摘要
通过建立振动台、夹具和橡胶隔振试件整体有限元模型,对橡胶隔振试件振动台随机振动试验进行了仿真研究。仿真过程发现薄壳结构和橡胶隔振器在几百赫兹以上中高频段响应存在严重的衰减现象。通过研究发现动刚度在中高频段的非线性特性是影响响应衰减的主要因素。结合真实试验结果,对薄壳结构和橡胶隔振器的中高频动刚度进行了修正,修正结果表明薄壳结构和橡胶隔振器动刚度随频率增加而增大,获得了其动刚度随频率的变化趋势曲线。修正后的仿真结果整个频段内与实验结果基本一致,解决了仿真过程中高频段响应衰减问题。
Random vibration test simulation for a specimen with vibration-isolating rubber was carried out based on the integrated finite element model of a vibration table,a clamping jig and a specimen.Obvious attenuation phenomena of responses in mid and high frequency areas over several hundred Hertz were found for a thin shell and a rubber isolator in simulation.Further investigations indicated that nonlinearity of dynamic stiffness in the mid and high frequency areas was the main factor affecting the response attenuation.Then the dynamic stiffness of the thin shell and the rubber isolator was updated combining with real test results. The updated results showed that dynamic stiffness of the thin shell and the rubber isolator was enhanced with increase in frequencies,the trend curve was described with graphs.Based on the updated dynamic stiffness,the response attenuation problem was solved and the simulated results were in accordance with the real test ones.
出处
《振动与冲击》
EI
CSCD
北大核心
2009年第1期174-176,共3页
Journal of Vibration and Shock
基金
973国家安全重大基础资助项目(*****020103)
关键词
非线性
橡胶隔振
动刚度
随机振动实验
有限元仿真
nonlinearity
vibration-isolating rubber
dynamic stiffness
random vibration test
finite element simulation
