. Stern, and R. Pellegrini. "Design-Space Dimensionality Reduction in Structural Optimization via Parametric Model Embedding." In 10th Conference on Computational Methods in Marine Engineering. CIMNE, 2023. http://dx.doi.org/10.23967/marine.2023.054.

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Daye, Jacob G., Andrew J. Lee, Cody Griffee, and Niccoli Scalice. "Optimal Cable-Stayed Configurations for Pretensioned Space Structures." In ASME 2024 Aerospace Structures, Structural Dynamics, and Materials Conference. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/ssdm2024-121579.

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Abstract To improve the deployed stiffness and mass efficiency of pre-tensioned spacecraft structures, the efficacy of cable-stayed configurations is analyzed in this paper. The reference structure is a deployable array wing that supports a series of RF panels for space-based antenna applications, and it is designed to be z-folded under stowage. Due to the significant mass of the panels and the large span of the array wing, the entire structure is susceptible to low frequency excitation. Lightweight pretensioned cables that elastically support and stiffen the array along its span are found to drastically raise its fundamental frequency and critical buckling load. An analytical model that is validated by finite element simulations is used to predict the vibration and buckling modes of the constituent structures for both the reference and cable-stayed architectures. A parametric analysis then optimizes the cross-section of the load-bearing members, cable attachment points, and the number of cables to maximize the fundamental frequency for the structural systems. These optimal cable-stayed forms are compared against the reference design, and their effectiveness is demonstrated with a 157% and 255% increase in fundamental frequency for one and two cables, respectively.
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Sanmugadas, Varakini, and Rakesh K. Kapania. "Truss Topology Optimization With Semidefinite Programming and Parametric Model Order Reduction." In ASME 2023 Aerospace Structures, Structural Dynamics, and Materials Conference. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/ssdm2023-108410.

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Abstract The feasibility of a hybrid PMOR-SDP approach, that combines semidefinite programming (SDP) and parametric model order reduction (PMOR) was investigated. When an optimization problem comprises of a linear objective and linear matrix inequality constraints, SDP provides an efficient algorithm for arriving at a globally optimum design. This is achieved by solving a linear systems of equations that simultaneously satisfies the optimality conditions of the primal and dual problems. Weight minimization of a structure subjected to frequency or buckling constraints is amenable to this approach. It is postulated that with the right choice of basis and sufficient reduction in the size of the system matrices defining the problem, the convergence of the SDP problem can be accelerated. To test this idea, the weight minimization of a 200-bar truss, subjected to a frequency constraint, was studied here owing the relative simplicity of the problem. The MOSEK solver was used to solve the linear SDP problem. It was found that the Krylov space containing the second moment provided the best basis set. However, the expected reduction in optimization time was not achieved as this approach did not preserve the sparse nature of the stiffness and mass matrices. Future work will study structure-preserving model order reduction to address this issue.
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Januszkiewicz, K., and J. Gołębiewski. "Parametric Green Footbridges in Urban Space. a new Approach to Design Environment-friendly Structures." In IABSE Symposium, Wroclaw 2020: Synergy of Culture and Civil Engineering – History and Challenges. International Association for Bridge and Structural Engineering (IABSE), 2020. http://dx.doi.org/10.2749/wroclaw.2020.0372.

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&lt;p&gt;In the 21st century, digital design tools, which are interfaced with the CNC technology, have opened the new opportunities that not only are shaping structural objects, but also interfering with the urban tissue. The first part of the paper defines the main features of the “green” approach to the built environment. Selected examples illustrate diverse approaches to designing footbridges, and what combines them is the use of digital tools, especially the topological and analytical ones, in shaping and constructing parametric forms. The second part presents how structural engineers and architects can develop a new framework for the urban design by correlating digital morphogenesis and ecology. This integrated “morpho-ecological” approach has resulted in a new kind of eco-friendly bridges, based on the modulation of micro-environmental conditions within an emergent macro-environmental system. The conducted research has presented alternative ideas of efficiency and sustainability.&lt;/p&gt;
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Reports on the topic "Structural and parametric space"

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KOCH, MARK W., SEAN A. MCKENNA, and ROGER L. BILISOLY. Syndrome Surveillance Using Parametric Space-Time Clustering. Office of Scientific and Technical Information (OSTI), 2002. http://dx.doi.org/10.2172/805872.

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Setayesh, A. A Parametric Study of the Release of CO2 in Space. Defense Technical Information Center, 1991. http://dx.doi.org/10.21236/ada236271.

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Lyubenova, Velislav, Maya Ignatova, and Georgi Kostov. Interactive Teaching System for Structural and Parametric Identification of Bioprocess Models. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, 2018. http://dx.doi.org/10.7546/crabs.2018.06.13.

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Bubacz, Jacob A., Hana T. Chmielewski, Alexander E. Pape, et al. Phase Space Dissimilarity Measures for Structural Health Monitoring. Office of Scientific and Technical Information (OSTI), 2011. http://dx.doi.org/10.2172/1029952.

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Allen, J., and J. Lauffer. Integrated structural control design of large space structures. Office of Scientific and Technical Information (OSTI), 1995. http://dx.doi.org/10.2172/10115453.

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Nesheim, Lars. Heterogeneous Euler Equations: A Semi-parametric Structural Approach - conference presentation at the national bureau of economic research. The IFS, 2011. http://dx.doi.org/10.1920/ps.ifs.2024.0920.

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Hausmann, Ricardo, and Bailey Klinger. Structural Transformation in Ecuador. Inter-American Development Bank, 2010. http://dx.doi.org/10.18235/0008400.

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This paper applies new techniques and metrics to analyze Ecuador's past record of and future opportunities for structural transformation. Ecuador's export dynamics and the emergence of new export activities have been the historical drivers of the country's growth, but recently Ecuador's export basket has undergone little structural transformation. The same broad sectors continue to dominate, and the overall sophistication of the export basket has actually declined in recent years. In order to consider why movement to new, more sophisticated export activities has lagged in Ecuador, we examine export connectedness and find that the country is concentrated in a peripheral part of the product space. We quantitatively scan Ecuador's efficient frontier and identify new, high-potential export activities that are nearby in the product space. This sector evaluation provides valuable information for the government to prioritize dialogue and interventions, but it is not meant to be a conclusive identification of "winners". Rather, we provide policy guidelines to facilitate the emergence of these and other new export activities, dealing with the sector-specificity of much of what the government must provide to the private sector to succeed while at the same time avoiding the well-known perils of traditional industrial policies.
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Bouzekova-Penkova, Anna, and Peter Tzvetkov. Investigation of Outer Space Influence on Structural Properties of Strengthened 7075 Aluminum Alloy. Experiments Onboard the International Space Station (ISS). "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, 2019. http://dx.doi.org/10.7546/crabs.2019.07.12.

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Bandyopadhyay, P. R. A Low-Dimensional Structural Model of a Turbulent Boundary Layer Separating Intermittently in Space. Defense Technical Information Center, 1994. http://dx.doi.org/10.21236/ada637043.

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Bouzekova-Penkova, Anns, Silvia Simeonova, Rositza Dimitrova, and Rayna Dimitrova. Structural Properties of Aluminium Alloy Enhanced by Nanodiamond and Tungsten Exposed in the Outer Space. "Prof. Marin Drinov" Publishing House of Bulgarian Academy of Sciences, 2020. http://dx.doi.org/10.7546/crabs.2020.09.11.

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