悬臂梁易损部件在矩形加速度脉冲激励下的动力学响应与有限元分析

发布时间：2018-05-17 22:12

本文选题：悬臂梁 + 易损件　；参考：《振动与冲击》2016年05期

【摘要】：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 the vibration response of vulnerable parts of cantilever beam under rectangular pulse excitation, an approximate analytical solution of the dynamic stress of cantilever beam at the end of the cantilever is derived, and the relationship between the maximum stress and the peak value of rectangular pulse is obtained. The results show that the maximum stress increases with the increase of the amplitude of the acceleration pulse, but it is infinitely close to the limit value when the velocity change is constant. Finally, the finite element model of the damaged part-mass subject under rectangular pulse excitation is established, and compared with the analytical solution, it is found that the stress response of the cantilever beam can be obtained by using the second order vibration mode. The research results provide a theoretical basis for the protection of cantilever beam-type breakable parts under the action of honeycomb paperboard cushioning.
【作者单位】：浙江大学宁波理工学院;
【基金】：国家自然科学基金(11402232) 宁波市自然科学基金(2015A610092);宁波市自然科学基金(2015A610100;2013A610135) 浙江省自然科学基金(LY16A020004)
【分类号】：O327

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