Multi-UAV persistent surveillance with basic patrolling pattern in
minimum revisit time
Hassan
Haghighi
author
Seyyed Hossein
Sadati
author
Jalal
Karimi
author
Seyyed Mohammad Mehdi
Dehghan
author
text
article
2018
per
Unmanned aerial vehicles (UAVs) are well-suited to a wide range of mission scenarios, such as searchand rescue, border patrol, and military surveillance. The complex and distributed nature of these missionsoften requires teams of UAVs to work together. Despite the complexity of the environment and patrolprocedures, the persistent surveillance is a one of an important problem in aerial patrol which can besimplified with basic patterns. The main object is minimizing the maximum revisit time in specified path.In this article, the single and multi-agent aerial search and patrol patterns are described and revisit timeequation is driven for known UAV with real model and several situations. The impact of changing speedand the number of agents on the efficiency of persistent surveillance has been evaluated and comparedwith another patrolling pattern. As results of this paper, the basic search methods are distributed to anarbitrary number of the agent in several patterns. The revisit time function as a dependent parameter canbe calculated from agent’s number as an independent parameter also in fixed value of revisit time, theoptimal number of UAVs can be obtained due to specified search area. The results show that in the highspeedsituation, increase the number of UAVs in the particular area, little performance improvementoccurs in minimizing of maximum revisit time. A velocity and UAV number domain can be determinedwhereas the maximum revisit time always is minimal.
Journal of Aeronautical Engineering
Shahid Sattari Aeronautical University of Science and Technology-Iranian Aerospace Society
Director-in-Charge:
Dr. Akbar Cheraqi
Editor-in-Chief:
Dr. Farhad Javidrad
Associate Editor:
Dr. Vahid Khalafi
Website Manager:
Amir Ehsan Zamanian
Eng. Nima Mansour Lakouraj
English Text Editor:
Dr. Roohollah Maleki
17359449
20
v.
1
no.
2018
1
12
https://www.joae.ir/article_121869_78971c1594c464d3bf9a12ef2bab2e6b.pdf
Design and Experimental Test of Alignment Algorithm based on
Inertial Measurement Unit Outputs
Saeed
Mohammad Hoseini
author
Omid
Omidi Hemmat
author
Mohamadtaghi
Sabet
author
text
article
2018
per
In this paper, an alignment algorithm is proposed based on using the outputs of inertial measurement unit (IMU).Accurate initialization of attitude angles containing the azimuth angle is an important step to increase the accuracy ofinertial navigation system output of a moving vehicle. Two step alignment algorithm including course and finecalculation is proposed in this paper which derives the Euler attitude angles including azimuth of vehicle with accuracyof a few arc minutes. First a course alignment is performed based on the components of gravity acceleration and angularvelocity of the earth in body coordinate which are measured by inertial measurement unit sensors. Then the finealignment is performed by constructing an error model of navigation system and estimation of the attitude angles errorusing a Kalman filter. The observations which are feed to the Kalman filter are the velocity components of vehicle innavigation frame and the eastern angular velocity component of the earth which are zero. To evaluate the accuracy ofthe proposed alignment algorithm, the IMU is mounted on a 3DOF table which can be aligned with 5 arc secondprecision as reference attitude. Then the alignment algorithm is executed in several azimuths. The results show theacceptable accuracy of azimuth angle.
Journal of Aeronautical Engineering
Shahid Sattari Aeronautical University of Science and Technology-Iranian Aerospace Society
Director-in-Charge:
Dr. Akbar Cheraqi
Editor-in-Chief:
Dr. Farhad Javidrad
Associate Editor:
Dr. Vahid Khalafi
Website Manager:
Amir Ehsan Zamanian
Eng. Nima Mansour Lakouraj
English Text Editor:
Dr. Roohollah Maleki
17359449
20
v.
1
no.
2018
13
24
https://www.joae.ir/article_121870_8b10a827eb062a04838f36bb6d74ee06.pdf
Low-order Linear Estimation of a Commercial Quadrotor using Flight
Seyyed Mohammad Mahdi
Dehghan
author
Ali
Parsa
author
Alireza
Ahangarani Farahani
author
Ehsan
Ghezelbash
author
text
article
2018
per
In this paper, a functional model, which is identified based on flight test data sets, is used to improve the performanceof guidance loop of a commercial quadrotor equipped with a low-cost autopilot and navigation system. For thispurpose, relationships between horizontal velocities and the quadrotor attitudes around the horizontal axes andrelationships between three quadrotor attitudes with the correspondent commands sent to the autopilot are identifiedindependently. The first model describes the relation between rotation around the axes of the quadrotor with declaredcommands in the autopilot system and the other describes the relation between horizontal velocities with the anglearound the longitudinal and latitudinal axes of the quadrotor. According to the experimental test results, a first ordertransfer function has enough accuracy to describe the rotation around the vertical axis with related commands. Also,the description of the relation between the horizontal velocities and the autopilot commands has suitable accuracyusing two consequent first order transfer functions; one model between the applied commands and changes of rolland pitch angles, and the other between roll and pitch angles and the horizontal velocities. Due to the linear timeinvariant characteristics of the system, the least square estimator is used to estimate unknown parameters of themodels. To evaluate the identified models, the performance of the path tracking using a PID controller as the outercontroller is investigated. The results of the indoor tests show significant improvements in path tracking that confirmsenough accuracy of the identified models.
Journal of Aeronautical Engineering
Shahid Sattari Aeronautical University of Science and Technology-Iranian Aerospace Society
Director-in-Charge:
Dr. Akbar Cheraqi
Editor-in-Chief:
Dr. Farhad Javidrad
Associate Editor:
Dr. Vahid Khalafi
Website Manager:
Amir Ehsan Zamanian
Eng. Nima Mansour Lakouraj
English Text Editor:
Dr. Roohollah Maleki
17359449
20
v.
1
no.
2018
25
35
https://www.joae.ir/article_121871_4092d6af894e040e3c26c9aa1962746b.pdf
Identification of instructor’s competencies in the field of aeronautics: The study of pilot’s instructors at Shahid Sattari Air University
Hassan
Eshrat Abadi
author
text
article
2018
per
The purpose of this study was to identify the factors affecting the competency of pilot’s instructors of at Shahid Sattari Air University. For this purpose, after reviewing the background, the theoretical framework of the research was formulated and then modified by interviewing key experts. The researcher then designed a questionnaire whose validity and reliability were confirmed by statistical techniques and methodology. Then, the questionnaire was distributed among pilot instructors of Shahid Sattari Air University and 68 questionnaires were returned. 61 of them had the necessary requirements for entering the software and formed the basis of research analyses. First-order factor analysis showed that all observed variables had a good load factor on their variable and, according to PLS indices, these observed variables can measure their corresponding latent variables. Also, the results of second-order factor analysis showed that all of the first latent variables had an appropriate factor load and had a significant effect on their second latent variables. In other words, all the components have enough load factors to predict their own variables and can predict the competency of pilot’s instructors at Shahid Sattari Air University and are considered as its underlying factors.
Journal of Aeronautical Engineering
Shahid Sattari Aeronautical University of Science and Technology-Iranian Aerospace Society
Director-in-Charge:
Dr. Akbar Cheraqi
Editor-in-Chief:
Dr. Farhad Javidrad
Associate Editor:
Dr. Vahid Khalafi
Website Manager:
Amir Ehsan Zamanian
Eng. Nima Mansour Lakouraj
English Text Editor:
Dr. Roohollah Maleki
17359449
20
v.
1
no.
2018
36
48
https://www.joae.ir/article_121872_99a9caea379ad0d70c2f2805341e8f86.pdf
Flatter analysis of cylindrical sandwich panel under follower force
using generalized differential quadrature method
Alireza
Pourmoayed
author
Keramat
Malekzadeh Fard
author
Morteza
Shahravi
author
text
article
2018
per
In this research, behavior of a cylindrical sandwich panel with the flexible core in different boundaryconditions, under the influence of follower force are studied. For this purpose, using the theory of thefirst-order shear deformation, and the principle of Hamilton, the governing equations have been extractedand by using generalized differential quadrature method (GDQM) are solved. The obtained resultsindicate that by considering simplicity of present method compared to the other methods in the analysis ofstability problems of the cylindrical sandwich panel, the present results have the acceptable accuracy.Also, the results review show that the flutter phenomenon occurs in the free and clamp boundaryconditions and for other boundary conditions only the divergence phenomenon or static buckling occurs.Another significant result is that increasing the number of composite layers, makes the flutterphenomenon in the cylindrical sandwich panel with the flexible core occurs later.
Journal of Aeronautical Engineering
Shahid Sattari Aeronautical University of Science and Technology-Iranian Aerospace Society
Director-in-Charge:
Dr. Akbar Cheraqi
Editor-in-Chief:
Dr. Farhad Javidrad
Associate Editor:
Dr. Vahid Khalafi
Website Manager:
Amir Ehsan Zamanian
Eng. Nima Mansour Lakouraj
English Text Editor:
Dr. Roohollah Maleki
17359449
20
v.
1
no.
2018
49
61
https://www.joae.ir/article_121873_ab00a4b436f10ffc9c74db4a9de5d98a.pdf
Identification, Categories and risk assessment of the pilot training in job safety analysis
Milad
Darzi Ramandi
author
Alireza
Roudbari
author
text
article
2018
per
Aviation risk assessment and analysis is one of the contributing factors in reducing accident and human and unhuman expenses. Todays, most organizations have recognized but despite this problem in the aviation Training university, there is no specific study in this field. On the other hand, proper training to pilot training student, improving safety and reliability of the aircraft, increasing awareness of pilot professors and other factors in reducing damage can be very effective. Every year, a number of students register in university and aeronautical organizations to learn pilot skills that should be some safety acts to preserve their lives during education. In this paper, identification, documentation and rating of all kinds of risks in pilot training have been made to this end; it is possible to prevent any kind of risk during training by providing a suitable approach. This study uses the Job Safety Analysis to identify and assess the existing or potential risks in pilot training and uses the questionnaire technique to rank the identified risks. The analysis of the risk assessment model showed that each student and Professors have weaknesses that need to be addressed which, in the end, will provide solutions to address these risks and reduce them so that organizations associated with The implementation of this method reduces the risk, incidents and risks of existing ones.
Journal of Aeronautical Engineering
Shahid Sattari Aeronautical University of Science and Technology-Iranian Aerospace Society
Director-in-Charge:
Dr. Akbar Cheraqi
Editor-in-Chief:
Dr. Farhad Javidrad
Associate Editor:
Dr. Vahid Khalafi
Website Manager:
Amir Ehsan Zamanian
Eng. Nima Mansour Lakouraj
English Text Editor:
Dr. Roohollah Maleki
17359449
20
v.
1
no.
2018
62
76
https://www.joae.ir/article_121874_82ecd6cfe640d546372dccab6da60ac5.pdf