6 Replies Latest reply on May 5, 2014 12:49 AM by Jared Conway

    Drop test with Nonlinear Material

    Zhemin CAI

      Hi All:

       

      I am trying to simulate a 4inch drop for our product. The module layout is shown in the attached picture.

       

      Three rubber pads are used in the module to absorb the contact shock.

      As a result, the linear drop test cannot give me an accurate predication.

       

      I have two questions for this nonlinear simulation:

       

      1. How to model the ground for the object to hit. It should be similar to the

          "virtual wall" option in static analysis but the nonlinear package doesn't provide this option.

       

      2. How to calculate the Rayleigh damping coefficient for this system.

          I understand I should calculate these values according to the system natural frequency.

      However, I should calculate the natural frequency of the drop piece only or the drop piece with  

      ground?

       

      Can anyone give me some suggestions on these questions?

       

      Thanks a lot.

      Zhemin