Suchergebnisse

Denne kommenterede billedserie handler om de samarbejder, som Børnegården i Tønder indgik i, med henholdsvis Tønder Kulturskole og Museum Sønderjylland. Forfatterne beskriver forskellige processer, hvor en gruppe børn besøger kulturinstitutionerne, får inspiration fra kulturhistorien og mundtlige fortællinger, og selv udforsker en række skabende processer, der leder frem til ferniseringer.

Autonomous vehicle functions in safety-critical situations show promise in reducing the risk and saving lives in accidents compared to existing safety systems. Consequently, it is from many perspectives advantageous to be able to quantify the potential benefits of new autonomous systems for vehicle maneuvers at-the-limit of tire friction. Here, to estimate the potential in terms of saved lives and reduced degree of injuries in accidents for new, not yet existing systems, a framework has been developed by combining available historic data, in the form of crash databases, and statistical methods with comparative calculations of vehicle behavior using numerical optimization rather than simulation. The framework performs effectively, it gives interesting insights into the relation between more traditional active yaw control and optimal autonomous lane-keeping control, and it clearly demonstrates the potential of saved lives by using autonomous vehicle maneuvers. ; Funding: Wallenberg AI, Autonomous Systems and Software Program (WASP) - Knut and Alice Wallenberg Foundation; ELLIIT Strategic Research Area - Swedish Government

Unternehmen initiieren regelmäßig Projekte, um durch ständige Anpassung und Veränderung ihre Wettbewerbsfähigkeit zu sichern. Zur effizienten Planung und Steuerung der Projekte werden Modelle des Multiprojektmanagements (MPM) eingesetzt. In diesem Beitrag werden Abhängigkeiten zwischen Wirkgrößen solcher Modelle in Form von Stell- und Regelgrößen untersucht, um das MPM um ein Wirkmodell nach dem Vorbild der Produktionsplanung und -steuerung (PPS) erweitern zu können.
 
Companies regularly initiate projects to ensure their competitiveness through constant adaptation and change. Multi-project management (MPM) models are used to plan and control projects efficiently. This paper examines dependencies between impact variables and introduces actuating variables and control variables to enable extending MPM by including an impact model, as it is known from production planning and control (PPC).

With new developments in sensor technology, a new generation of vehicle dynamics controllers is developing, where the braking and steering strategies use more information, e.g. knowledge of road borders. The basis for vehicle-safety systems is how the forces from tyre–road interaction is vectored to achieve optimal total force and moment on the vehicle. To study this, the concept of attainable forces previously proposed in literature is adopted, and here a new visualisation technique is devised. It combines the novel concept of attainable force volumes with an interpretation of how the optimal solution develops within this volume. A specific finding is that for lane-keeping it is important to maximise the force in a certain direction, rather than to control the direction of the force vector, even though these two strategies are equivalent for the friction-limited particle model previously used in some literature for lane-keeping control design. More specifically, it is shown that the optimal behaviour develops on the boundary surface of the attainable force volume. Applied to lane-keeping control, this observation indicates a set of control principles similar to those analytically obtained for friction-limited particle models in earlier research, but result in vehicle behaviour close to the globally optimal solution also for more complex models and scenarios. ; Funding agencies: Swedish Government; Wallenberg AI, Autonomous Systems and Software Program (WASP) - Knut and Alice Wallenberg Foundation

Stability control of a vehicle in autonomous safety-critical at-the-limit manoeuvres is analysed from the perspective of lane keeping or lane changing, rather than that of yaw control as in traditional ESC systems. An optimal control formulation is developed, where the optimisation criterion is a linear combination of the initial and final velocity of the manoeuvre. Varying the interpolation parameter in this formulation turns out to result in an interesting family of optimal braking and steering patterns in stabilising manoeuvres. The two different strategies of optimal lane-keeping control and optimal yaw control are shown to be embedded in the formulation and result from the boundary values of the parameter. The results provide new insights and have the potential to be used for future safety systems that adapt the level of braking to the situation at hand, which is demonstrated through examples of how to exploit theresults. ; Funding agencies: Swedish Government (Sveriges Regering); Wallenberg AI, Autonomous Systems and Software Program (WASP) (Knut och Alice Wallenbergs Stiftelse) - Knut and Alice Wallenberg Foundation