1 Reply Latest reply on Aug 25, 2011 3:39 AM by Loic Ancian

    Simulation of a Person or Object Falling onto a Structure???

    Albert James

      I’m interested in doing some type (TBD) of analysis to simulate the effects, as noted below.  I need some “Technical Advice” on how to setup and what type of analysis within Simulation-Premium can be used to evaluate the effect of a person or object falling on top of a structure from a given height, as defined at the start of this email message.

       

      Please read from the beginning and give me some quick technical advice on this subject.

       

      Thanks,

      Al James

      Principal Mechanical Engineer

      Simulation & Validation Testing

      Ambient Corporation

      7 Wells Avenue, Suite #11

      Newton, MA 02459

      Ph     617-614-6756

      Fax   617-332-0024

      1. al.james@ambientcorp.com

      -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

      Personal fall arrest systems must:

      a)         Be rigged so that if an employee falls, it is the shortest possible distance so as to minimize the impact and swing of the arrest. The absolute maximum free fall distance is six feet.

      b)         Limit maximum arresting force on an employee to 1800 pounds with a body harness.

      c)         Bring the employee to a complete stop and limit maximum deceleration distance to 3.5 feet.

      d)         Have sufficient strength to withstand two times the potential impact energy of an employee free-falling a distance of six feet, or the free-fall distance permitted by the system, whichever is used.


        • Re: Simulation of a Person or Object Falling onto a Structure???
          Loic Ancian

          Hello

          I did something similar in the past. I had to take into account an impact of 40joules on a component.

          By hand I got 40=1/2 m V² .... so for instance a mass of 8Kg at speed of 2.73m/s

           

          Then in sim premium I used a Non Linear Dynamic simulation.

           

          If I remember well one can define an initial velocity to a part. Make sure that mass is correct and that time step is small enough..

           

          then a no penetration contact and that's it...:)

           

           

          But this kind of computation is veeeery long, and sw simulation is not very efficient with this kind of simulation. It took me ages before getting something correct...many bugs and crashes.

           

          Loïc