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Multi-objective optimal design of magnetorheological brakes for motorcycling application considering thermal effect in working process


Thang Le-Duc, Vinh Ho-Huu and Hung Nguyen-Quoc

Source title: 
Smart Materials and Structures, 27, 075060 (19pp), 2018 (ISI)
Academic year of acceptance: 

Magnetorheological brakes (MRBs) have great potential for replacing conventional hydraulic disc-type brakes in motorcycling applications because of some intelligent characteristics of magnetorheological fluids (MRFs). In the design of the MRBs, many influenced factors need to be investigated simultaneously; however, it is hard to consider them completely because of their trade-off benefits which affect significantly to the performance of MRBs. Thus, in this paper, a multi-objective optimization procedure that combines Elitist Non-dominated Sorting Genetic Algorithm (NSGA-II), a robust multi-objective optimization method combined with finite element analysis (FEA) is proposed for evaluating the interactive relations of different design objectives. In detail, the above approach focuses on obtaining the Pareto optimal solutions with two common objectives in design MRBs: maximizing the braking torque and minimizing the brake mass. On the other hands, the rigorous heating effects acting on MRBs restrict their capacity in motorcycling applications. Therefore, a thermal analysis model for off-state and on-state conditions of MRBs is also proposed in this study and the temperature of MRF in the brakes is constrained lower than a critical value in the multi-objective optimal design. Based on the proposed procedure, the Pareto set of MRBs and relative solutions are achieved and some trade-offs between the two goals are investigated with some further explanations. Moreover, the comparisons among investigated MRBs including the conventional and the side-coil MRBs with various shapes of housings are debated and some discussions on the performance of optimal MRBs are described to help designers for decision making.