Geology Reference
In-Depth Information
Figure 8. Seismic input excitation: N. Palm Springs (Frequency content upto 30 Hz)
a DSP-based, real-time controller manufactured
by dSPACE. As noted earlier the FLC is encoded
in MATLAB Simulink using real time workshop
(RTW) interface and dSPACE hardware and
software. The base plate acceleration at the
damper location and pseudo velocity (obtained
by integrating acceleration data in real time) are
used as a feedback to the RTW to decide on the
voltage required by the MR damper based on
encoded FLC algorithm.
Figure 9 shows the isolator displacement and
acceleration for both experimental and numerical
results. The peak isolator relative displacement is
found to be 0.1615m, where as the analytically
obtained maximum isolator drift is 0.1339m. This
shows a good match between the analytically and
experimentally obtained results. A phase shift
is observed between the experimental and the
analytical results. This is due to the shake table
dynamics that has introduced a phase lag between
the original seismic displacement data and the
data obtained as an output from the shake table.
Figure 10 shows the floor inter-storey drift
and acceleration response of the base isolated
Figure 9. Isolator responses of simple base isolated building (N. Palm Springs)
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