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首页> 外文期刊>IEEE Transactions on Components, Packaging, and Manufacturing Technology. Part B, Advanced Packaging >Dynamic response of a rectangular plate to a shock load, withapplication to portable electronic products
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Dynamic response of a rectangular plate to a shock load, withapplication to portable electronic products

机译：矩形板对冲击载荷的动态响应，应用于便携式电子产品

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摘要

The ability to predict and possibly minimize the adverse consequences of dynamic loading on electronic equipment is especially important for portable electronic products, both because they can be easily dropped and because the minimum displacement (stopping distance) in such products, when subjected to shock loads, has to be made very short. This leads to high accelerations and, as a consequence of that, to elevated dynamic stresses, and can possibly result in failures of vulnerable elements. In this analysis, we examine the dynamic response of an element having a shape of a rectangular plate (e.g., liquid crystal display), and packaged in a “double box” system, (e.g., a chassis and a cabinet). The analysis is carried out, assuming that the outer box (cabinet) does not rebound. The purpose of the analysis is to evaluate the effect of the masses (weights) of the element itself and the inner box (chassis), as wed as the effect of the spring constants of the cushionings, on the maximum displacement and the maximum acceleration of the plate's support contour. On the basis of the performed analysis, we developed engineering guidelines for the preliminary selection of the spring constants of the cushionings, so that not to compromise the dynamic stability of the package, e.g., to keep the induced displacements and accelerations at a sufficiently low level. We show that this stability can be ensured by designing the package in such a way that the lower natural frequency of vibrations of the two-degree-of-freedom dynamic system in question (plate/chassis assembly) differs considerably from its higher frequency. For the given masses of the plate element and the inner box (chassis), this can be achieved by making the inner cushioning (gasket) substantially stiffer than the outer one (grommet). We show also that the strength of the plate element can be improved, if it is made thick enough and is clamped by the support contour. Finally, we demonstrate that a probabilistic approach can be successfully applied to design a package with a low probability of failure
机译：对于便携式电子产品，预测并可能最小化电子设备上动态负载的不利后果的能力尤其重要，这既是因为它们很容易掉落，又是因为此类产品在承受冲击载荷时的最小位移（停止距离），必须做得很短。这会导致较高的加速度，并因此导致较高的动态应力，并可能导致易损元件失效。在该分析中，我们检查了具有矩形板形状的元件（例如液晶显示器）的动态响应，并包装在“双箱”系统（例如底盘和机柜）中。假设外箱（柜）不反弹，则进行分析。分析的目的是评估元件本身和内箱（底盘）的质量（重量），以及减震器弹簧常数的影响，对最大位移和最大加速度的影响。板的支撑轮廓。在进行的分析的基础上，我们为缓冲垫的弹簧常数的初步选择制定了工程指导原则，以免损害包装的动态稳定性，例如，将产生的位移和加速度保持在足够低的水平。我们表明，通过以以下方式设计包装可以确保这种稳定性：所讨论的两自由度动态系统（板/机箱组合件）的较低固有振动频率与其较高频率有很大不同。对于给定质量的板状元件和内盒（底盘），可以通过使内垫（垫圈）比外垫（垫圈）更硬来实现。我们还表明，如果将板件制成足够厚并被支撑轮廓夹紧，则可以提高板件的强度。最后，我们证明了概率方法可以成功地用于设计失败概率低的包装

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