Affiliations: [a] Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing, China
Correspondence:
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Corresponding author: Zequn Li, Faculty of Materials and Manufacturing, Beijing University of Technology, Beijing 100124, China. E-mail: lizequnjj@126.com, lzqjj@emails.bjut.edu.cn
Abstract: In this paper, a novel embedded double air gap electromagnetic hydraulic composite retarder (ED-EHR) is proposed. It has the advantage of high braking torque in the full-speed range compared with existing eddy current retarder, hydraulic retarder and electromagnetic hydraulic composite retarder (EHR) of the same size. However, the ED-EHR has the problem of mismatch between electric excitation and braking torque, i.e., the electric excitation is too large. In order to solve this problem, a multi-objective optimization design of the electromagnetic model (ED-EHR-E) of the ED-EHR is carried out with the objectives of minimum electrical excitation and maximum braking torque. Firstly, the working principle of the ED-EHR is introduced. Secondly, a multi-objective optimization method (FKNG-II) combining the full factorial design of experiment, the Kriging surrogate model (KSM), and the non-dominated sorting genetic algorithm II (NSGA-II) is established for the ED-EHR-E. Finally, the optimized the finite element analysis (FEA) results are compared with the FEA results and the experimental results of the initial design prototype. The results show that the optimized electrical excitation is reduced by about 29%, and the braking torque of the electromagnetic part is increased by 3%–16% in the full speed range. And the braking torque of the hydraulic part is increased by 10% by the optimization. In addition, the advantages of the ED-EHR are validated by comparison with the EHR.
Keywords: Electromagnetic-hydraulic composite retarder, multi-objective optimization, pareto front solutions, 3-D finite element method (3D-FEM), experiment
