MULTIDIMENSIONAL SIMULATIONS AND TEST FIRES OF A HYDROGEN-FUELED RAMJET WITH AN ANNULAR DETONATIVE COMBUSTOR AT APPROACHING AIR FLOW OF MACH 2 AND 1.5

2020 ◽  
Author(s):  
V. S. IVANOV ◽  
◽  
V. S. AKSENOV ◽  
S. M. FROLOV ◽  
P. A. GUSEV ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
High Speed ◽  
Constant Pressure ◽  
Air Flow ◽  
Thermodynamic Cycle ◽  
Aerial Vehicles ◽  
Mach Numbers

Modern high-speed unmanned aerial vehicles are powered with small-size turbojets or ramjets. Existing ramjets operating on the thermodynamic cycle with de§agrative combustion of fuel at constant pressure are efficient at flight Mach numbers M ranging from about 2 to 6.

Design and flight-stability analysis of a closed fixed-wing unmanned aerial vehicle formation controller

2018 ◽  
Vol 233 (8) ◽  
pp. 1045-1054 ◽  
Author(s):  
Jialong Zhang ◽  
Bing Xiao ◽  
Maolong Lv ◽  
Qiang Zhang
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Collision Avoidance ◽  
High Speed ◽  
Physical Simulation ◽  
Controller Design ◽  
Formation Flight ◽  
External Factors ◽  
Flight Stability ◽  
Aerial Vehicles ◽  
Closed Formation

This article addresses a flight-stability problem for the multiple unmanned aerial vehicles cooperative formation flight in the process of the closed and high-speed flight. The main objective is to design a cooperative formation controller with known external factors, and this controller can keep the consensus of attitude and position and reduce the communication delay between any two unmanned aerial vehicles and increase unmanned aerial vehicles formation cruise time under the known external factors. Known external factors are taken into consideration, and longitude maneuvers using nonlinear thrust vectors were employed with unsteady aerodynamic models, according to the attitude and position of unmanned aerial vehicles, which were employed as corresponding input signals for studying the dynamic characteristics of unmanned aerial vehicles formation flight. In addition, the relative distance between any two unmanned aerial vehicles was not allowed to exceed their safe distance so that the controller could perform collision avoidance. An analysis of formation flight distance error shows that it converged to a fixed value that well ensured unmanned aerial vehicles formation flight stability. The experimental results show that the controller can improve the speed of a closed formation effectively and maintain the stability of formation flight, which provides a method for closed formation flight controller design and collision avoidance for any two unmanned aerial vehicles. Meanwhile, the effectiveness of proposed controller is fully proved by semi-physical simulation platform.

scholarly journals Angle of Attack Sensor for Small Fixed-Wing Unmanned Aerial Vehicles

Proceedings ◽  
2020 ◽  
Vol 39 (1) ◽  
pp. 19
Author(s):  
Wanngoen ◽  
Saetunand ◽  
Saengphet ◽  
Tantrairatn
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Flow Direction ◽  
Air Flow ◽  
Angle Of Attack ◽  
Flight Test ◽  
Unmanned Aircraft ◽  
Aerodynamic Parameter ◽  
Aerial Vehicles ◽  
Flow Changes ◽  
Good Agreement

The angle of attack (AOA) is an important parameter for estimating aerodynamic parameter the performance and stability of aircraft. Currently, AOA sensors are used in general aircraft. However, there is no a reasonable-price AOA sensor that is compatible to a small fixed-wing unmanned aerial vehicles (UAVs). This research aims to designs and constructs angle of attract (AOA) sensor for small fixed-wing unmanned aircraft. Mechanism Design, which is similar to aerodynamic wheatear vane, can operate in airspeed 10–30 m/s. The direction of airfoil aligns with the air flow direction. When the AOA of the UAV changes, the air flow changes the direction, resulting in the change of airfoil direction. The high-resolution rotary encoder, that was used to measure the angle of the airfoil, was installed with the fin airfoil. For experiment, the accuracy of the AOA sensor was validated by comparing the angles obtained from the encoder with the standard rotary table in static and wind tunnel. Finally, the AOA sensor, which was attached on aircraft, was verified and recorded in flight test. As the results of the measurement, the airfoil angles detected by the encoder were in good agreement with the standard angles.

scholarly journals ONBOARD PHOTOINTAKES ON THE BASIS OF HIGH-SPEED LOW-FORMAT MATRIXES IN THE INFRARED RANGE

2019 ◽  
Vol 7 ◽  
pp. 22-26
Author(s):  
Andrey Chernikov ◽  
Sergey Kravets ◽  
Vladimir Legky ◽  
Valeriy Edvabnik ◽  
Igor Gibin
Keyword(s):  
Remote Sensing ◽  
Unmanned Aerial Vehicles ◽  
High Speed ◽  
Infrared Range ◽  
Aerial Vehicles ◽  
Spectral Ranges

The analysis of parameters of high-speed small-format matrices operating in the infrared (IR) range is presented. The considered matrices can be placed on unmanned aerial vehicles (UAVs) for remote sensing of underlying surfaces. The types of devices, their purpose, the main spectral ranges and principles of operation are considered.

Design, Optimization and Testing of High-Speed Magnetoelectric Generator for Power Supply of Micro-Unmanned Aerial Vehicles

2018 ◽  
Vol 20 (5) ◽  
pp. 267-276
Author(s):  
A.A. Gerasin ◽  
◽  
F.R. Ismagilov ◽  
V.E. Vavilov ◽  
A.M. Veselov ◽  
...  
Keyword(s):  
Design Optimization ◽  
Unmanned Aerial Vehicles ◽  
Power Supply ◽  
High Speed ◽  
Aerial Vehicles

Design and Implementation of a Compact Rotational Speed and Air Flow Sensor for Unmanned Aerial Vehicles

2019 ◽  
Vol 19 (22) ◽  
pp. 10298-10307 ◽  
Author(s):  
Federico Fries ◽  
Shane Kyi Hla Win ◽  
Emmanuel Tang ◽  
Jun En Low ◽  
Luke Soe Thura Win ◽  
...  
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Rotational Speed ◽  
Air Flow ◽  
Flow Sensor ◽  
Design And Implementation ◽  
Aerial Vehicles

scholarly journals Transformer: A Multifunctional Fast Unmanned Aerial Vehicles–Unmanned Surface Vehicles Coupling System

Machines ◽  
2021 ◽  
Vol 9 (8) ◽  
pp. 146
Author(s):  
Mingzhang Chen ◽  
Xuancheng Zhang ◽  
Xiaoshuang Xiong ◽  
Fanfei Zeng ◽  
Wuhao Zhuang
Keyword(s):  
Unmanned Aerial Vehicles ◽  
High Speed ◽  
Safety Management ◽  
Unmanned Vehicles ◽  
Maritime Transportation ◽  
Water Safety ◽  
Unmanned Surface Vehicles ◽  
Aerial Vehicles ◽  
Coupling System ◽  
Before And After

With the continuous development of the maritime economy, the maritime unmanned surface vehicles (USVs) and unmanned aerial vehicles (UAVs) have become important parts of the maritime transportation system. Unmanned vehicles play a pivotal role in water safety management, offshore patrol and maritime rescue. Consequently, this article researches and develops an unmanned aerial vehicle–unmanned surface vehicle (UAV-USV) coupling system with multiple functions. The ship body module, the deformation module and the UAV module are designed by using the modular analysis method, then volume of fluid (VOF) technology and STAR-CCM+ software are applied to analyze the ship resistance before and after deformation and optimize it. The results show that the Transformer has high speed before deformation and stable navigation ability after deformation, and it can navigate in high winds and waves. It has a large reconnaissance range and some radar stealth capability, which can fulfill different tasks, such as maritime patrol, military strike and maritime rescue.

An Ultra-High-Speed Starter–Generator with a Magnetic Core of Amorphous Iron for Unmanned Aerial Vehicles

2018 ◽  
Vol 89 (1) ◽  
pp. 13-16
Author(s):  
V. E. Vavilov ◽  
O. A. Yushkova ◽  
Yu. V. Rakhmanova ◽  
Yu. V. Afanas’ev ◽  
N. K. Potapchuk
Keyword(s):  
Unmanned Aerial Vehicles ◽  
High Speed ◽  
Magnetic Core ◽  
Amorphous Iron ◽  
Aerial Vehicles ◽  
Ultra High Speed ◽  
Starter Generator
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