🎉Community Raffle - Win $25

An exclusive raffle opportunity for active members like you! Complete your profile, answer questions and get your first accepted badge to enter the raffle.

Join and Win

Modal Frequencies

Altair Forum User

When i do modal analysis, the first few modes are in small number e.g 3,4,5 etc.. and quickly jumps to a higher number, if this is the case, can i skip the first few modes and optimze the object for the first highest frequency?

I have attached a picture for reference. Thank You in advance.

For the below case, in the first 3 modes, the mode shapes are not significant.

<?xml version="1.0" encoding="UTF-8"?>

Find more posts tagged with

English

OptiStruct

Accepted answers

All comments

Rahul Rajan_21763

As far as frequency is increasing no need to worry.From OptiStruct please refer frequency & weighted freq card to maximize frequencies. PFA screenshot from help.

For optimization specific queries i am moving this topic to OptiStruct.

<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi @Sarujan,

I worked on your model last Friday. Since the first few modes are very less I tried constraining other modes and had some results. I will share the results with you soon

Altair Forum User

Thank you all for your help, this is much appreciated.