Browsing Rensselaer Libraries by Subject "Aeronautical engineering"
Now showing items 21-40 of 126
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An implicit functional theory of viscoplasticity
(Rensselaer Polytechnic Institute, Troy, NY, 1976-09)A constitutive theory suitable for the description of metallic material behavior has been developed within the framework of a thermodynamical continuum theory. The theoretical development is firmly rooted in the concepts ... -
An investigation of the approximate optimal projection reduced-order models for elliptic partial differential equations
(Rensselaer Polytechnic Institute, Troy, NY, 2016-05)Reduced-order modeling is often utilized in obtaining an approximate solution to a complex high-fidelity system. An essential step in constructing a reduced-order system is to project the original high-fidelity system onto ... -
Angles only initial orbit determination and navigation for space debris capture applications
(Rensselaer Polytechnic Institute, Troy, NY, 2022-12)A major, long-term problem facing space exploration and utilization today is the increase in space debris. As has been highlighted increasingly in both peer-reviewed literature and national media, space debris poses an ... -
Attitude determination from triaxial ellipsoid of unknown orientation
(Rensselaer Polytechnic Institute, Troy, NY, 2020-12)Presented is the derivation for the rotation matrix describing the principal axis of a celestial body of unknown attitude relative to a spacecraft of known attitude. Through the use of the lit limb of an ellipsoidal body ... -
Autoignition studies of diesel alternative biofuels
(Rensselaer Polytechnic Institute, Troy, NY, 2013-05)The autoignition of biofuel compounds that offer potential as diesel fuel alternatives was studied under high-pressure engine-like conditions using the shock tube technique. Ignition delay times were determined in reflected ... -
Autonomous controls for active space debris removal
(Rensselaer Polytechnic Institute, Troy, NY, 2023-05)Space debris poses a major threat to the long-term endeavors of humanity. A build-up and consequential cascade of debris collisions may very well render space travel nearly to completely impossible. The economic, scientific, ... -
Autonomous navigation in deep space using optical measurements of unresolved planets and stars
(Rensselaer Polytechnic Institute, Troy, NY, 2022-12)One of the essential challenges in spaceflight is spacecraft navigation. This is the estimation of the state – position, velocity, and attitude – of a spacecraft given available measurements. The development of sensors and ... -
Busemann-sears-haack hybrid geometries applied toward supersonic commercial vehicles for improved wave drag performance
(Rensselaer Polytechnic Institute, Troy, NY, 2019-05)In this thesis, I have presented a new configuration for supersonic aircraft fuselages. I first demonstrated that the commercial Fluent code provides mesh converged, valid results for supersonic flows around various ... -
Characterization of high speed synthetic jet actuators
(Rensselaer Polytechnic Institute, Troy, NY, 2015-12)Altering the clamping conditions, at which the disks are clamped, showed that increasing the number of clamping points where the disks are clamped, improved the performance of the jet. Coupling this with a flexible clamping ... -
Closing the loop with blur
(Rensselaer Polytechnic Institute, Troy, NY, 2015-08)A great variety of systems use image sensors to provide measurements for closed loop operation. A drawback of using image sensors in real-time feedback is that they provide measurements at slower sampling rates as compared ... -
Coaxial rotor hover power reduction using dissimilarity between upper and lower rotor design
(Rensselaer Polytechnic Institute, Troy, NY, 2015-08)The present work investigates the power reductions that can be achieved through the use of dissimilar rotors in a coaxial rotor system. The aerodynamic interactions of the coaxial system are modeled using an adapted Blade ... -
Combined experimental and numerical investigations into laser propulsion engineering physics
(Rensselaer Polytechnic Institute, Troy, NY, 2010-08) -
Comet dynamics and implications for orbiting spacecraft
(Rensselaer Polytechnic Institute, Troy, NY, 2015-05)In this thesis, a comet model is presented and used to analyze an orbiting spacecraft in the presence of outgassing. Simulations are conducted in an attempt to classify the environment around a comet during different orbital ... -
Comprehensive structural dynamic and aeroelastic analysis of smart-beam energy harvesters
(Rensselaer Polytechnic Institute, Troy, NY, 2017-05)This thesis presents research on the topic of fluid-structure interactions of smart beam energy harvesters for use in aerospace applications. A detailed overview of energy harvesting and how it is defined for this specific ... -
Computational analysis of swirling flows in a pipe
(Rensselaer Polytechnic Institute, Troy, NY, 2015-12)The vortex breakdown of a swirling jet flow entering a finite-length pipe is studied in this thesis. The theories of Rusak and co-authors which provide fundamental tools to predict the first occurrence of breakdown and simulate ... -
Computational methods for the dynamic compaction of porous solids
(Rensselaer Polytechnic Institute, Troy, NY, 2016-12)A 78% dense porous aluminum material was chosen and run through a variety of simulations to predict its compaction under dynamic loadings. The results of these computations were compared to experimental data collected by ... -
Control of laminar boundary layers using electro active polymers
(Rensselaer Polytechnic Institute, Troy, NY, 2010-08) -
Control of tollmien-schlichting waves on a natural laminar airfoil via dynamic surface modulation
(Rensselaer Polytechnic Institute, Troy, NY, 2023-05)The study presented here demonstrates experimental mitigation of Tollmien-Schlichting (TS)waves on Natural Laminar Flow (NLF) wind tunnel models. Experiments were first conducted on an unswept NLF airfoil at a chord-based ... -
Coping with shock : numerical procedure for the detection and sorting of shocks in fluid flows
(Rensselaer Polytechnic Institute, Troy, NY, 2021-05)Within computational fluid dynamics (CFD) simulations, many complex flow phenomena can emerge. Accurately modeling these phenomena is often a primary motivating factor behind these simulations, and shocks are some of the ... -
Demonstration of a mid-infrared carbon monoxide sensor
(Rensselaer Polytechnic Institute, Troy, NY, 2008-12)Initial stages in the development of a carbon monoxide diagnostic are completed. This diagnostic is unique in that it utilizes mid-infrared radiation generated by a quantum cascade laser to perform absorption spectroscopy. ...