Aiming at the problems existing in the method of using sensors to detect the rotor position of marine main propulsion motor at low speed, a sensorless rotor position identification method based on high-frequency pulse vibration signal is proposed. In this method, the low-pass filter is used to separate the high-frequency signal component, and the current component of d-axis to q-axis is demodulated. The control mode of PI action law is used to phase-locked processing of the demodulated signal, in which purpose is to obtain the rotor position signal. The design method is simulated and verified by MATLAB/Simulink software. The error between the estimated position and the actual position of the rotor in the simulation waveform is small, and the accuracy is high. The simulation results show that this method can achieve good results when applied to the ship electric propulsion system without position sensor, which provides a theoretical reference for the design of marine main propulsion motor control system.
In order to analysis the impact of ship state on the navigational safety, the fuzzy comprehensive evaluation method based on fault tree of ship safety state is to be present in this paper. The fault tree of ship navigation state to be established using the software named Easydraw, after analyzing systematically influence factors of ship safety navigation, and the structure important degree of the basic event is calculated based on the fault tree, which made the main factors influencing the ship navigation safety clear.. With the analyzing results of the navigation state fault tree, several important factors such as speed, channel and visibility, to be regard as the main correlation factor evaluating ship safety state, and the mathematical model of fuzzy comprehensive evaluation on ship safety state to be established. The experiment is conducted in the YouShui river, the relevant parameters is obtained, using the GPS navigation system on board, and the navigation state is to be analyzed and evaluated by the mathematical model. The evaluation results shows that the evaluation model applied to the ship safety state is reliable and effective.
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