Comparison between Webshaker and SDOF Model using Sinusoidal Input

About this Experiment:
This experiment compares data from the live Webshaker experiment to the result of the Single Degree of Freedom (SDOF) equation computer program.

The default natural frequency in the SDOF program is 4 Hz and its damping ratio is 0.025. After the initial Webshaker experiment, users can adjust the natural frequency and damping ratio supplied to the SDOF program so as to achieve a better match with the Webshaker experiment.

The experiment uses a sinusoidal input as the base acceleration motion to the test structure during the experiment. The acceleration data for the sinusoidal input is converted to a voltage signal which is sent to the shake-table delivering the base motion to the test-structure.

To construct a sine wave, enter values for the amplitude and frequency of the wave as well as the duration (time) and then press the "Run" button.  Limits are placed on the inputs in order to ensure that neither the shake table nor the model become damaged.

Input for SDOF Program:

Natural frequency (Hz) (fn > 0)   *
Damping ratio (0 ≤ ζ1 ≤ 1)   *

Input for Webshaker:

Webshaker input amplitude (V) (from 0. to 0.2)   *
Webshaker input frequency (Hz) (from 0.5 to 20)   *
Webshaker shaking time (s) (≤ 30 seconds)   *
Free vibration time (s) (from 0 to 20)   *