Results 41 to 50 of about 3,688,567 (142)
Robust Trajectory Optimization of a Ski Jumper for Uncertainty Influence and Safety Quantification
Proceedings, 2018 This paper deals with the development of a robust optimal control framework for a previously developed multi-body ski jumper simulation model by the authors.
Patrick Piprek, Florian Holzapfel
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Journal of Advances in Modeling Earth Systems, 2017 NASA's Goddard Earth Observing System (GEOS) Earth System Model (ESM) is a modular, general circulation model (GCM), and data assimilation system (DAS) that is used to simulate and study the coupled dynamics, physics, chemistry, and biology of our planet.
J. Eric Nielsen +12 more
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Adaptive Fault–Tolerant Position Control of a Hexacopter Subject to an Unknown Motor Failure
International Journal of Applied Mathematics and Computer Science, 2018 This paper presents a fault tolerant position tracking controller for a hexarotor system. The proposed controller has a cascaded structure composed of a position and an attitude control loop.
Falconì Guillermo P. +2 more
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AIP Advances, 2020 An implicit large-eddy simulation method is used to numerically simulate the flowfield around a finite-span rectangular wing in pitch motion. The effect of the reduced frequency (k) on the stability of the leading-edge vortex (LEV) is studied.
JiaoLong Zhang +3 more
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Attitude Estimation of Skis in Ski Jumping Using Low-Cost Inertial Measurement Units
Proceedings, 2018 This paper presents an approach to estimate the attitude of skis for an entire ski jump using wearable, MEMS-based, low-cost Inertial Measurement Units (IMUs). First of all, a kinematic attitude model based on rigid-body dynamics and a sensor error model
Xiang Fang +2 more
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The NASA Carbon Airborne Flux Experiment (CARAFE): instrumentation and methodology [PDF]
Atmospheric Measurement Techniques, 2018 The exchange of trace gases between the Earth's surface and atmosphere strongly influences atmospheric composition. Airborne eddy covariance can quantify surface fluxes at local to regional scales (1–1000 km), potentially helping to bridge gaps between
G. M. Wolfe +18 more
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EASA’s “Open” Category for Military UAS: Opportunities and Limitations in the Field of Airworthiness
Aerospace, 2018 The European Aviation Safety Agency (EASA) plans to establish a sole risk-based set of regulations for drones to grant access to European airspace, thus opening a multibillion-euro market.
Oliver Hirling, Florian Holzapfel
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Multi-decadal records of stratospheric composition and their relationship to stratospheric circulation change [PDF]
Atmospheric Chemistry and Physics, 2017 Constituent evolution for 1990–2015 simulated using the Global Modeling Initiative chemistry and transport model driven by meteorological fields from the Modern-Era Retrospective analysis for Research and Applications version 2 (MERRA-2) is ...
A. R. Douglass +4 more
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Practical System Identification and Incremental Control Design for a Subscale Fixed-Wing Aircraft
ActuatorsAn incremental differential proportional integral (iDPI) control law using eigenstructure assignment gain design is tested in flight on a subscale platform to validate its suitability for fixed-wing flight control.
Rasmus Steffensen +2 more
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IEEE Access, 2020 Owing to the highly nonlinear dynamics and high number of nonlinear constraints, it is exceedingly difficult and computationally expensive to solve the cooperative trajectory planning problem of multimissile formation using existing approaches.
Chaoyue Liu, Cheng Zhang, Fenfen Xiong
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