防下潜分析的有限元建模方法研究

Research on the Method of FE Modeling in Anti-Submarining Analysis

为提升防下潜仿真分析的精度,从建模的角度对仿真分析方法进行了探讨,对安全带的两种建模方式进行了对比分析。结果表明,普通的混合式建模方法在防下潜分析中具有一定的局限性,全二维壳单元的安全带建模方法能够避免仿真分析中的假性自锁,提升仿真的可靠性。同时,对正面碰撞中车体转动趋势对假人下潜的影响进行了分析,从下潜工况中假人的受力与转动的关系上论述了通用滑台试验对下潜现象模拟的局限性,表明车体转动效应增加了假人相对车体的转动,从而加剧下潜的发生,在仿真中应考虑车体的转动对防下潜分析的影响。

In order to improve the precision of anti-submarining simulation, simulation methods are discussed from the modeling perspective. Two methods of seatbelt modeling are compared and analyzed. The results show that conventional hybrid modeling method has some limitation in the anti-submarining analysis, whereas 2 D seatbelt modeling method is able to avoid faking self-locking in simulation, improving reliability of simulation. Then, the influence of vehicle rotation trend on the dummy’s submarining during frontal crash is compared and analyzed. From the relationship of dummy force and vehicle rotation, the limitation of simulation of conventional sled test in the submarining is discussed. The results show that vehicle rotation effect increases dummy’s rotation relative to vehicle, there for increasing chance of submarining. It is necessary to consider vehicle rotation in the anti-submarining analysis in simulation.