紧急锁止式安全带卷收器带感锁止触发过程的运动学研究

Study on kinematics of triggering process on belt sense locking of emergency locking seatbelt retractor

对某型号紧急锁止式安全带卷收器的带感锁止触发进行了研究。在阐明安全带带感锁止机构工作原理的基础上,重点研究了带感锁止触发过程的运动学特性。针对非线性触发锁止特性,分别推导了带感锁止触发的接触力-加速度-时间及加速度-分离角度-时间的运动学方程。结合卷收器设计参数方程进行了数值求解,得到了锁止触发的两阶段运动学特性。研究结果表明:安全带锁止触发过程前期为匀加速运动,后期为非稳态加速运动。通过对前期运动学特征进行分析,验证了卷收器具备触发锁止功能的结构参数;结合后期的非稳态加速运动学计算,界定了卷收器在规定时间内触发锁止的最大分离角度。

Triggering process on belt sense locking of an emergency locking seatbelt retractor was studied in this paper. On the basis of expounding the working principle of seatbelt sense locking mechanism, kinematic properties on belt sense locking triggering process were mainly investigated. In view of nonlinear trigger locking characteristics, the kinetic equations of the contact force-accelerated speed-time and the accelerated speedseparation angle-time were derived respectively. Then the kinetic equation was solved by Matlab software with the design parameters of a retractor. The equation was solved numerically by combining the design parameters of the winder. As a result, the two-stage kinematic characteristic curve was obtained. The research results show that the earlier stage of the seatbelt locking triggering process is uniformly accelerated motion, while the later stage is unsteady acceleration. The structural parameters of the trigger locking function of the retractor were verified by analyzing the kinematic characteristics in the earlier stage. The maximum separation angle of the retractor trigger locking was defined in an allotted time by calculating the unsteady acceleration kinematics in the later stage.