idlewind 发表于 2013-2-27 09:32

请教随机振动分析的问题

将一个机箱放于振动圆台上,振动台的振动频率在20-2000HZ间。输入随机振动PSD加速度。现在想要知道机箱在振动下的应力应变等响应结果。
我想首先要进行模态分析,得出20-2000HZ下的模态。然后进行随机振动分析。请问:
1. 模态分析时,一般需要多少个模态结果。
2. 边界条件如何选取,是否要固定振动圆台的底表面。
3. 输入20-2000HZ的PSD加速度曲线,频率增量如何选取,通常间隔是多少HZ,还是程序本身选定的。
另外如果有人能够用workbench做这个项目或者告诉我详细的分析步骤,我愿意付一定的报酬。请联系我:meconsults@gmail.com
多谢。
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

小迷糊piglet 发表于 2014-3-19 20:19

1,输出模态大约为输入PSD加速度曲线的频率上限的1.5倍,即输出3000Hz内的所有模态。
2,个人认为需要固定振动圆台的底表面
3,计算的频率增量是由程序决定的,无法进行指定

xiaogengniu 发表于 2014-3-19 21:10

1. 模态分析时,一般需要多少个模态结果。---------这个根据分析的对象而定,个人认为前三个就够了。
3. 输入20-2000HZ的PSD加速度曲线,频率增量如何选取,通常间隔是多少HZ,还是程序本身选定的。--------在实测中,频率增量与时间间隔这些与硬件有关,也就是与缓冲区的大小分辨率等有关。
用workbench 相对容易,理论分析而已,实测中较复杂。
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