Online high-precision identification method for ship propeller thrust
[Objective]The weak deformation signal generated by propeller thrust on a shaft system is easily overshadowed by interfering noise,making it challenging to accurately measure the thrust.Therefore,this study proposes a new method for accurately measuring the thrust of propellers under low signal-to-noise ratio conditions.[Methods]By taking into consideration the influence of measurement data errors and the under-lying mechanical mechanisms,a thrust identification model is established based on a combination of Kalman filtering,and the thrust-displacement state equation.Thrust measurement research is conducted under three dif-ferent operating conditions:constant rotational speed,variable rotational speed and low-frequency fluctuating rotational speed.The precision and robustness of the proposed method are then analyzed under different signal-to-noise ratios.[Results]The results demonstrate that even at a signal-to-noise ratio of only 20 dB,the maxi-mum relative error in thrust identification is only 3.56%.Thus,the proposed method exhibits highly accurate and robust thrust identification performance under low signal-to-noise ratio conditions.[Conclusion]The findings of this study can provide valuable insights for the real-time and high-precision monitoring of pro-peller thrust and shaft system status in actual ship environments.
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