Method for measuring swing angle and pivot point of engine flexible spraying pipe

Abstract

The invention provides a method for measuring the swing angle and the pivot point of an engine flexible spraying pipe. The method includes the steps of creating a specific coordinate system, and installing a high-speed camera in the axial direction or the lateral direction; arranging characteristic identifications on the inner side or the outer side of the spraying pipe; calibrating the pixel size of the camera, and collecting continuous image data in the swing process of the spraying pipe through the high-speed camera; extracting pixel coordinates of characteristic points one frame by one frame, and obtaining characteristic displacement through converting; calculating the swing angle or the pivot point of the spraying pipe. According to the method, image collecting is carried out through the high-speed camera, rapid arranging can be achieved, implementing is convenient, and the arranging is not limited by space; in addition, as a non-contact measuring mode is adopted, the limitation of the response speed of a sensor in traditional contact type measuring is avoided, and the response speed is high; as the characteristic identifications are arranged on the inner side or the outer side of the spraying pipe and resolved in a plane conversion mode into different planes for resolving, a complex three-dimensional model does not need to be built, the measuring accuracy is high, and the calculation method is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of flexible nozzle monitoring and control, and more specifically, to a method for testing the swing angle and swing center of a flexible nozzle of an engine. Background technique [0002] Compared with the fixed nozzle, the flexible nozzle can make the missile have stronger trajectory maneuverability. In order to accurately control the swing state of the nozzle, it is very important to be able to accurately test the motion state of the nozzle. [0003] The current national industry standard for testing the swing angle of solid rocket swing nozzles uses the contact measurement method, that is, the displacement changes of each feature point of the nozzle are obtained by arranging sensors, ejector rods and other means, and then the angle is reversely calculated according to the displacement. However, for the joint swing test, the installation position of the sensor for contact measurement is limited, and there ...

AI Technical Summary

Problems solved by technology

However, this method requires a lot of time for positioning, modeling and calibration in practical engineering applications, and the operation is inconvenient, and the calculation error increases nonlinearly.

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