Device and method for measuring motion state of external helicopter blades for flight test

Abstract

The invention relates to a flight test externally mounted helicopter blade motion state measurement device and method, which belongs to the technical field of helicopter flight test measurement. and memory cards. The embedded computer is connected with two high-speed cameras, fill light, light receiver, GPS timing equipment and memory card; the embedded computer includes a trigger control module, a collection and recording module, and a data calculation module, and receives signals through the trigger control module and send an instruction, the acquisition and recording module is used to acquire the image information of the high-speed camera, and the data calculation module processes the image information and stores it in the acquisition and recording module. The integrated design of the device is installed on the external pylon, and the whole device passes through the external 28V power interface, which is convenient for modification and application in the airborne environment; the position and attitude of the camera are calibrated in advance according to the measurement state of the rotor, and there is no need to repeat the calibration. The modification cycle and modification difficulty are reduced.

Description

technical field [0001] The invention belongs to the technical field of helicopter flight test measurement, and in particular relates to a flight test external-mounted helicopter blade motion state measurement device and method. Background technique [0002] Helicopter blades are an important part of the helicopter rotor lift system. Its characteristic parameters directly affect the flight quality of the helicopter. With the development of composite material technology, helicopter rotors have undergone many new changes. Since the 1960s, hingeless and bearingless rotors have appeared one after another, improving the comprehensive performance of the rotor. performance. However, the characteristics of the new rotor without twist and bearing will cause complex coupling problems between nonlinear rotor flapping and torsional motion. In order to grasp and analyze the computer dynamics performance and ensure flight safety, it is necessary to obtain the motion state of the rotor bla...

AI Technical Summary

Problems solved by technology

[0004] In the article "Review of Measurement Methods for Elastic Deformation of Rotor Blades Abroad" on pages 65-68 of Issue 195 of "Helicopter Technology" in 2018, the grating photography method (FCM) has high requirements on the blades and cannot obtain the displacement results in the shimmy direction ; The traditional strain electrical measurement method has poor measurement accuracy for blades with complex shapes; the kinematical method has many constraints; and there are many modification lines, which will affect the overall aerodynamic performance of the aircraft. The three-dimensional image recognition method has a complex test system. Preparatory work is heavy

In the "Semiconductor Optoelectronics" journal, Volume 34, Issue 5, 904-908, 2013, "The Dynamic Three-Dimensional Measurement Method of Helicopter Rotor Based on Marking Points", it is introduced that the measurement method based on stereo vision can be measured without contact, which can overcome the existing problems in traditional methods. The problem of low precision

[0005] For blade measurement, stereo vision measurement method is often used, but there is no stereo vision measurement equipment for flight test in China that can be used for flight test.

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