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    Propeller shrouding influence on lift force of mini unmanned quadcopter

    Penkov, I, Aleksandrov, D
    International Journal of Automotive and Mechanical Engineering, Sep 2017, Vol.14, pp.4486-4495 [Peer Reviewed Journal]
    © ProQuest LLC All rights reserved, Engineering Database, East & South Asia Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest Central China, ProQuest One Academic, Engineering Collection (ProQuest)
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    Title: Propeller shrouding influence on lift force of mini unmanned quadcopter
    Author: Penkov, I; Aleksandrov, D
    Subject: United States–Us ; International Conferences ; Air Flow ; Helicopters ; Fluid Dynamics ; Unmanned Aerial Vehicles ; Propeller Efficiency ; Unmanned Aerial Vehicles ; Design ; Hoisting ; Energy ; Systems Stability ; Computational Fluid Dynamics ; Aerospace Engineering ; Military Technology ; Research & Development–R&D
    Description: This article discusses the lift force generated by a mini unmanned aerial vehicle. Shrouded propellers were considered and analyses of shroud influence on lift force and energy saving were done. By help of laboratory experiments and computational fluid dynamics simulations (propeller velocity varied from 1000 rpm to 6000 rpm, shroud height from 20 mm to 60 mm, gap from 3 mm to 28 mm), it was shown that the shroud diameter influenced the rotor energy consumption up to 30% at velocities of more than 4000 rpm. With the increase shroud diameter (increase of distance between shroud and propeller borders), the lifting force increased. A gap of more than 30 mm practically did not influence the lifting force. Shroud height (from 20 mm to 60 mm, gap is 28 mm) also influenced the propeller efficiency (up to 10%) on small shroud heights (up to 30 mm). With the increase of the shroud height, the lift force decreased about 3% and then it increased up to 12%. From a value of about 50 millimetres, this...
    Is part of: International Journal of Automotive and Mechanical Engineering, Sep 2017, Vol.14, pp.4486-4495
    Identifier: 22298649 (ISSN); 21801606 (E-ISSN); 10.15282/iiame.14.3.2017.7.0354 (DOI)

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    Analysis and study of the influence of the geometrical parameters of mini unmanned quad-rotor helicopters to optimise energy saving

    Penkov, I, Aleksandrov, D
    International Journal of Automotive and Mechanical Engineering, Dec 2017, Vol.14, pp.4730-4746 [Peer Reviewed Journal]
    © ProQuest LLC All rights reserved, Engineering Database, East & South Asia Database, Publicly Available Content Database, ProQuest Engineering Collection, ProQuest Technology Collection, ProQuest SciTech Collection, Materials Science & Engineering Database, ProQuest Central (new), ProQuest Central Korea, SciTech Premium Collection, Technology Collection, ProQuest Central Essentials, ProQuest Central China, ProQuest One Academic, Engineering Collection (ProQuest)
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    Title: Analysis and study of the influence of the geometrical parameters of mini unmanned quad-rotor helicopters to optimise energy saving
    Author: Penkov, I; Aleksandrov, D
    Subject: International Conferences ; Kinematics ; Signal Processing ; Rotors ; Unmanned Aerial Vehicles ; Hoisting ; Energy ; Power Consumption ; Lift ; Computer Simulation ; Efficiency ; Mechanical Engineering ; Vehicles ; Robotics ; Simulation ; Propellers ; Materials Science ; Helicopters ; Unmanned Aerial Vehicles ; Studies
    Description: The article discusses lift force generated by mini UAVs (Unmanned Aerial Vehicles). CFD (Computational Fluid Dynamics) simulations were made on the base of a 3D scanned propeller model. Influence of some geometrical parameters of propeller (like velocity or pitch) and quadcopter (like gap) on lifting force was considered. Different propeller pitches were used and pitch influence on propeller lift force was analysed. Normally, lifting force will increase with the increasing of propeller pitch but for different rotation velocities, this increasing is different and in all cases, it can be approximated by a linear relationship. To obtain dependency functions, an equation for calculation of lift force given took into account the correction coefficients. This equation gave reliable results at pitch values equal to 0.3 - 0.7 of the propeller diameter and at rotation velocities of 2000 min-1 - 8000 min-1. Lift force dependency from distance between rotors was also considered. Simulations and experiments...
    Is part of: International Journal of Automotive and Mechanical Engineering, Dec 2017, Vol.14, pp.4730-4746
    Identifier: 22298649 (ISSN); 21801606 (E-ISSN); 10.15282/ijame.14.4.2017.11.0372 (DOI)

    • Several versions

    Anisotropic Flow of Charged Particles in Pb-Pb Collisions at √sNN=5.02TeV

    Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Alam, S. N., Albuquerque, D. S. D., Aleksandrov, D., Alessandro, B.
    Physical Review Letters, 2016, Vol.116(13), pp.urn:issn:0031-9007 [Peer Reviewed Journal]

    • Several versions

    Higher harmonic anisotropic flow measurements of charged particles in Pb-Pb collisions at root s(NN)=2.76 TeV

    Aamodt, Kenneth, Abelev, B, Quintana, AA, Adamova, D, Adare, Am, Aggarwal, MM, Rinella, Ga, Agocs, AG, Agostinelli, A, Salazar, SA, Ahammed, Z, Ahmad, N, Masoodi, AA, Ahn, Su, Akindinov, A, Aleksandrov, D, Alessandro, B, Molina, Ra, Alici, A, Alkin, A
    Physical review letters, 2011 [Peer Reviewed Journal]

    • Several versions

    Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at root s(NN)=2.76 TeV

    Aamodt, K., Quintana, A. Abrahantes, Adamova, D., Adare, A. M., Aggarwal, M. M., Rinella, G. Aglieri, Agocs, A. G., Salazar, S. Aguilar, Ahammed, Z., Ahmad, N., Masoodi, A. Ahmad, Ahn, S. U., Akindinov, A., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Alici, A., Alkin, A., Avina, E. Almaraz, Alt
    Physical Review Letters, 2011, Vol.106(3) [Peer Reviewed Journal]

    • Several versions

    D-Meson Azimuthal Anisotropy in Midcentral Pb-Pb Collisions at sqrts_{NN}=5.02  TeV

    Acharya, S, Adamová, D, Adolfsson, J, Aggarwal, M M, Aglieri Rinella, G, Agnello, M, Agrawal, N, Ahammed, Z, Ahmad, N, Ahn, S U, Aiola, S, Akindinov, A, Alam, S N, Alba, J L B, Albuquerque, D S D, Aleksandrov, D, Alessandro, B, Alfaro Molina, R, Alici
    Physical review letters, 09 March 2018, Vol.120(10), pp.102301 [Peer Reviewed Journal]

    • Several versions

    Exclusive J /ψ photoproduction off protons in ultraperipheral p -Pb collisions at sNN =5.02TeV

    Abelev, B., Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agostinelli, A., Agrawal, N., Ahammed, Z., Ahmad, N., Ahmed, I., Ahn, S. U., Ahn, S. A., Aimo, I., Aiola, S., Ajaz, M., Akindinov, A., Alam, S. N., Aleksandrov, D.
    Physical Review Letters, 2014, Vol.113(23), pp.urn:issn:0031-9007 [Peer Reviewed Journal]

    • Several versions

    Measurement of an Excess in the Yield of J/ψ at Very Low pT in Pb–Pb Collisions at √sNN = 2.76  TeV

    Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Alam, S. N., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A.
    Physical Review Letters, 2016, Vol.116(22), pp.urn:issn:0031-9007 [Peer Reviewed Journal]

    • Several versions

    J/psi Elliptic Flow in Pb-Pb Collisions at root s(NN)=5.02 TeV

    Acharya, S., Adamova, D., Adolfsson, J., Aggarwal, M. M., Rinella, G. Aglieri, Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Al-Turany, M., Alam, S. N., Albuquerque, D. S. D., Aleksandrov, D., Alessandro, B., Alfaro Molina, R., Ali, Y., Alici, A., Alkin, A.
    Physical Review Letters, 2017, Vol.119(24), pp.urn:issn:0031-9007 [Peer Reviewed Journal]

    • Several versions

    Centrality Dependence of the Charged-Particle Multiplicity Density at Midrapidity in Pb-Pb Collisions at sNN=5.02TeV

    Adam, J., Adamová, D., Aggarwal, M. M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S. U., Aiola, S., Akindinov, A., Alam, S. N., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A.
    Physical Review Letters, 2016, Vol.116(22), pp.urn:issn:0031-9007 [Peer Reviewed Journal]