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Aerodynamic functions

Active Aero Rims

Hit the nail on the head - for decades the automotive industry has been working on concepts to minimize the annoying air resistance on the fast-rotating wheel. This accounts for a significant proportion of the total air resistance. The designs of newer electric vehicles show that closed rim designs with smaller openings are on the rise for reasons of efficiency and range. This allows air resistance to be reduced by a single-digit percentage, but no more. Only completely closing the rim can completely prevent the air flow and the harmful rotor effect of the wheel. However, this conflicts with the necessary cooling of the brake chamber in the event of an emergency, e.g. after descending a pass. Actuator modules from CompActive now make it possible to integrate several ventilation flaps into the rim, which open automatically using the waste heat from the braking system and initiate cooling through the wheel surface. Since they do not require a power source, they can also be easily applied to rotating components: The flat bending actuators offer sufficient travel and the necessary robustness of an element that is moved quickly in rotation in road traffic.

Active Vortex Generators

The flight tests were carried out as part of a ZIM cooperation project, partner Institute for Composite Materials and DG Aircraft Construction. Adaptive turbulators can improve the aerodynamic performance of almost any wing aircraft. They offer the possibility of reducing the minimum flight speed without compromising cruise efficiency. The application's boundary conditions - very limited installation space, the lowest possible weight and the implementation of a large number of small control elements - make it difficult to implement this functionality with conventional mechanical systems. Hybrid composites made of SMA and FRP with material-integrated actuators enable an actively controllable function even under such requirements. A single active turbulator with a height of 1.8 mm and a weight of 1.5 g is able to generate a peak deflection of 17 mm.

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