Multi-objective Optimization Design of AC-excited Linear Rail Eddy Current Brakes
The linear track eddy current braking technology has the advantages of stable braking force and no friction,and can maintain stable braking force output on complex lines such as continuous long ramps,which is a powerful supplement to the braking system of high-speed trains.To improve the braking performance of eddy current brakes,multi-objective optimization of linear track eddy current brake was carried out in this paper.An analytical computational model for AC-excited linear rail eddy current brakes based on hierarchi-cal modeling was established,and the correctness of the analytical model was verified by the finite element model and experimental method.Meanwhile,the braking characteristics was analyzed preliminarily.Multi-objective optimization design for several key structural parameters affecting braking force was carried out based on NSGA-II optimization algorithm.The optimization results show that the maximum braking force of the optimized eddy current brake is increased by 30.8%and the critical speed value is increased by 8.5%.The braking performance of AC excited linear track eddy current brake is improved,and the applicable speed range of the brake is widened,which lays a theoretical foundation for the optimal design and applica-tion of AC excited linear track eddy current brake.
eddy current brakefinite element modelmulti-objective optimization
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