TY  - JOUR
A1  - Hammer, Thorben
A1  - Quitter, Julius
A1  - Mayntz, Joscha
A1  - Bauschat, J.-Michael
A1  - Dahmann, Peter
A1  - Götten, Falk
A1  - Hille, S.
A1  - Stumpf, E.
T1  - Free fall drag estimation of small-scale multirotor unmanned aircraft systems using computational fluid dynamics and wind tunnel experiments
JF  - CEAS Aeronautical Journal
N2  - New European Union (EU) regulations for UAS operations require an operational risk analysis, which includes an estimation of the potential danger of the UAS crashing. A key parameter for the potential ground risk is the kinetic impact energy of the UAS. The kinetic energy depends on the impact velocity of the UAS and, therefore, on the aerodynamic drag and the weight during free fall. Hence, estimating the impact energy of a UAS requires an accurate drag estimation of the UAS in that state. The paper at hand presents the aerodynamic drag estimation of small-scale multirotor UAS. Multirotor UAS of various sizes and configurations were analysed with a fully unsteady Reynolds-averaged Navier–Stokes approach. These simulations included different velocities and various fuselage pitch angles of the UAS. The results were compared against force measurements performed in a subsonic wind tunnel and provided good consistency. Furthermore, the influence of the UAS`s fuselage pitch angle as well as the influence of fixed and free spinning propellers on the aerodynamic drag was analysed. Free spinning propellers may increase the drag by up to 110%, depending on the fuselage pitch angle. Increasing the fuselage pitch angle of the UAS lowers the drag by 40% up to 85%, depending on the UAS. The data presented in this paper allow for increased accuracy of ground risk assessments.
KW  - Multirotor UAS
KW  - Drag estimation
KW  - CFD
KW  - Wind tunnel experiments
KW  - Wind milling
Y1  - 2023
U6  - http://dx.doi.org/10.1007/s13272-023-00702-w
SN  - 1869-5590 (Online)
SN  - 1869-5582 (Print)
N1  - Corresponding author: Thorben Hammer
PB  - Springer
CY  - Wien
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
A1  - Hagemeister, Wilhelm
A1  - Nagel, Günther
A1  - Exner, Peter
T1  - Geregelte Innenzahnradpumpe im Mehrquadrantenbetrieb Geschwindigkeits- und Positionsregelung eines hydraulischen Handlinggerätes
JF  - O+P Ölhydraulik und Pneumatik. 24 (2006), H. 1
Y1  - 2006
SN  - 0341-2660
SP  - 24
EP  - 28
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
A1  - Hagemeister, W.
A1  - Nagel, 
A1  - Exner, 
T1  - Geschwindigkeits- und Positionsregelung eines hydraulischen Handlinggerätes in einem Ziegelwerk durch frequenzgeregelte Innenzahnradpumpe im Mehrquadrantenbetrieb
JF  - Fluid power focused on applications : 3rd International Fluid Power Conference (3rd IFK) ; [conference proceedings, March 5th and 6th 2002, Aachen, Germany]. Fluidtechnik, Band T3
Y1  - 2002
SN  - 3-8265-9900-4
N1  - Konferenz-Einzelbericht
SP  - 83
EP  - 94
PB  - Shaker
CY  - Aachen
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
T1  - Offen für neue Modelle. GL-Hydraulik setzt neues Simulationssystem ein
JF  - Fluid Heft Sonderpublikation Fluid-Technik. 29 (1995)
Y1  - 1995
SN  - 0015-461X
SP  - 8
EP  - 10
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
A1  - Mager, M.
T1  - Einfluß der Zusammensetzung der abzuscheidenden Verschmutzung auf die Abscheideleistung von Hydraulikfiltern
JF  - Ölhydraulik und Pneumatik. 38 (1994), H. 4
Y1  - 1994
SN  - 0341-2660
SP  - 212
EP  - 214
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
T1  - Funktionsweise von Hydraulikfiltern
JF  - Ölhydraulik und Pneumatik. 37 (1993), H. 2
Y1  - 1993
SN  - 0341-2660
SP  - 118
EP  - 122
ER  - 
TY  - JOUR
A1  - Dahmann, Peter
T1  - Leistungsfähigkeit von Hydraulikfiltern bei unterschiedlichen Betriebsbedingungen
JF  - Ölhydraulik und Pneumatik. 34 (1990), H. 10
Y1  - 1990
SN  - 0341-2660
SP  - 682
EP  - 688
ER  - 
TY  - JOUR
A1  - Saffe, P.
A1  - Lodewiks, J.
A1  - Haas, H.-J.
A1  - Feigel, H.-J.
A1  - Ulrich, H.
A1  - Mauer, J.
A1  - Ortwig, H.
A1  - Dahmann, Peter
A1  - Rotthäuser, S.
A1  - Tao, J.
A1  - Ohlischläger, O.
A1  - Scholz, D.
A1  - Bergmann, M.
A1  - Anders, P.
T1  - Neues von ASB Antreiben – Steuern – Bewegen
JF  - Ölhydraulik und Pneumatik. Vol. 33 (1989), H. 7
Y1  - 1989
SN  - 0341-2660
SP  - 550
EP  - 572
ER  -