scholarly journals Integration of Micro-Structured Photovoltaic Cells into the Ultra-Light Wing Structure for Extended Range Unmanned Aerial Vehicles

2021 ◽  
Vol 11 (22) ◽  
pp. 10890
Author(s):  
Octavian Narcis Ionescu ◽  
Ileana Cernica ◽  
Elena Manea ◽  
Catalin Parvulescu ◽  
Alin Istrate ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Photovoltaic Cells ◽  
Flight Time ◽  
Open Market ◽  
Aerial Vehicles ◽  
Long Time ◽  
Wing Structure ◽  
Infrastructure Inspection ◽  
Reliable Solution ◽  
In The Beginning

There have been large developments in the unmanned aerial vehicles (UAV) industry over the last decade. Although UAV development was mainly for military related use in the beginning and despite there being fear surrounding the release of this technology to the open market for quite a long time, nowadays, there are a variety of applications where UAVs are used extensively, such as in agriculture, infrastructure inspection and monitoring, mobile retranslation relays for communications, etc. One of the weaknesses of electrically propelled UAVs is flight autonomy; there is often a difficult trade-of between the weight of the payload, batteries, and surface to be surveyed that is necessary to determine. There have been many attempts to use photovoltaic cells to increase the flight time for UAVs; however, a reliable solution has not yet been developed. The present paper presents improvements that have been conducted to extend the autonomy of electrically derived UAVs: instead of gluing photovoltaic cells on the wings, the new approach embeds the solar cells into the wing structure as well as develops a new wing that is significantly lighter to compensate for the weight added by the photovoltaic cells. It was demonstrated that by using this approach, a 33% increase in the flight time can be achieved with only one modified wing in a prototype vehicle.

scholarly journals Practical Endurance Estimation for Minimizing Energy Consumption of Multirotor Unmanned Aerial Vehicles

Energies ◽  
2018 ◽  
Vol 11 (9) ◽  
pp. 2221 ◽  
Author(s):  
Myeong-hwan Hwang ◽  
Hyun-Rok Cha ◽  
Sung Yong Jung
Keyword(s):  
Drag Coefficient ◽  
Unmanned Aerial Vehicles ◽  
Estimation Method ◽  
Flight Test ◽  
Flight Time ◽  
Average Error ◽  
Practical Applications ◽  
Aerial Vehicles ◽  
Vehicle Shape ◽  
Battery Discharge

The practically applicable endurance estimation method for multirotor unmanned aerial vehicles (UAVs) using a battery as a power source is proposed. The method considers both hovering and steady-level flights. The endurance, thrust, efficiency, and battery discharge are determined with generally available data from the manufacturer. The effects of the drag coefficient related to vehicle shape and payload weight are examined at various forward flight speeds. As the drag coefficient increases, the optimum speed at the minimum required power and the maximum endurance are reduced. However, the payload weight causes an opposite effect, and the optimal flying speed increases with an increase in the payload weight. For more practical applications for common users, the value of S × Cd is determined from a preliminary flight test. Given this value, the endurance is numerically estimated and validated with the measured flight time. The proposed method can successfully estimate the flight time with an average error of 2.3%. This method would be useful for designers who plan various missions and select UAVs.

TECHNOLOGICAL RESPONSE OF PORT SECURITY TO THREATS POSED BY UNMANNED AERIAL VEHICLES

2020 ◽  
Vol XIII ◽  
pp. 2-3
Author(s):  
Michał Świeczkowski
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Port Security ◽  
Aerial Vehicles ◽  
Best Response ◽  
In The Beginning

In the article author described technological response of port security structures to threats posed by unmanned aerial vehicles. In the beginning author presented world and polish drone market to show take scale of the issue. Then identified threats from unmanned aerial vehicles and adapted to conditions of Port of Gdynia Authority S.A. Afterwards author presented selected, current anti-drones systems and implications related to attempt to secure port against UAV. Based of analysis and solutions applied and planed by Port of Gdynia Authority S.A. author proved that anti-drones systems are the best response of seaports for threats from unmanned aerial vehicles

Multiobjective Mission Planning for UAV under Uncertain Environment

2014 ◽  
Vol 556-562 ◽  
pp. 4435-4438
Author(s):  
Jing Yao Zhu ◽  
Qi Fang He ◽  
Tie Zhu Wang ◽  
Zu Tong Wang
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Uncertainty Theory ◽  
Multiobjective Programming ◽  
Flight Time ◽  
Programming Method ◽  
Mission Planning ◽  
Planning Problem ◽  
Uncertain Environment ◽  
Aerial Vehicles ◽  
Combat Environment

The combat environment of Unmanned Aerial Vehicles (UAVs) is filled with uncertain factors, which is complex and dynamic. This paper is devoted to the UAV mission planning problem under uncertain environment with three optimization objectives, such as flight time, fuel usage and threat imposed by enemy. Based on the uncertainty theory and multiobjective programming method, the UAV uncertain multiobjective mission plaaning model is built and solved.

Endurance improvement by battery dumping strategy considering Peukert effect for electric-powered disposable UAVs

2020 ◽  
Vol 125 (1283) ◽  
pp. 42-59
Author(s):  
X. Feng ◽  
Y. Sun ◽  
M. Chang ◽  
J. Bai
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Load Capacity ◽  
Lift Coefficient ◽  
Weight Ratio ◽  
Analysis Method ◽  
Dead Weight ◽  
Aerial Vehicles ◽  
Battery Packs ◽  
Sensitivity Analysis Method ◽  
Long Time

ABSTRACTElectric-powered disposable unmanned aerial vehicles (UAVs) have wide applications due to their advantages in terms of long time flight and load capacity. Thus, improving their endurance has become an important task to enhance the performance of these UAVs. To achieve this, we investigated a battery dumping strategy which splits the battery into several packs that are used and dumped in sequence to reduce the dead weight. The Peukert effect is also considered. In this paper, the sensitivity analysis method was employed to analyse the endurance benefits for different battery weight ratios, Peukert constants and capacities, quantitatively. The results show that the endurance benefits are significantly affected by all three parameters. For ideal batteries, the endurance can be improved by 20% and 28% respectively when employing a double-pack or triple-pack battery strategy (for a battery weight ratio of 0.4), but these benefits will fall rapidly if the Peukert constant exceeds 1.0 or the battery weight declines. Besides, the endurance will be 10% longer if the lift coefficient rather than the velocity remains constant after the battery packs are dumped at a Peukert constant of 1.2.

scholarly journals CAMERA CALIBRATION FOR UAV APPLICATION USING SENSOR OF MOBILE CAMERA

2015 ◽  
Vol XL-4/W5 ◽  
pp. 239-242
Author(s):  
Y. Takahashi ◽  
H. Chikatsu
Keyword(s):  
Magnetic Field ◽  
Unmanned Aerial Vehicles ◽  
Camera Calibration ◽  
Low Cost ◽  
3D Models ◽  
Flight Time ◽  
Test Target ◽  
Analysis Software ◽  
Aerial Vehicles ◽  
Short Flight

Recently, 3D measurements using small unmanned aerial vehicles (UAVs) have increased in Japan, because small type UAVs is easily available at low cost and the analysis software can be created the easily 3D models. However, small type UAVs have a problem: they have very short flight times and a small payload. In particular, as the payload of a small type UAV increases, its flight time decreases. Therefore, it is advantageous to use lightweight sensors in small type UAVs. <br><br> A mobile camera is lightweight and has many sensors such as an accelerometer, a magnetic field, and a gyroscope. Moreover, these sensors can be used simultaneously. Therefore, the authors think that the problems of small UAVs can be solved using the mobile camera. <br><br> The authors executed camera calibration using a test target for evaluating sensor values measured using a mobile camera. Consequently, the authors confirmed the same accuracy with normal camera calibration.

scholarly journals Disaster Reconnaissance Using Multiple Small Unmanned Aerial Vehicles

2019 ◽  
Vol 141 (06) ◽  
pp. S7-S11
Author(s):  
Jeffrey C. Derricott ◽  
Jacob B. Willis ◽  
Cameron K. Peterson ◽  
Kevin W. Franke ◽  
John D. Hedengren
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Data Storage ◽  
3D Model ◽  
3D Models ◽  
Flight Time ◽  
High Fidelity ◽  
Computational Power ◽  
Government Officials ◽  
Aerial Vehicles ◽  
Before And After

Small rotorcraft unmanned air vehicles (sUAVs) are valuable tools in solving geospatial inspection challenges. One area where this is being widely explored is disaster reconnaissance [1]. Using sUAVs to collect images provides engineers and government officials critical information about the conditions before and after a disaster [2]. This is accomplished by creating high- fidelity 3D models from the sUAV’s imagery. However, using an sUAV to perform inspections is a challenging task due to constraints on the vehicle’s flight time, computational power, and data storage capabilities [3]. The approach presented in this article illustrates a method for utilizing multiple sUAVs to inspect a disaster region and merge the separate data into a single high-resolution 3D model.

Análisis Y Diseño De Una Aeronave No Tripulada Para Uso Agrícola

2017 ◽  
Vol 13 (6) ◽  
pp. 135
Author(s):  
Javier Enrique Orna Chávez ◽  
Otto Fernando Balseca Sampedro ◽  
Jorge Isaías Caicedo Reyes ◽  
Diego Fernando Mayorga Pérez ◽  
Edwin Fernando Viteri Núñez ◽  
...  
Keyword(s):  
Composite Materials ◽  
Carbon Fiber ◽  
Unmanned Aerial Vehicles ◽  
Power Supply ◽  
Agricultural Sector ◽  
Flight Time ◽  
Unmanned Aircraft ◽  
Commercial Application ◽  
Autonomous Flight ◽  
Aerial Vehicles

The present research proposes to diversify the use of unmanned aerial vehicles (UAV) with rotating wings for applications in the agricultural sector. For this we have analyzed and designed an unmanned aircraft. In first instance the applications of this type of aircraft in this sector were reviewed to determine possible design conditions that would aid in the sizing and design of the aircraft. Once the requirements had been determined, aerodynamic analysis was carried out to size up and launch the required power output for the craft. This in order to optimize the weight and autonomous fight time to finally design an aircraft prototype built in carbon fiber with the aid of fault theories as applied to composite materials. At the end of the research, an unmanned aircraft of 6 rotors, each with an installed power supply of 700W was designed. The aircraft has an autonomous flight time of 40 minutes without a payload, 20 minutes with a payload of 3Kg, and 8 minutes with a payload of 5Kg. The commercial application of these aircraft are the monitoring of land and fumigation in inaccessible areas.

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