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The controller, designed for fixed pitch electrically driven propellers, is based on a shaft speed control and employs an estimate of the propeller torque loss.
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The loss estimation problem is solved by designing a propeller load torque observer and by calculating an estimate of the torque loss factor based on an expected nominal load torque.
In this paper a nonlinear thrust controller for a fixed pitch marine propeller with torque loss estimation and an anti-spin strategy is presented.
Since this information not necessarily is available, a nonlinear adaptive observer for estimating the propeller load torque and the coefficient of friction is developed.
The measurements include propeller thrust, torque, rotation rate and advance speed as well as global forces and moments of a pod unit.
For highfidelity thruster control in extreme seas, estimates of the propeller load torque and losses due to waves, current, ventilation and in-and-out-of water effects are of high importance for detecting the loss incidents, optimizing the thrust production, minimizing the wear and tear of the propulsion system and limiting the power consumption.
The enlarged rudder was horn balanced and the vertical stabilizer was offset three degrees to port to counteract the four-bladed Rotol propeller's torque.
A simulation study is performed in order to compare the presented approach with the conventional shaft speed and torque propeller controllers.
Scale effects predicted on the pressure and friction components of propeller thrust and torque coefficients and duct thrust coefficients are compounded into a component-based scaling procedure using individual scaling functions.
Neglecting the rotational loss, the power absorbed by the propeller on a particular torque, T, can be expressed as [3] begin{aligned} P_text {p}=T times left( v+frac{Delta v}{2}right).
A propeller, or airscrew, converts the torque of an engine into thrust.
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