Unmanned aerial vehicle rotor arm structure with outer surface additionally provided with segmented constrained damping layer

Abstract

The invention provides an unmanned aerial vehicle rotor arm structure with the outer surface additionally provided with a segmented constrained damping layer. An unmanned aerial vehicle rotor arm comprises a rotor arm body, the constrained damping layer and a viscoelastic damping layer; the rotor arm body is of a hollow cylindrical structure made of a carbon fiber material; the constrained dampinglayer and the viscoelastic damping layer are each of a segmented hollow cylindrical shell structure, and are made of an aluminum alloy and ZN-1 damping rubber correspondingly; and the rotor arm, theviscoelastic damping layer and the constrained damping layer are tightly bonded in sequence from inside to outside. By additionally arranging the segmented constrained damping layer on the outer surface of the unmanned aerial vehicle rotor arm, the viscoelastic damping layer deforms through elastic bending vibration of the rotor arm, and thus vibration energy of the unmanned aerial vehicle rotor arm is dissipated rapidly for vibration reduction. The structure is simple, a main body structure of an unmanned aerial vehicle is not affected, extra additional mass and control device are not needed,the flight stability of the unmanned aerial vehicle is improved, and the vibration suppression effect in practical application is remarkable.

Description

technical field [0001] The invention relates to the mechanical field, in particular to a shock absorbing structure, and more specifically to a rotor arm vibration control structure of a multi-rotor drone. Background technique [0002] At present, UAVs have been widely used in high-altitude shooting, logistics, and farm work. In particular, the rapid development of the oil-driven multi-rotor UAV in recent years has further promoted its application due to its continuous improvement in carrying capacity, but the large load-bearing weight aggravates the vibration problem of the whole machine structure, which not only affects the The flight stability of the UAV is also very easy to cause damage to the structure of the UAV. [0003] In recent years, a large number of related studies have shown that the structural vibration of UAVs mainly comes from the resonance of the rotor arm, and the vibration mode is mainly in the bending mode. Traditional vibration suppression methods usua...

AI Technical Summary

Problems solved by technology

Although the passive vibration absorber can produce significant effects at the natural frequency, the addition of a relatively large-mass vibration absorber to the drone will seriously affect its endurance, load-bearing capacity, and flight stability; represented by piezoelectric ceramics The active vibration suppression method has greater flexibility and has a good vibration suppression effect on the low frequency band of vibration, but its control system needs to provide an additional energy supply device, which not only increases the economic cost of the whole machine structure, but also reduces The robustness of the system, so it has great limitations in the application of vibration suppression of UAV rotor arm

Images