Vibration of Fixing Device of the Reaction …
379
Fig. 5 Eigenmodes of vibration of the whole chamber (modes 15, 19, 20)
an analysis of the transmissibility of displacement of the ground to the target fixed
at the end of the clamping lever. To achieve this, we imposed a unit displacement
of the amplitude of the harmonic vibration of the ground and to study how big
the amplitude of the target vibrations, in this case, would be. The obtained graph
represents the transmissibility of the displacement (Fig. 6). This representation is
obtained in the following manner: the ground is excited with a unitary amplitude, for
different frequencies, from 0 to 5000 Hz. This excitation determines an amplitude of
the target having 13 units, for the frequency 800 Hz, or having 2 units for a frequency
490 Hz. Making this calculus for all the frequencies between 0 and 5.000 Hz, it is
possible to obtain Fig. 6. It can be seen that for some frequencies the magnitude of the
amplitude can increase even 13 times. So the vibrations of the interactive chamber’s
mount base amplify. In this case, there are two paths to follow: to avoid operating
in the vibration amplification area and redesign the target clamping device in such a
way that it becomes stiffer (Figs. 7, 8, 9, 10, 11 and 12).
Fig. 6 The lever with the target [1]
379
Fig. 5 Eigenmodes of vibration of the whole chamber (modes 15, 19, 20)
an analysis of the transmissibility of displacement of the ground to the target fixed
at the end of the clamping lever. To achieve this, we imposed a unit displacement
of the amplitude of the harmonic vibration of the ground and to study how big
the amplitude of the target vibrations, in this case, would be. The obtained graph
represents the transmissibility of the displacement (Fig. 6). This representation is
obtained in the following manner: the ground is excited with a unitary amplitude, for
different frequencies, from 0 to 5000 Hz. This excitation determines an amplitude of
the target having 13 units, for the frequency 800 Hz, or having 2 units for a frequency
490 Hz. Making this calculus for all the frequencies between 0 and 5.000 Hz, it is
possible to obtain Fig. 6. It can be seen that for some frequencies the magnitude of the
amplitude can increase even 13 times. So the vibrations of the interactive chamber’s
mount base amplify. In this case, there are two paths to follow: to avoid operating
in the vibration amplification area and redesign the target clamping device in such a
way that it becomes stiffer (Figs. 7, 8, 9, 10, 11 and 12).
Fig. 6 The lever with the target [1]