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A Hybrid Pose / Wrench Control Framework for Quadrotor Helicopters KU Leuven
This paper presents a hybrid pose / wrench control framework for quadrotor helicopters, allowing direct contact of the quadrotor with its environment and stable motion while in contact. The presented work explicitly takes into account the quadrotor's underactuation and utilizes a wrench estimator, able to estimate the wrench generated by the quadrotor using only quadrotor inputs and pose measurements. Experimental results of the quadrotor in ...
Conventional helicopters: an adaptiveness study for more electric and alternative propulsion technologies KU Leuven
The power plant and drive systems in a conventional helicopter cause high development and operating costs, compromise safety, and introduce performance limitations. Even though much effort is devoted to mechanical transmission systems, the use of electric components promises a higher reliability. Magnetic gearboxes address many of the problems in mechanical transmissions, but proved to be too heavy at this time. However, since this technology ...
High-speed impulsive noise prediction of helicopter rotors using a frequency-domain formulation Vrije Universiteit Brussel
This paper presents the application of a frequency domain formula to high-speed impulsive noise prediction of helicopter rotors with high tip Mach number. In order to account for the contribution of quadrupole sources located mainly outside the sonic cylinder, a supersonic permeable cylindrical data surface is selected. The advantage of the formulation being free of the Doppler singularity is thus demonstrated, for prediction of supersonic ...
Ten simple rules for Global North researchers to stop perpetuating helicopter research in the Global South Universiteit Gent
The practice of Global North (i.e., “richer” globalized countries located in the northern hemisphere, except for Australia and New Zealand) researchers making roundtrips to the Global South (i.e., “poorer” developing countries located around the tropics and in the Southern hemisphere) to collect materials and then process, analyze, and publish results with little to no involvement from local collaborators is referred to as “helicopter research” ...
Helicopter rotor noise prediction using a convected FW-H equation in the frequency domain Vrije Universiteit Brussel
In this paper, high-speed impulsive noise radiated from helicopter rotors in hover and forward flight is computed by using a convected FW-H equation in the frequency domain with a rotating permeable data surface. Compared to the time-domain formulations, the frequency-domain formula avoids retarded time computation and flow data interpolation with respect to the retarded time. In addition, the complicated emission surface construction is ...