Hi,
I was making an eigenfrequency analyse of electric motor housing including several rotor and stator parts. Since I am using a solidworks livelink the construction is a bit more complicated yet meshable without any bigger problems.
I was doing benchmark testing with modal analyses made in ansys (the correct results were made at fisrt there) thenI tried to repeat the analysis in comsol. At first I made analyses of individual parts, which resulted in exactly the same eigenmodes with small deviation in frequencies.
The problem and huge deviation in frequencies and modes start when I try to analyse the assembly in comsol. The only possible way to obtain comparable results is to form a union wafter importing the model... If I import the model and form assembly with identity pairs and define rigid contacts with these pairs I would expect the same results as when forming a union with the whole assembly. Doesn't this seem reasonal?
I also tried contact pair but after viewing the documentation and several tutorials I believe this option isn't suitable for my case.
So my question is, am I understanding contacts wrong or is a rigid connection of an identity pair the same as u union form of an assembly? Based on the results I would guess not, however it's bit strange as ansys automatically transfers every contact into a rigid one, which is anyhow necessary for an eigenfrequency analysis.
P.S. I wanted to do a modal analysis using formed assembly as meshing was much easier to achieve with lower numbers of elements and most imoprtantly no errors while building it.
Thanky for the answers...
--
Kind regards,
Matej
I was making an eigenfrequency analyse of electric motor housing including several rotor and stator parts. Since I am using a solidworks livelink the construction is a bit more complicated yet meshable without any bigger problems.
I was doing benchmark testing with modal analyses made in ansys (the correct results were made at fisrt there) thenI tried to repeat the analysis in comsol. At first I made analyses of individual parts, which resulted in exactly the same eigenmodes with small deviation in frequencies.
The problem and huge deviation in frequencies and modes start when I try to analyse the assembly in comsol. The only possible way to obtain comparable results is to form a union wafter importing the model... If I import the model and form assembly with identity pairs and define rigid contacts with these pairs I would expect the same results as when forming a union with the whole assembly. Doesn't this seem reasonal?
I also tried contact pair but after viewing the documentation and several tutorials I believe this option isn't suitable for my case.
So my question is, am I understanding contacts wrong or is a rigid connection of an identity pair the same as u union form of an assembly? Based on the results I would guess not, however it's bit strange as ansys automatically transfers every contact into a rigid one, which is anyhow necessary for an eigenfrequency analysis.
P.S. I wanted to do a modal analysis using formed assembly as meshing was much easier to achieve with lower numbers of elements and most imoprtantly no errors while building it.
Thanky for the answers...
--
Kind regards,
Matej