Monitoring system and method for loading of helicopter rotor and based on buried type optical fiber sensors

Abstract

The invention provides a monitoring system and method for loading of a helicopter rotor and based on buried type optical fiber sensors. The monitoring system comprises fiber bragg grating strain sensors, fiber bragg grating temperature sensors, a junction box, a fiber bragg grating interrogator, a data processing system and a strain loading decoupling system. According to the monitoring system andmethod for loading of the helicopter rotor and based on the buried type optical fiber sensors, engraved array gratings are buried in a composite material to perform online monitoring, a temperature compensation measure is adopted, and flapping loads and shimmy loads of the rotor are subjected to decoupling resolving; and the optical fiber sensors are high in the anti-electromagnetic-interferencecapacity, slightly influenced by the environment, good in sensitivity, high in measurement precision, used for sensing small signals and drawing an oscillograph, and high in practicability and reliability.

Description

technical field [0001] The invention belongs to the technical field of load monitoring of helicopter high-speed rotating rotors, and in particular relates to a helicopter rotor load monitoring system and method based on an embedded optical fiber sensor. Background technique [0002] The rotor system is the main source of lift and control force of the helicopter. During the flight, the rotor in the rotor system is always in the working state of alternating load due to the effect of aeroelastic coupling. The rotor dynamic load test has the characteristics of complex distribution, large measuring range, dense measuring points, sensitivity to additional mass, and high dynamic response; in a rotating and vibrating environment, a small unbalance will cause a large vibration of the rotor structure, accelerating bearings and shaft seals, etc. The aging of parts seriously affects flight safety. In order to improve the safety of the helicopter, it is necessary to monitor the alternat...

AI Technical Summary

Problems solved by technology

However, this method has many connecting wires, which affects the mechanical properties of the structure. At the same time, it has limitations such as short service life, long patch and calibration cycle, and inability to achieve continuous load measurement.

The existing fiber grating strain sensors mostly use surface-mounted sensors, which cannot meet the requirements for real-time monitoring of composite material structures, and are easily damaged by the influence of the external environment, which increases the time cost and economic cost.

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