目的 研究二自由度正切型系统的动态特性，为缓冲包装设计提供理论依据。 方法 建立一类正切非线性缓冲系统二自由度振子模型， 采用数值仿真手段讨论质量比、频率比、易损件阻尼、缓冲材料阻尼等对振子变形响应的影响规律。 结果 质量比和频率比对最大变形影响非常小， 缓冲材料阻尼对最大变形的影响最显著， 是控制材料变形的主要因素。 结论 通过改变缓冲材料的阻尼来控制缓冲垫的变形，完成相应的缓冲包装设计。

Objective To provide a theoretical basis for the design of cushioning packaging, the dynamic characteristics of two-degree-of-freedom tangent system was studied. Methods A two-degree-of-freedom vibration system was proposed to model the shock response of a class of tangent cushioning system. The effect rules of the mass ratio, the frequency ratio, the damping ratio of joint and the cushion on the maximum response displacement of cushion were studied. Results The results showed that the damping ratio of cushion was the key factor in controlling material deformation due to its noticeable influence on the response, and the effects of mass and frequency ratio were very little. Conclusion Deformation of the buffer pad could be controlled through changing the damping of the buffer material to complete the corresponding cushioning packaging design.