不同谱型激励下包装件动态响应研究

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摘要

根据正弦扫频振动试验结果设置共振频率区域谱型相同、非共振频率区域谱型不同的两种加速度随机振动功率谱（PSD）激励。研究了非线性包装系统在3种约束、3种振动等级下，上述两种谱型激励对产品加速度响应和包装件动压力响应的影响。研究结果表明：相同约束和激励等级条件下，两种激励谱在激励相同的区域产品加速度响应PSD基本一致，包装件动压力响应PSD也基本一致；当振动强度较高时，由于阻尼影响，共振点附近小范围内两种谱型激励的响应存在一定偏差；两种谱型激励的加速度响应概率密度分布大致相同，且加速度响应的均值、均方差、偏度和峭度均比较接近；两种谱型激励下动压力峰值分布存在一定差异，谱型1的动压力峰值分布更窄、更高，但两种谱型激励下动压力响应的均值、均方差、均值穿越次数、峰值数和带宽系数均比较接近；共振区域的激励控制了整个非线性包装系统的响应。

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	王志伟1
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	房树盖1
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关键词 ：谱型, 功率谱（PSD）, 概率密度（PDF）, 动压力, 峰值分布

Abstract：Two types of acceleration random vibration power spectral density (PSD) excitations were set up according to the results of sine sweep vibration experiments, which had the same spectrum in the vicinity of the resonance frequency and different spectrum in the vicinity of the non-resonance frequency.The acceleration responses of product and dynamic contact force responses of packaged product were investigated with three kinds of constraints and input intensities for the nonlinear packaging system.The results indicate that under the same constraint and vibration intensity condition, the acceleration response PSDs of product and dynamic contact force response PSDs of package were basically consistent around the resonance frequencies; when the vibration intensity was higher, the acceleration response PSD of product and dynamic contact force response PSD of package under the two types of spectral excitations had a certain deviation in the small range of the resonance point due to the influence of the damping; the probability density function (PDF) of acceleration responses almost showed no difference under the different spectral excitations, and the values of mean, standard deviation, skewness and kurtosis were close; there were some differences between the PDF of the peak of dynamic contact force, and the distributions in the spectrum 1 were narrower and higher than that in the spectrum 2; however, the values of mean and standard deviation, number of mean value crossings and number of maxima of dynamic contact force, and bandwidth coefficient were close.Excitation of resonant region controls the responses of the whole nonlinear packaging system.

Key words： spectrum power spectral density(PSD) probability density function(PDF) dynamic contact force peak distribution

收稿日期: 2018-04-09 出版日期: 2019-12-15

引用本文:

王志伟1,2,3，房树盖1,2,3. 不同谱型激励下包装件动态响应研究[J]. 振动与冲击, 2019, 38(24): 218-226.
WANG Zhiwei1,2,3, FANG Shugai1,2,3. A study on dynamic responses properties of packaged products under different spectral excitation. JOURNAL OF VIBRATION AND SHOCK, 2019, 38(24): 218-226.

链接本文:

http://jvs.sjtu.edu.cn/CN/ 或 http://jvs.sjtu.edu.cn/CN/Y2019/V38/I24/218

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