Method and device for measuring the thrust of a ship propeller axis

Abstract

The application discloses a kind of ship propeller axis thrust measurement methods. Obtain two strain gauge readings ε1,ε2 and two laser sensor readings d1,d2;According to strain gauge readings ε1,ε2, propeller thrust F T First relationship formula;According to laser sensor readings d1,d2, propeller thrust F T Second relationship formula;Derivation is carried out to first relationship formula and second relationship formula respectively, and discrete according to time step;After conversion, the discrete relationship formula is converted into Kalman filter state transition equation, and Kalman filter observation equation is constructed;Kalman filtering is carried out based on state transition equation and observation equation, and the propeller axis thrust value after noise reduction is obtained.The application utilizes strain gauge to measure the strain of shafting under thrust, and utilizes laser displacement sensor to measure the deformation displacement of rotating shaft, and the measured strain and displacement data are fused by Kalman filtering processing, so that the measurement noise and the thermal deformation interference caused by environmental temperature can be effectively filtered out, the data processing precision is improved, and the ship propeller thrust can be measured on line and in real time.

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