Grass cutting motor- shock load analysis

- May 30, 2022 at 11:48 am
  
  kar.engg
  Subscriber
  
  I am performing a shock load analysis for a motor that is used in the application of grass cutting process.
  Load input given by customer : 1) 14010 lb @ 0.1 ms (total time duration = 0ms to 0.5 ms), 2) 3150 rpm.
  A) I tried with 1st input applied at blade tip , in transient structural analysis in Workbench. The peak stress came not at 0.1 ms (where load input is at its peak) but at 0.4 ms. Why?
  B) I tried with 2nd input applied at motor shaf, in explicit dynamics analysis in Workbench. Also now, I modeled a stone with 0.2 mm gap from blade. Is the gap distant significant in explicit dynamics analysis? Can stone be replaced with just fixed support at blade, opposing the rotation direction?
  Karthik
- May 31, 2022 at 12:22 pm
  
  Ram Gopisetti
  Ansys Employee
  
  whats the shock profile ?, In general, for any given shock analysis you need an loaidng profile and it usiually an half sine or full sine with an peak time of load and end time. the gap is significant if the contact is exsisiting and is a bonded and in your case i guess it not. but why switiching from transient to explcit any specific reason?, yes you can replace an stoping force with an fixed boundary.
  Cheers, Ram

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