易损件在连续跌落冲击载荷作用下的动力学响应

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摘要产品在运输途中常发生多次跌落的情况，为研究具有易损件的产品在连续跌落冲击载荷作用下的动力学响应，基于发泡聚乙烯(expanded polyethylene, EPE)在加载-卸载循环条件下的本构关系，对易损件-产品-泡沫缓冲系统进行了动力学分析。基于发泡聚乙烯在加载-卸载循环条件下的本构关系，建立了具有易损件的产品包装动力学模型；对比了在连续多次冲击下系统的加速度响应，分析了多次冲击对EPE缓冲性能造成的影响；对比了不同频率下的系统冲击谱，研究了多次冲击下易损件加速度与频率的关系。研究结果表明：EPE缓冲材料在多次冲击下缓冲性能明显降低；系统在特定频率下会发生共振，导致易损件响应增大，这个特定频率会随着跌落次数的增多而增大。算例表明：在进行缓冲设计时，结合不同厚度的EPE缓冲衬垫在多次连续冲击下的易损件加速度-衬垫面积关系曲线，根据给定条件可以确定更合适的衬垫尺寸，可以防止过度包装。

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	伍瑾1
	卢富德1
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	滑广军1
	高德2

关键词 ：易损件, 聚乙烯泡沫, 动力学分析, 连续冲击

Abstract：In order to study the dynamic response of products with vulnerable part under continuous drop impact load, the dynamic analysis of the vulnerable part-product-foam buffer system was carried out based on the constitutive relationship of expanded polyethylene under the loading - unloading cycle. Based on the constitutive relation of expanded polyethylene under loading and unloading cycle, the packaging dynamics model of products with vulnerable part was established. The acceleration response of the system under multiple shocks is compared, and the influence of multiple shocks on the buffering performance of EPE is analyzed. The relationship between the acceleration and frequency of vulnerable part under multiple shocks is studied by comparing the system impact spectra at different frequencies. The results show that the buffering performance of EPE material decreases obviously under multiple shocks. The system will resonate at a specific frequency, resulting in an increased response of vulnerable part. This specific frequency will increase with the increase of the number of drops. The example shows that, in the buffer design, a more appropriate gasket size can be determined according to the given conditions by combining the acceleration-gasket area relation curve of EPE buffer gaskets of different thicknesses under multiple continuous impacts, which can prevent excessive packaging.

Key words： vulnerable part expanded polyethylene dynamic analysis continuous impact

收稿日期: 2023-01-15 出版日期: 2023-10-28

引用本文:

伍瑾1，卢富德1，王彪1，滑广军1，高德2. 易损件在连续跌落冲击载荷作用下的动力学响应[J]. 振动与冲击, 2023, 42(20): 275-279.
WU Jin1, LU Fude1, WANG Biao1, HUA Guangjun1, GAO De2. Dynamic response of vulnerable part under the continuous drop impact loads. JOURNAL OF VIBRATION AND SHOCK, 2023, 42(20): 275-279.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2023/V42/I20/275

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