红外镜头跌落冲击仿真及缓冲包装方法选择研究

Dropping simulation and selecting of cushion packaging methods for a infrared lens

基于显式动力分析理论,对某款红外镜头及其包装件进行跌落仿真分析,提取镜头整体,大、小镜片在每个时刻的最大应力,在MATLAB中生成曲线,得出在初始时刻,大镜片上的应力大于小镜片上的,而在结束阶段,情况相反,从而引发了设计者对镜片安装处镜筒的壁厚设计的思考;以硬质PU泡沫作为此类红外镜头的缓冲包装,在保护产品抵抗冲击方面,采用局部缓冲优于全面缓冲。并将局部缓冲下大、小镜片中心点Z向加速度峰值与裸机的作比较,发现该缓冲方法对峰值的削弱效果非常明显。最后将局部缓冲包装件放入瓦楞纸箱进行跌落试验,且能通过。这种基于仿真的设计方法为红外产品结构设计及缓冲包装方法的选择提供了一种有效的研究手段。

The dropping process of a infrared lens and its package were analyzed based on the explicit dynamic analysis theory here,the maximum stresses of the infrared lens,its large lens and small lens were extracted at each instant.Then the stress versus time curve was generated in MATLAB.The stress of its large lens was higher than that of its small lens at the initial instant and in the ending stage the situation is opposite,so it caused the designer＇s thinking for the thickness design of the barrel.Rigid polyurethane foam was taken as the cushioning packaging of this infrared lens. Partial cushion packaging was better than comprehensive cushion packaging for protecting the product from shock. Compared with the bare machine drops,it was shown that the Z direction acceleration response of the central point of the large and small lenses with the partial cushion packaging during drop is much lower than that of the bare lense.Finally, the lens with the partial cushion packaging was put into a corrugated box for a drop test,and it passed through the test. This simulation-based design approach provided an effective means for the structural design of infrared products and selection of cushioning packaging methods.