正撞工况下动态锁舌性能研究和优化方案

Performance Research and Optimization Schemes of Dynamic Locking Tongue in Frontal Crash

本文中对正撞工况下动态锁舌对假人伤害值的影响和单品性能的优化方案进行研究。首先从动态锁舌结构和假人胸部受力模型进行其工作原理的理论研究;接着结合台车试验,进一步明确动态锁舌对安全带力和假人胸压量的影响,发现动态锁舌可通过降低B4处肩带力来有效地减小假人的胸压量,改善胸部伤害值。最后通过LS-DYNA仿真,定性分析了两个动态锁舌单品的优化方案。结果表明:缩短响应时间、提高锁止保持力,能有效提升动态锁舌的约束性能,获得更小的胸压量。

The effects of dynamic locking tongue(DLT)on dummy injury and the optimization scheme of its single product performance are studied in this paper.Firstly the theorecical study on the working principle of DLT in terms of its structure and the model for the forces acting on dummy chest.Then the effects of DLT on belt force and dummy chest deflection are futher determined by sled experiment,and it is found that with DLT the dummy chest deflection can be effectively reduced by lowering the belt force at shoulder section B4,hence improving chest injury.Finally two optimization schemes for DLT single product are qualitatively analyzed by LS-DYNA simulation with a result showing that shortening response time and increasing locking retention force can effectively enhance the restraint performance of DLT,resulting in smaller dummy chest deflection.