1.6 Dynamic Loading
9
Fig. 1.5 Multiple degrees of freedom system
Fig. 1.6 A continuous
system
the load is same in each cycle. The simplest periodic loading is a simple harmonic
motion. For the rotor, the reciprocating engine and the ship of Fig. 1.7, the dynamic
load is periodic. The form of periodic loading varies from simple sine or cosine
curves to more complex shapes. The bridge, the frame, the offshore tower and the
building of Fig. 1.7 are subjected to non-periodic loading.
Again, the form of the loading for these cases varies. The blast loading of Fig. 1.7e
is of short duration, whereas the wave and earthquake loading of Fig. 1.7f and g