scholarly journals Flights of a Multirotor UAS with Structural Faults: Failures on Composite Propeller(s)

Data ◽  
2019 ◽  
Vol 4 (3) ◽  
pp. 128
Author(s):  
Srikanth Gururajan ◽  
Kyle Mitchell ◽  
William Ebel
Keyword(s):  
Carbon Fiber ◽  
Manual Control ◽  
Flight Tests ◽  
Saint Louis ◽  
Saint Louis University ◽  
Flight Cage ◽  
Different Types ◽  
Failure Conditions ◽  
College Of Engineering ◽  
Composite Carbon

Data acquired from several flights of a custom-fabricated Hexacopter Unmanned Aerial System (UAS) with composite structure (carbon fiber arms and central hub) and composite (carbon fiber) propellers are described in this article. The Hexacopter was assembled from a commercially available kit (Tarot 690) and flown in manual and autonomous modes. Takeoffs and landings were under manual control and the bulk of the flight tests was conducted with the Hexacopter in a “position hold” mode. All flights were flown within the UAS flight cage at Parks College of Engineering, Aviation and Technology at Saint Louis University for approximately 5 min each. Several failure conditions (different types, artificially induced) on the composite (carbon fiber) propellers were tested, including failures on up to two propellers. The dataset described in this article contains flight data from the onboard flight controller (Pixhawk) as well as three accelerometers, each with three axes, mounted on the arms of the Hexacopter UAS. The data are included as supplemental material.

scholarly journals Evaluation of a Baseline Controller for Autonomous “Figure-8” Flights of a Morphing Geometry Quadcopter: Flight Performance

Drones ◽  
2019 ◽  
Vol 3 (3) ◽  
pp. 70
Author(s):  
Ye Bai ◽  
Srikanth Gururajan
Keyword(s):  
Flight Test ◽  
Flight Performance ◽  
Intersection Angle ◽  
Lower Velocity ◽  
Saint Louis ◽  
Saint Louis University ◽  
Geometry Configuration ◽  
College Of Engineering ◽  
Resource Aware ◽  
Pitch Damping

This article describes the design, fabrication, and flight test evaluation of a morphing geometry quadcopter capable of changing its intersection angle in-flight. The experiments were conducted at the Aircraft Computational and Resource Aware Fault Tolerance (AirCRAFT) Lab, Parks College of Engineering, Aviation and Technology at Saint Louis University, St. Louis, MO. The flight test matrix included flights in a “Figure-8” trajectory in two different morphing configurations (21° and 27°), as well as the nominal geometry configuration, two different flight velocities (1.5 m/s and 2.5 m/s), two different number of waypoints, and in three planes—horizontal, inclined, and double inclined. All the experiments were conducted using standard, off-the-shelf flight controller (Pixhawk) and autopilot firmware. Simulations of the morphed geometry indicate a reduction in pitch damping (42% for 21° morphing and 57.3% for 27° morphing) and roll damping (63.5% for 21° morphing and 65% for 27° morphing). Flight tests also demonstrated that the dynamic stability in roll and pitch dynamics were reduced, but the quadcopter was still stable under morphed geometry conditions. Morphed geometry also has an effect on the flight performance—with a higher number of waypoints (30) and higher velocity (2.5 m/s), the roll dynamics performed better as compared to the lower waypoints and lower velocity condition. The yaw dynamics remained consistent through all the flight conditions, and were not significantly affected by asymmetrical morphing of the quadcopter geometry. We also determined that higher waypoint and flight velocity conditions led to a small performance improvement in tracking the desired trajectory as well.

scholarly journals DELINEATION OF FLOOD PLAIN EXTENSION

2020 ◽  
Author(s):  
FARHAD SAKHAEE ◽  
SAHAR AZIMNEZHAD
Keyword(s):  
Stream Water ◽  
Management Strategies ◽  
Buffer Zone ◽  
Flood Plain ◽  
Discharge Condition ◽  
High Discharge ◽  
Saint Louis ◽  
Saint Louis University ◽  
Floodplain Delineation ◽  
College Of Engineering

Floodplain delineation is an effective approach in either avoiding of water crisis or making pragmatic decisions in terms of water management strategies. In this study a flood plain extension has been developed in ArcGIS and HE-CRAS models and a comparison has been made within three different scenarios of discharge. The results showed in low and medium discharge scenarios the buffer zone acts as a safety factor zone to adjacent infrastructure either agricultural or residential, but in high discharge condition buffer zone is entirely filled with stream water hence yet more safety regulation should be considered in order to avoid human and resource loss or damage within adjacent areas. Keywords: Flood plain delineation, Water depth profile, HE-CRAS, F. Sakhaee. Parks College of Engineering, Aviation and Technology, Civil Engineering Dept., Saint Louis University, USA

The Impact of Mental States on Semi-autonomous Driving Takeover Performance: A Systematic Review

2020 ◽  
Vol 64 (1) ◽  
pp. 1372-1376
Author(s):  
Gaojian Huang ◽  
Christine Petersen ◽  
Brandon J. Pitts
Keyword(s):  
Systematic Review ◽  
Autonomous Vehicles ◽  
Response Times ◽  
Autonomous Driving ◽  
Mental States ◽  
Manual Control ◽  
Monitoring Systems ◽  
Wide Range ◽  
Different Types ◽  
The Impact

Semi-autonomous vehicles still require drivers to occasionally resume manual control. However, drivers of these vehicles may have different mental states. For example, drivers may be engaged in non-driving related tasks or may exhibit mind wandering behavior. Also, monitoring monotonous driving environments can result in passive fatigue. Given the potential for different types of mental states to negatively affect takeover performance, it will be critical to highlight how mental states affect semi-autonomous takeover. A systematic review was conducted to synthesize the literature on mental states (such as distraction, fatigue, emotion) and takeover performance. This review focuses specifically on five fatigue studies. Overall, studies were too few to observe consistent findings, but some suggest that response times to takeover alerts and post-takeover performance may be affected by fatigue. Ultimately, this review may help researchers improve and develop real-time mental states monitoring systems for a wide range of application domains.

The SAMP8 mouse as a model for Alzheimer disease: studies from Saint Louis University

2004 ◽  
Vol 1260 ◽  
pp. 23-28 ◽  
Author(s):  
J.E Morley ◽  
W.A Banks ◽  
V.B Kumar ◽  
S.A Farr
Keyword(s):  
Alzheimer Disease ◽  
Saint Louis ◽  
Saint Louis University ◽  
Samp8 Mouse
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