scholarly journals The Elaboration of the Method of Fatigue Testing of the Rotor of the Mosups Plane Propulsion System

2016 ◽  
Vol 2016 (8) ◽  
pp. 97-103
Author(s):  
Dominik Głowacki ◽  
Mirosław Rodzewicz
Keyword(s):  
Fatigue Testing ◽  
Unmanned Aircraft ◽  
Propulsion System ◽  
Loading Cycle ◽  
Ducted Propeller ◽  
Simplified Method ◽  
Rotor Structure

AbstractThis paper concerns fatigue testing of the rotor of the propulsion system for the MOSUPS – an unmanned aircraft designed in a joint wing configuration, and equipped with a ducted propeller. The work presents the analysis of the stresses and deformations of the rotor structure as well as the form of the loading cycle. The aim of the paper is to introduce the concept of a simplified method of fatigue testing of multi-blade rotors. With the sophisticated geometry of the rotor in mind – the authors applied the FEM tools and implemented the ANSYS and nCode programs. The prototype of the fatigue stand built by the authors is also presented in the paper.

scholarly journals Optimization of SUAV’s propeller in a hover

2020 ◽  
Vol 313 ◽  
pp. 00045 ◽  
Author(s):  
Jakub Hnidka ◽  
Dalibor Rozehnal ◽  
Karel Maňas
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Propulsion System ◽  
Simple Method ◽  
Widespread Application ◽  
Method Of Calculation ◽  
Propeller Design ◽  
Aerial Vehicles ◽  
Simplified Method ◽  
System Components ◽  
Overall Efficiency

Small unmanned aerial vehicles (SUAVs) have found a widespread application in past decades. However, as the criticality of the missions for which they can be used increases, the demand for improvement of their efficiency increases as well. The paper focuses on a propeller driven SUAVs of a multirotor type, equipped with an electric motor, battery and propeller. The paper presents a simplified method of calculation of the SUAV maximal endurance, if the characteristics of all components of the propulsion system are known. To improve the overall efficiency of the propulsion system of an SUAV, the correct combination of all propulsion system components is critical. However, the largest impact on the maximal endurance is, arguably, caused by the propeller. The paper proposes a simple method of optimizing the propeller characteristics for hover and compares the proposed propeller design with conventional and commercially available propellers.

Gigacycle Fatigue Behaviour of Sintered WC-Co Hardmetals Investigated by Ultrasonic Resonance Testing

2015 ◽  
Vol 825-826 ◽  
pp. 1016-1023
Author(s):  
Agnieszka Betzwar Kotas ◽  
Brigitte Weiss ◽  
Herbert Danninger
Keyword(s):  
Powder Metallurgy ◽  
Fatigue Limit ◽  
Fatigue Testing ◽  
Fatigue Behaviour ◽  
Horizontal Branch ◽  
Loading Cycle ◽  
Tool Materials ◽  
Ultrasonic Resonance ◽  
Ultrasonic Fatigue ◽  
Percussion Drilling

Hardmetals, manufactured from powders by pressing and sintering, are the most important tool materials in service today. In many applications, such as milling or percussion drilling, they are subjected to fatigue with considerable loading cycle numbers. In the present study, the fatigue behaviour of hardmetals in push-pull loading was investigated up to Nmax= 1010using ultrasonic resonance fatigue testing. It showed that with all hardmetal grades investigated there is no fatigue “limit”, i.e. a horizontal branch of the S-N curve, but a consistent drop of the curve up to maximum N. Crack initiation was found to occur predominantly microstructure-controlled, as compared to defect controlled as typical for powder metallurgy tool steels.Keywords: gigacycle fatigue, WC-Co hardmetals, ultrasonic fatigue testing, fatigue limit

Characterisation of a hybrid, fuel-cell-based propulsion system for small unmanned aircraft

2014 ◽  
Vol 250 ◽  
pp. 204-211 ◽  
Author(s):  
D. Verstraete ◽  
K. Lehmkuehler ◽  
A. Gong ◽  
J.R. Harvey ◽  
G. Brian ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Unmanned Aircraft ◽  
Propulsion System

Hybrid-Electric, Heavy-Fuel Propulsion System for Small Unmanned Aircraft

2014 ◽  
Vol 7 (1) ◽  
pp. 126-134 ◽  
Author(s):  
Kyle Merical ◽  
Troy Beechner ◽  
Paul Yelvington
Keyword(s):  
Unmanned Aircraft ◽  
Propulsion System ◽  
Hybrid Electric

scholarly journals Propulsion System for Very High Altitude Subsonic Unmanned Aircraft

1998 ◽  
Author(s):  
David J. Bents ◽  
Ted Mockler ◽  
Jaime Maldonado ◽  
James L. Harp ◽  
Joseph F. King ◽  
...  
Keyword(s):  
High Altitude ◽  
Unmanned Aircraft ◽  
Propulsion System ◽  
Very High

scholarly journals Long-Autonomy Unmanned Aircraft Vehicle (UAV) for Quick Release of Ocean Minidrifters

2020 ◽  
Vol 37 (10) ◽  
pp. 1801-1809
Author(s):  
Antonio Gómez Roa ◽  
Xavier Flores-Vidal ◽  
Orlando Avendaño Gastelum ◽  
Rogelio Núñez ◽  
Andrés Sandoval Rangel ◽  
...  
Keyword(s):  
Sea Level ◽  
Data Transfer ◽  
Low Cost ◽  
Unmanned Aircraft ◽  
Quick Response ◽  
Time Data ◽  
Quick Release ◽  
Simplified Method ◽  
Technical Details ◽  
Ocean Measurements

AbstractIn this work we present an unmanned aircraft vehicle (UAV) designed from off-the-shelf components to release ocean minidrifters. Its endurance (~1 h), payload (~5 kg), offshore range (~30 km), capability of operating into wind conditions of ~10 kt (1 kt ≈ 0.51 m s−1), high-precision autopilot (2–3 m), and flying altitude of ~500 m above sea level, along with its relatively low cost [<$5,000 (U.S. dollars)] enables quick and relatively easy oceanographic applications beyond 10 km offshore. We report here the very first successful ocean drifter releases, performed along the Baja California coast, between Tijuana and Rosarito, Mexico, and the technical details of the UAV. About 50 experiments (flights) allowed us to improve the takeoff and landing, the release tunnel for minidrifters, the cruise speed and altitude to release drifters safely, and to implement a parachute that controls the speed of the freefalling minidrifters. Quick release of up to six drifters (armed with real-time data transfer and web display) between 2 and 12 km offshore were performed at ~500 m above sea level, during a single flight in under 15 min, as opposed to classic techniques using boats or ships that, although can transport much more weight, can take several hours, use more human resources, and increase cost. Here we propose a novel open-source technique that can be used as a simplified method for scientific ocean measurements, as a quick-response emergency tool to map spills or for search and rescue.

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