Driving mechanism for realizing variable sweepback of helicopter rotor tip by using shape memory alloy

Abstract

The invention discloses a driving mechanism for realizing variable sweepback of a helicopter rotor tip by using shape memory alloy. The invention belongs to an active variable propeller tip intelligent rotor technology for improving aerodynamic characteristics of rotors. to the invention provides the driving mechanism for achieving variable sweepback of the helicopter rotor tip through the shape memory alloy, the helicopter rotor tip can be stably driven in a large centrifugal force field and a complex aerodynamic environment. The driving mechanism is characterized in that: the driving mechanism comprises a fixing assembly, an actuating plate and a pair of linear driving assemblies. The fixing assembly is fixedly connected with the paddle, the center of the actuating plate is hinged to theside, facing the paddle tip, of the fixed assembly, and the pair of linear driving assemblies is connected to the fixed assembly, so that the actuating plate is driven by the pair of linear driving assemblies to rotate. By changing the loading current of the shape memory alloy wires, the sweepback angle of the propeller tip is controlled, and then the helicopter rotor wing can obtain a good aerodynamic effect under various flight conditions.

Description

technical field [0001] The invention belongs to the intelligent rotor technology for actively changing the tip of the rotor to improve the aerodynamic characteristics of the rotor, and is mainly applicable to the active control of the tip of the helicopter and the improvement of the aerodynamic characteristics of the rotor. Background technique [0002] For a long time, the tip of the blade has played an important role in improving the flight performance of the helicopter and the aerodynamic performance of the rotor. Compared with the traditional rectangular blades, the tip-swept blades can reduce the compressibility of the air around the forward blades and delay the occurrence of the shock wave of the forward blades, thereby increasing the resistance divergence Mach number of the forward blades and improving the helicopter's performance. The forward flight speed and the sweep of the blade tip can reduce the vortex interference and noise to a certain extent. At present, the...

AI Technical Summary

Problems solved by technology

At present, there are several advanced propeller tips abroad (BERP tips, blue-edge tips, saber-shaped tips, etc.) all adopt a single fixed-sweep tip design, and these tips usually only meet certain specific flight conditions Due to the performance requirements of the helicopter rotor, it is difficult to adapt to the complex flight environment of the helicopter. Therefore, it is very important to design an active variable sweep tip drive mechanism to improve the aerodynamic characteristics of the helicopter rotor and the adaptability of the helicopter to the complex flight environment. Practical significance

[0003] The difficulty of active variable sweep tip control is that the tip works in a very large centrifugal force field and complex aerodynamic environment, and the space of the blade is small. It is difficult for a general drive to meet its requirements for large drive power and small drive space. Require

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