A Driving Mechanism Using Shape Memory Alloy to Realize Helicopter Rotor Tip Sweep Change

Abstract

The invention discloses a drive mechanism for realizing the variable sweep of the helicopter rotor tip by using a shape memory alloy. The invention belongs to the intelligent rotor technology for actively changing the tip of the rotor to improve the aerodynamic characteristics of the rotor. A drive mechanism that utilizes shape memory alloys to achieve sweepback of the helicopter rotor tip is proposed, which can stably drive the tip of the helicopter in a large centrifugal force field and complex aerodynamic environment. The technical solution of the present invention is: the drive mechanism includes a fixed assembly, an actuating plate and a pair of linear drive assemblies, the fixed assembly is fixedly connected to the paddle, and the center of the actuating plate is hinged at the center of the fixed assembly facing the paddle On the pointed side, a pair of linear drive assemblies are connected to the fixed assembly, so that the actuating plate can rotate under the drive of the pair of linear drive assemblies. By changing the loading current of the shape memory alloy wire, the control of the sweep angle of the blade tip can be realized, so that the helicopter rotor can obtain better aerodynamic effects under various flight conditions.

Description

technical field [0001] The invention belongs to the intelligent rotor technology with active pitch change for improving the aerodynamic characteristics of the rotor, and is mainly suitable for the active control of the blade tip of the helicopter and improving the aerodynamic characteristics of the rotor. Background technique [0002] The propeller tip has always played an important role in improving the flight performance of the helicopter and the aerodynamic performance of the rotor. Compared with the traditional rectangular blade, the tip swept blade can reduce the compressibility of the air around the forward blade, delay the occurrence of the shock wave of the forward blade, thus increase the resistance divergence Mach number of the forward blade, and improve the helicopter's performance. The forward flying speed and the swept of the propeller tip can reduce the propeller vortex interference and noise to a certain extent. At present, there are several advanced propelle...

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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