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Technical Paper

A Simulation Environment for Evaluating Image Processing Techniques for UAV Applications

2009-11-10
2009-01-3221
In order to perform the investigation, a simulation environment was implemented for vision-based control of a UAV. The environment included a Simulink model of a generic UAV, including the flight dynamics, flight controller, and sensors. ...The objective of this research was to investigate the feasibility of using visual sensor technology to estimate the UAV's pitch, roll, and groundspeed for future use in advanced flight controls. In order to perform the investigation, a simulation environment was implemented for vision-based control of a UAV.
Technical Paper

Balloon Launched UAV with Nested Wing for Near Space Applications

2007-09-17
2007-01-3910
The team of Gevers Aircraft, Technology Management Group, and Purdue University have designed an innovative balloon launched UAV for these near space applications. A UAV (Payload Return Vehicle) with a nested morphing wing was designed in order to meet the challenges of high altitude flight, and long range and endurance without the need for descent rate control with rockets or a feathering mode. ...There has always been, from the very first UAV, a need for providing cost-effective methods of deploying unmanned aircraft systems at high altitudes. ...Missions for UAVs at high altitudes are used to conduct atmospheric research, perform global mapping missions, collect remote sensing data, and establish long range communications networks.
Technical Paper

UAV Icing: Icing Cases for Validation of Path Planning Method

2023-06-15
2023-01-1379
As part of the complete solution to deal with atmospheric in-flight icing on unmanned aerial vehicles (UAV), a path planner is a valuable tool for finding an optimal path for accomplishing UAV missions. ...Together with an electro-thermal ice protection system (IPS), the path planner can optimize energy consumption by comparing energy consumed flying through the cloud or around it, as the UAV can now more safely pass through the ice. The UAV’s aerodynamic stability is also considered by meeting lift requirements, producing enough thrust, and having battery capacity left. ...These are constraints in the planner to ensure that the UAV can complete its mission. Benchmark icing cases are constructed to validate that the path planner performs as intended.
Technical Paper

Acoustic Vector Sensors Increasing UAV's Situational Awareness

2009-11-10
2009-01-3249
Acoustic vector sensors (AVS), as they were recently developed based upon acoustic particle velocity sensors may improve the performance of Unmanned Aerial Vehicles (UAV) in terms of automatic take off and landing (ATOL), ground surveillance and mid air anti collision.
Technical Paper

Design, Manufacturing, Testing, and Analysis of a Highly-Constrained Single-Use UAV Wing

2018-10-30
2018-01-1958
Unmanned aerial vehicle (UAV) design aspects are as broad as the missions they are used to support. In some cases, the UAV mission scope can impose design constraints that can be difficult to achieve. ...In some cases, the UAV mission scope can impose design constraints that can be difficult to achieve. This paper describes recent work performed at West Virginia University (WVU) to support repeated flight testing of a single-use UAV platform with emphasis on the highly specialized wings required to help meet the overall airframe mass properties constrained by the project sponsor. ...This paper describes recent work performed at West Virginia University (WVU) to support repeated flight testing of a single-use UAV platform with emphasis on the highly specialized wings required to help meet the overall airframe mass properties constrained by the project sponsor.
Journal Article

Modeling and Simulation Enabled UAV Electrical Power System Design

2011-10-18
2011-01-2645
With the diversity of mission capability and the associated requirement for more advanced technologies, designing modern unmanned aerial vehicle (UAV) systems is an especially challenging task. In particular, the increasing reliance on the electrical power system for delivering key aircraft functions, both electrical and mechanical, requires that a systems-approach be employed in their development. ...However, effective systems-level simulation of complex UAV power systems presents many challenges, which must be addressed to maximize the value of such methods. ...This paper presents the initial stages of a power system design process for a medium altitude long endurance (MALE) UAV focusing particularly on the development of three full candidate architecture models and associated technologies.
Technical Paper

CFRP Crash Absorbers in Small UAV: Design and Optimization

2015-09-15
2015-01-2461
This new kind of very light crash absorber can be used in small UAV to reduce the crash loads in the avionic and payload bay. With reference to a small UAV designed and manufactured at University of Bologna, an optimization of the crash absorbers positions has been carried out in order to achieve the best results in terms of energy dissipation. ...The high number of hull losses is a main concern in the UAV field, mostly due to the high cost of on-board equipment. A crashworthiness design can be helpful to control the extent and position of crash impact damage, minimizing equipment losses. ...This paper presents the outcome of a set of tests carried out to achieve a controlled crush of UAV structures, and to maximize the Specific Energy Absorption. In this work, a small-scale experimental test able to characterize the energy absorption of a Carbon-fiber-reinforced polymer under compression was developed introducing self-supporting sinusoidal shape specimens, which avoid the need for complex anti-buckling devices.
Technical Paper

High Payload Fraction UAV Design and Performance Evaluation

2024-06-01
2024-26-0442
The requirements included maintaining a thrust-to-empty weight ratio below 1 and achieving a high payload fraction, calculated as the ratio of payload weight to total UAV weight. An optimization approach was introduced, altering the conventional UAV sizing process to enhance the payload fraction. ...Unmanned Aerial Vehicles (UAVs), or drones, are aerial platforms with diverse applications. Their design is shaped by specific constraints, driving a multidisciplinary, iterative process encompassing aerodynamics, structures, flight mechanics and other domains. ...This paper describes the design of a fixed-wing UAV tailored to competition requirements. The payload comprises golf balls with specific weight and dimensions.
Technical Paper

Identification of an Electric UAV Propulsion System in Icing Conditions

2023-06-15
2023-01-1378
In-flight atmospheric icing is a severe hazard for propeller-driven unmanned aerial vehicles (UAVs) that can lead to issues ranging from reduced flight performance to unacceptable loss of lift and control. ...To address this challenge, a physics-based first principles model of an electric UAV propulsion system is developed and identified in varying icing conditions. Specifically, a brushless direct current motor (BLDC) based propeller system, typical for UAVs with a wing span of 1-3 meters, is tested in an icing wind tunnel with three accreted ice shapes of increasing size. ...Specifically, a brushless direct current motor (BLDC) based propeller system, typical for UAVs with a wing span of 1-3 meters, is tested in an icing wind tunnel with three accreted ice shapes of increasing size.
Technical Paper

Composite Structural Health Monitoring for MALE UAV Application

2013-09-17
2013-01-2159
In order to achieve the low weigh target in the MALE UAV structures, the SHM project has the target to setup a system that, being able to evaluate the current state of the structure, will enable minus conservative assumption in the composite structural design. ...The application on MALE UAV prototype will be done also considering the STANAG 4671 (USAR) NATO airworthiness regulation.
Technical Paper

A Possible Adaptive Wing Apparatus for New UAV Configurations

2015-09-15
2015-01-2463
The lifting surface modification is more stringent in those cases, such as UAV configurations, where the installed power is limited but the variety of operative scenario is wider than in conventional aircraft. ...The evaluation of the extension of such an idea to UAV wing structure will be presented and discussed.
Journal Article

Performance of Isolated UAV Rotors at Low Reynolds Number

2020-03-10
2020-01-0046
Vertical takeoff and landing vehicle platforms with many small rotors are gaining importance for small UAVs as well as distributed electric propulsion for larger vehicles. To predict vehicle performance, it must be possible to gauge interaction effects. ...As a first step, two identical commercial UAV rotors from a flight test program are studied in isolation, experimentally and computationally.
Technical Paper

Hybrid Propulsion System Design of a VTOL Tailsitter UAV

2008-08-19
2008-01-2242
Tailsitter UAVs with their combined vertical take off and landing (VTOL) and fixed-wing aircraft with full flight-speed regime capability provides a distinct alternative to rotary-wing and ducted fan UAVs (OAVs). ...Tailsitter UAVs with their combined vertical take off and landing (VTOL) and fixed-wing aircraft with full flight-speed regime capability provides a distinct alternative to rotary-wing and ducted fan UAVs (OAVs). ITU-BYU Tailsitter concept aims to obtain the energy efficient regimes across the VTOL and the cruising flight regimes.
Technical Paper

Expanding the Small UAV Design Space with Inflatable Wings

2007-09-17
2007-01-3911
The paper presents work on development, testing and vehicle integration of inflatable wings for small UAVs. Recent advances in the design of inflatable lifting surfaces have removed previous deterrents to their use and multiple wing designs have been successfully flight tested on UAVs. ...Recent advances in the design of inflatable lifting surfaces have removed previous deterrents to their use and multiple wing designs have been successfully flight tested on UAVs. Primary benefits of inflatable wings include stowability (deploy upon command) and robustness (highly resistant to damage). ...This paper discusses these advantages and disadvantages of inflatable wings for use in UAVs, particularly those designs focusing on small vehicles and use in extreme environments.
Technical Paper

UAV Icing: Intercycle Ice Effects on Aerodynamic Performance

2023-06-15
2023-01-1400
Atmospheric in-flight icing poses a challenge to all aircraft including unmanned aerial vehicles (UAVs). Aircraft should avoid icing conditions unless they have ways of mitigating the negative effects of icing, e.g., if they are equipped with an ice protection system (IPS). ...Considering these results during the development and operation of an IPS will help to improve the range and endurance of UAVs in icing conditions.
Technical Paper

Mission Planning for UAV Sensing Tasks in Close Proximity Environments

2007-09-17
2007-01-3846
Unmanned aerial vehicles (UAVs) stand to play a significant role in future sensing and information gathering missions. The scope of these mission scenarios is expanding to include those missions for which the sensor and carrier vehicle will be in close proximity to the surrounding environment, such as in urban operations.
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