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This paper presents the development of a magnetoelastic torque-meter for use on the Landing Craft Air Cushion (LCAC) hovercraft’s high speed gas turbine engines. As the gas turbine can produce in excess of the nominal torque limit of the right angle gearbox, torque limiting is required. Limiting torque based on torque tables (as is done currently) penalizes the overall performance of the majority of the fleet due to a significant variance in engine output horsepower. This sub-optimal operation of the craft could be overcome by measuring actual torque produced by each engine with a torque-meter; however conventional torque-meter designs were deemed impractical to retrofit due to the design requirements, and issues with integration and reliability / maintainability. An in-depth search by the US Navy identified a torque-meter concept utilizing magnetoelastic polarized band technology. The aim of this paper is to: (i) outline the general architecture of the system, (ii) highlight the performance of the torque-meter developed for the LCAC, (iii) describe the efforts that helped to mature this technology to Technology Readiness Level 8 and to transition it from motorsport applications to use on the LCAC, and (iv) summarize the initial results of the torque-meter system validation obtained through dynamometer tests on the engine and craft tests on the LCAC.
Published data un the yield strength of steels and other materials i s typically limited to vi~lues determined from riniiixilxiol rensio,r tests. The lorsiorrol yield strength (rJ. required for the rational design of shafts (mechanical clcmcnts having ii ubiquitous prcscncc in modcrn mxhincry) i s generally assumed to be 0.5 -0.6 of the tensile value, baed an one or another o f the several thcorics of plasticity [I]. Morc prccix knowlcdge or T? for B sclectcd ahaft matcrial and thc effects on I, of various thensalhnechanical treatnEnIs w c h as ~nultiplc tempering. shot pccning. etc.. will enable design optimization to meet safety, weight. economic, or other goals. These are impurtant. often critical considerations, especially in the aerospace and automotive industries.
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