Free body analysis
Free body analysis
(OP)
Is it good practice to model body that have constraint as a free body for resonance analysis?
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RE: Free body analysis
another day in paradise, or is paradise one day closer ?
RE: Free body analysis
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Free body analysis
E.g. Cantilever beam(System) that is fix-free beam have different mode shapes and natural frequencies than only beam(Body) with no support that is free-free beam. Here the fixity of one end increases the stiffness of beam and give different mode shapes and natural frequencies than free-free beam.
RE: Free body analysis
For double points, why does the first /flexural/ mode of a beam drop in frequency when pinned at each end, compared with the free-free result?
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Free body analysis
I am not getting your point here or OP's question. Could you explain your point with more information?
Pin-Pin beam is allowed to rotate only in the axis normal to depth of beam keeping all other movements fixed. How is the frequency of Pin-Pin beam will be lower than the free-free beam? Free-free beam will have near zero frequency with random mode shapes which is not at all comparable to pin-pin beam which have frequency of positive number and mode shape across/along the flexural direction.
RE: Free body analysis
Cheers
Greg Locock
New here? Try reading these, they might help FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm?
RE: Free body analysis
http://web.mit.edu/2.75/fundamentals/FUNdaMENTALs%...
in beam fixing one end of the beam reduce the natural frequency compare to free-free beam
RE: Free body analysis
Maybe I need to understand what is double point that you mentioned.
Maybe I need to understand more about mathematical assumption of sinusoidal waveform of natural vibration which prove that free-free beam have high frequency than pin-pin beam except translation modes and zero frequency of free-free beam and Clamp-Clamp beam have same frequency as that of free-free beam.
But what about the actual scenario?