Mars Science Helicopter: Compelling Science Enabled by an Aerial Platform

In this paper, we derive the link budget relations for communications assisted by reconfigurable smart surfaces (RSS). Specifically, under specular and scattering paradigms, we provide link budget expressions for an RSS-assisted communication on the ground, where the RSS is either mounted on a building, or on an aerial platform, such as an unmanned aerial vehicle (UAV), a high altitude platform station (HAPS), or a low-earth orbit satellite (LEO). The obtained numerical results provide design guidelines for RSS-assisted communication systems, including the recommended aerial platform to use, the size of RSS for each type of the platforms, and the operating frequencies.

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Wind Gust Measuring at Low Altitude Using An Unmanned Aerial System

10.32920/ryerson.14653290 ◽

2021 ◽

Author(s):

Alton Yeung

Keyword(s):

Turbulence Models ◽

Satellite System ◽

Data System ◽

Measurement Unit ◽

Wind Gust ◽

Wind Gusts ◽

Low Altitude ◽

And Performance ◽

Global Navigation Satellite ◽

Aerial Platform

A small unmanned aerial vehicle (UAV) was developed with the specific objective to explore atmospheric wind gusts at low altitudes within the atmospheric boundary layer (ABL). These gusts have major impacts on the flight characteristics and performance of modern small unmanned aerial vehicles. Hence, this project was set to investigate the power spectral density of gusts observed at low altitudes by measuring the gusts with an aerial platform. The small UAV carried an air-data system including a fivehole probe that was adapted for this specific application. The air-data system measured the local wind gusts with an accuracy of 0.5 m/s by combining inputs from a five-hole probe, an inertial measurement unit, and Global Navigation Satellite System (GNSS) receivers. Over 20 flights were performed during the development of the aerial platform. Airborne experiments were performed to collect gust data at low altitudes between 50 m and 100 m. The result was processed into turbulence spectrum and the measurements were compared with the MIL-HDBK-1797 von K´arm´an turbulence model and the results have shown the model underpredicted the gust intensities experienced by the flight vehicle. The anisotropic properties of low-altitude turbulence were also observed when analyzing the measured gusts spectra. The wind and gust data collected are useful for verifying the existing turbulence models for low-altitude flights and benefit the future development of small UAVs in windy environment.

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Structural Analysis of the Lower Frame in the Multi-aerial Platform

Journal of the Korea Society for Simulation ◽

10.9709/jkss.2015.24.3.069 ◽

2015 ◽

Vol 24 (3) ◽

pp. 69-75

Author(s):

Sung-Soo Kang

Keyword(s):

Structural Analysis ◽

Lower Frame ◽

Aerial Platform

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Design Optimization of the Aerial Lift Boom through the Finite-Element Analysis (FEA)

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.295-297.1564 ◽

2011 ◽

Vol 295-297 ◽

pp. 1564-1567

Author(s):

Yong Hong ◽

Seokjun Yu ◽

Jaejung Lee ◽

Hyeonsu Ha ◽

Dong Pyo Hong

Keyword(s):

Finite Element Analysis ◽

Finite Element ◽

Design Optimization ◽

Experimental Method ◽

General Purpose ◽

Element Analysis ◽

Actual Experiment ◽

Multi Stage ◽

The Finite Element Analysis ◽

Aerial Platform

The multi-stage boom consisting of several booms is used in order to develop the aerial platform truck that can be used in a working radius that is higher and safe. Because the length increases compared with the width or the height of the structure, the intensity and rigidity are lowered along with the safety. Accordingly, a countermeasure is needed. Therefore, in this research, when designing of the high ground work difference Boom System, the safety the stress of the considered boom the analyze method and experimental method tries to be evaluated through the comparison. The finite-element analysis(FEA) compared the Strain value which is obtained through the resolution value and actual experiment by using the Ansys,that is the general purpose program, and proved this safety.

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Unmanned aerial platform-based multi-spectral imaging for field phenotyping of maize

Plant Methods ◽

10.1186/s13007-015-0078-2 ◽

2015 ◽

Vol 11 (1) ◽

Cited By ~ 122

Author(s):

M Zaman-Allah ◽

O Vergara ◽

J L Araus ◽

A Tarekegne ◽

C Magorokosho ◽

...

Keyword(s):

Spectral Imaging ◽

Field Phenotyping ◽

Aerial Platform

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Aerial Contact Manipulation With Soft End-Effector Compliance and Inverse Kinematic Compensation

Journal of Mechanisms and Robotics ◽

10.1115/1.4048831 ◽

2020 ◽

Vol 13 (1) ◽

Author(s):

Xinjun Sheng ◽

Zhao Ma ◽

Ningbin Zhang ◽

Wei Dong

Keyword(s):

Degrees Of Freedom ◽

Position Control ◽

Mechanical Design ◽

Impact Resistance ◽

High Strength ◽

Inverse Kinematic ◽

End Effector ◽

Precise Position ◽

Positioning Errors ◽

Aerial Platform

Abstract This paper presents the development of a six degrees-of-freedom manipulator with soft end-effector and an inverse kinematic compensator for aerial contact manipulation. Realizing the fact that aerial manipulators can hardly achieve precise position control, a compliant manipulator with soft end-effector is first developed to moderate end-effector positioning errors. The manipulator is designed to be rigid-soft combined. The rigid robotic arm employs the lightweight but high-strength materials. The compliance requirement is achieved by the soft end-effector so that the mechanical design for the joints are largely simplified. These two features are beneficial to lighten the arm and to ensure the accuracy. In the meantime, the pneumatic soft end-effector can further moderate the probable insufficient accuracy by endowing the manipulator with compliance for impact resistance and robustness to positioning errors. With the well-designed manipulator, an inverse kinematic compensator is then proposed to eliminate lumped disturbances from the aerial platform. The compensator can ensure the stabilization of the end-effector by using state estimation from the aerial platform, which is robust and portable as the movement of the platform can be reliably obtained. Both the accuracy and compliance have been well demonstrated after being integrated into a hexarotor platform, and a representative scenario aerial task repairing the wind turbine blade-coating was completed successfully, showing the potential to accomplish complex aerial manipulation tasks.

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