Cũng được biết đến, chất lỏng magnetorheological (MRF) là giàn treo hạt, mà có thể được từ hoá, và triển lãm nhanh, mạnh mẽ, và đảo ngược những thay đổi trong thuộc tính lưu biến của họ khi một từ trường được áp dụng. Do đó, ông chất lỏng giữ tiềm năng lớn trong nhiều ứng dụng đòi hỏi một giao diện điện cơ, chẳng hạn như khớp nối, Hệ thống phanh ô, Van, dampers và máy [1,2]. Đã có một số lớn các nghiên cứu về các ứng dụng của ông thiết bị trong ngành công nghiệp ô tô để thay thế hệ thống cơ khí truyền thống và một số người trong số họ được thương mại hóa như Van điều tiết của ông. Recently, there have been several researches on design of MR brake systems for automotive industry. Park et al. [3] have designed an automotive MR brake incorporated with a sliding mode controller to optimally control the wheel slip of a vehicle and the results were evaluated through simulation using Matlab simulink. More recently, Park et al. have performed multidisciplinary design optimization of an automotive MR brake [4]. In the research, the optimization problem was to find optimal values of a proposed objective function considering both braking torque and mass of the brake. Furthermore, the braking torque was constrained to be greater than the required value (1010Nm) while the mass was required to be smaller than that of an equivalent conventional hydraulic brake (CHB). However, some significant geometric dimensions such as the coil with and the gap size of MR fluid were not considered. Furthermore, the zero-applied field friction torque and the heat generated by this friction during the cruising of the vehicle were not accounted for the optimization. In addition, the braking torque was calculated based on Bingham model whose accuracy is lower at high shear rate than Herschel-Bulkley model. The computation time for the optimal solution in case of using first order optimization algorithm was 4 hours which was also a challenging issue in that research. Karakoc et al. [5] have performed the research on design considerations for an automotive MR brake. That research is an extension of the previous researches performed by Park et al. In the research, a multidisciplinary design optimization of an automotive MR brake was used and practical design criteria such as material selection, sealing, working surface area, viscous torque generation and MR fluid selection were considered. However, similarly to the research work by Park et al., some significant geometric dimensions were not considered as design variables, the zero-applied field friction torque and the heat generated by this friction during the cruising of the vehicle were not accounted for the optimization. Moreover, in the research, the braking torque was also calculated based on Bingham model. It has been surveyed that there is no research work on MR brake optimally designed by considering significant geometric dimensions, required braking torque and the heat caused by the zero-field friction during cruising of the vehicle.
đang được dịch, vui lòng đợi..