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Showing results for tags 'nlfe'.
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Hi, I am trying to simulate a flexible inverted pendulum on a cart. I have a Matlab simulation that I am trying to verify and compare with the MotionSolve simulation. I am so far attempting to do this in three ways: Using a flexible approximation of the pendulum with FEM. For this I made a FEM mesh of the type of beam that I am using (cylindrical beam). However, this method makes the center of mass differ from the rigid center of mass, which gives unwanted vibrations, affecting the accuraccy of the simulation. Using a 1D beam approximation in HyperMesh to create the FEM. This also has some problems, as the response differs a lot from expectations, since the beam does not contain the slope at the beginning and end of the beam elements as a degree of freedom. Finally, I am trying to use an NLFE beam. This one seems to really be an exact match for my model. However, I am trying to verify it by running a co-simulation. But this co-simulation keeps generating the following error: ERROR: Failure obtaining VARVAL in user sub SYSFNC! ERROR: Error from initialization of user subroutine! This error does not occur if I use co-simulation with the same in- and output definitions, but with a Flexbody. I am therefore wondering if it is possible to use co-simulation together with NLFE beam elements. Thanks in advance! If you need more information, or require any of the files I am using, let me know. Kind regards, Luuk Zwaans
Hello, I am developing a Vibration set that simulates a free 4 degree of freedom system using beams as the spring element. I am an inexperienced user and am trying to make a dynamic simulation of the system. This simulation should give me the position of each mass by the time the set vibrates. It would be nice to have some other data as natural frequencies and mode shapes as well. I was trying at first to use flexbodies to simulate the spring beams, but I couldn't figure out how to have initial displacement as the input of the system. With the calculated force to move it to the initial displacement position, I couldn't use the force only for one second an than having a vibration response. What do you suggest as a method for me to simulate these? Should I try it with NLFE? dispsfix.hm I appreciate any help given! disp.stp dispsfix.hm
Hi sir, I am trying modeling belt as nlfe but solution does not converge. Could you make any suggestion for convergence especially for the belt friction and other nonlinear parameters. It is not possible to learn exact friction parameters for belt but I guess you have some approximations for the nonlinear parameters. Please find the all necessary files for the model at the attachment. Additionaly, I am trying to measure belt flapping. Krank_NR_Angular_Velocity_6.txt NLFE.mdl NLFE.xml