关键词: 小偏置碰撞；侧滑运动；三自由度二阶分段模型；软件实现；MATLAB

Abstract: In automotive collision accidents, frontal small-offset collisions account for a high proportion and result in severe casualties. The core issue lies in the limited contact area between the front crumple zone and the barrier, making it difficult to absorb collision energy and leaving the passenger compartment vulnerable to impact. A skid motion strategy that guides the vehicle to deviate laterally from the barrier can effectively reduce impact loads by minimizing direct contact between the passenger compartment and the barrier. Based on the China-insurance automotive safety index (C-IASI), this paper proposes a skid motion evaluation method centered on kinematic response skid values and vehicle yaw angle as core metrics, providing theoretical support for refining China's automotive safety regulations. Building upon this, a three-degree-of-freedom second-order segmented motion model is constructed, dividing complex collision processes into multiple segments of uniformly accelerated motion. This approach reduces computational complexity while maintaining prediction accuracy. Additionally, interactive planning software developed in MATLAB enables parameter input, real-time computation, and result visualization, providing a powerful tool for automotive safety design.

Key words: small overlap collision; skid motion; three-degree-of-freedom second-order segmented model; software implementation; MATLAB