Abstract
AbstractWe describe an engineering solution to manufacture electromagnetic linear actuators for moving rudders and fin stabilizers of military shipsItalian Ministry of Defence, General Direction of Naval Equipments (NAVARM), Projects ISO (2012-2014) and EDDA (2015-2017).. The solution defines the transition from the conceptual design of the device initially studied from an electromagnetic point of view to mechanical configurations that really work. The structural problems that have been resolved with the proposed configuration are described. In order to validate the design choices discussed we illustrate some results of the numerical simulations performed by the structural finite elements method. These results quantitatively justify the suggested mechanical solution by evaluating stresses and deformations in a virtual prototype of the structure during its functioning. The parts of the device that have been studied are the most critical because in cases of excessive deformation/stress, they can irreparably compromise the actuator operation. These parts are the pole piece-base set and the retention cages of the permanent magnets. The FEM analysis has allowed us to identify the most stressed areas of the previous elements whose shape has been appropriately designed so as to reduce the maximum stresses and deformations. Moreover, the FEM analysis helped to find the most convenient solution to join the pole pieces to the respective bases. The good results obtained by the suggested engineering solution have been experimentally confirmed by tests on a small prototype actuator purposely manufactured. Finally, a qualitative analysis of the engineering problems that have to be considered to design electromagnetic linear actuators bigger than the one already manufactured is illustrated.
Highlights
We describe an engineering solution to manufacture electromagnetic linear actuators for moving rudders and fin stabilizers of military ships1
In the following paragraphs we describe the Finite Element Method (FEM) analyses performed with reference to the three kinds of base-pole piece joints previously mentioned
With regard to the retention cages, in relation to the high strength aluminum alloy that has been chosen to manufacture them, the FEM analyses indicate that stresses and deformations are acceptable, even if the permanent magnets lose their magnetization
Summary
Abstract: We describe an engineering solution to manufacture electromagnetic linear actuators for moving rudders and fin stabilizers of military ships. Experimental tests were carried out by manufacturing an electromagnetic actuator prototype that can apply a horizontal thrust greater than 3 tons on the steel plate (2) (see Figure 2) [11] Another problem that has been studied to develop this kind of actuator concerns the reliability of operation. In this respect, simulations and tests [12] were performed in relation to the possible malfunction of a single module consisting of the polar expansions (4), the electrical windings (5) and the base (8) (see Figure 2). In order to manufacture a first working prototype of the device, it has been necessary to study care-
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