object(Publication)#769 (6) { ["_data"]=> array(28) { ["id"]=> int(6769) ["accessStatus"]=> int(0) ["datePublished"]=> string(10) "2024-09-24" ["lastModified"]=> string(19) "2024-09-26 10:40:32" ["primaryContactId"]=> int(8363) ["sectionId"]=> int(2) ["seq"]=> int(1) ["submissionId"]=> int(6645) ["status"]=> int(3) ["version"]=> int(1) ["categoryIds"]=> array(0) { } ["citationsRaw"]=> string(684) "[1] Gausz T., Légcsavarok, elektronikus jegyzet. 2015. Online: http://www.vrht.bme.hu/letoltes/Tanszeki_letoltheto_anyagok/Oktatok_anyagai/Dr.Gati_Balazs_anyagai/dr.Gausz_Tamas_jegyzetek/LEGCSAVAROK.pdf [2] E. Hartman, D. Biermann, The Aerodynamic Characteristics of Full-Scale Propellers Having 2, 3, and 4 Blades of Clark Y and R.A.F. 6 Airfoil Sections. NACA, 1938. Online: https://ntrs.nasa.gov/api/citations/19930091715/downloads/19930091715.pdf [3] Rohács J., Gausz Zs., Gausz T., Repülésmechanika, elektronikus jegyzet. 2012. Online: https://www.vrht.bme.hu/letoltes/Tanszeki_letoltheto_anyagok/Oktatok_anyagai/Jankovics_Istvan_anyagai/Repulesmechanika/Repulesmechanika.pdf" ["copyrightYear"]=> int(2024) ["issueId"]=> int(602) ["licenseUrl"]=> string(49) "https://creativecommons.org/licenses/by-nc-nd/4.0" ["pages"]=> string(4) "5-19" ["pub-id::doi"]=> string(20) "10.32560/rk.2023.3.1" ["abstract"]=> array(2) { ["en_US"]=> string(763) "

In this article, within the framework of the project “ Development of multi-purpose fixed-wing drone based on innovative solutions and the creation of necessary competencies”, our task was to examine a propulsion system mounted on an unmanned fixed-wing aircraft. We started the research by evaluating the results of the wind tunnel measurement. From the measurement data, we determined the characteristic curves of the propulsion system installed on the aircraft. We estimated the aerodynamic characteristics of the aircraft using the XFLR5 program. The operating conditions of the propeller in horizontal flight were determined from the results. It was found that the propeller fit is adequate at stall speed, but less than optimal at cruising speed.

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Ebben a cikkben az Innovatív és újszerű megoldásokra épülő többcélú merevszárnyú drón és a fejlesztéséhez szükséges kompetenciák létrehozása projekt keretében a feladatunk egy pilóta nélküli merevszárnyú repülőgépre szerelt propulziós rendszer vizsgálata volt. A vizsgálatot a szélcsatornamérés eredményeinek kiértékelésével kezdtük. A mérési adatokból meghatároztuk a repülőgépre szerelt hajtásrendszer karakterisztikus görbéit. Megbecsültük a repülőgép aerodinamikai jellemzőit XFLR5 program segítségével. Az eredményekből meghatároztuk a légcsavar üzemállapotait vízszintes repülésben. Megállapítottuk, hogy a légcsavar illesztése átesési sebességen megfelelő, utazó sebességen azonban elmarad az optimálistól.

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In recent times, more and more development activities have been taking place in our country, mainly on own resources. Some promising designs, such as the HC02.2 helicopter, are slowly reaching the milestone of type certification. This article deals with the design considerations for the related strength tests through a particular example.

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főiskolai docens

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object(Publication)#163 (6) { ["_data"]=> array(28) { ["id"]=> int(6903) ["accessStatus"]=> int(0) ["datePublished"]=> string(10) "2024-09-24" ["lastModified"]=> string(19) "2024-09-24 13:27:17" ["primaryContactId"]=> int(8536) ["sectionId"]=> int(2) ["seq"]=> int(3) ["submissionId"]=> int(6779) ["status"]=> int(3) ["version"]=> int(1) ["categoryIds"]=> array(0) { } ["citationsRaw"]=> string(2963) "[1] Csóré A., Major G., „A pilóta nélküli légi járművek (UAV) evolúciója,” Repüléstudományi Közlemények, 33. évf. 1. sz. pp. 171–191. 2021. Online: https://doi.org/10.32560/rk.2021.1.13 [2] Palik M., Pilóta nélküli repülés profiknak és amatőröknek. Budapest, Nemzeti Közszolgálati Egyetem, 2013. [3] Török Á., „A pilóta nélküli légijárművek légtérbe integrálása,” Repüléstudományi Közlemények, 29. évf. 3. sz. pp. 179–188. 2017. [4] Gál A., Szomora Zs., „A drónnal történő megfigyelés kriminalizálása, mint a büntetőjogi magánszféravédelem kiterjesztése,” FORVM Acta Juridica et Politica, 11. évf. 3. sz. pp.101–108. 2021. [5] Sándor Zs., Pusztai M., „A hazai pilóta nélküli légijármű-rendszerekre vonatkozó szabályozás EU-s jogszabályoktól való eltéréseinek bemutatása,” Repüléstudományi Közlemények, 33. évf. 1. sz. pp. 27–37. 2021. Online: https://doi.org/10.32560/rk.2021.1.3 [6] A Büntető Törvénykönyvről szóló 2012. évi C. törvény. Online: https://net.jogtar.hu/jogszabaly?docid=a1200100.tv [7] Görgényi I. et al., Magyar Büntetőjog. Különös Rész. Budapest, Wolters Kluwer Hungary Kft., 2020. [8] Karsai K., Nagykommentár a Büntető Törvénykönyvről szóló 2012. évi C. tör-vényhez. Budapest, Wolters Kluwer Hungary Kft., 2020. [9] az Európai Parlament és a Tanács 2016. április 27-i (EU) 2016/679 rendelete a természetes személyeknek a személyes adatok kezelése tekintetében történő védelméről és az ilyen adatok szabad áramlásáról, valamint a 95/46/EK irányelv hatályon kívül helyezéséről. Online: https://net.jogtar.hu/jogszabaly?docid=a1600679.eup [10] Az információs önrendelkezési jogról és az információszabadságról szóló 2011. évi CXII. törvény 3. § 10. pontja. Online: https://net.jogtar.hu/jogszabaly?docid=a1100112.tv [11] Blaskó B. et al., Büntetőjog. Különös Rész I. Budapest–Debrecen, Rejtjel, 2021. [12] Péterfalvi A., Eszteri D., „A személyes adatok büntetőjogi védelme Magyar-országon és a Nemzeti Adatvédelmi és Információszabadság Hatóság kapcsolódó gyakorlata,” in A személyiség és védelme: Az Alaptörvény VI. cikkelyének érvényesülése a magyar jogrendszeren belül. Görög M., Menyhárd A., Koltay A. szerk. Budapest, Eötvös Loránd Tudományegyetem Állam- és Jogtudományi Kar, 2017, pp. 405–420. [13] Belovics E., Molnár G. M., Sinku P., Büntetőjog II. Különös Rész. Budapest, HVG-ORAC, 2021. [14] Deres P., Harangozó A., Büntetőjog II. Különös rész. Budapest, Patrocinium, 2016. [15] Nagy Z., Tóth M., Magyar büntetőjog. Különös rész. Budapest, Osiris, 2014. [16] Nagy Z. A., „A jövő tegnap óta tart: A modern technikai-technológiai folyamatok kihívásai a jog területén,” Belügyi Szemle, 66. évf. 10. sz. pp. 36–55. 2018. Online: https://doi.org/10.38146/BSZ.2018.10.3" ["copyrightYear"]=> int(2024) ["issueId"]=> int(602) ["licenseUrl"]=> string(49) "https://creativecommons.org/licenses/by-nc-nd/4.0" ["pages"]=> string(5) "43-49" ["pub-id::doi"]=> string(20) "10.32560/rk.2023.3.3" ["abstract"]=> array(2) { ["en_US"]=> string(712) "

In recent years, the popularity of unmanned aircraft has increased significantly due to the fact that their possibilities of use are extremely wide. In connection with the criminal liability for the lawful use of drones, two criminal offences come into account. If open surveillance or recording takes place, civil sanctions for violation of personality rights may be applied, and if this unauthorised data processing causing significant harm to interests as a result, an offence of misuse of personal data pursuant to Section 219 (1) of the Criminal Code may be established. Secret surveillance is subject to the comprehensive facts of illegal data acquisition (Section 422 (1) (b) of the Criminal Code).

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Az utóbbi években a pilóta nélküli légi járművek népszerűsége jelentősen megnövekedett annak köszönhetően, hogy felhasználási lehetőségei rendkívül szélesek. A pilóta nélküli légi járművek jogszerű használatának büntetőjogi felelőssége kapcsán két bűncselekmény jön számításba.
Amennyiben nyílt megfigyelés vagy felvételrögzítés történik, akkor a személyiségi jogok sérelmének polgári jogi szankciói alkalmazhatók, ha pedig e jogosulatlan adatkezelés – eredményként – jelentős érdeksérelmet okoz, akkor a Btk. 219. § (1) bekezdése szerinti személyes adattal visszaélés vétsége állapítható meg. A titkos megfigyelésre pedig a tiltott adatszerzés átfogó tényállása alkalmazandó [Btk. 422. § (1) bekezdés b) pont].

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object(Publication)#158 (6) { ["_data"]=> array(28) { ["id"]=> int(7095) ["accessStatus"]=> int(0) ["datePublished"]=> string(10) "2024-09-24" ["lastModified"]=> string(19) "2024-09-24 13:27:17" ["primaryContactId"]=> int(8800) ["sectionId"]=> int(2) ["seq"]=> int(4) ["submissionId"]=> int(6971) ["status"]=> int(3) ["version"]=> int(1) ["categoryIds"]=> array(0) { } ["citationsRaw"]=> string(5308) "[1] T. Amukele, „Using Drones to Deliver Blood Products in Rwanda,” The Lancet Global Health, pp. e463–e464, 2022. Online: https://doi.org/10.1016/S2214-109X(22)00095-X [2] A. N. Albert et al., „Intricacies of Medical Drones in Healthcare Delivery: Implications for Africa,” Technology in Society, 51. szám, 66, p. 101624, 2021. Online: https://doi.org/10.1016/j.techsoc.2021.101624 [3] „The Verge,” [Online]. Elérhető: https://www.theverge.com/sponsored/goldman-sachs-drones. [4] „Statista,” [Online]. Elérhető: https://shorturl.at/f0TuN [5] H. Xiaojian et al., „A UAV Dynamic Path Planning Algorithm,” in 2020 35th Youth Academic Annual Conference of Chinese Association of Automation (YAC), 2020, pp. 127–131. [6] J. F. Shortle et al., „Simulating Collision Probabilities of Landing Airplanes at Nontowered Airports,” Simulation, pp. 21–31. 2004. Online: https://doi.org/10.1177/0037549704042028 [7] B. M. Sathyaraj et al., „Multiple UAVs Path Planning Algorithms: A Comparative Study,” Fuzzy Optimization and Decision Making, pp. 257–267. 2008. Online: https://doi.org/10.1007/s10700-008-9035-0 [8] S. Aggarwal, N. Kumar, „Path Planning Techniques for Unmanned Aerial Vehicles: A Review, Solutions, and Challenges,” Computer Communications, pp. 270–299. 2020. Online: https://doi.org/10.1016/j.comcom.2019.10.014 [9] R. Szabolcsi, „3D Flight Path Planning For Multirotor UAV,” Review of the Air Force Academy, pp. 5–16, 2020. Online: https://doi.org/10.19062/1842-9238.2020.18.1.1 [10] R. Szabolcsi, „Multirotoros pilóta nélküli légijárművek háromdimenziós repülési pályáinak számítógépes tervezése és szimulációja,” Hadtudomány, pp. 133–150. 2020. Online: https://doi.org/10.17047/HADTUD.2020.30.4.133 [11] R. Szabolcsi, „Flight Path Planning for Small UAV Low Altitude Flights,” Repüléstudományi Közlemények, pp. 159–167. 2020. Online: https://doi.org/10.2478/raft-2020-0019 [12] R. Szabolcsi, „Pilóta nélküli légi jármű kis magasságú repülési pályáinak tervezése,” Repüléstudományi Közlemények, 2020. Online: https://doi.org/10.32560/rk.2020.1.2 [13] C. Goerzen, Z. Kong, B. Mettler, „A Survey of Motion Planning Algorithms from the Perspective of Autonomous UAV Guidance,” Journal of Intelligent and Robotic Systems, pp. 65–100. 2020. Online: https://doi.org/10.1007/s10846-009-9383-1 [14] H. Liu et al., „An Autonomous Path Planning Method for Unmanned Aerial Vehicle Based on a Tangent Intersection and Target Guidance Strategy,” IEEE Transactions on Intelligent Transportation Systems, pp. 3061–3073. 2022. Online: https://doi.org/10.1109/TITS.2020.3030444 [15] Bortoff, Scott, „Path Planning for UAVs,” American Control Conference, 2000. Proceedings of the 2000, pp. 364–368. 2000. Online: https://doi.org/10.1109/ACC.2000.878915 [16] Balampanis et al., 2017 International Conference on Unmanned Aircraft Systems (ICUAS), 2017. [17] M. Rhinehart, Monte Carlo Testing of 2- and 3-dimensional Route Planners for Autonomous UAV Navigation in Urban Environments, Thesis (M.S.) University of Minnesota, 2008. [18] [Online]. Elérhető: https://cs.stanford.edu/people/eroberts/courses/soco/projects/1998-99/robotics/basicmotion.html. [19] Blasi et al., „Path Planning and Real-Time Collision Avoidance Based on the Essential Visibility Graph,” Applied Sciences, p. 5613. 2020. Online: https://doi.org/10.3390/app10165613 [20] C. Xia, C. Xiangmin, „The UAV Dynamic Path Planning Algorithm Research Based on Voronoi Diagram,” The 26th Chinese Control and Decision Conference (2014 CCDC), pp. 1069–1071. 2014. [21] I. W. Geoffrey, C. Sammut, Encyclopedia of Machine Learning. Boston, MA: Springer US, 2010. Online: https://doi.org/10.1007/978-0-387-30164-8 [22] V. Jeauneau, A. Kotenkoff, L. Jouanneau, „Path Planner Methods for UAVs in Real Environment,” FAC-PapersOnLine, pp. 292–297. 2018. Online: https://doi.org/10.1016/j.ifacol.2018.11.557 [23] F. Daniel et al., „A Systematic Literature Review of A* Pathfinding,” Procedia Computer Science, pp. 507–514. 2021. Online: https://doi.org/10.1016/j.procs.2021.01.034 [24] J. Borenstein, Y. Koren, „Potential Field Methods and Their Inherent Limitations for Mobile Robot Navigation,” Proceedings – IEEE International Conference on Robotics and Automation, pp. 1398–1404. 1991. [25] [Online]. Elérhető: http://www-personal.umich.edu/~johannb/vff&vfh.htm. [26] J. Borenstein, Y. Koren, „The Vector Field Histogram-Fast Obstacle Avoidance for Mobile Robots,” IEEE Transactions on Robotics and Automation, pp. 278–288. 1991. Online: https://doi.org/10.1109/70.88137 [27] T. Ahmad et al., „Drone Deep Reinforcement Learning: A Review,” Electronics, 2021. Online: https://doi.org/10.3390/electronics10090999 [28] H. Xiaojian et al., „A UAV Dynamic Path Planning Algorithm,” in 2020 35th Youth Academic Annual Conference of Chinese Association of Automation (YAC), 2020, pp. 127–131. Online: https://doi.org/10.1109/YAC51587.2020.9337581 [29] Cetin et al., „Drone Navigation and Avoidance of Obstacles Through Deep Reinforcement Learning,” in 2019 IEEE/AIAA 38th Digital Avionics Systems Conference (DASC), 2019, pp. 1–7. Online: https://doi.org/10.1109/DASC43569.2019.9081749" ["copyrightYear"]=> int(2024) ["issueId"]=> int(602) ["licenseUrl"]=> string(49) "https://creativecommons.org/licenses/by-nc-nd/4.0" ["pages"]=> string(5) "51-68" ["pub-id::doi"]=> string(20) "10.32560/rk.2023.3.4" ["abstract"]=> array(2) { ["en_US"]=> string(370) "

During my research I analysed the problems and the challenges of the UAV path planning. I am going to demonstrate the most common problems, which can come across during path planning. These problems include the Point Vehicle problem or the Jogger’s Problem. I am going to present the state-of-art path planning algorithms and solutions like Visible Graph or A*.

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Kutatásom során az UAV-pályatervezés nehézségeit és kihívásait vizsgáltam. Bemutatom az esetlegesen felmerülő legismertebb problémákat. Ilyen lehet a „pontszerű test”-probléma (Point Vehicle) vagy a „kocogó”-probléma (Jogger’s Problem). Bemutatom a legismertebb és jelen tudásunk szerint leghatásosabb, State-of-Art1 megoldásokat is, mint a Visible Graph vagy az A* alapú algoritmusok.

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object(Publication)#83 (6) { ["_data"]=> array(28) { ["id"]=> int(7133) ["accessStatus"]=> int(0) ["datePublished"]=> string(10) "2024-09-24" ["lastModified"]=> string(19) "2024-09-24 13:27:17" ["primaryContactId"]=> int(8869) ["sectionId"]=> int(2) ["seq"]=> int(5) ["submissionId"]=> int(7009) ["status"]=> int(3) ["version"]=> int(1) ["categoryIds"]=> array(0) { } ["citationsRaw"]=> string(1652) "[1] „Commission Implementing Regulation (EU) 2019/947 of 24 May 2019 on the Rules and Procedures for the Operation of Unmanned Aircraft,” Official Journal of the European Union L 152, 62. évf. 2019. június 11. Online: http://data.europa.eu/eli/reg_impl/2019/947/oj [2] FAA regulation: Code of Federal Regulations. Title 14 – Aeronautics and Space, Subchapter F – Air Traffic and General Operating Rules, Part 107 – Small Unmanned Aircraft Systems, § 107.31 Visual Line of Sight Aircraft Operation. [3] European Union Aviation Safety Agency, Acceptable Means of Compliance (AMC) and Guidance Material (GM) to Commission Implementing Regulation (EU) 2019/947. 2022. szeptember. Online: https://www.easa.europa.eu/downloads/110913/en [4] Luftfahrt-Bundesamt (LBA) útmutató: Guidance for Dimensioning of Flight Geography, Contingency Volume and Ground Risk Buffer. 2023. február 15. Verzió 1.5. Online: https://www.lba.de/SharedDocs/Downloads/DE/B/B5_UAS/Leitfaden_FG_CV_GRB_eng.pdf?__blob=publicationFile&v=8 [5] 44/2005. (V. 6.) FVM-GKM-KvVM együttes rendelet a mező- és erdőgazdasági légi munkavégzésről. Online: https://net.jogtar.hu/jogszabaly?docid=a0500044.fvm [6] „Commission Delegated Regulation (EU) 2019/945 of 12 March 2019 on Unmanned Aircraft Systems and on Third-country Operators of Unmanned Aircraft Systems,” Official Journal of the European Union L 152, 62. évf. 2019. június 11. Online: http://data.europa.eu/eli/reg_del/2019/945/oj [7] E. Alvarado, „BVLOS Operations: Expanding the Frontier,” Drone Industry Insight, 2021. 11. 25. Online: https://droneii.com/bvlos-operations-expanding-the-frontier " ["copyrightYear"]=> int(2024) ["issueId"]=> int(602) ["licenseUrl"]=> string(49) "https://creativecommons.org/licenses/by-nc-nd/4.0" ["pages"]=> string(5) "69-78" ["pub-id::doi"]=> string(20) "10.32560/rk.2023.3.5" ["abstract"]=> array(2) { ["en_US"]=> string(593) "

The question often arises: What is the maximum distance of the UAV from the remote pilot during a VLOS operation? The answer is complex, and no specific numerical value is assigned, as it can be determined by considering a combination of factors. Unfortunately, the oft-mentioned rule of thumb of 1 km cannot be applied in all cases. In some cases, 1 km is the absolute maximum. However, it should be taken into account that the operation can become a BVLOS operation even a few times at a distance of 100 m, even if landmarks or other factors do not obstruct the visibility of the UAV.

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Sokszor felmerül a kérdés, hogy a látótávolságon belüli üzemben (VLOS) végrehajtott művelet során mekkora lehet az UAV maximális eltávolodása a távpilótától. A válasz összetett, és nincs konkrét számérték hozzárendelve, ugyanis több tényező együttes figyelembevételével lehet ezt megállapítani. A sokszor említett 1 km-esökölszabály sajnos nem alkalmazható teljeskörűen, minden esetre. Bizonyos esetekben az 1 km jelenti az abszolút maximumot, de figyelembe kell venni, hogy akár már néhány 100 m-eseltávolodás esetén is kikerülhet a művelet a VLOS-ból, még akkor is, ha az UAV-ravaló rálátást tereptárgyak vagy egyéb tényezők nem akadályozzák.

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The functional integrity of brain perfusion and oxygen transport profoundly determines mental performance during military flight missions and spaceflight. Presently, at the selection phase of pilot candidates, there are no screening methods to evaluate cerebral circulation and its autonomous regulation (AR), meanwhile the pilot information processing capacity could be insufficient in dangerous flight situations with high mental workload or during high “head-to-foot” G loads. On-board ISS (International Space Station) and during deep-space missions circulatory changes can be evolved in the opposite direction due to the microgravity: blood shift toward the head-neck region can increase ICP (Intracranial Pressure) and tenfold increase of carbon-dioxide concentration can provoke complaints and disturbances in eye and brain blood circulation (Space Associated Neuro-Ocular Syndrome – SANS). The alteration of brain perfusion dynamics and oxygen utilisation was investigated on the head-down tilting table (HDT) test and in the hypobaric (low-pressure) chamber. We registered the brain regional pulse wave changes by the bioimpedance (Rheoencephalography – REG) on 19 volunteers in rest and after the breath-holding manoeuvre. We found that during the head-down tilt (HDT) position, the amplitude of the second peak of the REG pulse wave increased, like the ICP pulse wave, being an unfavourable sign for intracranial pressure increase in clinical cases. Manual readings resulted in significant differences during HDT between the female (P = 0.0007) and male (P < 0.0001) groups. With automated analysis, the increase in REG P2 wave was significant, and the ratio was 4/5 (80%) for women and 10/14 (71%) for men. The newly written automatic program script was able to detect this in 92% of the cases. The calculated values detected the state of cerebral circulatory autoregulation and the identity between the male and female groups. Based on this result and previous REG correlation studies, it can be concluded that REG could be used to monitor fighter pilots, astronauts, and neurocritical care patients in real-time as emergency alert in the transitory cessation of brain perfusion.

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object(Publication)#828 (6) { ["_data"]=> array(28) { ["id"]=> int(7374) ["accessStatus"]=> int(0) ["datePublished"]=> string(10) "2024-09-24" ["lastModified"]=> string(19) "2024-09-24 13:27:16" ["primaryContactId"]=> int(9215) ["sectionId"]=> int(2) ["seq"]=> int(7) ["submissionId"]=> int(7250) ["status"]=> int(3) ["version"]=> int(1) ["categoryIds"]=> array(0) { } ["citationsRaw"]=> string(5579) "[1] S. Yan et al., ‘Surge Margin Monitoring of One Turboshaft Engine with Inlet Distortion’. Journal of Physics Conference Series, Vol. 2472, pp. 1742–6588, 2022. Online: https://doi.org/10.1088/1742-6596/2472/1/012053 [2] B. Zhao et al., ‘Experimental Investigations on Effects of the Self-Circulation Casing Treatment on Acoustic and Surge Characteristics in a Centrifugal Compressor’. Aerospace Science and Technology, Vol. 131, Part A. 2022. Online: https://doi.org/10.1016/j.ast.2022.108002 [3] H. Zhang et al., ‘Numerical Study of the Coherent Characteristics of the Blade Tip of a Micro Centrifugal Compressor and Its Application in a New Unsteady Casing-Treatment Experiment’. Physics of Fluids, Vol. 36, no. 1, 017139. 2024. Online: https://doi.org/10.1063/5.0190152 [4] T. Haeckel et al., ‘Determination of a Numerical Surge Limit by Means of an Enhanced Greitzer Compressor Model’. International Journal of Turbomachinery Propulsion and Power, Vol. 8, no. 4, p. 2023. Online: https://doi.org/10.3390/ijtpp8040048 [5] Q. Peng et al., Centrifugal Compressor Performance Prediction and Dynamic Simulation of Natural Gas Hydrogen Blended’. International Journal of Hydrogen Energy, Vol. 52, Part B, pp. 872–893, 2024. Online: https://doi.org/10.1016/j.ijhydene.2023.10.023 [6] I. Shahin et al., ‘Large Eddy Simulation of Surge Inception and Active Surge Control in a High Speed Centrifugal Compressor with a Vaned Diffuser’. Applied Mathematical Modelling, Vol. 40, no. 23–24, pp. 10404–10418, 2016. Online: https://doi.org/10.1016/j.apm.2016.07.030 [7] X. Zheng et al., ‘Experimental Investigation of Surge and Stall in a Turbocharger Centrifugal Compressor with a Vaned Diffuser’. Experimental Thermal and Fluid Science, Vol. 82, pp. 493–506, 2017. Online: https://doi.org/10.1016/j.expthermflusci.2016.11.036 [8] T. Alsuwian et al., ‘A Review of Anti-Surge Control Systems of Compressors and Advanced Fault-Tolerant Control Techniques for Integration Perspective’. Heliyon, Vol. 9, e19557, 2023. Online: https://doi.org/10.1016/j.heliyon.2023.e19557 [9] A. Renz et al., ‘Improving a Centrifugal Compressor's Performance at Low Mass Flow Rates by Adding an Acoustic Resonator’. Journal of Engineering for Gas Turbines and Power, Vol. 145, no. 12, 2023. Online: https://doi.org/10.1115/1.4063583 [10] C. Jia et al., ‘Low-Frequency Fluctuation Propagation of Rotating Stall in the Centrifugal Compressor and Pipe System’. 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Li et al., ‘Surge Process of a High-Speed Axial-Centrifugal Compressor’. Processes, Vol. 11, no. 10, 2869, 2023. Online: https://doi.org/10.3390/pr11102869 [15] M. Zhang et al., ‘Numerical Model of Predicting Surge Boundaries in High-Speed Centrifugal Compressors’. Aerospace Science and Technology, Vol. 141, 108518, 2023. Online: https://doi.org/10.1016/j.ast.2023.108518 [16] Y. Hayashi, T. Cao, ‘An Investigation of Non-Linear Surge Characteristic in a High-Speed Centrifugal Compressor’. Journal of Turbomachinery, Vol. 145, no. 5, 2023. Online: https://doi.org/10.1115/1.4056089 [17] P. Silvestri et al., ‘Compressor Surge Precursors for a Turbocharger Coupled to a Pressure Vessel’. Journal of Engineering for Gas Turbines and Power, Vol. 144, no. 11, 111014, 2022. Online: https://doi.org/10.1115/1.4055479 [18] H. Chen et al., ‘Real-Time Instability Detection of Centrifugal Compressors Based on Motor Speed Measurements’. Journal of Thermal Science, Vol. 32, pp. 310–329, 2023. Online: https://doi.org/10.1007/s11630-022-1685-7 [19] K. Beneda, Development of Active Surge Control Devices for Centrifugal Compressors. PhD Thesis, 2013. [20] H. Tamaki, ‘Effect of Recirculation Device with Counter Swirl Vane on Performance of High Pressure Ratio Centrifugal Compressor’. Journal of Turbomachinery, Vol. 134, no. 5, 051036, 2012. Online: https://doi.org/10.1115/1.4004820 [21] S. Y. Yoon et al., ‘Model Validation for an Active Magnetic Bearing Based Compressor Surge Control Test Rig’. Journal of Vibration and Acoustics, Vol. 132, no. 6, 061005, 2010. Online: https://doi.org/10.1115/1.4001845 [22] K. Beneda, Preliminary Results of Active Centrifugal Compressor Surge Control Using Variable Inducer Shroud Bleed’. Periodica Polytechnica Transportation Engineering, Vol. 39, no. 2, pp. 49–54, 2011. Online: https://doi.org/10.3311/pp.tr.2011-2.01 [23] Zs. Faltin, K. Beneda, ‘Stress Assessment of Centrifugal Compressor with Surge Suppression Holes in the Impeller Hub’. in 2019 New Trends in Aviation Development (NTAD), pp. 40–44, 2019. Online: https://doi.org/10.1109/NTAD.2019.8875526" ["copyrightYear"]=> int(2024) ["issueId"]=> int(602) ["licenseUrl"]=> string(49) "https://creativecommons.org/licenses/by-nc-nd/4.0" ["pages"]=> string(7) "103-116" ["pub-id::doi"]=> string(20) "10.32560/rk.2023.3.7" ["abstract"]=> array(1) { ["en_US"]=> string(1237) "

Centrifugal compressors are widely used throughout various industrial applications, including many safety-critical fields like aircraft engines. Thus, the enhancement of stable operational range is essential, which often requires active surge control methods. This includes state-of-the-art digital electronic measurement system to detect the onset of surge, which is a phenomenon that arises under extreme operational conditions and can lead to either negatively influenced behaviour or even the destruction of the compressor hardware in the case of uncontrolled conditions. Therefore, a strong emphasis must be given to observe impending surge and, if possible, to include an active system that can prevent undesired operational situations. Amongst many passive and active possibilities of surge control, Blade Load Distribution Control (BLDC) can be considered as a method, which creates acceptable influence on instabilities with a minor efficiency loss, consequently, could be applied as an active surge suppression system. The aim of this paper is to investigate feasible solutions on an existing centrifugal compressor test bench, which would enable to examine the theoretical solutions for blade load distribution control.

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The triumphal march of helicopters can be traced back to the beginning of the 20^th century. Although the technology – in both the literal and figurative sense of the world – was just spreading its wings at the time, the versatility and countless possibilities of use and application foretold the future success of the new aircraft. As time progressed, more modern types appeared one after the other, which became more and more efficient, stronger, faster and, most importantly, more and more safe.

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A helikopterek diadalmenetének kezdete a 20. század elejére tehető. Bár a technológia – a szó szoros és átvitt értelmében is – akkoriban még csupán a szárnyait bontogatta, a sokoldalúság és a számtalan felhasználási, alkalmazási lehetőség előrevetítette az új repülőeszköz majdani sikerét. A kor előrehaladtával sorra jelentek meg a korszerűbb típusok, amelyek egyre hatékonyabbak, erősebbek, gyorsabbak, és ami a fő, egyre biztonságosabbak lettek.

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helikopter oktató

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Online: https://net.jogtar.hu/jogszabaly?docid=96700041.tvr [3] 1971. évi 25. törvényerejű rendelet a nemzetközi polgári repülésről Chicagóban, az 1944. évi december hó 7. napján aláírt Egyezmény és az annak módosításáról szóló jegyzőkönyvek kihirdetéséről, 1. és 2. cikk. Online: https://net.jogtar.hu/jogszabaly?docid=97100025.tvr [4] 1995. évi XCVII. törvény a légiközlekedésről. Online: https://net.jogtar.hu/jogszabaly?docid=99500097.tv [5] 26/2007. (III. 1.) GKM-HM-KvVM együttes rendelet a magyar légtér légiközlekedés céljára történő kijelöléséről 24. §. 11., 12., 12a., 27., 29. pontjai. Online: https://net.jogtar.hu/jogszabaly?docid=a0700026.gkm [6] 3/2006. (II. 2.) HM rendelet az állami repülések céljára kijelölt légterekben végrehajtott repülések szabályairól. Online: https://net.jogtar.hu/jogszabaly?docid=a0600003.hm [7] 38/2021. (II. 2.) Korm. rendelet a pilóta nélküli állami légi járművek repüléséről. Online: https://net.jogtar.hu/jogszabaly?docid=a2100038.kor [8] 382/2016. 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Online: https://novekedes.hu/interju/vege-az-ossze-vissza-dronozas-korszakanak [18] Angyal Z., Légi közlekedési jog az Európai Unióban. Budapest, HVG Orac, 2011. [19] Gyurkovics S., Közlekedéspolitika és közlekedésigazgatás jegyzet. Budapest, 2020. [20] Moys P., Nemzetközi Légijog. Budapest, 2006 [21] Gajdács L., Major G., „Katonai célú drónfejlesztések a jelenkorban a jövő vizionálva,” in Szemelvények a katonai műszaki tudományok eredményeiből III. 2022, pp. 101–120. Online: https://tudasportal.uni-nke.hu/xmlui/static/pdfjs/web/viewer.html?file=https://tudasportal.uni-nke.hu/xmlui/bitstream/handle/20.500.12944/18399/Szemelvenyek_a_katonai_muszaki_tudomanyok_eredmenyeibol_III.pdf?sequence=1&isAllowed=y [22] Halászné dr. Tóth A., „A pilóta nélküli légi járművek repülésének jogi szabályozása,” in Pilóta nélküli repülés profiknak és amatőröknek. Palik M. szerk. Budapest, Nemzeti Közszolgálati Egyetem, 2013. pp. 187–188. [23] ICAO Circular 328. International Civil Aviation Organization, 2011. pp. 1–38. Online: https://www.icao.int/meetings/uas/documents/circular%20328_en.pdf [24] International Civil Aviation Organization, About ICAO. Online: https://www.icao.int/about-icao/Pages/default.aspx [25] Közlekedési Hatóság, Légügyi szakterület. Online: https://www.kozlekedesihatosag.kormany.hu/hu/web/legugyi-szakterulet [26] L. Pierallini, F. Grassetti, F. P. Ballirano, Drone Regulation 2020. London, Studion Pierallini, 2019. november. [27] Légtér.hu, Drón törvény 2021-érthetően szakértőktől. Online: https://legter.hu/blog/dron-torveny-2021-erthetoen-szakertoktol [28] Major G., „A pilóta nélküli légijármű rendszerek (UAS) nemzetbiztonsági célú felhasználásának lehetőségei, technikai korlátai és alkalmazásának etikai kérdései,” doktori (PhD-) értekezés, Budapest, Magyarország: Nemzeti Közszolgálati Egyetem, 2023. [29] Major G., Ujjady A. „A civil drónszabályozáson innen, a katonain túl,” Repüléstudományi Közlemények, 33. évf. 2. sz. pp. 167–180. 2021. Online: https://doi.org/10.32560/rk.2021.2.12 [30] Major G., „Ésszerű szabályozás vagy tiltás, avagy mit lehet kezdeni a drónokkal?,” in Repüléstudományi Közlemények, 27. évf. 1. sz. pp. 167–176. 2015. Online: https://www.repulestudomany.hu/folyoirat/2015_1/2015-1-15-0218-Major_Gabor.pdf [31] MÚLT-KOR, Sokan eleinte a gonosz művének vélték a Montgolfier fivérek hőlégballon-kísérleteit. Online: https://mult-kor.hu/sokan-eleinte-a-gonosz-muvenek-veltek-a-montgolfier-fiverek-holegballon-kiserleteit-20200626 [32] P. Volk, A Peek into the Future; Large UAS in the National Airspace System. Online: https://www.flyhpa.com/2017/09/a-peek-into-the-future-large-uas-in-the-national-airspace-system/ [33] Rottler V., „A drónhasználat jogi szabályozásának nemzetközi trendjei és hazai helyzete,” Magyar Rendészet, 4. sz. pp. 151–171. 2018. Online: https://doi.org/10.32577/mr.2018.4.9 [34] Sipos A., „Szabályok három dimenzióban” in Nemzetközi légijog. Budapest, Wolters Kluwer, 2015. [35] Sipos A., A nemzetközi polgári repülés joga. Budapest, ELTE Eötvös, 2018. [36] Sipos A., „A polgári légi jármű jogi státusza,” Repüléstudományi Közlemények, 29. évf. 3. sz. p. 3. 2017. Online: https://www.repulestudomany.hu/folyoirat/2017_3/2017-3-21-0439_Sipos_Attila.pdf [37] Tarján M. T., „A Montgolfier-testvérek első nyilvános léggömbkísérlete,” RUBICONonline. Online: http://www.rubicon.hu/magyar/oldalak/1783_junius_4_a_montgolfier_testverek_elso_nyilvanos_leggombkiserlete/ 2021.05.11. [38] UK CAA, Introduction to Drone Flying and the UK Rules. Online: https://www.caa.co.uk/drones/rules-and-categories-of-drone-flying/introduction-to-drone-flying-and-the-uk-rules/" ["copyrightYear"]=> int(2024) ["issueId"]=> int(602) ["licenseUrl"]=> string(49) "https://creativecommons.org/licenses/by-nc-nd/4.0" ["pages"]=> string(7) "125-148" ["pub-id::doi"]=> string(20) "10.32560/rk.2023.3.9" ["abstract"]=> array(2) { ["en_US"]=> string(556) "

The development of unmanned aviation worldwide is on a massive scale. The number of reported flights now equals the number of flights by manned aircraft, and the trend is increasing. These flights should have some kind of time frame so that everyone can reach their destination safely. This requires a regulatory framework, both at international and domestic level, in which the aerospace industry can flourish as effectively as possible. In this publication, the author describes how this drone legislation has been envisioned in international law.

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A pilóta nélküli repülés fejlődése világszerte hatalmas léptékű. A bejelentett repülések száma mára vetekszik az ember által vezetett légi járművekkel történő repülések számával, és egyre inkább növekvő tendenciát mutat. Ezeknek a repüléseknek valamiféle keretet kell szabni, hogy mindenki épségben érhessen az úti céljához. Ehhez mind nemzetközi, mind pedig hazai szinten olyan jogszabályi kereteket kell felállítani, amelyben a lehető leghatékonyabban tud kiteljesedni a repülőipar. Ebben a publikációban a szerző bemutatja, hogy a dróntörvénykezést hogyan képzelték el a nemzetközi szabályozásban.

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object(Publication)#874 (6) { ["_data"]=> array(28) { ["id"]=> int(7235) ["accessStatus"]=> int(0) ["datePublished"]=> string(10) "2024-09-24" ["lastModified"]=> string(19) "2024-09-24 13:27:16" ["primaryContactId"]=> int(9037) ["sectionId"]=> int(2) ["seq"]=> int(10) ["submissionId"]=> int(7111) ["status"]=> int(3) ["version"]=> int(1) ["categoryIds"]=> array(0) { } ["citationsRaw"]=> string(6880) "[1] S. N. Mohanty et al. eds., Drone Technology: Future Trends and Practical Applications. Wiley, 2023. https://doi.org/10.1002/9781394168002 [2] E. Vinogradov, S. Pollin, Drone Technology: Interdisciplinary Systematic Assessment of Knowledge Gaps and Potential Solutions. 2021. Online: https://doi.org/10.48550/ARXIV.2110.07532 [3] M. Abdelkader, A. Koubâa, Unmanned Aerial Vehicles Application: Challenges and Trends. Cham, Springer, 2023. Online: https://doi.org/10.1007/978-3-031-32037-8 [4] U. E. Franke, The Unmanned Revolution: How Drones are Revolutionising Warfare. PhD Thesis, University of Oxford, 2018. [5] A. Kumar, ‘Drone Proliferation and Security Threats’. Journal of Asian Affairs, Vol. 33, no. 1–2, pp. 43–62, 2020. [6] C. Cioacă et al., ‘UAS Flexible Configuration for Optimum Performance in ISTAR Military Missions’. Studies in Informatics and Control, Vol. 31, no. 3, pp. 117–124, 2022. Online: https://doi.org/10.24846/v31i3y202211 [7] M.Palik, Pilóta nélküli repülés profiknak és amatőröknek. Budapest, Nemzeti Közszolgálati Egyetem, 2013. [8] R. Melnyk, A Framework for Analyzing Unmanned Aircraft System Integration into the National Airspace System Using a Target Level of Safety Approach. Doctoral Thesis, Georgia Institute of Technology, 2013. Online: https://doi.org/10.48550/ARXIV.2110.07532 [9] F. W. Ploeger, Strategic Concept of Employment for Unmanned Aircraft Systems in NATO. Joint Air Power Competence Centre, 2010. [10] Defence.hu, The Skylark Procurement Project Has Come to an End. Defence.hu, 2023. 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Center for Strategic and International Studies, 8 December 2020. Online: https://www.csis.org/analysis/air-and-missile-war-nagorno-karabakh-lessons-future-strike-and-defense [16] J. F. Antal, Seven Seconds to Die: A Military Analysis of the Second Nagorno-Karabakh War and the Future of Warfighting. Philadelphia, Oxford, Casemate, 2022. [17] I. Resperger, A válságkezelés a hibrid hadviselés. Budapest, Dialóg Campus, 2018. [18] „International armed conflict in Ukraine”. Rule of Law in Armed Conflicts, 2023. [19] M. Ilyushina et al., ‘Russia and Ukraine are Fighting the First Full-Scale Drone War’. The Washington Post, 2 December 2022. Online: https://www.washingtonpost.com/world/2022/12/02/drones-russia-ukraine-air-war/ [20] A. Taylor et al., ‘What Are Kamikaze Drones? Here’s How Russia and Ukraine Are Using Them’. The Washington Post, 17 October 2022. Online: https://www.washingtonpost.com/world/2022/10/17/kamizake-drones-russia-ukraine/ [21] Airforce Technology, Orlan-10 Uncrewed Aerial Vehicle (UAV). 24 March 2023. Online: https://www.airforce-technology.com/projects/orlan-10-unmanned-aerial-vehicle-uav/ [22] A. Chapple, The Drones of the Ukraine War. Radio Free Europe/Radio Liberty, 17 November 2022. Online: https://www.rferl.org/a/ukraine-russia-invasion-drones-war-types-list/32132833.html [23] D. Hambling, ‘How Ukraine Perfected The Small Anti-Tank Drone’, Forbes, 1 June 2022. Online: https://www.forbes.com/sites/davidhambling/2022/06/01/how-ukraine-perfected-the-small-anti-tank-drone/ [24] C. Lavallée, B. O. Martins, ‘Reframing Civil–Military Relations in the EU: Insights From the Drone Strategy 2.0’. Journal of Common Market Studies, Vol. 62, no. 2, pp. 619–625, 2024. Online: https://doi.org/10.1111/jcms.13546 [25] M. A. R. Estrada, A. Ndoma, ‘The Uses of Unmanned Aerial Vehicles –UAV’s- (or Drones) in Social Logistic: Natural Disasters Response and Humanitarian Relief Aid’. Procedia Computer Science, Vol. 149, pp. 375–383, 2019. Online: https://doi.org/10.1016/j.procs.2019.01.151 [26] B. Vízvári, ‘Repülési technológiára alapozott, nagyvárosi, kiterjedt katasztrófa utáni mentőszervezet: koncepció elvek’. Repüléstudományi Közlemények, Vol. 31, no. 2, pp. 177–192, 2019. Online: https://doi.org/10.32560/rk.2019.2.13 [27] C. McCarthy, ‘Can Drones Help Smallholder Farmers Improve Agriculture Efficiencies and Reduce Food Insecurity in Sub-Saharan Africa? Local Perceptions from Malawi’. Agriculture, Vol. 13, no. 5, 2023. Online: https://doi.org/10.3390/agriculture13051075 [28] Z. Bottyán et al., ‘Rutinszerű légköri vertikális profilmérések végrehajtására alkalmas drón mérőhálózat kialakítása’. Közlekedés Mobilitás, Vol 1, no. 1, pp. 55–65, 2022. Online: https://doi.org/10.55348/KM.16 [29] G. K. Kiss Leizer, ‘Possible Areas of Application of Drones in Waste Management during Rail Accidents and Disasters’. Interdisciplinary Descriptions of Complex Systems, Vol. 16, no. 3-A, pp. 360–368, 2018. Online: https://doi.org/10.7906/indecs.16.3.8 [30] https://elbitsystems.com/product/skylark-3/ [31] https://www.thedefensepost.com/2022/11/10/us-army-puma-drones-aerovironment/ [32] https://aviationsmilitaires.net/v3/kb/picture/7326/thales-wk450-watchkeeper-en-vol [33] https://www.navalnews.com/naval-news/2020/11/philippine-navy-takes-delivery-of-eight-scaneagle-uav/ [34] https://www.turbosquid.com/3d-models/aai-rq-7-shadow-uav-3ds/969532 [35] https://www.turbosquid.com/es/3d-models/combat-drone-tai-anka-s-rigged-model-1912206 [36] https://www.turbosquid.com/3d-models/3d-bayraktar-tb2-model-1510071 [37] https://aero-space.eu/2023/03/08/heron-family-of-uas-the-key-to-gaining-tactical-and-strategic-intelligence/ [38] https://fancy4sport.com/mq-1-predator-pioneering-unmanned-aerial-warfare-hoanhanghai-1696685184079/ [39] https://www.unmannedsystemstechnology.com/2018/07/mq-9-reaper-uas-selected-by-royal-netherlands-defence-force/ [40] https://www.turbosquid.com/es/3d-models/3d-model-iai-harop-uav-1878038 [41] https://www.turbosquid.com/3d-models/hesa-shahed-136-2046457 [42] https://free3d.com/3d-model/russian-uav-orlan-10e-5365.html [43] https://www.avinc.com/media_center/assets/loitering-munition-systems/switchblade [44] https://engineerine.com/ukraine-is-building-diy-drones/" ["copyrightYear"]=> int(2024) ["issueId"]=> int(602) ["licenseUrl"]=> string(49) "https://creativecommons.org/licenses/by-nc-nd/4.0" ["pages"]=> string(7) "149-170" ["pub-id::doi"]=> string(21) "10.32560/rk.2023.3.10" ["abstract"]=> array(1) { ["en_US"]=> string(571) "

This study aims to provide a comprehensive overview of unmanned aircraft systems (UAS) encompassing both civilian and military application in contemporary operations, emphasising their potential impact on future advancements. Through an in-depth analysis, we examine the current state-of-the-art UAS technologies, their applications, and evaluate their efficiency in various sectors. Furthermore, this research offers insights into the potential trajectories and challenges that may arise as drone technology continues to evolve and integrate into our daily lives.

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Assistant Lecturer

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tanársegéd

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The DJI Dock 2 “drone in a box” is an enhanced version of the previous Dock 1 solution, where a more sophisticated, agile, mobile, lightweight and efficient product has been introduced to improve and meet the needs of reliable, fully autonomous drone operations even at an extended range. The latest advances in technology will enable the organisation, planning and execution of fully automated flight operations with drones, even beyond visual range. There are many missions and tasks that were previously dangerous to perform with human resources because it was too risky or did not provide an efficient and satisfactory solution for the control, guarding, protection or continuous surveillance of sites important for the operation of public bodies, sectors of the national economy or for guaranteeing the safety of the population. Now these problems can be adequately addressed with the DJI Dock 2 and its accessories, as it can be used for drone-powered patrols and guarded tours around protected areas.

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