Wybrane przedsięwzięcia współdzielonych przez współczesnych konsumentów usług transportowych. Wyniki badań

The primary objective of the paper is to discuss examples of sharing transport services in the Polish market as manifestations of the application of the idea of the sharing economy by contemporary consumers. Based on the essence of the considered concept and/or economy model, a review of previous studies was made and subjects for the authors’ own research were selected. The case study and online survey methods were used. In particular, services offered under the Traficar, Uber, and Wavelo brands were analysed. The research that was conducted made it possible to identify the determinants, as well as the advantages and disadvantages, of this type of market practice. It also allowed to develop certain recommendations for marketers interested in the methodical application of sharing services and/or products.Celem głównym opracowania było omówienie przykładów współdzielenia przez współczesnych konsumentów usług transportowych z rynku polskiego jako przejawu zastosowania idei ekonomii współdzielenia. Wychodząc od istoty uwzględnianej koncepcji i/lub modelu gospodarki, dokonano przeglądu dotychczasowych badań i wybrano obiekty do badań własnych autorów opracowania. Zastosowano metody studiów przypadków i ankietę internetową. W szczególności objęto analizą przedsięwzięcia oferowane pod markami Traficar, Uber i Wavelo. Przeprowadzone badania umożliwiły zidentyfikowanie uwarunkowań oraz zalet i wad tego typu praktyk rynkowych. Pozwoliły także na wypracowanie pewnych rekomendacji dla marketerów zainteresowanych metodycznym wdrażaniem współdzielenia usług i/lub produktów

Improving hovering performance of tethered unmanned helicopters with nonlinear control strategies

Abstract-Hovering capabilities of unmanned helicopters can be seriously affected by wind effects. One possible solution for improving hovering performance under such circumstances is the use of a tethered setup that takes advantage of the tension exerted on the cable that links the helicopter to the ground. This paper presents a more elaborated strategy for helicopter control in this augmented setup that extends previous work on the subject by the authors. Particularly, a combination of classical PID control laws together with model inversion blocks constitutes the base of the new controller. Additionally, feed-forward action for counteracting rotational couplings is also accounted for. The resulting nonlinear control structure considers the complex and nonlinear nature of the tethered system in a better way. Several demonstrating simulations under artificially generated wind influences are presented to endorse the validity of the new proposed controller

Towards Autonomous Autorotation Landing for Small Size Unmanned Helicopters

The consideration of safety issues in the operation of helicopters involves the capability to perform emergency descending maneuvers through the autorotation principle when the engine is no longer supplying power. When comparing manned and unmanned helicopters, the lower rotor inertia of UAV configurations makes this functionality even more challenging for the pilot since more accurate timing and speed control of the flare phase are required. This paper presents a complete set of guidelines to design a controller for the autonomous autorotation landing of an UAV. This analysis is based on experimental data that corresponds to autorotation landings of a small-size helicopter carried out by a skillful pilot

Compliance control of a cable-suspended aerial manipulator using hierarchical control framework

Aerial robotic manipulation is an emergent trend that poses several challenges. To overcome some of these, the DLR cable-Suspended Aerial Manipulator (SAM) has been envisioned. SAM is composed of a fully actuated multi-rotor anchored to a main carrier through a cable and a KUKA LWR attached below the multi-rotor. This work presents a control method to allow SAM, which is a holonomically constrained system, to perform such interaction tasks using a hierarchical control framework. Within this framework, compliance control of the manipulator end-effector is considered to have the highest priority. The second priority is the control of the oscillations induced by, for example, the motion of the arm or physical contact with the environment. A third priority task is related to the internal motion of the manipulator. The proposed approach is validated through simulations and experiments