| Citation: | ZHAO Wanli, GUO Yingqing, YANG Jing, et al. Design of liquid rocket engine fault diagnosis device and its HIL verification[J]. Journal of Beijing University of Aeronautics and Astronautics, 2019, 45(10): 1995-2002. doi: 10.13700/j.bh.1001-5965.2019.0044(in Chinese)
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In order to realize the real-time fault diagnosis of a liquid rocket engine onboard, a fault diagnosis device is designed by combining FPGA and DSP as the hardware architecture. The FPGA controls the high-precision A/D for sensor data acquisition, the DSP runs the fault diagnosis algorithm and outputs the result. The hardware and software of the fault diagnosis device were designed separately. A recursive structure identification (RESID) algorithm is proposed for liquid rocket engine fault diagnosis. The algorithm can diagnose traffic attenuation faults in 6 ms. Based on the hardware-in-the-loop (HIL) test platform of fault diagnosis and industrial computer, the algorithm was tested and verified by the combination of automatic code generation technology and handwritten code, and observed through the upper computer interface. The results show that the RESID algorithm can accurately diagnose the common faults of the engine and realize it on the fault diagnosis device. The running time of the algorithm is 3.9 ms. The fault diagnosis device can realize real-time data monitoring and fault diagnosis, which is more compact and economical than the traditional platform. It can be used both as an onboard device and as a general platform to develop new algorithms.
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