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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