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Hello, My problem is the following: I have to simulate the frequency response function of system consisting of a prosthesis pushed into a bone like structure. I've got several questions regarding to modal analysis and pin insertion problems 1. Is it possible in Ansys to use the outcome of a...

Hello, My problem is the following: I have to simulate the frequencu response function of system consisting of a prosthesis pushed into a bone like structure. I've got several questions regarding to modal analysis and pin insertion problems 1. Is it possible in Marc to use the outcome of a...

Hello everybody, I'm new to Marc! To train myself I am looking for some useful tutorials on dynamic analysis. Can somebody help me out here? thanks in advance, Jeroen

Hi, thanks for the reaction Alex. My problem consists of the dynamic verification of a milling machine. Can you give me some more specific information about how to use these combin elements? thanks in advance, Jeroen

Hi, I want to add damping to my model to do a modal analysis. After reading the help files several times and lots of unsuccesful attempt, I need more to the point information. 1. The damping solver doesn't support the constant damping when added to the material model. I want to simulate...

Hi, by importing an assembly CAD file, Ansys recognizes the different volumes. I need to connect these volumes to perform a modal analysis on it. By doing this, I want to take into account the physical properties of the connection (bolt, guideway,...). Can anybody tell me what's the easiest way...

Hi, for my internship, I'm verifying the static and dynamic behavior of a milling machine. I was wondering what the influence of stress can be on the dynamic behavior. I'd say that a system under stress has higher natural frequencies. In this way, one could stress up a structure to avoid that...

Hi, I was wondering: what's the influence of stress on the natural frequencies of a structure. I tried it for my model and I only notice a very small difference in results (0.1 Hz). This seams a bit low in my opinion. Can anybody help me out here? Jeroen

Hi again, I have to find the dynamical behavior of a milling machine. Connexions between the different parts are very important and I want to modelise them as realistic as possible. The structures has a couple of bolt connexions. I use the contact wizard to define the connexion. I would like...

Hi, I was wondering: what is the advantage of using shell elements if the volume can also be meshed with solid elements. Does this affect CPU time? thanks, Jeroen

Hi, thank you very much cbrn!!!! I'm on the roll now:) I manage to find natural frequencies of the system. I use the SIGNIF command like you proposed before. One thing I still don't understand though is the 'Spectral value versus frequency curve'. I don't get what it represents. I just use the...

Oh yeah, what does a participation factor represents in fact? I thaught it was the participation of the mode in the total vibration of the system. This implies however that the sum of all the participation factors has to be one and that a participation factor has to be greater than 0. However...

Hi, thanx again cbrn! I'm trying to figure it out. One more thing though, - what's the physical meaning of a negative participation factor? - what are the residual masses? thanks in advance, Jeroen

And a few other things, 1. what's the physical meaning of a negative participation factor? 2. what's the effective mass (outputted next to part.factor)? 3. I hope you have to give frequencies in Hz (cycles/s) in Ansys and not in rad/s? Thank you!!!! Jeroen

Hi, thx for the reaction cbrn. Now, I thaught about adding damping to the system to suppress the less important natural frequencies. I use the damped method with SOLID 187 elements. However I don't manage to find a way to define how much damping I want to add. When I change the value of the...

Hello everybody, I am a first time ansys user, charged with the job to find the natural frequencies and modes of a milling machine. However, I've got a few problems with the results I get. first problem: 1. I do a modal analysis in the domain 20-200Hz with Power dynamics or Block Lanzcos...