目的 针对可简化为带悬臂梁式易损件模型的产品包装系统，探究系统跌落破损评价方法。方法 建立带悬臂梁式易损件的产品包装系统的非线性跌落冲击动力学模型，利用模态叠加法，以易损件内部应力为评价指标，系统参数和冲击速度变化量为变量，构建杆式易损件包装系统跌落破损边界曲线。结果 实例分析表明，随着集中质量和主体振动频率增加，系统安全区域减小；易损件材料许用应力越大，系统安全性能越好。结论 对悬臂梁式易损件的非线性包装系统，集中质量大小和主体振动频率对系统跌落破损安全区域影响显著。

To study the dropping damage evaluating method of product packaging system with a cantilever beam critical part and provide theoretical directions for the packaging design of similar products. A nonlinear dropping shock dynamics model was established for the packaging system. Dropping damage boundary curve for the cantilever beam critical part was created by the modal superposition method with inner stress as evaluation indicator and system parameter and speed variation as variables. Example showed that the safety area of the system decreased as the concentrated mass and the frequency of main component increased. And the system safety performance would be better if the allowable stress was higher. In conclusion, for the nonlinear packaging system with a cantilever beam critical part, concentrated mass and frequency of main component have a significant impact on the dropping safety area.