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contents:
Engl
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 2.6.1. Group of the
FE with the phase shift equal to zero
Let's admit, we have united in group
At us the closed mechanical system
consisting of a massive body (case) will turn out
If the beginning of a running cycle at all the FE entering into group, coincides, i.e. phase shift at all the FE is equal to zero for a running cycle all mechanical system will move on distance (according to (24) and (32)):
,
where:
After end of a running cycle each FE is necessary for resulting again in an initial condition, i.e. to make the actions listed in the beginning of item 2.5. { 2.5} Fig. 16
The
plot of moving of similar system is presented in a
Fig. 16.
Intervals of time
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2. 
of
force elements. 
and groups of the FE, total mass during the moment
,
equal: 
on the plot define time of restoration of
group of the FE in an initial condition.