Abstract: To achieve accurate prediction of the fatigue life of torsion beam structures, this paper proposes a simulation analysis method based on the virtual iteration technique. First, a multi-body dynamic model is built in Adams, and the dynamic load spectra of key attachment points are extracted through virtual iteration. Then, the HyperMesh software and Nastran solver are used to calculate the stress distribution and stress influence coefficients of the torsion beam under unit loads. Finally, the linear superposition method is adopted in NCode software to synthesize the dynamic load spectra with the stress influence coefficients for fatigue life calculation. The analysis results show that the fatigue life distribution obtained by this method is highly consistent with the results of real vehicle road tests, which verifies the good effectiveness and engineering application value of the virtual iteration technique in the durability analysis of torsion beams.

Key words: virtual iteration; fatigue life; load extraction; NCode; torsion beam

摘要： 为实现扭力梁结构疲劳寿命的精准预测，文章提出一种基于虚拟迭代技术的仿真分析 方法。首先在 Adams 中构建多体动力学模型，通过虚拟迭代提取关键接附点的动态载荷谱； 继而利用 HyperMesh 软件与 Nastran 求解器，计算扭力梁在单位载荷下的应力分布及应力影 响系数；最后在 NCode 软件中采用线性叠加法，将动态载荷与应力影响系数进行合成，完成 疲劳寿命计算。分析结果显示，该方法所得疲劳寿命分布与实车路试结果高度吻合，验证了 虚拟迭代技术在扭力梁耐久性分析中具备良好的有效性与工程应用价值。

关键词: 虚拟迭代；疲劳寿命；载荷提取；NCode；扭力梁