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

Abstract

The invention discloses a device and method for measuring the motion state of external hanging helicopter blades in a flight test, and belongs to the technical field of helicopter flight test measurement. The device comprises two high-speed cameras, a GPS time service device, a light supplement lamp, an embedded computer, a light receiver, an external hanging frame and a memory card, wherein the embedded computer is connected with the two high-speed cameras, the light supplement lamp, the light receiver, the GPS time service device and the memory card and comprises a trigger control module, anacquisition recording module and a data resolving module; the trigger control module receives signals and sends instructions; the acquisition recording module is used for acquiring image informationof the high-speed cameras; and the data resolving module processes the image information and then stores the image information in the acquisition recording module. The device is integrally designed and installed on the external hanging frame, and is convenient to modify and apply in an airborne environment through an external 28-V power interface as a whole; and the position postures of the cameras are calibrated in advance according to the measurement state of a rotor wing without repeated calibration, the modification period is shortened, and the modification difficulty is 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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