Aeroengine torque detection system and detection method based on surface acoustic wave tags

Abstract

The invention discloses a surface acoustic wave tag-based torque detection system and a detection method. Four time-division multiple access tags are used to detect the dynamic torque of an aeroengine. The four tags are arranged in differential symmetry along the circumference of the engine shaft. By optimizing the overall topology of the number and position of all reflection gratings, it is possible not only to measure the time delay and phase of all echo pulse signals simultaneously, but also to use The proportional relationship of the distance between adjacent reflective gratings adopts a step-by-step recursive method to obtain an unambiguous phase difference between the farthest echo pulses, which can maximize the distance between the farthest reflective gratings on the same label and improve the torque detection accuracy. The reader transmits the phase code modulated binary phase keying pulse, and uses the corresponding matched filter to compress the echo in time domain, which can not only reduce the distance between the nearest reflective grating, increase the torque detection range, but also Improve the signal-to-noise ratio of the echo signal and enhance the anti-interference ability in extreme environments.

Description

Technical field: [0001] The invention relates to an aeroengine torque detection system and a detection method based on a surface acoustic wave tag, belonging to the field of wireless passive sensing. Background technique: [0002] Torque is one of the most important experimental test parameters for aeroengines. Regardless of whether it is a complete machine or a component bench test, before mass production test flight, during service, and after regular maintenance, it is necessary to detect the torque of the aero-engine to ensure that the engine is in a healthy operating state. [0003] According to the detection principle, the torque sensor can be divided into three types: strain type, angle type and reaction force type, and the angle type can be subdivided into magnetoelectric type, photoelectric type and capacitive type. Various existing torque sensors have their own advantages, but also have obvious disadvantages or use limitations: For strain-type torque sensors, facto...

AI Technical Summary

Problems solved by technology

[0014] The present invention aims at the difficulty of reliable power supply and signal transmission existing in current aero-engine torque detection and the problems existing in the existing torque detection scheme using surface acoustic wave technology for aero-engine torque detection, and proposes a surface acoustic wave tag-based Aviation engine torque detection system and detection method

Images