磁流变限力安全带的设计原理

为了避免车用安全带在紧急锁止时对人体造成伤害，研究了一种可主动控制安全带约束力的磁流变限力器。介绍了限力器的控制原理和结构；运用磁饱和分析法探索了限力器阻尼力与外控电流的对应关系；根据人体胸部的安全承载能力，确立了限力器的限力极值,通过一算例验证了其可行性。该磁流变限力器与复合敏感式安全带锁止器配合,可实现智能控制且可以反复使用。

Design Principle of Magnetorheological Force Limited Seatbelt

An  active limiter for seatbelt constrain  force  with MRF was  proposed.This MRF force limiter was designed in order to avoid having a harmful effect on human body when seatbelt emergency locking.The control principles and structure for MRF force limiter  were  proposed.To research corresponding relationship between the limited  damping force and external control current the magnetic saturation analysis method was adopted.Limiting value of limiter  was set up according to chest load-carrying capability,and its feasibility was verified by a numerical example. The MRF  force  limiter  can be used with emergency locking retractor. It can realize intelligent control and  reuse.