A coaxial twin-rotor helicopter and an inter-blade distance measuring device thereof

By combining a trigger acquisition system and a radar ranging module, the real-time and accuracy issues of measuring the distance between the upper and lower rotor blades of a coaxial twin-rotor helicopter are solved, achieving high-precision blade distance measurement and supporting flight safety and design optimization.

CN117719692BActive Publication Date: 2026-07-24CHINA HELICOPTER RES & DEV INST
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
CHINA HELICOPTER RES & DEV INST
Filing Date
2023-11-13
Publication Date
2026-07-24

AI Technical Summary

Technical Problem

Existing technologies make it difficult to measure the distance between the upper and lower rotor blades of a coaxial twin-rotor helicopter in real time and with high accuracy, especially when rotating at high speeds, which affects flight safety and design optimization.

Method used

It adopts a trigger acquisition system and a radar ranging module, and uses photoelectric sensors and reflective grids in conjunction with radar sensors to achieve discontinuous ranging. It uses a linear frequency modulated continuous wave system for distance calculation. The integrated device is easy to install.

Benefits of technology

It enables high-precision real-time measurement of the distance between the upper and lower main rotor blades of a coaxial twin-rotor helicopter, providing scientific and feasible real-time monitoring and early warning data to support flight control and design optimization.

✦ Generated by Eureka AI based on patent content.

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Abstract

The application provides a coaxial dual-rotor helicopter and a rotor spacing measuring device thereof, and the device comprises a trigger acquisition system and a radar ranging module, the trigger acquisition system comprises a tool support 2, a photoelectric sensor 1 and a reflective grid 3, wherein: the photoelectric sensor 1 is installed around the rotor hub through the tool support 2 and is fixed by using two fixing bolts of an on-board lower rotor system fairing; the reflective grid 3 is installed outside a guide cylinder of a main reducer lower rotor automatic tilting device; and the photoelectric sensor 1 is connected with a transmitting / receiving 4 module through an analog signal line.
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