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difference between selected base excitation and uniform base excitation?

Question asked by Lingesh Sangur on May 12, 2017

i was running a shock analysis for a pump. when used uniform base excitation problem resulting stress was unpracticle, showing 4500MPa and stress distribution was NOT uniform. Now changing load from uniform to selected base excitation keeping everything else same gives fine result. What s the difference between these two methods?

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