Building Expression

Altair Forum User

hello everybody

i am doing an optimization study of an energy absorbing thinwalled structure.

what i want is to maximize is the specific energy absorbtion.

but i am having problem building an expression for it.

like

SEA=Energy absorbed divided by mass of the model

i can calculate the mass in hypermesh but

how do we define the mass of the model in hyperstudy to build the expression

also another case is

i want to maximize the crush force efficiency

efficiency= average force divided by peak force

i can get the data of the average force from the hyperview and hypergraph

but how do i define it while building the expression in hyperstudy?

please help me out...

Sharad

Altair Forum User

Hi Sharad,

What is the solver you use? What are the output files?

Usually HyperStudy reads the file to extract responses, like mass, forces, etc.

Do you mind sharing me the output files? My email is limin.xu@altair.com.cn

Thanks!

Limin

Software QA, HyperStudy

Altair Forum User

hello everybody

i am doing an optimization study of an energy absorbing thinwalled structure.

what i want is to maximize is the specific energy absorbtion.

but i am having problem building an expression for it.

like

SEA=Energy absorbed divided by mass of the model

i can calculate the mass in hypermesh but

how do we define the mass of the model in hyperstudy to build the expression

also another case is

i want to maximize the crush force efficiency

efficiency= average force divided by peak force

i can get the data of the average force from the hyperview and hypergraph

but how do i define it while building the expression in hyperstudy?

please help me out...

Sharad

You could define some 'time history' cards through the HyperCrash. Then it is easy to obtain lots of data from the .T01 files.