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 20 of 27 for “"Aerospace vehicles"”.
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Modeling the Dynamics of Flexible Aerospace Vehicles Using the Theory of Functional Connections
<p>Modeling and control of flexible vehicles is a topic of high interest in the aerospace field and a key challenge lies in finding accurate mathematical representations of the flexible dynamics of continuous elastic structures that allow simple integration into estimation and control algorithms. …
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Nonlinear control of underactuated mechanical systems with application to robotics and aerospace vehicles
… due to their broad applications in Robotics, Aerospace Vehicles, and Marine Vehicles. The examples of underactuated systems include flexible-link robots, nobile robots, walking robots, robots on mobile platforms, cars, locomotive systems, snake-type and swimming robots, acrobatic robots, …
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Distributed optical fibre smart sensors for acoustic sensing in the structural health monitoring of robust aerospace vehicles
… the Structural Health Monitoring (SHM) of robust aerospace vehicles has been demonstrated. Current distributed optical fibre sensors are multiplexed along a single fibre. Inherent problems exist with a multiplexed architecture. Two significant issues are; the possibility of fibre breakage, and the …
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Nonlinear finite element analysis of a laminated composite plate with nonuniform transient thermal loading
… improve efficiency and increase performance of aerospace vehicles. But because of the complex construction of laminated plates they are very difficult to analyze. Conventional thin plate theories prove to be inadequate in predicting laminated composite plate behavior. Therefore, a finite element …
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Declarative and Procedural Current Job Knowledge as Predictors of Performance in Emerging Military Jobs
… and three jobs required to operate Uninhabited Aerospace Vehicles. Job analysts (n = 35) provided job similarity ratings by comparing three emerging jobs with the current job sample. Military participants (n = 26) performed as Vehicle Operators, Payload Operators, and Mission Commanders in a …
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Hypersonic test facilities: requirements analysis and preliminary design
… about, in recent years, a renewed interest in aerospace vehicles operating in the hypersonic regime. With this interest has come a need to not only reestablish the hypersonic test capability that was available in the 1960s but to enhance this capability to meet the demanding needs of today's …
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Durability testing of an aircraft structural health monitoring system
… continuously monitoring structures for damage. Aerospace structures have one of the highest payoffs for SHM systems because damage can lead to catastrophic and expensive failures. Prior work in SHM has focused on damage detection methods and sensor optimization, however, the topics of …
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Indirect Model Reference Adaptive Control with Online Parameter Estimation
… estimation process is particularly important for aerospace vehicles that have considerable uncertainty in the model parameters, as might be the case with unmanned aerial vehicles (UAVs). This thesis investigates the use of an Indirect Model Reference Adaptive Controller (MRAC) to provide online, …
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Liquid sloshing in containers with flexibility
… storage and marine transport of liquid cargo, aerospace vehicles and earthquake-safe structures. Contributions to the state of knowledge in predicting and controlling sloshing are the main objectives of the proposed research. To this end, a numerical model has been developed to enable reliable …
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Structural analysis and optimization with a locally-Cartesian Hybrid Shell Model
… model well suited for conceptual design of aerospace vehicles. Although significantly simpler and more economical than full 3D elasticity models, it can still capture full 3D geometries, large deformations, and anisotropic materials. HSM is formulated from the full 3D equilibrium and …
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Model-based monitoring and diagnosis of systems with software-extended behavior
… However, in most complex systems today, such as aerospace vehicles, automobiles and medical devices, hardware is augmented with software functions that influence the system's behavior. As these sophisticated systems are required to perform increasingly ambitious tasks. there is a growing need to …
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Improving the Performance of Re-entry Vehicle in Hypersonic Flow by Morphing Nose cone by Bio-Mimicking Honey Bee Abdomen
Aerospace vehicles that incorporate both aeronautics and astronautics functions are fully reusable, serving as a crucial asset for nations vying for dominance in air and space control. Nevertheless, the existing nose cone of the aerospace vehicle fails to adapt effectively to variations in the …
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Machine Learning Approaches to Data-Driven Transition Modeling
… form a critical element of the CFD process for aerospace vehicles across multiple flow regimes. This dissertation explores machine learning approaches to develop transition models using data from computations based on linear stability theory. Such data provide strong correlation with the …
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The utilization and loss of available energy in aerospace systems
… volume-based energy availability methodology for aerospace vehicles are developed; applications are made to jet-propelled and rocket-propelled vehicles as well as to stand-alone engine systems. Energy availability utilization characteristics of a modeled turbojet engine are studied across a wide …
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Model predictive control for terminal area energy management and approach and landing for a reusable launch vehicle
… industry plans to develop new reusable launch vehicles. The new vehicles will need advanced, new guidance and control systems. Since 1996 Draper Laboratory has been developing the next generation guidance and control for reusable launch vehicles in which guidance and control is integrated into …
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Unsteady aerodynamics for aeroelastic applications using the impulse response method
… issue in the design of aircraft and other aerospace vehicles, particularly those with highly flexible components. A reliable but efficient analysis tool is required to aid decision-making in the preliminary design phase. This thesis focuses on the unsteady aerodynamics component of the …
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Implementation of Constrained Control Allocation Techniques Using an Aerodynamic Model of an F-15 Aircraft
Control Allocation as it pertains to aerospace vehicles, describes the way in which control surfaces on the outside of an aircraft are deflected when the pilot moves the control stick inside the cockpit. Previously, control allocation was performed by a series of cables and push rods, which …
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High-Temperature Performance of Carbon Fiber Reinforced Cyanate Ester Composites Filled with Nano-Ceramics
… materials play a vital role in the entire aerospace industry. These materials are used in aerospace vehicles, rocket nozzles, and ship hulls to protect their internal structure from hot combustion gases and as heat shielding for planetary entry also. Different loading levels (5wt%, 7.5wt% …
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Calibrating Expert Assessments of Advanced Aerospace Technology Adoption Impact
… parameter uncertainty for proposed new aerospace vehicles. From previous work, it has been shown that experts in the field of aerospace systems design and development can provide valuable input into the sizing and conceptual design of future space launch vehicles employing advanced …
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Operation Characteristics of a Plasma Torch for Supersonic Combustion Applications with Simulated Cracked JP-7 Feedstock
… fuel, which is of interest for today's aerospace vehicles. The cracked JP-7 surrogate consists of a 15/25/60 mixture of methane/ethane/ethylene. The research results include torch operational characteristics such as downstream plume temperatures and emission spectroscopy within the …
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