scholarly journals EVALUATION OF SMALL UNMANNED AIRCRAFT FLIGHT TRAJECTORY ACCURACY / IŠORINIŲ FAKTORIŲ ĮTAKOS NEDIDELIO AUTONOMINIO ORLAIVIO SKRYDŽIO TRAJEKTORIJOS TIKSLUMUI VERTINIMAS

2014 ◽  
Vol 6 (5) ◽  
pp. 577-582
Author(s):  
Ramūnas Kikutis ◽  
Jonas Stankūnas
Keyword(s):  
Theoretical Calculations ◽  
High Reliability ◽  
Unmanned Aircraft ◽  
Flight Path ◽  
Flight Trajectory ◽  
Circular Trajectory ◽  
Aircraft Flight ◽  
Air Space ◽  
Wind Influence ◽  
Main Factors

Today small unmanned aircraft are being more widely adapted for practical tasks. These tasks require high reliability and flight path accuracy. For such aircraft we have to deal with the chalenge how to compensate external factors and how to ensure the accuracy of the flight trajectory according to new regulations and standards. In this paper, new regulations for the flights of small unmanned aircraft in Lithuanian air space are discussed. Main factors, which affect errors of the autonomous flight path tracking, are discussed too. The emphasis is on the wind factor and the flight path of Dubbin’s trajectories. Research was performed with mathematical-dynamic model of UAV and it was compared with theoretical calculations. All calculations and experiments were accomplished for the circular part of Dubbin’s paths when the airplane was trimmed for circular trajectory flight in calm conditions. Further, for such flight the wind influence was analysed. Nedideli autonominiai orlaiviai yra vis plačiau pritaikomi praktinėms užduotims, kurioms reikalingas aukštas skrydžio patikimumas bei trajektorijos tikslumas, vykdyti. Kuriant bei naudojant tokius orlaivius, reikia vertinti egzistuojančių standartų bei taisyklių reikalavimus ir išorinių faktorių įtaką skrydžių trajektorijos tikslumui. Darbe aptariamos naujausios skrydžių autonominiais orlaiviais Lietuvoje taisyklės bei pagrindiniai faktoriai, darantys įtaką skrydžio trajektorijos paklaidoms. Darbe didžiausias dėmesys skirtas vėjo faktoriaus įtakos skrydžio trajektorijai vertinti, kai automatinio valdymo sistema nesiima koreguojamųjų veiksmų. Tyrimas atliktas remiantis teoriniais skaičiavimais bei traktuojant, kad orlaivis – taškinis kūnas. Šie rezultatai palyginti su gautaisiais panaudojus orlaivio dinaminį modelį.

Simplex Methods for Optimal Control of Unmanned Aircraft Flight Trajectories

2017 ◽  
Author(s):  
Michael D. Zollars ◽  
Richard G. Cobb
Keyword(s):  
Delaunay Triangulation ◽  
Unmanned Aircraft ◽  
Collocation Methods ◽  
Barycentric Coordinates ◽  
Flight Trajectory ◽  
Orthogonal Collocation ◽  
Aircraft Flight ◽  
Constrained Delaunay Triangulation ◽  
Flight Trajectories ◽  
Aircraft System

The feasibility of using a constrained Delaunay triangulation method for determining optimal flight trajectories of unmanned air vehicles in a constrained environment is explored. Current methods for developing optimal flight trajectories have yet to achieve computational times that allow for real-time implementation. The proposed method alleviates the dependency of problem specific parameters while eliminating constraints on the Non-Linear Program. Given an input of obstacles with n vertices, a constrained Delaunay triangulation is performed on the space. Converting the vertices of the triangulation to barycentric coordinates on a phased approach defines the state bounds and max time for each phase. With two-dimensional aircraft dynamics, direct orthogonal collocation methods are performed to compute the optimal flight trajectory. Results illustrate computational times and feasibility of Small Unmanned Aircraft System flight trajectories through polygon constraints.

scholarly journals Optimization of an aircraft flight trajectory in the GLONASS dynamic accuracy field

2019 ◽  
Vol 22 (5) ◽  
pp. 19-31
Author(s):  
O. N. Skrypnik ◽  
E. E. Nechaev ◽  
N. G. Arefyeva ◽  
R. O. Arefyev
Keyword(s):  
Traffic Management ◽  
Flight Path ◽  
Navigation Systems ◽  
Field Variation ◽  
Flight Trajectory ◽  
Aircraft Flight ◽  
Geometric Dilution Of Precision ◽  
Satellite Navigation Systems ◽  
The Cost ◽  
Theory Of Graphs

The authors consider the problem of optimization of aircraft flight trajectories in air traffic management (ATM) on the basis of flexible routing technologies which involve the use of satellite navigation systems (SNS). It is shown that in optimizing a trajectory it is necessary to take into account the accuracy of track holding during the flight which depends on the accuracy of the navigation system and external flight path disturbances, e.g. wind. For solving the task of optimization the authors propose to use the theory of graphs. The technique of constructing a dynamic SNS accuracy field and representing it as a graph was developed. It is proposed that the SNS field be characterized by geometric dilution of precision changing both in space and in time. Based on the theory of graphs (A-star algorithm) the technique of constructing a trajectory of optimal length with changing the SNS accuracy and external flight path disturbances is proposed. The criterion of optimization based on minimizing the true track is offered. The cost function taking into account the track holding accuracy in navigating by SNS and effects of external flight disturbances is justified. The article presents the results of A-star algorithm application for constructing an optimal flight trajectory under conditions of SNS accuracy field variation and presence of prohibited zones in the provided airspace.

An On-Demand Weather Avoidance System for Small Aircraft Flight Path Routing

2020 ◽  
pp. 311-319
Author(s):  
Eric Lyons ◽  
David Westbrook ◽  
Andrew Grote ◽  
George Papadimitriou ◽  
Komal Thareja ◽  
...  
Keyword(s):  
Flight Path ◽  
Aircraft Flight ◽  
On Demand ◽  
Small Aircraft

scholarly journals Effect of the spherical hollow space on the aircraft path

2017 ◽  
pp. 63-68
Author(s):  
R. N. Bukhtin
Keyword(s):  
Surface Pressure ◽  
Gas Flow ◽  
Flow Simulation ◽  
Flight Path ◽  
Analytical Dependence ◽  
Initial Speed ◽  
Pressure Force ◽  
Aircraft Flight ◽  
Hollow Space ◽  
Spherical Hollow

The paper shows the research results of the effect of a spherical hollow space on the aircraft flight path. By flow simulation of the hollow space, there was plotted an analytical dependence of the surface pressure force on the parameters of the oncoming gas flow. The aircraft deflection caused by the presence of a spherical hollow space is estimated depending on its position, the initial speed of flight and the pitch attitude

The Case of Failure Analysis of the PCBA Wire Corrosion under High Reliability Requirements

2019 ◽  
Vol 2019 (1) ◽  
pp. 000369-000372
Author(s):  
Jie Zheng ◽  
Yabing Zou ◽  
Ying Yang ◽  
Jianghua Shen ◽  
Yingjie Zhang
Keyword(s):  
Cross Section ◽  
Ion Chromatography ◽  
Visual Inspection ◽  
High Reliability ◽  
Cleaning Process ◽  
Chromatography Analysis ◽  
Wave Soldering ◽  
Bromide Ion ◽  
Main Factors ◽  
Type Of Failure

Abstract The wire breakage of a no-cleaning process PCBA occurs at the beginning of the application. Through visual inspection, cross-section, SEM & EDS, and ion chromatography analysis, it was found that the high content of ions (bromide ion) on the surface of the solder source side caused corrosion and fracture of the conductors of wave soldering surface, this article also analyzes the source of bromide ion and conclude the main factors involved in this type of failure.

The simulation of flight trajectory based on quasi-Newton and mesh simplification

2019 ◽  
Vol 33 (26) ◽  
pp. 1950311
Author(s):  
Yangyong Guo ◽  
Xiaoling Gao ◽  
Juan Wei ◽  
Jierui Wang ◽  
Mei Li ◽  
...  
Keyword(s):  
Prediction Accuracy ◽  
Simulation Experiment ◽  
Prediction Method ◽  
Mesh Simplification ◽  
Flight Trajectory ◽  
Key Factors ◽  
Aircraft Flight ◽  
Factors Influencing ◽  
Calculation Process ◽  
Quasi Newton

To address the problem of low accuracy of aircraft flight trajectory, a new prediction method for flight trajectory is proposed based on the quasi-Newton and mesh simplification algorithm. This method firstly proposes the calculation method of 3D aircraft flight trajectory, and simplifies the calculation process with mesh simplification algorithm. At the same time, the prediction accuracy is further improved with the quasi-Newton algorithm. At last, through the simulation experiment, we have made a deep study of the key factors influencing the prediction method. The result has shown that the method has good adaptability.

Detection of Conflicts Between ADS-B-Equipped Aircraft and Unmanned Aerial Systems

2020 ◽  
Vol 2674 (1) ◽  
pp. 197-204
Author(s):  
John H. Mott ◽  
Zachary A. Marshall ◽  
Mark A. Vandehey ◽  
Mike May ◽  
Darcy M. Bullock
Keyword(s):  
High Performance ◽  
Low Cost ◽  
Federal Aviation Administration ◽  
Unmanned Aircraft ◽  
Sensor Technology ◽  
Unmanned Aerial Systems ◽  
Aircraft Flight ◽  
Flight Operations ◽  
Aerial Systems ◽  
Operational Simplicity

Versatile unmanned aerial system (UAS) platforms have grown significantly in popularity by virtue of their low cost relative to manned aircraft, high performance, and operational simplicity. While the Federal Aviation Administration (FAA) currently regulates the operating altitudes, speeds, weights, pilot qualifications, and locations of drones, a lack of capacity and technology prohibits sufficient enforcement of these restrictions. To assess the frequency and severity of manned and unmanned aircraft separation incidents, and to examine the emerging sensor technology available to facilitate such assessment, flight operations in controlled airspace around Orlando Melbourne International Airport (KMLB) were monitored. One sensor system deployed at KMLB reported UAS locations, altitudes, and flight durations, while a second system reported manned aircraft positions, altitudes, and timestamps using ADS-B signals. Evaluation of flight operations data in the vicinity of KMLB revealed eight potential drone incursions over a 2-week period. Aircraft flight paths were retroactively tracked to map these unmanned and manned aerial conflicts; aircraft identification information was also researched to contextualize the incidents. The frequency and magnitude of identified events suggest the need for additional research to further explore the problem scope and potential solutions.

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