innovation highlight

Active blades for helicopter rotors

Helicopters that are quieter and less affected by vibration remain an important goal in research. One promising approach is active blade twisting at higher frequencies. Small changes in the angle of attack will produce the requisite aerodynamic effect. To achieve this, the DLR is currently pursuing a new approach involving an active twist mechanism. Piezo-ceramic actuators integrated in the skin of the rotor blade control its twist. The piezoelectric elements expand or contract depending on the electrical field applied, producing deformations that are sufficient to reduce noise by 6 decibels and the level of vibration by 90 percent.

Rotor blade with embedded piezoelectric actuators

Topic: New Materials and Chemistry
Source: Adaptronik

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	innovation highlight Active blades for helicopter rotors Helicopters that are quieter and less affected by vibration remain an important goal in research. One promising approach is active blade twisting at higher frequencies. Small changes in the angle of attack will produce the requisite aerodynamic effect. To achieve this, the DLR is currently pursuing a new approach involving an active twist mechanism. Piezo-ceramic actuators integrated in the skin of the rotor blade control its twist. The piezoelectric elements expand or contract depending on the electrical field applied, producing deformations that are sufficient to reduce noise by 6 decibels and the level of vibration by 90 percent. Rotor blade with embedded piezoelectric actuators Topic: New Materials and Chemistry Source: Adaptronik	Print page Back