Research on wingtip distance measurement of high-speed coaxial helicopter based on 77 GHz FMCW millimeter-wave radar

Zhang, Zhiyuan Zhi; Qiu, Zurong; Hu, Wenchuan; Lu, Yaohuan; Zheng, Wei Xing

doi:10.1088/1361-6501/acc5fd

Cited by 1 publication

(1 citation statement)

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“…Due to the discrete distribution of fibre optic sensors, the installation angle has a great influence on the calculation result, and the decoupling of strain is difficult [ 10 ]. Research on electromagnetic ranging based on FMCW millimetre-wave radar is ongoing [ 11 ]; however, it can be difficult to receive adequate echo signal from small-sized rotor blades, e.g., chord length in tens centimetres, during dynamic measurement. Electromagnetic ranging also suffers from low resolution, e.g., 37.5 mm in resolution with the commonly used electromagnetic bandwidth of 5 GHz [ 12 ], as well as the risk of electromagnetic interference.…”

Section: Introductionmentioning

confidence: 99%

Distance Measurement of Contra-Rotating Rotor Blades with Ultrasonic Transducers

Zhang,

Lu,

Qiu

et al. 2024

Micromachines

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Coaxial rotor helicopters have great potential in civilian and commercial uses, with many advantages, but challenges remain in the accurate measurement of rotor blades’ distance to prevent blade collision. In this paper, a blade tip distance measurement method based on ultrasonic measurement window and phase triggering is proposed, and the triggering time of the transmitter is studied. Due to the complexity of the measured signal, bandpass filtering and a time-of-flight (TOF) estimation based on the power density of the received signal are utilised. The method is tested on an experimental test platform with a pair of 200 kHz ultrasonic transducers. The experimental results show that the maximum ranging error is less than 1.0% for the blade tip distance in a range of 100–1000 mm. Compared with the amplitude threshold method, the proposed TOF estimation method works well on the received signal with a low SNR and improves the ranging accuracy by about 5 mm when the blade tip distance is larger than 500 mm. This study provides a good reference for the accurate measurement of rotor blade tip distance, and gives a solution for ranging high-speed rotating objects.

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Section: Introductionmentioning

confidence: 99%