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机械工程学报

机械工程学报 ›› 2017, Vol. 53 ›› Issue (3): 90-99.doi: 10.3901/JME.2017.03.090

• 机械动力学 • 上一篇    下一篇

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两层计算机堆码包装动力学试验研究*

王志伟1，2，3, 戚德彬1，2，3   

  1. 1. 暨南大学包装工程研究所 珠海 519070;
    2. 暨南大学产品包装与物流广东普通高校重点实验室 珠海 519070;
    3. 暨南大学珠海市产品包装与物流重点实验室 珠海 519070
  • 出版日期:2017-02-05 发布日期:2017-02-05
  • 作者简介:

    作者简介：王志伟(通信作者)，男，1963年出生，博士，教授，博士研究生导师。主要研究方向为包装工程、机械设计及理论和复合材料与结构。

    E-mail：wangzw@jnu.edu.cn

  • 基金资助:
    * 国家自然科学基金(50775100)和珠海市重点学科、重点实验室资助项目; 20160613收到初稿，20161124收到修改稿;

Experimental Study of Dynamic Response of Two Layers Stacked Packaging Units of Computers

WANG Zhiwei1，2，3, QI Debin1，2，3   

  1. 1. Packaging Engineering Institute， Jinan University， Zhuhai 519070;
    2. Key Laboratory of Product Packaging and Logistics of Guangdong Higher Education Institutes， Jinan University， Zhuhai 519070;
    3. Zhuhai Key Laboratory of Product Packaging and Logistics， Jinan University， Zhuhai 519070
  • Online:2017-02-05 Published:2017-02-05

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摘要：

通过正弦扫频和随机振动试验，研究了不同输入加速度谱谱型、不同振动等级和不同预压力条件下两层计算机堆码包装的动力学响应规律，采用加速度传感器和I-Scan系统分别测取产品的加速度响应和纸箱间的动压力响应。正弦扫频结果表明，预压力对堆码系统的共振频率、计算机共振加速度响应和纸箱动压比峰值均有明显影响。随机振动试验结果表明：上层计算机的加速度功率谱主要受一阶共振频率控制，下层计算机的加速度功率谱受一阶和二阶共振频率共同控制，上层计算机在一阶共振区域的加速度响应比下层计算机要大得多;堆码包装系统产品响应主要受制于系统共振区域的激励谱谱值，而非共振区域的激励能量对其影响很小;纸箱动压力功率谱主要受一阶共振频率控制，纸箱动压力的力水平穿越分布为Weibull分布;增大堆码预压力可有效抑制纸箱侧向运动，同时会使纸箱经历一个更大、更宽的力水平。

关键词: 动力学响应, 功率谱, 力水平穿越, 随机振动, 堆码包装

Abstract:

By using sine sweep and random vibration experiments, the dynamic response of two layers stacked packaging units of computers is investigated with different input acceleration spectral shapes, different input intensities of acceleration power spectral density (PSD) and different constraints. Acceleration sensors and I-scan system are respectively used to measure the acceleration response of computers and the dynamic force between the stacked boxes. The sine sweep experiment results show that the resonance frequency, resonance acceleration response of computer and peak of dynamic pressure ratio between boxes are obviously influenced by the constraint to stacked packaging units. The random vibration experiment results show that the acceleration PSD of the upper computer is mainly controlled by the first resonance frequency, and the acceleration PSD of the lower computer controlled together by the first and second resonance frequencies. The acceleration response of the upper computer in the first resonance region is much bigger than that of the lower computer; The product response of stacked packaging units is mainly subject to the excitation PSD in the resonance region, rather than that in the non-resonance region; The dynamic pressure PSD between boxes is mainly controlled by the first resonance frequency. The probability density function of force level-crossing between contact surfaces is of Weibull distribution; Strengthening the constraint to stacked packaging units can effectively suppress the pitch motions of boxes, and will make the boxes undergo a larger and broader force levels.

Key words: dynamic response, force level-crossing, power spectral density, random vibration, stacked packaging units

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