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(7.19)
Expression (7.19) is the same for any conditions on the
edges of the beam. Can change only the absolute values y and
д
y .
c
Having solved equation (7.19) with respect to y , we
д
obtain

y  k y , (7.20)
д д c
where y – beam deflection under static loading of (fig
c
7.4, b); k - dynamic cross impact
д

2h
k  1 1 . (7.21)
д
y
c
7.2.4 Twisting impact

Let on the BC through crank shaft AB the shock load is
transmitted (fig. 7.5). In this case, the shear stress at the points of
the shaft is determined by the
formula
  k  ,
д д c
(7.22)

where k  1 1 2h  –
д c
dynamic coefficient;  –
c
moving point singing effort
Figure 7.5 toward hitting under
statically applied force P .
Considering only the torsion shaft and considering that crank
quite hard, we have
   R ,
c
where  – angle of twist the end of the shaft under torque
M  PR .
x
Often caused by torsional shock loads are not falling, and
the forces of inertia masses rotating with great acceleration at the

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