The occupant retention and injuries under far-side impact are invariably dependent upon the effectiveness of the seatbelt restraint system, which is largely driven by parameters such as seatbelt pre-tensioner limiting load, D-ring position above and behind the shoulder, and friction coefficient between the torso and the seatbelt. The cumulative effect of systematic variation of these parameters on occupant kinematics under far-side is rarely studied in the literature. In this study, a systematic and detailed analysis was performed to understand the effect of these parameters on occupant retention. A rigid buck assembly with Global Human Body Model Consortium Human Body Model, validated with post mortem human surrogate experiments was used under two different impact scenarios—lateral and oblique. A simulation matrix of 16 cases was designed by varying the magnitude of the parameters for each impact scenario. Each case was graded as good, moderate, or poor retention based on the position of the shoulder seatbelt at the time of rebound. Head accelerations and excursions, chest compression, rib fractures, and neck moments of the HBM were analyzed to understand the effect of improved retention on occupant kinematics. Results showed that higher pre-tensioner limiting load, higher seatbelt friction, and backward position of D-ring improved retention in both lateral and oblique scenarios. Head acceleration, and excursions and chest compression decreased from poor retention cases to good retention cases for both impact scenarios. Rib fractures were higher in cases with poor retention as compared to those with good retention. The peak lateral neck moments changed marginally from poor to good retention; however, the rate of loading of the neck was significantly higher in good retention. Thus, the current study suggested that the backward D-ring position coupled with higher pretensioner limiting load and friction is likely to improve retention in far-side impacts and prevent injuries from the occupant slipping out of the restraint system. Better retention reduced occupant acceleration, excursion, chest compression and number of rib fractures, on the contrary it might instill higher injury vulnerability to neck and brain.

安全带约束系统的有效性始终取决于安全带约束系统的有效性，安全带约束系统的有效性在很大程度上取决于安全带预紧器的极限载荷，肩膀上方和后面的D形环位置以及摩擦系数在躯干和安全带之间。这些参数的系统性变化对远方乘员运动学的累积影响很少在文献中进行研究。在这项研究中，进行了系统和详细的分析，以了解这些参数对乘员保留的影响。在两个不同的碰撞场景（横向和倾斜）下，使用了具有全球人体模型协会人体模型的刚性降压组件，该组件已通过事后人体替代实验进行了验证。通过改变每种影响情景的参数大小，设计了16个案例的模拟矩阵。根据反弹时肩部安全带的位置，将每种情况的保持力分为好，中等或差。分析了HBM的头部加速和短途运动，胸部压迫，肋骨骨折和颈部力矩，以了解保持力改善对乘员运动的影响。结果表明，较高的预紧器极限载荷，较高的安全带摩擦力和D形环的向后位置可改善在横向和倾斜情况下的保持力。在两种撞击情况下，头部加速，短途旅行和胸部按压均从不良的保持情况降至良好的保持情况。与保留良好的患者相比，保留不良的患者肋骨骨折的发生率更高。颈部最大侧向力矩从差的保持力变为良好的保持力；然而，在保持良好状态下，颈部的负载率明显更高。因此，当前的研究表明，向后的D形环位置加上较高的预紧器限制载荷和摩擦力可能会改善在远侧碰撞中的保持力，并防止乘员滑出约束系统而造成伤害。更好的保持力可以减少乘员的加速，移动，胸部受压和肋骨骨折的数量，相反，它可能会给颈部和大脑带来更高的伤害脆弱性。当前的研究表明，向后的D形环位置加上较高的预紧器限制载荷和摩擦力可能会改善在远侧碰撞中的保持力，并防止乘员滑出约束系统而造成伤害。更好的保持力可以减少乘员的加速，移动，胸部受压和肋骨骨折的数量，相反，它可能会给颈部和大脑带来更高的伤害脆弱性。当前的研究表明，向后的D形环位置加上较高的预紧器限制载荷和摩擦力可能会改善在远侧碰撞中的保持力，并防止乘员滑出约束系统而造成伤害。更好的保持力可以减少乘员的加速，移动，胸部受压和肋骨骨折的数量，相反，它可能会给颈部和大脑带来更高的伤害脆弱性。