Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 19 of 19 for “"Unified formulation"”.
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Analysis of Thin-Walled Beam and Flexible Plate Structures through the Unified Formulation
L'abstract è presente nell'allegato / the abstract is in the attachment
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Towards a feedback design process using Digital Thread
… maintain engineering products, a principled and unified formulation of the data-driven design problem using Digital Thread remains absent in the literature. Prior work on Digital Thread has targeted enterprise level risk/value assessments, addressing upcoming challenges and future visions, and …
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Theoretical and Experimental Studies of Manipulation of Elastic Waves in Helix Metamaterials
… Strong vibration attenuation; Carrera Unified Formulation Abstract Elastic metamaterials exhibit mechanical properties unattainable in natural materials and demonstrate vast potential in vibration and noise reduction, acoustic functional devices, acoustic stealth, energy harvesting, and …
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Dynamics and Control of Flexible Aircraft
… dissertation integrates in a single mathematical formulation the disciplines pertinent to the flight of flexible aircraft, namely, analytical dynamics, structural dynamics, aerodynamics and controls. The unified formulation is based on fundamental principles and incorporates in a natural manner …
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A Unified Robust Minimax Framework for Regularized Learning Problems
… model. In this work, we propose a robust minimax formulation to interpret the relationship between data and regularization terms for a large class of loss functions. We show that various regularization terms are essentially corresponding to different distortions to the original data matrix. This …
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A Finite Element Framework for the Thermal Analysis of Solids and Fluids
The lack of a unified continuum-mechanics approach for predicting the thermal displacements of solids and fluids demonstrates the need for a consistent and unified formulation for the continua that include both solids and fluids. In conventional finite-element formulations, volume changes of solids …
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Structural health monitoring of polymer-matrix composites (PMCs) using embedded piezoelectric transducers: experimental and numerical approaches
… (SHM). The numerical model, using the Carrera Unified Formulation (CUF) developed at MUL2 in PoliTo, provides a robust foundation for analysis via plate and beam models of higher-order kinematics. The experimental phase was started with the self-heating tensile tests conducted on the composite …
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Strong-form governing equations and solutions for variable kinematic beam theories with practical applications
… developed within the framework of the Carrera Unified Formulation (CUF), according to which the three-dimensional displacement field can be expressed as an arbitrary expansion of the generalized displacements. The governing differential equations for static, free vibration and linearized …
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Refined and advanced shell models for the analysis of advanced structures.
… two-dimensional models, which employ Carrera’s Unified Formulation (CUF), are presented. The dissertation is organized in three main parts: - the refined and advanced shell models contained in the CUF; - the computational methods used to calculate the solution of differential equations; - the …
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Scheduling of costly measurements for state estimation using reinforcement learning
… and RL. On the measurement scheduling side, a unified formulation is presented which encompasses the wide variety of problems found in the literature as well as more complex variations. This is used with RL to handle a series of problems of increasing difficulty. Both continuous and discrete …
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A variational framework for multi-scale defect modeling in strained electronics and processing of composite materials
… based on a system of variationally consistent formulations that allow for the modeling of the material processing stage and incorporate multi-physics coupling for multi-constituent materials. A stabilized and novel discontinuity capturing formulation is developed to model multi-phase flow of …
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Modelling-based design of anisotropic piezocomposite transducers and multi-domain analysis of smart structures
… elements for structural analyses based on a Unified Formulation (UF) by Carrera are developed and coupled via the Arlequin method proposed by Ben Dhia. Solid, plate and beam finite elements for mechanical and for piezoelectric problems are presented. Via UF, higher order and piezoelectric …
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A Geometrically nonlinear curved beam theory and its finite element formulation
… remains rigid, and its finite element formulation/implementation. The theory provides a theoretical view and an exact and efficient means to handle a large range of nonlinear beam problems. A geometrically exact curved/twisted beam theory, which assumes that the beam cross-section …
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Develpoment of advanced structural multifield models for the study of smart wing
… in the first part of this work. The Carrera Unified Formulations (CUF) give the possibility to run various theories for an assigned problem (materials, geometry, lamination lay-out, boundary conditions) at the same time. Trough the use of the CUF it is possible to introduce the so-called …
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A Mathematical Discussion of Corotational Finite Element Modeling
… Corotational (EICR) Method and the more general Unified Small-Strain Corotational Formulation. The former was developed by Rankin, Brogan and Nour-Omid [106]. The latter, created by Felippa and Haugen [49], provides a theoretical frame work for the EICR and similar methods and its own enhanced …
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A unified multi-physics formulation for combustion modelling
… work is to produce an integrated mathematical formulation for the numerical modelling of material response due to detonation wave loading. In particular, we are interested to capture miscible and immiscible behaviour within condensed-phase explosives arising from the co-existence of a reactive …
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Higher-order Beam Theories for Continuum Damage Mechanics with Regularization Techniques
L'abstract è presente nell'allegato / the abstract is in the attachment
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Global/local and coupled high order FEM-Peridynamics models for fracture analysis of isotropic and composite structures
L'abstract è presente nell'allegato / the abstract is in the attachment
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Multiscale finite element models for the analysis, design and optimisation of variable stiffness composites
L'abstract è presente nell'allegato / the abstract is in the attachment