A5039896168- Structural Analysis and Optimization
- Structural Health Monitoring Techniques
- Aerospace Engineering and Energy Systems
- Planetary Science and Exploration
- Meteorological Phenomena and Simulations
- Optical measurement and interference techniques
- Dynamics and Control of Mechanical Systems
- Software Engineering Research
- Structural Engineering and Vibration Analysis
- Probabilistic and Robust Engineering Design
- Software Engineering Techniques and Practices
- Spacecraft Design and Technology
- Infrastructure Maintenance and Monitoring
- Vibration and Dynamic Analysis
- Spacecraft Dynamics and Control
- Wind and Air Flow Studies
- Biomimetic flight and propulsion mechanisms
- Advanced Aircraft Design and Technologies
- Software Reliability and Analysis Research
- Advanced Materials and Mechanics
- Atmospheric aerosols and clouds
- Modular Robots and Swarm Intelligence
- Scientific Computing and Data Management
- Aerospace and Aviation Technology
- Teaching and Learning Programming
University of Kentucky
2015-2024
National PKU Alliance
2022
University of Iowa
2020
Rockwell Automation (United States)
2020
Oak Ridge National Laboratory
2020
Defense Systems (United States)
2020
University of California, Berkeley
2020
East Tennessee State University
1988-2014
Lycoming College
2011
Office of Scientific and Technical Information
2003
Small unmanned aircraft systems (sUAS) are rapidly transforming atmospheric research. With the advancement of development and application these systems, improving knowledge best practices for accurate measurement is critical achieving scientific goals. We present results from an intercomparison data Lower Atmospheric Process Studies at Elevation-a Remotely piloted Aircraft Team Experiment (LAPSE-RATE) field campaign. evaluate a total 38 individual sUAS with 23 unique sensor platform...
This paper discusses results of the CLOUD-MAP (Collaboration Leading Operational UAS Development for Meteorology and Atmospheric Physics) project dedicated to developing, fielding, evaluating integrated small unmanned aircraft systems (sUAS) enhanced atmospheric physics measurements. The team includes scientists, meteorologists, engineers, computer geographers, chemists necessary evaluate needs develop advanced sensing imaging, robust autonomous navigation, data communication, management...
ABSTRACT Because unmanned aircraft systems (UAS) offer new perspectives on the atmosphere, their use in atmospheric science is expanding rapidly. In support of this growth, International Society for Atmospheric Research Using Remotely-Piloted Aircraft (ISARRA) has been developed and convened annual meetings “flight weeks.” The 2018 flight week, dubbed Lower Profiling Studies at Elevation–A Team Experiment (LAPSE-RATE), involved a 1-week deployment to Colorado’s San Luis Valley. Between 14 20...
On-orbit testing will be required for final tuning and validation of any mathematical model large space structures. Identification methods using limited response data to produce optimally adjusted property matrices seem ideal this purpose, but difficulties exist in the application previously published truss This article presents new stiffness matrix adjustment that generalize optimal-update secant found quasi-Newton approaches nonlinear optimization. Many aspects may better understood within...
Abstract Uncrewed aircraft system (UAS) observations collected during the 2018 Lower Atmospheric Process Studies at Elevation—a Remotely Piloted Aircraft Team Experiment (LAPSE-RATE) field campaign were assimilated into a high-resolution configuration of Weather Research and Forecasting Model using an ensemble Kalman filter. The benefit UAS was assessed for terrain-driven (drainage upvalley) flow event that occurred within Colorado’s San Luis Valley (SLV) independent observations. analysis...
Abstract. Unmanned aircraft systems (UASs) offer innovative capabilities for providing new perspectives on the atmosphere, and therefore atmospheric scientists are rapidly expanding their use, particularly studying planetary boundary layer. In support of this expansion, from 14 to 20 July 2018 International Society Atmospheric Research using Remotely piloted Aircraft (ISARRA) hosted a community flight week, dubbed Lower Profiling Studies at Elevation – Remotely-piloted Team Experiment...
The paper presents work on testing of inflatable wings for unmanned aerial vehicles (UAVs). Inflatable wing his tory and recent research is discussed. Design con struction then covered, along with ground flight testing. Discussions include predictions correlations the forces required to warp (twist) a particular shape aerodynamic generated by that change. focus charac terizing deformation development model accurately predict deformation. Relations be tween stiffness internal pressure impact...
Inflatable wings are examined for use in high altitude long endurance (HALE) aircraft. Due to the unique requirements HALE flight such as aspect ratio and unconventional airfoil profiles due low density aerodynamic efficiency, this places significant constraints on inflatable wing designs vehicles. Since achieve their structural stiffness from inflation pressure, bending loads experienced at root of must be supported by either extremely pressures, mechanical means, or some combination...
The 0-1 test for chaos is a recently developed time series characterization algorithm that can determine whether system chaotic or nonchaotic. While the was designed deterministic series, in real-world measurement situations, noise levels may not be known and have difficulty distinguishing between randomness. In this paper, we couple with determinism apply these tests to noisy symbolic generated from various model systems. We find pairing of improves ability correctly distinguish randomness...
Abstract. In July 2018, unmanned aerial systems (UASs) were deployed to measure the properties of lower atmosphere within San Luis Valley, an elevated valley in Colorado, USA, as part Lower Atmospheric Profiling Studies at Elevation – a Remotely-piloted Aircraft Team Experiment (LAPSE-RATE). Measurement objectives included detailing boundary layer transition, canyon cold-air drainage and convection initiation valley. Details contribution LAPSE-RATE made by University Kentucky are provided...
Independent of the modal identification techniques employed for damage detection, use measured data limits expectations location. These limitations are examined using distribution strain energy and sensitivity frequency mode shapes to structural stiffness changes. For given information specific accuracy, this examination reveals following: (1) detection is feasible members that contribute significantly modes, (2) modes which most effective in detecting certain critical can be identified, (3)...
We use unmanned aerial vehicles to interrogate the surface layer processes during a solar eclipse and gain comprehensive look at changes made atmospheric as result of rapid change insolation. Measurements structure by systems are connected measurements provide holistic view impact on near-surface behaviour, large-scale turbulent structures small-scale dynamics. Different regimes behaviour were identified, with most significant including formation stable just after totality evidence...
The paper presents work on testing of inflatable wings for unmanned aerial vehicles (UAVs). Design and construction is discussed, along with bench, tunnel flight testing. focus characterizing the deformation development a system to deform in flight. A lifting line code was used predict potential benefits wing twisting roll control vehicle. Predictions correlations forces required warp particular shape were conducted laboratory. These deformations characterized through use photogrammetry....
Deployable wing technology can offer many benefits to specific UAV missions, most importantly low-volume storage of the wings when vehicle is not in-flight. designs enable aircraft be more effective by providing larger numbers in volume restricted applications, such as air, submarine, or hand launches. As platforms become smaller, new avenues for deployable arise. This paper discusses issues related small UAVs and some limitations certain designs. In particular, differences between rigid...
Recently, various system identification approaches have been developed and applied for the detection of damage in flexible structures. In this paper, modal characteristics extracted from vibration tests are used with an original finite element model approach to combine advantages two classes techniques: eigensensitivity multiple-constraint matrix adjustment. Here, physical property parameters adjusted, as techniques, but employed, adjustment methods. The performance hybrid technique is shown...
In this paper, algorithmic approaches to enhance damage detection capability when faced with incomplete measurements are addressed. The measurement problem arises in part because of the mismatch number degrees freedom included structural math model versus instrumented during testing. Studies comparing reduction, eigenvector expansion, and a hybrid reduction/eigenvector expansion performed using experimental data. These evaluated within frameworks optimal matrix update theory (both sparsity...
Tests of large structures on-orbit will be performed with measurements at a relatively few structure points. Values for the unmeasured degrees freedom (dofs) can estimated based on measured dofs and analytical model dynamic information. These 'expanded' mode shapes are useful optimal-update identification damage location as well test/analysis correlation. A new method expansion test shape vectors is developed from orthogonal Procrustes problem computational linear algebra. subspace defined...
BIG BLUE (baseline inflatable-wing glider, balloon-launched unmanned experiment) is a flight experiment envisioned, designed, built, and flown primarily by undergraduate students in the College of Engineering at University Kentucky. was conceived as demonstration unique inflatable wing technologies with potential for application Mars airplanes. On May 3, 2003, achieved first-ever deployment curing UV hardening wings reached an altitude 27.1km (89,000ft). II launched successfully on 1, 2004...
The present paper provides a snapshot of current work on developing and flying UAVs with inflatable-rigidizable wings. BIG BLUE (Baseline Inflatable Glider BalloonLaunched Unmanned Experiment) project at the University Kentucky funded under NASA Workforce Development Grant has primary objective promoting aerospace careers to undergraduate students. goal is flight-test high-altitude aircraft wings determine concept feasibility for Mars explorer mission. are stowed in fuselage, inflate during...