A Lag Angle Test Method for Actuators of Spinning Missiles Based on Improved SOGI-FLL

doi:10.12382/bgxb.2021.0563

Abstract

Abstract:

To address the problems of noise and DC offset in testing the lag angle of actuators of spinning missiles, an improved second-order generalized integrator frequency-locked loop (SOGI-FLL) algorithm is applied for processing test data and accurately calculating the lag angle. The essence of the test is to extract the phase of sinusoidal signals under the influence of noise and DC offset. By introducing the DC offset compensation loop into conventional SOGI-FLL, the algorithm is capable of suppressing DC offset disturbances. The improved SOGI-FLL shows the characteristics of a band-pass filter, which can realize filtering without lag and attenuation at the fundamental frequency of sinusoidal signal, effectively eliminating the influence of noise and DC offset. In the meantime, the output quadrature signals are supplied to phase locked loop (PLL) with PI controller for phase angle estimation. The simulation and experimental results show that the improved SOGI-FLL can effectively improve the lag angle processing accuracy compared with the traditional FFT method and correlation analysis method when the test signal is affected by noise and DC offset.

Key words: actuator of spinning missile, second-order generalized integrator frequency-locked loops, phase-locked loop with PI controller, lag angle

CLC Number:

TP211

ZHANG Xin, LIN Fan, SHEN Xinjie. A Lag Angle Test Method for Actuators of Spinning Missiles Based on Improved SOGI-FLL[J]. Acta Armamentarii, 2023, 44(2): 428-436.

Figures/Tables 16

Fig.1 Actuator angles

Fig.2 Structure of the improved SOGI-FLL

Fig.3 Bode plot of the transfer functions D(s), Q(s), Dm(s) and Qm(s)

Fig.4 Bode plot of the transfer functions Dm(s) and Qm(s) with different values of kdc

Fig.5 PLL structure

Fig.6 Estimation of lag angle and amplitude

Fig.7 δ c z 1(t) and δ f z 1(t) in simulations

Fig.8 ê' and qê' simulation results

Fig.9 Estimation results of lag angle and amplitude

Table 1 Simulation results

处理项目	处理方法
处理项目	改进SOGI-FLL	FFT	理论结果
幅值衰减因子	0.949	0.947	0.950
相位滞后/rad	0.1003	0.1011	0.1000

Fig.10 FFT simulation results

Fig.11 Experimental curves

Fig.12 Experimental curves of the section with constant speed

Fig.13 Amplitude and lag angle results in turntable experiment

Table 2 Experimental results

处理项目	处理方法
处理项目	改进SOGI-FLL	FFT	相关分析
1通道幅值衰减因子	0.999	0.934	0.999
1通道相位滞后/rad	0.1243	0.1266	0.1313

Fig.14 FFT experimental results

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