Wavelet analysis to decompose a vibration simulation signal to improve pre-distribution testing of packaging
Wavelet analysis to decompose a vibration simulation signal to improve pre-distribution testing of packaging
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DOI：
10.1016/j.ymssp.2015.12.035
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发表时间：
2016-08-01
影响因子：
8.4
通讯作者：
Shires, D.
中科院分区：
文献类型：
--
作者：
Griffiths, K. R.;Hicks, B. J.;Shires, D.
一般情况下，车辆振动是非平稳的，具有非高斯概率分布；然而，现有的包装设计测试方法采用高斯分布来表示道路轮廓引起的振动。这经常导致过度测试和/或过度设计包装以满足规格，并相应地导致浪费包装和产品浪费，这在美国每年代表150亿美元，在英国每年代表30亿美元。本文的目的是使测量的非平稳加速信号被构建的信号所取代，该信号尽可能包括原始信号的任何非平稳特征。构造的信号由分解后的短持续时间信号串接而成，每个信号都有自己的峰度电平。采用小波分析将信号分解为内部和离群信号分量。构建的信号具有与原始信号相似的PSD，而不会产生过多的加速水平。这允许一个改进的和更具代表性的模拟输入信号产生，可用于当前一代激振台。通过两个相关研究，对小波分解方法进行了实验验证。这表明，显著改进目前的国际标准包装测试是可以实现的；因此，更有效的包装系统设计的潜力是可能的。(C) 2016年作者。Elsevier Ltd.出版。
In general, vehicle vibration is non-stationary and has a non-Gaussian probability distribution; yet existing testing methods for packaging design employ Gaussian distributions to represent vibration induced by road profiles. This frequently results in over testing and/or over-design of the packaging to meet a specification and correspondingly leads to wasteful packaging and product waste, which represent $15bn per year in the USA and (sic)3bn per year in the ELL The purpose of the paper is to enable a measured non stationary acceleration signal to be replaced by a constructed signal that includes as far as possible any non-stationary characteristics from the original signal. The constructed signal consists of a concatenation of decomposed shorter duration signals, each having its own kurtosis level. Wavelet analysis is used for the decomposition process into inner and outlier signal components. The constructed signal has a similar PSD to the original signal, without incurring excessive acceleration levels. This allows an improved and more representative simulated input signal to be generated that can be used on the current generation of shaker tables. The wavelet decomposition method is also demonstrated experimentally through two correlation studies. It is shown that significant improvements over current international standards for packaging testing are achievable; hence the potential for more efficient packaging system design is possible. (C) 2016 The Authors. Published by Elsevier Ltd.