Zhang Honglin, Wang Zefeng, Teng Fei, Xia Pinqi
Institute of Flight Test Technology, Chinese Flight Test Establishment, Xi'an 710089, China.
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China.
Sensors (Basel). 2023 Jul 26;23(15):6692. doi: 10.3390/s23156692.
Fiber Bragg grating (FBG) sensor has a lot of advantages over the resistance strain gauge and has been used in many applications. However, there are few applications of rotor blade dynamic measurement in helicopter flight. In this paper, a method for blade dynamic strain measurement using an FBG sensor in a helicopter's real flight is presented. The corresponding measurement system is established and can eliminate the effects of the helicopter's electromagnetic environment on the electrical sensing components in the measurement system with the orthogonal frequency-division multiplexing modulation. The measured dynamic strains on the rotor blades of the helicopter in real flight contain six harmonic frequencies with the vibration characteristics of rotor blades, indicating that the established FBG measurement method and system have practical engineering applications.
光纤布拉格光栅（FBG）传感器相对于电阻应变片具有诸多优势，已在许多应用中得到使用。然而，在直升机飞行中，旋翼叶片动态测量的应用却很少。本文提出了一种在直升机实际飞行中使用FBG传感器进行叶片动态应变测量的方法。建立了相应的测量系统，该系统可通过正交频分复用调制消除直升机电磁环境对测量系统中电气传感元件的影响。直升机实际飞行中旋翼叶片上测得的动态应变包含六个具有旋翼叶片振动特性的谐波频率，这表明所建立的FBG测量方法和系统具有实际工程应用价值。
