tangye2010_hit 发表于 2011-3-16 19:32:06

装备图进行模态分析

哪位高人知道一个具有多零件组成的系统进行模态分析应该注意什么?

ywh362568 发表于 2011-3-16 20:59:38

多少自由度?

sunnygu 发表于 2011-3-16 21:36:54

there is an example for modal analysis of assembly. No special issue, maybe contact pair.

heshang228 发表于 2011-3-17 14:13:35

3# sunnygu

Where is the example?

sunnygu 发表于 2011-3-18 03:28:38

Abstract (Question)

How the modal analysis with contact is carried out.
Description (Answer)

In modal analysis, contact tyings are detected as usual and they are applied to the stiffness and mass matrices. This is similar to how other MPC (servo-links, etc) and SPC (fixed boundary conditions) are applied.

The eigen value calculations are then made with the tied matrices and the tied eigen-vectors and eigenvalues are calculated.

sunnygu 发表于 2011-3-18 03:30:33

Abstract (Question)

How touching contact works in a modal analysis. Touching Contact Model shows different results from Glue Contact Model and No Contact Model. If Touching Contact Model acts like Glue Contact Model, the results have to be same. Or if Touching Contact Model acts like No Contact Model, the results have to be also same. But three models show all different results.
Description (Answer)

The difference among the 3 models are that glued contact has both normal and tangential links between two bodies, touching contact has only normal link between two bodies, and no contact model doesn't have any link between two bodies. Since normal modes analysis is actually a linear analysis, the initial contact status is kept in the modal analysis. The nonlinear nature of touching contact cannot be take into account in a modal analysis. It is necessary to setup initial contact table in glued contact case. Otherwise touching contact will be assumed without a contact table.

sunnygu 发表于 2011-3-18 04:07:51

by nx nastran

SCBJ 发表于 2011-5-26 23:55:22

很精辟 6# sunnygu

bao_tiantian 发表于 2011-5-27 07:49:54

呵呵,好东西,收藏了!

ligog008 发表于 2011-5-29 11:41:11

呵呵,好东西,收藏了!

ligog008 发表于 2011-5-29 16:14:36

谢谢,太需要了

oliver123 发表于 2011-5-29 20:56:38

好啊!。。。

cesc315 发表于 2011-5-30 21:58:23

谢谢斑竹 。。

turbinesv 发表于 2011-5-31 00:19:03

斑竹在6楼的讲解非常到位,学习了。

ahua326 发表于 2011-6-6 19:42:27

不知道做模态分析能不能耦合自由度

sim_we 发表于 2013-3-27 13:27:24

sunnygu 发表于 2011-3-18 03:30 static/image/common/back.gif
Abstract (Question)

How touching contact works in a modal analysis. Touching Contact Model shows di ...

It is necessary to setup initial contact table in glued contact case. Otherwise touching contact will be assumed without a contact table.这句话什么意思?
是不是Touching接触在103正则模态分析中不可用?还是怎么回事?

hhhppp 发表于 2013-6-30 14:00:21

好贴!!!!!!!!!!!!

liuzijia0531 发表于 2015-3-6 14:52:07

那MSC Nastran能不能进行带接触(touch)的模态分析呢

zhuxiaofei603 发表于 2015-6-15 21:17:59

·····················

soungch 发表于 2015-7-30 10:08:05

好贴,在模拟振动台振动的时候可以参考。
页: [1] 2
查看完整版本: 装备图进行模态分析