为分析悬臂梁易损部件在矩形脉冲激励下的振动响应，推导出悬臂梁在悬臂端处动态应力的近似解析解，得到最大应力与矩形脉冲峰值之间的关系，分析结果表明：在速度变化量一定时，最大应力随加速度脉冲幅值的增加而增加，但会无限逼近极限值。最后建立了易损件-质量主体在矩形脉冲激励下的有限元模型，并与解析解进行了对比，发现运用2阶振动模态即可得到精确的悬臂梁的应力响应，所取得的研究成果为具有悬臂梁式易损件在蜂窝纸板缓冲作用下的防护提供理论基础。
Abstract
In order to analyze dynamic stress response of cantilever beam under the excitation of rectangular acceleration pulse, relationship between maximum stress at the cantilevered end and rectangular acceleration pulse amplitude was deduced, which shows that the maximum stress increases with increasing of the acceleration amplitude but approaches the limit given the velocity change for acceleration pulse is constant. Finally, analytical method was verified by finite element results, meanwhile 2-order vibration modes are enough to give a good estimation for the stress response of cantilever, which can provide theoretical foundation for the electronic product with cantilever beam type when honeycomb paperboard used as cushioning material.
关键词
悬臂梁 /
易损件 /
有限元 /
加速度脉冲
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Key words
Cantilever beam /
critical component /
finite element model /
acceleration pulse
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参考文献
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