Hello Guys, I am working with a non-linear material(paper) and would like to simulate it ,and take the FRF's. I am not able to obtain the same frequency experimentally and by simulation. Simulation frequecy is very low (0.000467 hz) and experimentally i am getting something around 50 hz. Please tell me what would be a better Idea, also i am working with I-DEAS. My specimen is a single layered food packing material claped at both the ends(12 mm by 650 mm). Mirza